JPS644491A - Pretreatment of anodization of valve metal - Google Patents
Pretreatment of anodization of valve metalInfo
- Publication number
- JPS644491A JPS644491A JP16040687A JP16040687A JPS644491A JP S644491 A JPS644491 A JP S644491A JP 16040687 A JP16040687 A JP 16040687A JP 16040687 A JP16040687 A JP 16040687A JP S644491 A JPS644491 A JP S644491A
- Authority
- JP
- Japan
- Prior art keywords
- valve metal
- acid
- chelating agent
- pickling
- crystal grains
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
- C23G1/106—Other heavy metals refractory metals
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
PURPOSE:To obtain uniform and colorful coloring without any colored mottle and having excellent luster by pickling a valve metal having coarse crystal grains with an aq. mixed soln. of hydrofluoric acid and a chelating agent having a specified concn., and then anodizing the metal. CONSTITUTION:The crystal grains of a valve metal such as Ti, Ta, Zr, and their alloy are coarsened by vacuum annealing, etc. When the valve metal having the coarse crystal grains is to be anodized, the valve metal is pickled with an aq. mixed soln. contg. 0.05-10wt.% hydrofluoric acid and >=0.2wt.% chelating agent as the pretreatment. Hydrogen peroxide, tartaric acid, oxalic acid, citric acid, EDTA, etc., are used as the chelating agent. The valve metal can be successively treated, if necessary, with dil. sulfuric acid and dil. hydrofluoric acid before pickling to preferentially etch the crystal grain. The oxide film on the valve metal surface is removed by the pickling, the activated surface is stabilized, and an oxide film can be formed by the succeeding anodization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16040687A JPS644491A (en) | 1987-06-26 | 1987-06-26 | Pretreatment of anodization of valve metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16040687A JPS644491A (en) | 1987-06-26 | 1987-06-26 | Pretreatment of anodization of valve metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS644491A true JPS644491A (en) | 1989-01-09 |
Family
ID=15714247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16040687A Pending JPS644491A (en) | 1987-06-26 | 1987-06-26 | Pretreatment of anodization of valve metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS644491A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0407349A2 (en) * | 1989-06-30 | 1991-01-09 | Eltech Systems Corporation | Electrode for use in electrolytic processes and process for manufacturing it |
| US5215606A (en) * | 1988-08-15 | 1993-06-01 | Zivaco, Co., Ltd. | Method for preparing decorative lacquered Ti-based articles |
| EP0592892A1 (en) * | 1992-10-12 | 1994-04-20 | Itb S.R.L. | Process for continuous titanium sheet pickling and passivation without using nitric acid |
| CN111826700A (en) * | 2020-07-27 | 2020-10-27 | 上海市特种设备监督检验技术研究院 | Pickling passivation combined solution for anodizing treatment of titanium material and pickling passivation method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62109998A (en) * | 1985-11-07 | 1987-05-21 | Kobe Steel Ltd | Pretreatment of valve metal before anodic oxidation |
-
1987
- 1987-06-26 JP JP16040687A patent/JPS644491A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62109998A (en) * | 1985-11-07 | 1987-05-21 | Kobe Steel Ltd | Pretreatment of valve metal before anodic oxidation |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5215606A (en) * | 1988-08-15 | 1993-06-01 | Zivaco, Co., Ltd. | Method for preparing decorative lacquered Ti-based articles |
| EP0407349A2 (en) * | 1989-06-30 | 1991-01-09 | Eltech Systems Corporation | Electrode for use in electrolytic processes and process for manufacturing it |
| EP0592892A1 (en) * | 1992-10-12 | 1994-04-20 | Itb S.R.L. | Process for continuous titanium sheet pickling and passivation without using nitric acid |
| CN111826700A (en) * | 2020-07-27 | 2020-10-27 | 上海市特种设备监督检验技术研究院 | Pickling passivation combined solution for anodizing treatment of titanium material and pickling passivation method |
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