CN114316642A - High-temperature-resistant anti-corrosion silicate-based coating and preparation method and application method thereof - Google Patents
High-temperature-resistant anti-corrosion silicate-based coating and preparation method and application method thereof Download PDFInfo
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- CN114316642A CN114316642A CN202111588819.0A CN202111588819A CN114316642A CN 114316642 A CN114316642 A CN 114316642A CN 202111588819 A CN202111588819 A CN 202111588819A CN 114316642 A CN114316642 A CN 114316642A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 147
- 238000005260 corrosion Methods 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 48
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
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- 239000000945 filler Substances 0.000 claims abstract description 14
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 10
- 239000012153 distilled water Substances 0.000 claims description 8
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims description 7
- 239000004408 titanium dioxide Substances 0.000 claims description 7
- 239000004111 Potassium silicate Substances 0.000 claims description 6
- 239000004115 Sodium Silicate Substances 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 6
- 239000000706 filtrate Substances 0.000 claims description 6
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- 239000010445 mica Substances 0.000 claims description 6
- 229910052618 mica group Inorganic materials 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 6
- 235000019353 potassium silicate Nutrition 0.000 claims description 6
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical group [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 6
- 238000005488 sandblasting Methods 0.000 claims description 6
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 6
- 239000005995 Aluminium silicate Substances 0.000 claims description 5
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- 238000003618 dip coating Methods 0.000 claims description 5
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 5
- 230000001680 brushing effect Effects 0.000 claims description 4
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims description 4
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
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- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
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Abstract
The invention discloses a high-temperature-resistant anti-corrosion silicate-based coating as well as a preparation method and an application method thereof. The high-temperature-resistant anti-corrosion silicate-based coating comprises the following raw materials in parts by weight: 30-60 parts of liquid silicate, 5-15 parts of curing agent, 20-30 parts of high-temperature-resistant filler and 5-10 parts of extender filler. The coating has excellent high-temperature resistance and corrosion resistance, so that the technical problems of oxidation and corrosion of the heat-resistant steel member in a high-temperature corrosion environment can be effectively solved, and the service life of the heat-resistant steel member in the high-temperature corrosion environment can be reliably prolonged.
Description
Technical Field
The invention relates to a coating, in particular to a high-temperature-resistant and anti-corrosion silicate-based coating, a preparation method and an application method thereof, which are particularly suitable for carrying out high-temperature-resistant and anti-corrosion treatment on a heat-resistant steel member applied to an ultra-supercritical steam turbine set in a high-temperature corrosion environment.
Background
In an ultra-supercritical turbine steam turbine unit, a boiler and a steam turbine are important components, the environment temperature is higher, the corrosivity is stronger, and parts of the equipment are required to be formed by heat-resistant steel.
At present, the key materials applied to the ultra-supercritical steam turbine set mainly comprise martensite/ferrite heat-resistant steel, austenite heat-resistant steel and nickel-based high-temperature alloy. Among them, martensite/ferrite heat-resistant steel is a heat-resistant steel of 9% Cr and 12% Cr series, which is developed successively with the improvement of steam parameters, and the representative materials are T/P91, T/P92 and T122. However, the heat-resistant steel cannot meet the technical requirement of steam corrosion resistance, and the maximum service temperature of the heat-resistant steel does not exceed 620 ℃.
With the development of the ultra-supercritical power generation technology, the high-temperature corrosion of steam to metal materials is more serious due to the increase of the steam temperature of an ultra-supercritical turbine set, so that the technical requirements on high temperature resistance and corrosion resistance of the materials may exceed the technical requirements on creep rupture strength, and the corrosion resistance of ferrite heat-resistant steel at high temperature is particularly noticed. Research shows that the martensitic stainless steel can generate oxidation corrosion in a high-temperature steam environment, an oxidation layer is composed of a loose oxidation outer layer and a compact oxidation inner layer, and the higher the temperature is, the more the corrosion weight is increased, the defects of cracks and the like easily occur on the oxidation layer, and further the corrosion is aggravated. Therefore, the high temperature resistance and corrosion resistance of the novel ferrite/martensite heat-resistant steel should be fully considered when developing the novel ferrite/martensite heat-resistant steel.
Aiming at the problem of material failure of an ultra-supercritical steam turbine set, a novel oxidation-resistant alloy material is developed to solve the problem. However, the development of new refractory materials is costly, long-lasting, and requires engineering tests. At present, heat-resistant steel adopted in the field of ultra-supercritical power generation meets the requirements of mechanical performance, oxidation resistance and corrosion resistance by improving different chromium contents. However, the operation experience and theoretical research of the power station for more than 20 years shows that the service life of the traditional heat-resistant steel in the supercritical power station is far shorter than that of the subcritical power station, and the fundamental reasons are as follows: when the temperature is higher than 600 ℃, a chromium oxide film formed on the surface of the heat-resistant steel is more prone to peeling and volatilization in a supercritical water vapor environment, so that Cr alloy elements are rapidly consumed and catastrophic oxygen occurs.
The protective coating is coated on the surface of the heat-resistant steel, so that the technical measure for effectively solving the high-temperature oxidation and corrosion of the heat-resistant steel is also provided.
At present, the protective coating for the heat-resistant steel comprises a Ni-Cr, Fe-Cr and Co-Cr binary alloy coating, a Ni-Cr-Al, Fe-Cr-Al and other ternary alloy coating, and Cr3C2WC modified binary alloy composite coating, multi-element alloy composite coating, non-metal coating, shot blasting, metal surface diffusion modification and magnetron sputtering technologyPreparing metal covering layers, ceramic coatings and the like. However, the main technical problems with these coating or surface modification techniques are: require special production equipment; the coating of large and complex-shaped components cannot be realized; a subsequent heat treatment is required if necessary. Is not beneficial to effectively solving the technical problems of oxidation and corrosion of heat-resistant steel components applied to the ultra-supercritical steam turbine set in a high-temperature corrosion environment.
Therefore, in order to promote the development of the ultra-supercritical power generation technology and effectively solve the technical problems of oxidation and corrosion of heat-resistant steel components applied to the ultra-supercritical steam turbine unit in a high-temperature corrosion environment, it is necessary to develop a high-temperature-resistant and corrosion-resistant coating.
Disclosure of Invention
The technical purpose of the invention is as follows: aiming at the particularity and the development direction of the ultra-supercritical steam turbine set and the technical defects of the coating used by the existing heat-resistant steel, a high-temperature-resistant and anti-corrosion silicate-based coating capable of effectively solving the technical problems of oxidation and corrosion of the heat-resistant steel component in a high-temperature corrosion environment is independently developed, and a preparation method and an application method of the coating.
The technical purpose of the invention is realized by the following technical scheme that the high-temperature-resistant anti-corrosion silicate-based coating is composed of the following raw materials in parts by weight:
30-60 parts of liquid silicate,
5-15 parts of a curing agent,
20-30 parts of high-temperature resistant filler,
5-10 parts of an extender filler.
In a preferable embodiment, the viscosity of the dope is adjusted by distilled water, and the mass ratio of the distilled water to the total amount of the dope is 1: 10 to 20.
As one of the preferable embodiments, the liquid silicate is potassium silicate, sodium silicate or a mixture thereof.
Preferably, the curing agent is polymerized aluminum phosphate with the particle size of 2-30 mu m, polymerized zinc phosphate or a mixture thereof.
Preferably, the high-temperature resistant filler is alumina with the particle size of 1-20 mu m, titanium dioxide or a mixture of the alumina and the titanium dioxide.
Preferably, the extender filler is mica powder, kaolin powder or a mixture thereof with the particle size of 10-50 mu m.
The design idea of the technical measures is that the inorganic silicate has excellent heat resistance, normal-temperature curing is realized by polymerizing phosphate, the high-temperature resistance of the coating is improved by the high-temperature resistant filler, the compactness of the coating is improved by the extender filler, and the cost is reduced.
The coating prepared by the technical measures has excellent high-temperature resistance and corrosion resistance, so that the technical problems of oxidation and corrosion of the heat-resistant steel member in a high-temperature corrosion environment can be effectively solved, and the service life of the heat-resistant steel member in the high-temperature corrosion environment is reliably prolonged; in addition, the coating has better economical efficiency and is beneficial to industrialization. In particular, in the coating mechanism, liquid silicate of potassium silicate and/or sodium silicate is used as a film forming material of a coating, and the silicate has the advantages of excellent heat resistance, high temperature resistance, weather resistance, good bondability with metal and the like; the heat resistance of the coating is greatly improved by using the high-temperature-resistant filler of alumina and/or titanium dioxide; the curing agent of the polymerized phosphate (particularly polymerized aluminum phosphate) effectively promotes the normal-temperature curing of the coating, and simultaneously obviously improves the anti-corrosion performance of the coating; the mica and/or kaolin filler effectively improves the compactness of the coating and effectively reduces the preparation cost of the coating.
The preparation method of the high-temperature-resistant anti-corrosion silicate-based coating comprises the following process steps:
step 1, weighing raw materials and a viscosity regulator of the coating according to the formula amount;
uniformly mixing the weighed materials;
step 2, putting the uniformly mixed materials and grinding beads with the particle size of 0.5-1 mm into a stirrer;
grinding and dispersing at the rotating speed of 1000-2000 rpm for 30-60 min;
and filtering the mixture by using a 120-300-mesh screen to obtain filtrate, namely the high-temperature-resistant and anti-corrosion coating.
The technical measures disperse the materials with the formula amount by a grinding process, and the process is simple, low in cost and easy for industrial production; the obtained coating has balanced and stable performance, can effectively solve the technical problems of oxidation and corrosion of the heat-resistant steel component in a high-temperature corrosion environment, and reliably prolongs the service life of the heat-resistant steel component in the high-temperature corrosion environment.
The application method of the high-temperature-resistant anti-corrosion silicate-based coating is used for coating and protecting heat-resistant steel components applied to the ultra-supercritical steam turbine unit in a high-temperature corrosion environment.
Further, the application method comprises the following process steps:
step 1, carrying out sand blasting or polishing treatment on the surface of a heat-resistant steel member to be coated;
step 2, coating the coating on the corresponding surface of the heat-resistant steel component in a spraying, brushing or dip-coating manner at room temperature;
and 3, curing for more than 24 hours in a room temperature environment to obtain a high-temperature-resistant and corrosion-resistant coating structure on the corresponding surface of the heat-resistant steel component.
In the step 2 of the application method, the coating thickness of the coating on the corresponding surface of the heat-resistant steel member is at least one layer, and the single-layer coating thickness is 30-50 mu m;
and if the coating thickness of the coating on the corresponding surface of the heat-resistant steel member is more than two layers, the coating time interval between two adjacent layers is 10-20 min.
The technical measures are that the high-temperature-resistant and anti-corrosion coating is applied to the heat-resistant steel component of the ultra-supercritical steam turbine unit, so that the technical problems of oxidation and corrosion of the heat-resistant steel component applied to the ultra-supercritical steam turbine unit in a high-temperature corrosion environment are reliably solved by using the coating structure, the high-temperature corrosion resistance of the heat-resistant steel component of the ultra-supercritical steam turbine unit is improved, the service life of the heat-resistant steel component of the ultra-supercritical steam turbine unit is prolonged, the running safety of the ultra-supercritical steam turbine unit is ensured, and the development of the ultra-supercritical power generation technology is promoted.
The technical measures realize coating on the heat-resistant steel component of the ultra-supercritical steam turbine set in any one mode of spraying, brushing or dip-coating, and have the advantages of strong operability, simple process, low cost and easy industrial production; the obtained coating has compact and stable structure and reliable protection effect on the heat-resistant steel member in the corrosive environment of high-temperature steam.
The beneficial technical effects of the invention are as follows:
the coating adopting the technical measures has excellent high-temperature resistance and corrosion resistance, so that the technical problems of oxidation and corrosion of the heat-resistant steel component in a high-temperature corrosion environment can be effectively solved, and the service life of the heat-resistant steel component in the high-temperature corrosion environment is reliably prolonged;
the preparation method of the technical measure disperses the materials with the formula amount by a grinding process, has simple process and low cost, is easy for industrial production, and the obtained coating has balanced and stable performance;
according to the application method of the technical measures, the high-temperature-resistant and anti-corrosion coating is applied to the heat-resistant steel member of the ultra-supercritical steam turbine unit, and the coating is carried out on the heat-resistant steel member of the ultra-supercritical steam turbine unit in any one of spraying, brushing and dip-coating modes, so that the method is strong in operability, simple in process, low in cost and easy for industrial production, and the obtained coating is compact and stable in structure and reliable in protection effect on the heat-resistant steel member in the high-temperature steam corrosion environment.
Drawings
Fig. 1 to 5 show the corrosion and oxidation properties of CB2 heat-resistant steel coated with a high-temperature-resistant anti-corrosion coating, wherein:
FIG. 1 is a kinetic curve of a CB2 steel coated with a high-temperature-resistant anticorrosion coating and oxidized for 2000h at 650 ℃, wherein CB2 is a heat-resistant steel matrix, and CB2 is coated with coatings;
FIG. 2 is a kinetic curve of a CB2 steel coated with a high-temperature-resistant anticorrosion coating and oxidized for 2000h in a water vapor environment at 650 ℃, wherein CB2 is a heat-resistant steel matrix, and CB2 with coatings is a coated heat-resistant steel;
FIG. 3 is a macroscopic surface topography thermally shocked 50 times at 650 ℃;
FIG. 4 is a macroscopic morphology of CB2 steel coated with a high temperature resistant anti-corrosion coating and oxidized for 9324h at 650 ℃, wherein CB2 is a heat-resistant steel matrix, and coatings are coated heat-resistant steel;
FIG. 5 is a kinetic curve of the oxidation of CB2 steel coated with a high temperature resistant anticorrosion coating for 2000h at 630 ℃, wherein CB2 is a heat-resistant steel matrix, and coatings is coated heat-resistant steel.
Detailed Description
The invention relates to a coating, in particular to a high-temperature-resistant and anti-corrosion silicate-based coating, a preparation method and an application method thereof, which are particularly suitable for carrying out high-temperature-resistant and anti-corrosion treatment on a heat-resistant steel member applied to an ultra-supercritical steam turbine unit in a high-temperature corrosion environment.
Example 1
The high-temperature-resistant anticorrosive coating disclosed by the invention is composed of the following raw materials in parts by weight: 50 parts of liquid potassium silicate, 12 parts of polymerized aluminum phosphate with the particle size of about 20 mu m, 13 parts of alumina with the particle size of about 15 mu m, 10 parts of titanium dioxide powder with the particle size of about 10 mu m, 8 parts of mica powder with the particle size of about 20 mu m and 6 parts of distilled water.
The preparation method of the coating comprises the following process steps:
step 1, stirring and mixing the materials according to the formula amount uniformly;
step 2, putting the uniformly mixed materials and grinding beads with the particle size of about 1mm into a stirrer;
grinding and dispersing at 1000rpm for 30 min;
filtering with 200 mesh screen to obtain filtrate, i.e. high temperature resistant and anticorrosive paint.
The application method of the coating is to coat the prepared high-temperature-resistant and anti-corrosion coating on a heat-resistant steel component applied to the ultra-supercritical steam turbine unit in a high-temperature corrosion environment.
The heat resistant steel member used in the ultra supercritical steam turbine unit in the high temperature corrosive environment is generally CB2 heat resistant steel. The application process of the high temperature resistant and corrosion resistant silicate-based coating on the heat resistant steel member applied in the ultra-supercritical steam turbine set in the high temperature corrosion environment and the coating performance test are described in detail by taking a CB2 heat resistant steel sample as an example.
The application method of the coating comprises the following process steps:
step 1, carrying out sand blasting treatment on the surface of a CB2 heat-resistant steel sample to be coated;
step 2, coating the coating on the corresponding surface of the sample in two layers in a spraying manner in a clean room temperature environment;
the two-layer coating process comprises the steps of firstly spraying a first layer, wherein the thickness of the first layer is about 40 mu m, and then spraying a second layer after the surface of the first layer is dried for 20min, wherein the thickness of the second layer is about 40 mu m;
and 3, curing the sprayed sample for 24 hours in a clean room temperature environment, and obtaining a high-temperature-resistant and anti-corrosion coating structure on the corresponding surface of the sample.
The CB2 heat-resistant steel sample coated with the high-temperature-resistant and corrosion-resistant coating with the thickness of about 80 mu m has the following main performance parameters through test detection:
after the coating is oxidized for 2000 hours in an environment at 650 ℃, the weight change of the coating weight is very small except the weight loss at the initial stage, the coating has excellent oxidation resistance, and the kinetic curve is shown in figure 1;
after the CB2 heat-resistant steel sample with the coating is oxidized for 2000 hours in a water vapor environment at 650 ℃, the weight is constant, and the high-temperature resistance and corrosion resistance are excellent, and the kinetic curve is shown in figure 2.
Example 2
The high-temperature-resistant anticorrosive coating disclosed by the invention is composed of the following raw materials in parts by weight: 35 parts of liquid sodium silicate, 5 parts of polymerized aluminum phosphate with the particle size of about 15 mu m, 28 parts of titanium dioxide powder with the particle size of about 5 mu m, 5 parts of kaolin powder with the particle size of about 30 mu m and 4 parts of distilled water.
The preparation method of the coating comprises the following process steps:
step 1, stirring and mixing the materials according to the formula amount uniformly;
step 2, putting the uniformly mixed materials and grinding beads with the particle size of about 0.8mm into a stirrer;
grinding and dispersing at 1500rpm for 40 min;
filtering with a 300-mesh screen to obtain filtrate, namely the high-temperature-resistant and anti-corrosion coating.
The application method of the coating is to coat the prepared high-temperature-resistant and anti-corrosion coating on a heat-resistant steel component applied to the ultra-supercritical steam turbine unit in a high-temperature corrosion environment.
The heat resistant steel member used in the ultra supercritical steam turbine unit in the high temperature corrosive environment is generally CB2 heat resistant steel. The application process of the high temperature resistant and corrosion resistant silicate-based coating on the heat resistant steel member applied in the ultra-supercritical steam turbine set in the high temperature corrosion environment and the coating performance test are described in detail by taking a CB2 heat resistant steel sample as an example.
The application method of the coating comprises the following process steps:
step 1, carrying out sand blasting treatment on the surface of a CB2 heat-resistant steel sample to be coated;
step 2, coating the coating on the corresponding surface of the sample in two layers in a spraying manner in a clean room temperature environment;
the two-layer coating process comprises the steps of firstly spraying a first layer, wherein the thickness of the first layer is about 35 mu m, and then spraying a second layer after the surface of the first layer is dried for 15min, wherein the thickness of the second layer is about 35 mu m;
and 3, curing the sprayed sample for 24 hours in a clean room temperature environment, and obtaining a high-temperature-resistant and anti-corrosion coating structure on the corresponding surface of the sample.
The CB2 heat-resistant steel sample coated with the high-temperature-resistant and corrosion-resistant coating with the thickness of about 70 mu m has the following main performance parameters through test detection:
after 50 times of thermal shock in 650 ℃ environment, the coating is intact, no damage such as cracking, peeling and the like occurs, the thermal shock resistance is excellent, and the macroscopic surface morphology is shown in figure 3.
Example 3
The high-temperature-resistant anticorrosive coating disclosed by the invention is composed of the following raw materials in parts by weight: 10 parts of liquid sodium silicate, 30 parts of liquid potassium silicate, 5 parts of polymerized aluminum phosphate with the particle size of about 2 mu m, 5 parts of polymerized zinc phosphate with the particle size of about 10 mu m, 25 parts of titanium dioxide powder with the particle size of about 30 mu m, 3 parts of mica powder with the particle size of about 5 mu m, 5 parts of kaolin powder with the particle size of about 10 mu m and 5 parts of distilled water.
The preparation method of the coating comprises the following process steps:
step 1, stirring and mixing the materials according to the formula amount uniformly;
step 2, putting the uniformly mixed materials and grinding beads with the particle size of about 0.8mm into a stirrer;
grinding and dispersing at 2000rpm for 60 min;
filtering with a 220-mesh screen to obtain filtrate, namely the high-temperature-resistant and anti-corrosion coating.
The application method of the coating is to coat the prepared high-temperature-resistant and anti-corrosion coating on a heat-resistant steel component applied to the ultra-supercritical steam turbine unit in a high-temperature corrosion environment.
The heat resistant steel member used in the ultra supercritical steam turbine unit in the high temperature corrosive environment is generally CB2 heat resistant steel. The application process of the high temperature resistant and corrosion resistant silicate-based coating on the heat resistant steel member applied in the ultra-supercritical steam turbine set in the high temperature corrosion environment and the coating performance test are described in detail by taking a CB2 heat resistant steel sample as an example.
The application method of the coating comprises the following process steps:
step 1, carrying out sand blasting treatment on the surface of a CB2 heat-resistant steel sample to be coated;
step 2, coating the coating on the corresponding surface of the sample in two layers in a spraying manner in a clean room temperature environment;
the two-layer coating process comprises the steps of firstly spraying a first layer, wherein the thickness of the first layer is about 45 mu m, and then spraying a second layer after the surface of the first layer is dried for 13min, wherein the thickness of the second layer is about 50 mu m;
and 3, curing the sprayed sample for 24 hours in a clean room temperature environment, and obtaining a high-temperature-resistant and anti-corrosion coating structure on the corresponding surface of the sample.
The CB2 heat-resistant steel sample coated with the high-temperature-resistant and corrosion-resistant coating with the thickness of about 95 mu m has the following main performance parameters through test detection:
after the coating is oxidized for 9324 hours at 650 ℃, the coating is intact, no damage such as cracking, peeling and the like occurs, the coating has excellent oxidation resistance, and the macro morphology is shown in figure 4.
Example 4
The high-temperature-resistant anticorrosive coating disclosed by the invention is composed of the following raw materials in parts by weight: 5 parts of liquid sodium silicate, 40 parts of liquid potassium silicate, 3 parts of polymerized aluminum phosphate with the particle size of about 10 mu m, 6 parts of polymerized zinc phosphate with the particle size of about 30 mu m, 30 parts of alumina powder with the particle size of about 15 mu m, 6 parts of mica powder with the particle size of about 10 mu m and 6 parts of distilled water.
The preparation method of the coating comprises the following process steps:
step 1, stirring and mixing the materials according to the formula amount uniformly;
step 2, putting the uniformly mixed materials and grinding beads with the particle size of about 1mm into a stirrer;
grinding and dispersing at 1800rpm for 40 min;
filtering with 200 mesh screen to obtain filtrate, i.e. high temperature resistant and anticorrosive paint.
The application method of the coating is to coat the prepared high-temperature-resistant and anti-corrosion coating on a heat-resistant steel component applied to the ultra-supercritical steam turbine unit in a high-temperature corrosion environment.
The heat resistant steel member used in the ultra supercritical steam turbine unit in the high temperature corrosive environment is generally CB2 heat resistant steel. The application process of the high temperature resistant and corrosion resistant silicate-based coating on the heat resistant steel member applied in the ultra-supercritical steam turbine set in the high temperature corrosion environment and the coating performance test are described in detail by taking a CB2 heat resistant steel sample as an example.
The application method of the coating comprises the following process steps:
step 1, carrying out sand blasting treatment on the surface of a CB2 heat-resistant steel sample to be coated;
step 2, coating the coating on the corresponding surface of the sample in two layers in a spraying manner in a clean room temperature environment;
the two-layer coating process comprises spraying a first layer with a thickness of about 30 μm, and spraying a second layer with a thickness of about 50 μm after the first layer is dried for 11 min;
and 3, curing the sprayed sample for 24 hours in a clean room temperature environment, and obtaining a high-temperature-resistant and anti-corrosion coating structure on the corresponding surface of the sample.
The CB2 heat-resistant steel sample coated with the high-temperature-resistant and corrosion-resistant coating with the thickness of about 95 mu m has the following main performance parameters through test detection:
after being oxidized in a water vapor environment at 630 ℃ for 2000, the coating is intact, no damage such as cracking, peeling and the like occurs, and the coating has excellent oxidation resistance and corrosion resistance, and the kinetic curve is shown in figure 5.
The test results of the above embodiments show that the silicate-based coating prepared by the invention has excellent high temperature resistance and corrosion resistance, can effectively solve the technical problems of oxidation and corrosion of the heat-resistant steel member in a high-temperature corrosion environment, is particularly suitable for performing protection treatment on the heat-resistant steel member applied to the ultra-supercritical steam turbine set in a high-temperature steam corrosion environment, can remarkably improve the oxidation resistance and corrosion resistance of the heat-resistant steel member, is easy to control, and is suitable for industrial production.
The above examples are intended to illustrate the invention, but not to limit it.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: the above embodiment can still be modified, or some technical features can be equivalently replaced, for example, the coating can be coated on the corresponding surface of the heat-resistant steel member by adopting a brush coating or dip coating mode, and for example, the coating thickness of the coating on the corresponding surface of the heat-resistant steel member can be three layers or four layers; and such modifications or substitutions do not depart from the spirit and scope of the present invention in its essence.
Claims (10)
1. The high-temperature-resistant anticorrosive silicate-based coating is characterized by comprising the following raw materials in parts by weight:
30-60 parts of liquid silicate,
5-15 parts of a curing agent,
20-30 parts of high-temperature resistant filler,
5-10 parts of an extender filler.
2. The high-temperature-resistant anticorrosion silicate-based coating according to claim 1, wherein the coating has a viscosity adjusted with distilled water, and the mass ratio of the distilled water to the total amount of the coating is 1: 10 to 20.
3. The high temperature resistant anticorrosion silicate-based coating of claim 1, wherein the liquid silicate is potassium silicate, sodium silicate, or a mixture thereof.
4. The high temperature-resistant anticorrosion silicate-based coating according to claim 1, wherein the curing agent is polymerized aluminum phosphate, polymerized zinc phosphate or a mixture thereof with a particle size of 2 to 30 μm.
5. The high-temperature-resistant anticorrosion silicate-based coating according to claim 1, wherein the high-temperature-resistant filler is alumina, titanium dioxide or a mixture thereof with a particle size of 1-20 μm.
6. The high-temperature-resistant anticorrosion silicate-based coating according to claim 1, wherein the extender filler is mica powder, kaolin powder or a mixture thereof with a particle size of 10-50 μm.
7. A process for the preparation of the high temperature resistant anticorrosion silicate-based coating of claim 1, wherein the process comprises the following process steps:
step 1, weighing raw materials and a viscosity regulator of the coating according to the formula amount;
uniformly mixing the weighed materials;
step 2, putting the uniformly mixed materials and grinding beads with the particle size of 0.5-1 mm into a stirrer;
grinding and dispersing at the rotating speed of 1000-2000 rpm for 30-60 min;
step 3, taking out the ground and dispersed materials from the stirrer;
and filtering the mixture by using a 120-300-mesh screen to obtain filtrate, namely the high-temperature-resistant and anti-corrosion coating.
8. The method of applying the high temperature resistant anticorrosion silicate-based coating of claim 1, wherein the coating is used as a coating protection for heat resistant steel components used in ultra supercritical steam turbine units in high temperature corrosive environments.
9. The method of applying a high temperature resistant anticorrosion silicate-based coating as claimed in claim 8, wherein the method of applying comprises the following process steps:
step 1, carrying out sand blasting or polishing treatment on the surface of a heat-resistant steel member to be coated;
step 2, coating the coating on the corresponding surface of the heat-resistant steel component in a spraying, brushing or dip-coating manner at room temperature;
and 3, curing for more than 24 hours in a room temperature environment to obtain a high-temperature-resistant and corrosion-resistant coating structure on the corresponding surface of the heat-resistant steel component.
10. The method for applying the high temperature resistant anticorrosion silicate-based coating according to claim 9, wherein in the step 2, the coating thickness of the coating on the corresponding surface of the heat-resistant steel member is at least one layer, and the single-layer coating thickness is 30-50 μm;
and if the coating thickness of the coating on the corresponding surface of the heat-resistant steel member is more than two layers, the coating time interval between two adjacent layers is 10-20 min.
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Application publication date: 20220412 |