The Initial Stage in the Anodic Dissolution
of CopperGold Alloys in Chloride and Sulfate Solutions

A. V. Vvedenskii and I. K. Marshakov

Voronezh State University, Voronezh, 394893 Russia

Received September 21, 1995

Abstract—Prior to emergence of diffusion limitations in a solution or an alloy, but after attaining equilibrium
by the first single-electron stage of charge transfer, the initial stage in dissolution of copper and copper–gold
alloys (4 to 50 at. % of Au) is limited by surface diffusion of copper adatoms between linear atomic steps both
in sulfate and chloride solutions. Copper atoms emerge from semicrystalline or kink-positions at a greater but
comparable rate. Mobility of adatoms decreases with the growing gold concentration, which is attributed to
specificity of interactions between atoms in the alloy crystal lattice. The Cl^– anions directly participate in a cop-
per ionization act, which noticeably accelerates surface diffusion of adatoms in chloride solutions compared
with sulfate solutions.

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