PREVENTION OF HYDROGEN DEGRADATION IN TITANIUM BY DEPOSITION OF TIN THIN-FILM

This paper describes the effects of using a TiN film as a possible pro tection layer for titanium in an aggressive chemical environment. The TiN film as a barrier of hydrogen permeation into the material was eva luated by electrochemical cathodic charging of the specimens in soluti ons with different pH values and temperatures. Results revealed that t he thickness of hydride on the surface of the uncoated titanium increa sed with the increase of charging time. Higher charging temperature an d lower pH value promoted the formation of hydride phases. For titaniu m coated with a TiN film, it effectively retarded the permeation of hy drogen into the titanium substrate, However, this was at the sacrifice of the TiN film itself.