JPS644490A - Anodic oxidation for valve metal with coarse crystalline grain - Google Patents

Anodic oxidation for valve metal with coarse crystalline grain

Info

Publication number
JPS644490A
JPS644490A JP15630087A JP15630087A JPS644490A JP S644490 A JPS644490 A JP S644490A JP 15630087 A JP15630087 A JP 15630087A JP 15630087 A JP15630087 A JP 15630087A JP S644490 A JPS644490 A JP S644490A
Authority
JP
Japan
Prior art keywords
anodic oxidation
valve metal
voltage
coarse crystalline
crystalline 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.)
Granted
Application number
JP15630087A
Other languages
Japanese (ja)
Other versions
JPH036238B2 (en
Inventor
Hidetoshi Yamaguchi
Kenji Miki
Koji Kanechika
Hiroshi Sato
Kazutoshi Shimogoori
Makoto Tanabe
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 JP15630087A priority Critical patent/JPS644490A/en
Publication of JPS644490A publication Critical patent/JPS644490A/en
Publication of JPH036238B2 publication Critical patent/JPH036238B2/ja
Granted legal-status Critical Current

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  • Physical Vapour Deposition (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

PURPOSE:To form a uniform colored oxide film with superior reproducibility, by raising the voltage of a valve metal with coarse crystalline grains up to the prescribed value by means of constant electric current with a specific current density and then carrying out anodic oxidation at the above prescribed voltage. CONSTITUTION:A valve metal such as Ti, Ta, Zr, and alloys containing the above elements is subjected to coarsening of crystalline grains by means of vacuum annealing, etc., and then to anodic oxidation in an Na2HPO4 solution, etc. In the anodic oxidation method for the valve metal containing the above coarse crystalline grains, the voltage is raised up to the prescribed value by means of a constant electric current of 1.2-20A/dm<2> and then anodic oxidation is carried out at the above-mentioned prescribed voltage. By this method, an oxide film presenting a colored appearance due to the optical interference of reflected light can be formed on the metal surface, and further, a film of uniform coloring can be obtained with superior reproducibility by the above method.
JP15630087A 1987-06-23 1987-06-23 Anodic oxidation for valve metal with coarse crystalline grain Granted JPS644490A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15630087A JPS644490A (en) 1987-06-23 1987-06-23 Anodic oxidation for valve metal with coarse crystalline grain

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15630087A JPS644490A (en) 1987-06-23 1987-06-23 Anodic oxidation for valve metal with coarse crystalline grain

Publications (2)

Publication Number Publication Date
JPS644490A true JPS644490A (en) 1989-01-09
JPH036238B2 JPH036238B2 (en) 1991-01-29

Family

ID=15624795

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15630087A Granted JPS644490A (en) 1987-06-23 1987-06-23 Anodic oxidation for valve metal with coarse crystalline grain

Country Status (1)

Country Link
JP (1) JPS644490A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103498182A (en) * 2013-09-18 2014-01-08 上海大学 Preparation method of titanium dioxide nanotube array with orientation structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103498182A (en) * 2013-09-18 2014-01-08 上海大学 Preparation method of titanium dioxide nanotube array with orientation structure

Also Published As

Publication number Publication date
JPH036238B2 (en) 1991-01-29

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees