Thermodynamic Calculation of the Critical Potentials of the Selective Dissolution of AgAu and CuAu Alloys

A. E. Kutyrev and Yu. Ya. Andreev

Moscow State Institute of Steel and Alloys, Leninskii pr. 4, Moscow, 119049 Russia

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Received August 11, 2006

Abstract — A thermodynamic approach to estimating the critical potential of the selective alloy dissolution E_c at a vacancy concentration N_(s) in the superficial layer is considered. The N_(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 concentra-tion of vacancies N_(s)10², 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_cN_Au functions for Ag–Au and Cu–Au alloys satisfactorily coincide with the experimental dependences.

PACS numbers: 68.35.Md