Abstract
The effects of coarsening of porosity within dealloyed layers have been investigated from the viewpoint of the film-induced cleavage model of SCC. Tensile tests and pore coarsening measurements of Ag-20 at%Au foils were carried out in 1 M HClO 4 at room temperature. Upon ageing at potentials above 550 mV(SCE), the ability of a brittle crack to penetrate into the substrate was destroyed quickly due to rapid pore coarsening. At low potentials brittle behaviour persisted for up to 2 h. Chloride ions accelerated the coarsening and pyridine retarded it. The observed time dependence of the coarsening indicates that it occurs by the surface diffusion of Au atoms and is affected by the specific adsorption of ions or molecules.
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