JPS55115990A - Two-stage electrolytic coloring method of aluminum and aluminum alloy - Google Patents
Two-stage electrolytic coloring method of aluminum and aluminum alloyInfo
- Publication number
- JPS55115990A JPS55115990A JP2394279A JP2394279A JPS55115990A JP S55115990 A JPS55115990 A JP S55115990A JP 2394279 A JP2394279 A JP 2394279A JP 2394279 A JP2394279 A JP 2394279A JP S55115990 A JPS55115990 A JP S55115990A
- Authority
- JP
- Japan
- Prior art keywords
- electrolysis
- constant voltage
- primary
- sulfuric acid
- metal salts
- 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.)
- Granted
Links
Landscapes
- Electrochemical Coating By Surface Reaction (AREA)
Abstract
PURPOSE: To form the colored film of superior corrosion resistance and abrasion resistance by electrolyzing the Al or Al alloy having been formed with a porous oxide film through anodic oxidation in an aqueous sulfuric acid solution containing heavy metal salts, with the same as anode, under the DC constant voltage below the foregoing electrolysis voltage then intermitting DC constant voltage electrolysis with the same as cathode.
CONSTITUTION: Al or Al alloy is subjected to primary electrolysis treatment, i.e., anodic oxidation treatment, in an aqueous solution of 80W300g/l sulfuric acid (primary electrolyte) to let the porous oxide film of the target thickness be formed. Next, this treated matter being held intact without rinsing is subjected as anode to the DC constant voltage electrolysis in an aqueous solution of 30W200g/l sulfuric acid (secondary electrolytic coloring solution) containing heavy metal salts (e.g., stannous sulfate) being coloring metal salts at the DC constant voltage lower by 2W 5V than the primary electrolysis voltage, i.e., of 8W15V, whereby the activation of the film is achieved. Thence, with this treated matter as cathode, it is intermittently subjected to the DC constant voltage electrolysis approximately equal to the primary electrolysis (12W25V), whereby the even dark color film is formed.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2394279A JPS55115990A (en) | 1979-03-01 | 1979-03-01 | Two-stage electrolytic coloring method of aluminum and aluminum alloy |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2394279A JPS55115990A (en) | 1979-03-01 | 1979-03-01 | Two-stage electrolytic coloring method of aluminum and aluminum alloy |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55115990A true JPS55115990A (en) | 1980-09-06 |
JPS5742716B2 JPS5742716B2 (en) | 1982-09-10 |
Family
ID=12124580
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2394279A Granted JPS55115990A (en) | 1979-03-01 | 1979-03-01 | Two-stage electrolytic coloring method of aluminum and aluminum alloy |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55115990A (en) |
-
1979
- 1979-03-01 JP JP2394279A patent/JPS55115990A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5742716B2 (en) | 1982-09-10 |
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