Abstract
A model of electrochemical processes near a crack tip in a stressed metal subjected to corrosion with hydrogen depolarization is suggested. It is shown that, in order to describe the kinetics of hydrogenation of the prefracture area, it is necessary to take into account the type of passivation layer on the newly formed metal surface near the crack tip and the mechanism of its formation. The model was applied to an iron-water system whose pH value is lower than that of hydrate formation. As a result, we determined the nonstationary potential of the metal-electrolyte interface as a function of the parameters of the stress-strain state near a crack tip and characteristics of the metal.
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