Critical Potential of the Surface Development of Ag
Au Alloys
A. V. Vvedenskii, O. V. Koroleva, and O. A. Kozaderov
Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russia
E-mail: Этот e-mail защищен от спам-ботов. Для его просмотра в вашем браузере должна быть включена поддержка Java-script
Received August 8, 2006
Abstract—Based on the model taking into account the appearance of a morphological instability and the evolution of a surface with time during the selective anodic dissolution of a homogeneous A–B alloy with the predominant content of the electrochemically negative metal A, equations for the critical potential Ecr and over potential 
cr of the surface development are derived. Criteria of the nature of chemical hindrances of the selective dissolution in the over-critical range are formulated. The Ecr and cr values corresponding to the breakage of the morphological stability of the A–B alloy surface (with the atomic silver part XAg = 0.65 to 0.95) in an acidicnitrate solution containing diverse amounts of silver ions (10
4 to 10
2 M) are experimentally found. The character of the effect of the atomic gold content in the alloy and the concentration of silver ions in the solution oncr and Ecr values of the alloys is determined. The nature of the kinetic limitations of the selective dissolution in the over-critical potential range is clarified.
cr of the surface development are derived. Criteria of the nature of chemical hindrances of the selective dissolution in the over-critical range are formulated. The Ecr and cr values corresponding to the breakage of the morphological stability of the A–B alloy surface (with the atomic silver part XAg = 0.65 to 0.95) in an acidicnitrate solution containing diverse amounts of silver ions (104 to 102 M) are experimentally found. The character of the effect of the atomic gold content in the alloy and the concentration of silver ions in the solution oncr and Ecr values of the alloys is determined. The nature of the kinetic limitations of the selective dissolution in the over-critical potential range is clarified.
PACS numbers: 82.45.Q
DOI: 10.1134/S0033173208010025