COLORED PURE TITANIUM OR TITANIUM ALLOY HAVING LOW SUSCEPTIBILITY TO DISCOLORATION IN ATMOSPHERIC ENVIRONMENT

摘要

This invention provides a colored pure titanium or titanium alloy having low susceptibility to discoloration in an atmospheric environment that, even when titanium is used in a severe acidic rain environment such as roofs and wall materials, has excellent anti-discoloration properties and does not undergo a deterioration in the level of design over a long period of time. The colored pure titanium or titanium alloy having low susceptibility to discoloration in an atmospheric environment is a colored titanium produced by anode oxidation and is characterized in that the average phosphorus content in a range of 40 nm from the surface of a titanium oxide layer formed on the surface of titanium is not more than 5.5 atomic% and the average carbon content in a depth range of 100 nm from the surface of titanium is 3 to 15 atomic%.