Woon Suk Hwang1, Katsuhiko Mushiake2 and Noboru Masuko2
1Graduate Student, The University of Tokyo, Tokyo
The self-activation of passivated titanium was investigated in a sulfuric acid solution. The stability of the anodically formed film on a titanium surface was measured under several values of applied current densities ranging from cathodic to anodic. The reduction process of the film was affected additively by the applied current. Under various conditions two kinetic parameters, the amount of the charge accumulated in the film, Qo, and the rate of the self-activation process, io, were obtained with the linear relationship between density of the applied current and the inverse value of the activation time. The linear variation of Qo with the passivation potential (1.85×10 C•m-2•V-1) is attributed to the formation of a barrier-type film. The values of io depend on the conditions, by which the values of Qo are not affected, such as pH of the solution and passivation time. This result is explained in terms of the presence of defect in the films.
corrosion, titanium, passivation, barrier-type film, self-activation, sulfuric acid
Please do not copy without permission.