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 language | English |
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Pages (from-to) | 833-840 |
Number of pages | 8 |
Journal | Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan |
Volume | 89 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2003 Aug |
Externally published | Yes |
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