JP4765411B2 - Surface treatment method of aluminum and aluminum alloy - Google Patents
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- JP4765411B2 JP4765411B2 JP2005159944A JP2005159944A JP4765411B2 JP 4765411 B2 JP4765411 B2 JP 4765411B2 JP 2005159944 A JP2005159944 A JP 2005159944A JP 2005159944 A JP2005159944 A JP 2005159944A JP 4765411 B2 JP4765411 B2 JP 4765411B2
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Description
本発明は、アルミニウム及びアルミニウム合金を用いた押出材の表面のダイスマークを除去する表面処理方法に関する。 The present invention relates to a surface treatment method for removing dice marks on the surface of an extruded material using aluminum and an aluminum alloy.
アルミニウム及びアルミニウム合金を用いた押出材の表面には、押出型のダイス跡がダイスマーク（ダイライン）として現れる。
このダイスマークを除去する方法として、特開平１１−１７２４６８号公報には梨地処理する方法を開示する。
しかし、上記に開示の方法では、金属光沢が無くなる梨地にしなければならず、アルミ金属の特徴が出なくなるだけでなく、薬品使用量が多くなる。
また、複数の薬品を使用しなければならない点で、浴の管理が大変で、排水処理費も高くなる。
On the surface of the extruded material using aluminum and an aluminum alloy, a die mark of the extrusion die appears as a die mark (die line).
As a method for removing the dice mark, Japanese Patent Application Laid-Open No. 11-172468 discloses a method for performing a satin finish treatment.
However, in the method disclosed above, it is necessary to use a satin finish that eliminates the metallic luster, and not only does the characteristics of aluminum metal appear, but also the amount of chemicals used increases.
In addition, since a plurality of chemicals must be used, the management of the bath is difficult and the wastewater treatment cost is high.
本発明は上記背景技術に鑑みて、アルミ金属外観の特徴を維持しつつ、少ない薬品消費量でダイスマークを除去でき、条件管理が容易なアルミニウム及びアルミニウム合金の表面処理方法の提供を目的とする。 In view of the above-described background art, the present invention aims to provide a surface treatment method for aluminum and aluminum alloy that can remove dice marks with a small amount of chemical consumption while maintaining the characteristics of an aluminum metal appearance, and can easily manage conditions. .
本発明に係るアルミニウム及びアルミニウム合金材（以下、単にアルミニウム合金材と称する）の表面処理方法は、濃度０．１３ｍｏｌ／Ｌ以上のアルカリ金属水酸化物の水溶液中で、アルミニウム又はアルミニウム合金材を陽極として電圧１０Ｖ以上で電気量１．５〜９．０Ａ・ｈｒ／ｄｍ２ を通電し、エッチングすることを特徴とする。 In the surface treatment method for aluminum and aluminum alloy material (hereinafter simply referred to as aluminum alloy material) according to the present invention, an aluminum or aluminum alloy material is treated as an anode in an aqueous solution of alkali metal hydroxide having a concentration of 0.13 mol / L or more. As described above, etching is performed by supplying a current of 1.5 to 9.0 A · hr / dm 2 at a voltage of 10 V or more.
ここで、アルカリ金属とは、リチウム、ナトリウム、カリウム等をいい、アルカリ金属水酸化物としては、水溶液にした状態で強アルカリ性を示すものであればよく、入手しやすく排水処理が容易である観点からは、水酸化リチウム、水酸化ナトリウム、水酸化カリウム等が好ましい。
アルカリ金属水酸化物の濃度は、遊離アルカリ分の濃度を意味する。
アルカリ金属水酸化物の濃度が０．０１ｍｏｌ／Ｌ未満ではアルミニウムの溶解量が少なく、必要な電気量を通電してもアルミニウム合金材の表面のダイスマークが除去されない。
アルカリ金属水酸化物の濃度が濃くなると、電流が流れやすくなり、電解時間、電圧等を調節し、電気量を１．５〜９．０Ａ・ｈｒ／ｄｍ２ の範囲にする。
なお、電圧が１０Ｖ未満では電解がほとんど進行しない。
単位面積当たりに通電する電気量を１．５〜９．０Ａ・ｈｒ／ｄｍ２の範囲にすると、安定してダイスマークを除去できる。
従って、電解方法は定電圧でも定電流でもよく、その組み合わせでもよい。
また、電流波形にも制限はない。
ここで、Ａ・ｈｒ／ｄｍ２ なる単位は、１デシ平方メートルの面積当たりの電流アンペアと通電時間の積を意味する。
従って、電解方法は定電圧でも定電流でもよく、その組み合わせでもよい。
また、電流波形にも制限はない。
通電する電気量が１．５Ａ・ｈｒ／ｄｍ２ 未満では、アルミの溶解が少なく、ダイスマーク除去の効果が認められない。
一方、９．０Ａ・ｈｒ／ｄｍ２を超えるとアルミの溶解量が多くなり、ダイスマークが消えるものの、アルミ金属とは異なる質感の外観になる。
Here, the alkali metal refers to lithium, sodium, potassium, and the like, and the alkali metal hydroxide is not particularly limited as long as it exhibits strong alkalinity in the state of an aqueous solution, and is easy to obtain and easy to drain. Is preferably lithium hydroxide, sodium hydroxide, potassium hydroxide or the like.
The concentration of alkali metal hydroxide means the concentration of free alkali.
When the concentration of the alkali metal hydroxide is less than 0.01 mol / L , the amount of aluminum dissolved is small, and the dice mark on the surface of the aluminum alloy material is not removed even when a necessary amount of electricity is applied.
When the concentration of the alkali metal hydroxide is increased, the electric current easily flows, the electrolysis time, the voltage, and the like are adjusted, and the amount of electricity is set in the range of 1.5 to 9.0 A · hr / dm 2 .
In addition, electrolysis hardly progresses if a voltage is less than 10V.
When the amount of electricity to be energized per unit area is in the range of 1.5 to 9.0 A · hr / dm 2 , the dice marks can be stably removed.
Therefore, the electrolysis method may be a constant voltage, a constant current, or a combination thereof.
Also, there is no limit to the current waveform.
Here, the unit of A · hr / dm 2 means the product of current ampere and energization time per 1 sq. Meter.
Therefore, the electrolysis method may be a constant voltage, a constant current, or a combination thereof.
Also, there is no limit to the current waveform.
When the amount of electricity to be energized is less than 1.5 A · hr / dm 2 , aluminum is hardly dissolved and the effect of removing the dice mark is not recognized.
On the other hand, if it exceeds 9.0 A · hr / dm 2 , the amount of aluminum dissolved increases and the die mark disappears, but the appearance of the material is different from that of aluminum metal.
本発明による表面処理は、梨地外観にまで表面を粗面化しなくてもダイスマークを除去できるので、アルミ金属の外観を維持し汎用性のあるアルミニウム合金材を得ることができる。
また、排水処理の負荷が少ない。
本発明における電解制御は、通電電気量の制御によるので電解浴中のアルミ不純物や浴温等の影響が少なく条件管理が容易である。
The surface treatment according to the present invention can remove the dice mark without roughening the surface to a satin appearance, so that a general-purpose aluminum alloy material can be obtained while maintaining the appearance of the aluminum metal.
Moreover, there is little load of wastewater treatment.
Since the electrolysis control in the present invention is based on the control of the amount of energized electricity, the influence of aluminum impurities in the electrolysis bath, the bath temperature, etc. is small, and condition management is easy.
アルミニウム合金材の代表例として、ＪＩＳに規定の６０６３合金を用いた押出形材に対して図１の表に示す条件で表面処理を実施した。
（電解液）
アルカリ金属水酸化物の代表例として、水酸化ナトリウム（ＮａＯＨ）、水酸化カリウム（ＫＯＨ）を用い、比較例として炭酸ナトリウム（Ｎａ２ＣＯ３）を用いた。
水溶液の濃度及び液温は、図１の表に示す。
（電解条件）
電流波形としては、直流、交直重畳、矩形波を代表例として用いた。
電解方式としては、定電圧を用い、電気量積算計にて所定の電気量が通電すると電解が自動的にストップするようになっている。
As a representative example of the aluminum alloy material, a surface treatment was performed on the extruded shape using the 6063 alloy specified in JIS under the conditions shown in the table of FIG.
(Electrolyte)
Sodium hydroxide (NaOH) and potassium hydroxide (KOH) were used as representative examples of the alkali metal hydroxide , and sodium carbonate (Na 2 CO 3 ) was used as a comparative example.
The concentration and temperature of the aqueous solution are shown in the table of FIG.
(Electrolysis conditions)
As current waveforms, direct current, AC / DC superimposition, and rectangular waves were used as representative examples.
As an electrolysis method, a constant voltage is used, and electrolysis is automatically stopped when a predetermined amount of electricity is energized by an electricity meter.
（評価結果）
図１の表に表面処理条件とともに、ダイスマークの除去評価結果を示す。
評価基準としては、下記のように目視評価した。
○：ダイスマーク（ダイライン）が使用上問題にならない程度まで低減している。
×：ダイスマーク（ダイライン）が低減していない。
実施例１は、水酸化ナトリウム（ＮａＯＨ）０．２５ｍｏｌ／Ｌ、浴温３０℃の水溶液中で、６０６３合金からなる押出形材を陽極にし、電圧２０Ｖで３０分間、直流電解し、系に流れた電気量が、２．０Ａ・ｈｒ／ｄｍ２ であったことを示し、ダイスマークが除去されていた。
実施例２においては、電圧を４０Ｖに上げて電気量１．８Ａ・ｈｒ／ｄｍ２ 通電するのに電解時間が５分ですみ、浴温５℃でも、ダイスマークを除去できた。
実施例３では、アルカリ濃度を０．７５ｍｏｌ／Ｌまで濃くしたが、電気量が２．４Ａ・ｈｒ／ｄｍ２ であるとアルミの質感を維持しつつ、ダイスマークを除去できた。
実施例４から、アルカリ濃度を０．１３ｍｏｌ／Ｌに薄くしても電気量を維持するとダイスマークを除去できることがわかる。
実施例５、６では、電気量９Ａ・ｈｒ／ｄｍ２ を超えて通電すると、ダイスマークが除去できるものの表面の質感がアルミ金属とは異なった。
実施例７から、アルカリ金属水酸化物として、水酸化カリウムを用いてもよいことがわかり、実施例８、９から陽極酸化皮膜を形成しても、電解着色を施しても影響がないことがわかる。
また、実施例１０、１１から電流波形が、交直重畳、矩形波形でもよいことがわかる。
これに対して、比較例１〜４から電気量が１．５Ａ・ｈｒ／ｄｍ２ 未満であれば、ダイスマークを除去できないことがわかる。
これにより、通電する電気量が１．５〜９．０Ａ・ｈｒ／ｄｍ２の範囲に入るように、通電電気量を制御するとアルミの質感を維持しつつ、ダイスマークを除去できることが明らかになった。
比較例５は、炭酸ナトリウムの水溶液を用いたもので、通電しやすくするために、２．８ｍｏｌ／Ｌまで濃度を上げていってもダイスマークを除去できなかった。
(Evaluation results)
The table of FIG. 1 shows the results of evaluating the removal of dice marks together with the surface treatment conditions.
As evaluation criteria, visual evaluation was performed as follows.
○: The die mark (die line) has been reduced to a level that does not cause a problem in use.
X: Dice mark (die line) is not reduced.
In Example 1, in an aqueous solution of sodium hydroxide (NaOH) 0.25 mol / L and a bath temperature of 30 ° C., an extruded shape made of 6063 alloy was used as an anode, DC electrolysis was performed at a voltage of 20 V for 30 minutes, and the flow into the system The amount of electricity was 2.0 A · hr / dm 2 , and the dice mark was removed.
In Example 2, the electrolysis time was 5 minutes to increase the voltage to 40 V and energize 1.8 A · hr / dm 2 , and the dice marks could be removed even at a bath temperature of 5 ° C.
In Example 3, the alkali concentration was increased to 0.75 mol / L, but when the amount of electricity was 2.4 A · hr / dm 2 , the dice marks could be removed while maintaining the texture of aluminum.
From Example 4, it can be seen that the dice marks can be removed if the amount of electricity is maintained even if the alkali concentration is reduced to 0.13 mol / L.
In Examples 5 and 6, when energization exceeding 9 A · hr / dm 2 was performed, the surface of the surface texture was different from that of aluminum metal although the dice marks could be removed.
From Example 7, it can be seen that potassium hydroxide may be used as the alkali metal hydroxide , and even if an anodic oxide film is formed from Examples 8 and 9, there is no effect even if electrolytic coloring is applied. Recognize.
Further, it can be seen from Examples 10 and 11 that the current waveform may be an AC / DC superposition or a rectangular waveform.
On the other hand, it can be seen from Comparative Examples 1 to 4 that the dice mark cannot be removed if the amount of electricity is less than 1.5 A · hr / dm 2 .
As a result, it becomes clear that the dice marks can be removed while maintaining the texture of aluminum by controlling the amount of electricity to be energized so that the amount of electricity to be energized falls within the range of 1.5 to 9.0 A · hr / dm 2. It was.
In Comparative Example 5, an aqueous solution of sodium carbonate was used, and the dice mark could not be removed even when the concentration was increased to 2.8 mol / L in order to facilitate energization.
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| JP2826755B2 (en) * | 1990-01-08 | 1998-11-18 | 日本ニュークローム株式会社 | Pretreatment of aluminum and aluminum alloy plating |
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