CN102312264B - Decorative oxidation method for aluminum and aluminum alloy - Google Patents

Decorative oxidation method for aluminum and aluminum alloy Download PDF

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Publication number
CN102312264B
CN102312264B CN 201110240298 CN201110240298A CN102312264B CN 102312264 B CN102312264 B CN 102312264B CN 201110240298 CN201110240298 CN 201110240298 CN 201110240298 A CN201110240298 A CN 201110240298A CN 102312264 B CN102312264 B CN 102312264B
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cleaning
oxidation
aluminum
current density
hard anodizing
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CN102312264A (en
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谢利荣
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Wujiang Fine Workmanship and Aluminum Word Manufactory
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Wujiang Fine Workmanship and Aluminum Word Manufactory
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Abstract

The invention relates to a decorative oxidation method for aluminum and aluminum alloy. According to the method, an aluminum product is subjected to treatments of chemical degreasing, cleaning, neutralization, cleaning, hard anodic oxidation, cleaning and sealing to obtain a coating. The decorative oxidation method is characterized in that: 1 L of the oxidation solution used in the hard anodic oxidation step comprises: 20-50 g of oxalic acid, 30-50 g of ethylene glycol, 1-10 g of boric acid, 0.1-1 g of ammonium sulfate and 0.1-1 g of ammonium sulphonate; the process parameters of the hard anodic oxidation step are as follows: the temperature is 10-25 DEG C, the starting voltage is 0-50 V, the final voltage is more than 100 V, the anode current density is 2.5-3.0 A/dm<2>, the time is 50-70minutes, the cathode material is the lead plate, and the anode moving is 25-30 times/min. The prepared coating provided by the present invention is yellow, fine and compact, has the hardness of HV450-700 and the thickness of 40-50 micrometer, and can be continuously produced.

Description

The ornamental oxidation style of aluminium and aluminium alloy
Technical field
The present invention relates to the ornamental oxidation style of a kind of aluminium and aluminium alloy, relate to the anonizing of aluminium and aluminium alloy specifically.The process of surface treatment that belongs to aluminium alloy.
Background technology
The ornamental oxidation style kind of aluminium and aluminium alloy is a lot, generally can be divided into chemical oxidization method and electrochemical oxidation process is anonizing two big classes, wherein latter's application is more extensive, because the oxide film that anonizing obtains is better than the properties of oxide-film that all chemical oxidization methods obtain.Generally speaking the oxide film that obtains of anonizing is bright and clean, bright, transparency is higher, again through dyeing, can obtain the surface of various color glows.
Summary of the invention
Technical problem to be solved by this invention provides the ornamental oxidation style of a kind of aluminium and aluminium alloy, can obtain rete fine and smooth, fine and close, high rigidity.
For solving the problems of the technologies described above, the present invention realizes like this
The ornamental oxidation style of a kind of aluminium and aluminium alloy, alumiaum article obtains rete after electrochemical deoiling, cleaning, neutralization, cleaning, hard anodizing, cleaning, sealing, it is characterized in that: the oxidation liquid of hard anodizing step is: oxalic acid 20-50g/L, ethylene glycol 30-50 g/L, boric acid 1-10 g/L, ammonium sulfate 0.1-1g/L, ammonium sulphonate 0.1-1g/L; Hard anodizing process parameter is: temperature 10-25 ℃, the initial 0-50V of voltage, and finally greater than 100V, anodic current density 2.5-3.0A/dm 2, time 50-70min, cathode material are stereotypes, anode moves 25-30 time/min.
Concentration of oxalic acid is too low, and then oxide film is thin, and concentration is too high, and then rete is loose, can be dissolved falls.
The temperature of electrolytic solution is very big to hardness and the wear resistance influence of rete, and usually, temperature decline hardness and wear resisting property strengthen.
Anodic current density is relevant with film forming speed, improve current density then film forming speed accelerate, oxidization time shortens, but when overstepping the extreme limit current density, heating strengthens during oxidation, then film hardness reduces.
The present invention has following positive effect: the rete that the present invention obtains is yellow, and fine and smooth, fine and close, hardness reaches HV450-700, and thickness reaches the 40-50 micron, can produce continuously.
Embodiment
The present invention is described in further detail below in conjunction with embodiment.
The test specimen of following examples is that surface-area is 0.25dm 2The technical pure aluminium sheet.
Embodiment 1
The ornamental oxidation style of a kind of aluminium and aluminium alloy, alumiaum article obtains rete after electrochemical deoiling, cleaning, neutralization, cleaning, hard anodizing, cleaning, sealing.
The oxidation liquid of hard anodizing step is: oxalic acid 20g/L, ethylene glycol 30 g/L, boric acid 1 g/L, ammonium sulfate 0.1g/L, ammonium sulphonate 0.1g/L;
Hard anodizing process parameter is: 10 ℃ of temperature, the initial 0-50V of voltage, and finally greater than 100V, anodic current density 2.5A/dm 2, current density risen to predetermined initial current in the 30s after, allow electric current and voltage along with the carrying out of oxidising process changes automatically, time 70min, cathode material are stereotypes, anode moves 30 times/min.Electrolytic solution is cooled with circulating water.
It is yellow that the rete that obtains is, and fine and smooth, fine and close, hardness reaches HV470, and thickness reaches 40 microns, can produce continuously.
Embodiment 2
The ornamental oxidation style of a kind of aluminium and aluminium alloy, alumiaum article obtains rete after electrochemical deoiling, cleaning, neutralization, cleaning, hard anodizing, cleaning, sealing.
The oxidation liquid of hard anodizing step is: oxalic acid 30g/L, ethylene glycol 40 g/L, boric acid 3 g/L, ammonium sulfate 0.5g/L, ammonium sulphonate 0.4g/L;
Hard anodizing process parameter is: 15 ℃ of temperature, the initial 20V of voltage, and finally greater than 100V, anodic current density 3.0A/dm 2, current density risen to predetermined initial current in the 30s after, allow electric current and voltage along with the carrying out of oxidising process changes automatically, time 60min, cathode material are stereotypes, anode moves 26 times/min.Electrolytic solution is cooled with circulating water.
It is yellow that the rete that obtains is, and fine and smooth, fine and close, hardness reaches HV540, and thickness reaches 42 microns, can produce continuously.
Embodiment 3
The ornamental oxidation style of a kind of aluminium and aluminium alloy, alumiaum article obtains rete after electrochemical deoiling, cleaning, neutralization, cleaning, hard anodizing, cleaning, sealing.
The oxidation liquid of hard anodizing step is: oxalic acid 50g/L, ethylene glycol 50 g/L, boric acid 10 g/L, ammonium sulfate 1g/L, ammonium sulphonate 1g/L;
Hard anodizing process parameter is: 25 ℃ of temperature, the initial 50V of voltage, and finally greater than 100V, anodic current density 3.0A/dm 2, current density risen to predetermined initial current in the 30s after, allow electric current and voltage along with the carrying out of oxidising process changes automatically, time 50min, cathode material are stereotypes, anode moves 28 times/min.Electrolytic solution is cooled with circulating water.
It is yellow that the rete that obtains is, and fine and smooth, fine and close, hardness reaches HV680, and thickness reaches 45 microns, can produce continuously.
Above-mentioned embodiment does not limit technical scheme of the present invention in any form, and every employing is equal to replaces or technical scheme that the mode of equivalent transformation obtains all drops on protection scope of the present invention.

Claims (1)

1. the ornamental oxidation style of an aluminium and aluminium alloy, alumiaum article obtains rete after electrochemical deoiling, cleaning, neutralization, cleaning, hard anodizing, cleaning, sealing, it is characterized in that: the oxidation liquid of hard anodizing step is: oxalic acid 20-50g/L, ethylene glycol 30-50 g/L, boric acid 1-10 g/L, ammonium sulfate 0.1-1g/L, ammonium sulphonate 0.1-1g/L; Hard anodizing process parameter is: temperature 10-25 ℃, the initial 0-50V of voltage, and finally greater than 100V, anodic current density 2.5-3.0A/dm 2, current density risen to predetermined initial current in the 30s after, allow electric current and voltage along with the carrying out of oxidising process changes automatically, time 50-70min, cathode material are stereotypes, anode moves 25-30 time/min.
CN 201110240298 2011-08-22 2011-08-22 Decorative oxidation method for aluminum and aluminum alloy Expired - Fee Related CN102312264B (en)

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Publication number Priority date Publication date Assignee Title
CN103966639A (en) * 2013-01-29 2014-08-06 佛山市广成铝业有限公司 Method for preparing anodised aluminium section bar
CN103484913B (en) * 2013-09-16 2016-08-17 李淑兰 Hard Anodic Oxidation of Aluminum Alloy processes technique
CN106906511A (en) * 2017-02-23 2017-06-30 西华大学 Method for replacing stirring of anodic oxidation tank liquor
JP2020033591A (en) * 2018-08-29 2020-03-05 いすゞ自動車株式会社 Production method of metal compact having anodic oxide film, metal compact having anodic oxide film, piston, and internal combustion engine

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