Title:
TITANIUM MATERIAL LESS SUSCEPTIBLE TO DISCOLORATION AND METHOD FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2002/010481
Kind Code:
A1
Abstract:
A titanium material less susceptible to discoloration in the atmosphere, characterized in that an oxide skin film present on the surface thereof is reduced in fluorine content and, preferably also in carbon content and/or in the thickness of the film; and a method for producing the titanium material which comprises dissolving the surface of the titanium material with a mixed aqueous solution of hydrofluoric acid and nitric acid having a nitric acid concentration of 80 g/l or less, or which comprises dissolving the surface of the titanium material with a mixed aqueous solution of hydrofluoric acid and nitric acid and then subjecting the surface to a heat treatment at 300 to 900 ° under vacuum or in an inert gas atmosphere.
Inventors:
TAKAHASHI KAZUHIRO (JP)
HAYASHI TERUHIKO (JP)
KANEKO MICHIO (JP)
TOKUMO KIYONORI (JP)
TAMENARI JUNICHI (JP)
KIMURA KINICHI (JP)
HAYASHI TERUHIKO (JP)
KANEKO MICHIO (JP)
TOKUMO KIYONORI (JP)
TAMENARI JUNICHI (JP)
KIMURA KINICHI (JP)
Application Number:
PCT/JP2001/006302
Publication Date:
February 07, 2002
Filing Date:
July 19, 2001
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
TAKAHASHI KAZUHIRO (JP)
HAYASHI TERUHIKO (JP)
KANEKO MICHIO (JP)
TOKUMO KIYONORI (JP)
TAMENARI JUNICHI (JP)
KIMURA KINICHI (JP)
TAKAHASHI KAZUHIRO (JP)
HAYASHI TERUHIKO (JP)
KANEKO MICHIO (JP)
TOKUMO KIYONORI (JP)
TAMENARI JUNICHI (JP)
KIMURA KINICHI (JP)
International Classes:
C22C14/00; C23C30/00; C22F1/02; C22F1/18; C23C8/02; C23C8/10; C23G1/10; (IPC1-7): C23G1/02
Foreign References:
| JP2000001729A | 2000-01-07 |
Other References:
See also references of EP 1306468A4
None
None
Attorney, Agent or Firm:
Tamura, Hiroaki c/o Halifax, Asakusabashi Building 3rd Floor 1-1 (Asakusabashi 3-chome Taito-ku Tokyo, JP)
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