| 摘要 |
PROBLEM TO BE SOLVED: To provide pure titanium or a titanium alloy which shows excellent discoloration resistance even when used in such a roof and a wallplate as to be used in a hostile environment of acid rain, does not degrade design characteristics for a long period of time, and hardly causes discoloration in the atmospheric environment. SOLUTION: The titanium or titanium alloy which hardly causes discoloration in the atmospheric environment has a titanium nitride layer with a thickness of 0.1 to 1.5μm formed on the surface of the pure titanium or titanium alloy, wherein the titanium nitride layer contains 1 to 35 atom% oxygen by average in the whole layer, and 3 to 15 atom% carbon by average in a region between the titanium surface and a 100 nm deep position therefrom. COPYRIGHT: (C)2006,JPO&NCIPI
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