Abstract

This paper describes a new process to obtain a coating having very high titanium content and high corrosion resistance on iron substrate.The process was to conduct electroplating of nickel or copper on the iron substrate previous to the titanium vapor-plating. The intermediate layer acted as a barrier to prevent iron from diffusing into the titanium layer so that the purity of titanium in the surface layer was kept at a very high level.The concentration of titanium in the vapor-plated layer was confirmed to be above 95% by measurement with an X-ray microanalyzer. Whereas, the concentration in the conventional vaporplatings with no intermediate layer was 30-70%.Corrosion resistance of the specimens treated by this process showed excellent results by testing in various corrosive solutions.

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