Abstract
A relationship is considered between a corrosion crack and a corrosion crevice as geometrical objects in which electrochemical processes occur. A model scheme is proposed for a corrosion crack or crevice, and it is shown that the geometrical factor represented by the characteristic width (opening) Δ* of a corrosion crack in the blind part, for which the corrosion rate is maximal, can be decisive in stress corrosion cracking in metals and alloys. A phenomenological criterion is proposed for the onset of corrosion cracking, which is used in a method of calculating the threshold stress intensity coefficient KIscc, which incorporates the corrosion-process parameters in the prefailure zone. Experimental and calculated data are compared, which confirms the approach.
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