Abstract
A thermodynamic approach to estimating the critical potential of the selective alloy dissolution E c at a vacancy concentration N v(s) in the superficial layer is considered. The N v(s) dependence on the potential and the concentration of gold N Au in the alloy is calculated. The E c potential corresponds to the critical concentration of vacancies N v(s) ≈ 10−2, and the E c value itself is determined chiefly by the zero-point potential of the alloy, which is a pronounced function of the surface enrichment in gold. The calculated E c-N Au functions for Ag-Au and Cu-Au alloys satisfactorily coincide with the experimental dependences.
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