By assuming that the electrochemical oxidation mechanism of crack propagation is not supplemented by mechanical fracture or plastic deformation during the early stages of crack growth and that the equilibrium rate of a charge transfer half-reaction, occurring at the interface between two phases, is dependent upon the local surface tension at the point of reaction, it is possible to satisfactorily account for the following general aspects of stress corrosion cracking: (1) the existence of an incubation period, (2) the existence of a threshold stress, (3) the variation of incubation time with overpotential, (4) the variation of incubation time with applied stress.

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