JPS591792B2 - How to remove smut from aluminum material - Google Patents
How to remove smut from aluminum materialInfo
- Publication number
- JPS591792B2 JPS591792B2 JP9441278A JP9441278A JPS591792B2 JP S591792 B2 JPS591792 B2 JP S591792B2 JP 9441278 A JP9441278 A JP 9441278A JP 9441278 A JP9441278 A JP 9441278A JP S591792 B2 JPS591792 B2 JP S591792B2
- Authority
- JP
- Japan
- Prior art keywords
- aluminum material
- aluminum
- smut
- remove smut
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Electrochemical Coating By Surface Reaction (AREA)
- Chemical Treatment Of Metals (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- ing And Chemical Polishing (AREA)
Description
【発明の詳細な説明】
本発明はアルミニウム又はアルミニウム合金など、アル
ミニウム素材を陽極皮膜処理や塗装下地用化成皮膜処理
などの表面処理の前工程として実施する脱脂によつて発
生する上記アルミニウム素材上のスマツト除去方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for cleaning aluminum materials such as aluminum or aluminum alloys, which is generated by degreasing the aluminum materials as a pre-process of surface treatment such as anodic coating treatment or chemical conversion coating treatment for painting bases. This invention relates to a method for removing smut.
上記工程における脱脂は、一般に有機溶剤やアルカリ脱
脂液が使用され、この中でもアルカリ脱脂液が使用され
る場合が多い。これはアルミニウム素材のわずかな表面
腐食を兼ねた脱脂効果が得られるためである。上記アル
カリ脱脂液としては濃度が５〜１０重量％の苛性ソーダ
溶液がよく用いられ、上記苛性ソーダの作用によつてア
ルミニウム素材の表面腐食と脱脂が行なわれる。For degreasing in the above step, an organic solvent or an alkaline degreasing solution is generally used, and among these, an alkaline degreasing solution is often used. This is because a degreasing effect can be obtained that also serves as a slight surface corrosion of the aluminum material. As the alkaline degreasing solution, a caustic soda solution having a concentration of 5 to 10% by weight is often used, and the action of the caustic soda corrodes the surface of the aluminum material and degreases it.
この際、上記アルミニウム素材に含有されるマグネシウ
ム、銅、硅素などの不純物が苛性ソーダに溶解されずに
黒色皮膜としてアルミニウム素材の表面に生成する。こ
の黒色皮膜がスマツトと呼ばれている。上記スマツトが
アルミニウム素材に残存したままで表面処理を行なうと
表面処理皮膜の生成にむらが生ずるので、表面処理の前
工程として上記スマツトの除去を実施している。At this time, impurities such as magnesium, copper, and silicon contained in the aluminum material are not dissolved in the caustic soda and are formed as a black film on the surface of the aluminum material. This black film is called smut. If the surface treatment is performed while the smut remains on the aluminum material, the surface treatment film will be unevenly formed, so the smut is removed as a preliminary step to the surface treatment.
従来、上記スマツトの除去は酸浸漬によつて行なわれて
おり、上記酸浸漬液としては硝酸又は硝酸と弗化水素酸
との混合液等が使用されている。Conventionally, the removal of the smut has been carried out by dipping in an acid, and the dipping solution used is nitric acid or a mixture of nitric acid and hydrofluoric acid.
酸浸漬液は通常、アルミニウム鋳造品又はアルミニウム
ダイキャスト品等の不純物の多いアルミニウム素材には
硝酸と弗化水素酸との混合液が、比較的不純物の少ない
アルミニウム素材には硝酸液が用いられている。上記酸
浸漬によるスマツト除去方法はアルミニウム素材だけで
構成された部品において実施できる方法であり、アルミ
ニウム素材と鉄素材とが組合わされて構成された部品に
おいては上記酸浸液が鉄素材部品を激しく溶解し、実施
できない欠点があつた。Generally, a mixed solution of nitric acid and hydrofluoric acid is used for aluminum materials with many impurities, such as aluminum castings or aluminum die-cast products, and a nitric acid solution is used for aluminum materials with relatively few impurities. There is. The method for removing smut by acid immersion is a method that can be carried out on parts made only of aluminum, and in parts made of a combination of aluminum and iron, the acid immersion will violently dissolve the iron parts. However, there was a drawback that it could not be implemented.
又、酸浸漬実施中は排気設備を設けなければならず、か
つ使用後の廃液は処理施設によつて処理後放出しなけれ
ばならない等の欠点もあつた。In addition, there were other disadvantages such as exhaust equipment had to be provided during acid immersion, and the waste liquid after use had to be discharged after treatment at a treatment facility.
Claims (1)
の脱脂によつて発生するスマツトを、水蒸気と水との混
合物を上記スマツトに吹きつけて行なうアルミニウム素
材のスマツト除去方法。1. A method for removing smut from an aluminum material by spraying a mixture of steam and water onto the smut generated by degreasing as a preliminary step in surface treatment of the aluminum material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9441278A JPS591792B2 (en) | 1978-08-02 | 1978-08-02 | How to remove smut from aluminum material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9441278A JPS591792B2 (en) | 1978-08-02 | 1978-08-02 | How to remove smut from aluminum material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5521563A JPS5521563A (en) | 1980-02-15 |
| JPS591792B2 true JPS591792B2 (en) | 1984-01-13 |
Family
ID=14109523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9441278A Expired JPS591792B2 (en) | 1978-08-02 | 1978-08-02 | How to remove smut from aluminum material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS591792B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100417747C (en) * | 2005-03-03 | 2008-09-10 | 安徽马钢和菱包装材料有限公司 | Strip steel surface treatment device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6166554U (en) * | 1984-10-05 | 1986-05-07 | ||
| JPH0432583A (en) * | 1990-05-29 | 1992-02-04 | Furukawa Alum Co Ltd | Production of al sheet having superior coatability |
-
1978
- 1978-08-02 JP JP9441278A patent/JPS591792B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100417747C (en) * | 2005-03-03 | 2008-09-10 | 安徽马钢和菱包装材料有限公司 | Strip steel surface treatment device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5521563A (en) | 1980-02-15 |
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