Abstract
Annealed gold wires were loaded at 0 mV vs. SCE. The specimens were then polarized during 1 min intervals to successively more negative potentials ranging from −200 to −1800 mV in steps of 200 mV. The extra strains measured as a function of the electrode potential had a characteristic distribution depending on the composition, oxygen content, and pH of the test solution. In general there are two peaks. In deaerated alkaline solutions a first peak occurred between −200 and −600 mV. This peak was completely absent in deaerated acid solutions. It is ascribed to dislocation pinning at the metal surface by chemisorbed OH− ions during loading of the specimen. A first peak probably due to adsorbed reappears in oxygenated acid solutions. A second peak was observed in all test solutions. This peak occurs at electrode potentials more negative than −1000 mV vs. SCE.
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