Abstract
Analyzing the stationary current—potential curves with an original simplified reaction scheme of the dissolution—passivation of titanium, we have determined the partial reaction orders of the elementary rate determining steps of the mechanism. The discussion of a negative order with respect to H + ions observed for the passivation electrochemical reaction leads to propose a modified reaction scheme including two passivation paths, one of the two implying the tetravalent oxide TiO 2, responsible of the stable passivity.
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