Abstract
The morphologies of corrosion pits produced during cyclic deformation have been studied in copper single crystals exposed to corrosion, and by exposing previously cycled specimens to the same corrosive environment (0.1 M HClO 4), but without cycling. When the previously deformed metal was corroded without cycling, pits formed at moderate and high anodic potentials with 111 facets, and two morphologies were observed; regular octahedral pits with pointed bottoms and others with flat 100 bottoms. The existence of the flat-bottomed pits was justified thermodynamically, and the sharp bottomed pits developed from the other kind because of the mechanism and kinetics of the growth process. The corrosion pits produced during cyclic deformation were not of the conventional octahedral type and showed 110 and 111 facets. The slip steps caused by the cyclic deformation reduced the differences in specific surface energies of the facets, and stimulated the growth kinetics.
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