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

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

doi:10.2355/tetsutohagane1955.89.8_833

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 journal › Article › peer-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 language	English
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	https://doi.org/10.2355/tetsutohagane1955.89.8_833
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

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Environmental and metallurgical factors affecting discoloration of titanium sheets in atmospheric environments. / Kaneko, Michio; Takahashi, Kazuhiro; Hayashi, Teruhiko; Muto, Izumi; Tokuno, Kiyonori; Kimura, Kinichi.

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 89, No. 8, 08.2003, p. 833-840.

Research output: Contribution to journal › Article › peer-review

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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.",

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AU - Kaneko, Michio

AU - Takahashi, Kazuhiro

AU - Hayashi, Teruhiko

AU - Muto, Izumi

AU - Tokuno, Kiyonori

AU - Kimura, Kinichi

PY - 2003/8

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N2 - 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.

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

Abstract

Keywords

ASJC Scopus subject areas

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