The main electrochemical requirement for a dissolution-controlled cracking mechanism is considered to be a critical delay in the repassivation time during which a certain coulombic charge flows. The strain rate at the crack tip and the repassivation rate are in a permanent critical state of imbalance. After consideration of this model the highly localized attack is considered with respect to (a) a pre-existing path, and (b) a strain-generated path. The problems of discerning that cracking occurs by a dissolutioncontrolled mechanism are discussed.
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