Abstract
We have studied the corrosion of copper single crystals as a function of applied anodic potential when the metal was cycled in deaerated 0.1 M HClO 4, i.e. an aqueous environment which prevented the formation of oxide films. The behavior has been studied both in the presence and absence of cycling. The dominant corrosion fatigue mechanism under these conditions is preferential dissolution of PSB's. Some temporary preferential dissolution also occurs during rapid hardening, but if saturation is obtained below the region of the plateau in the cyclic stress-strain curve, then the corrosion becomes uniform. Crystals containing PSB's, but not simultaneously cycled, show preferential dissolution only over a very narrow range of anodic potential. Cycling acts to widen that range and to intensify the preferential dissolution. We believe that the main cause of preferential dissolution is the heightened activity of fresh surfaces created in the active bands.
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