Abstract
The nature of corroding titanium surfaces and the meaning of polarization resistance were discussed based on the dual barrier model, and electrochemical measurements of titanium corrosion in sulfuric acids were carried out. It was confirmed from the experimental results that titanium dissolved in acid solution as trivalent ion. The corrosion potential of titanium was in a potential region which, although belonging to the active dissolution region, was close to the passive region, indicating a strong resistivity of the metal to corrosion. Analyses were made for the corrosion rate of titanium using various electrochemical methods. Among them, the polarization resistance measurement gave a fairly good estimation of the corrosion rate. A polarization resistance method was also proposed, which enabled small potential jumps produced by small current steps to be measured in a very short time interval without causing any significant changes of the surface conditions of titanium.
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