Environmental and metallurgical factors affecting discoloration of titanium sheets in atmospheric environments

Michio Kaneko, Kazuhiro Takahashi, Teruhiko Hayashi, Izumi Muto, Kiyonori Tokuno, Kinichi Kimura

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Effects of air bone salts, ultra violet (UV) irradiation, acid rain, impurity elements and TiC precipitated in surface layers of titanium on discoloration of titanium sheets were investigated to clarify the mechanism of discoloration of titanium in atmospheric environments. Air bone salts and UV irradiation did not enhance discoloration of titanium, but synthetic acid rain below pH 4.5 induced discoloration. The discoloration was largely enhanced by precipitation of TiC in surface layers of titanium sheets. It is considered that dissolved Tin+ from TiC by acid rain would deposit on titanium surface, inducing interferential color. Resistance to discoloration evaluated in accelerated discoloration tests was found to be remarkably improved by decreasing precipitation of TiC in surface layers of titanium sheets.

Original languageEnglish
Pages (from-to)833-840
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume89
Issue number8
DOIs
Publication statusPublished - 2003 Aug
Externally publishedYes

Keywords

  • Acid rain
  • Atmospheric corrosion
  • Discoloration
  • Titanium
  • Titanium carbide

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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