Anodic oxidation of Ag-Cu alloys in sulfuric acid solutions when reaction products are unstable

Based on the impedance models of porous layer, anodic behavior of silver as a component of Ag-Cu alloys in aqueous sulfuric acid solutions is analyzed. It is shown that, in order to adequately describe the electrochemical process, chemical decomposition of superficial passivating silver-sulfate layer should be taken into account. Decomposition rate constants of the layer on silver-copper alloys of diverse composition are calculated. Original Russian Text ? A.V. Noskov, E.P. Grishina, A.M. Pimenova, 2008, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2008, Vol. 44, No. 4, pp. 374–377.