JPS644491A - Pretreatment of anodization of valve metal - Google Patents

Pretreatment of anodization of valve metal

Info

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
Application number
JP16040687A
Other languages
Japanese (ja)
Inventor
Hidetoshi Yamaguchi
Kenji Miki
Koji Kanechika
Hiroshi Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP16040687A priority Critical patent/JPS644491A/en
Publication of JPS644491A publication Critical patent/JPS644491A/en
Pending legal-status Critical Current

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.
JP16040687A 1987-06-26 1987-06-26 Pretreatment of anodization of valve metal Pending JPS644491A (en)

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)

* Cited by examiner, † Cited by third party
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 and passivating combined liquid for anodizing titanium material and pickling and passivating method

Citations (1)

* Cited by examiner, † Cited by third party
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

Patent Citations (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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 and passivating combined liquid for anodizing titanium material and pickling and passivating method

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