TITLE

Critical potential of the surface development of Ag-Au alloys

AUTHOR(S)
Vvedenskii, A.; Koroleva, O.; Kozaderov, O.
PUB. DATE
January 2008
SOURCE
Protection of Metals;Jan2008, Vol. 44 Issue 1, p22
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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 E cr and overpotential ηcr 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 E cr and ηcr values corresponding to the breakage of the morphological stability of the A-B alloy surface (with the atomic silver part X Ag = 0.65 to 0.95) in an acidic nitrate 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 on ηcr and E cr values of the alloys is determined. The nature of the kinetic limitations of the selective dissolution in the over-critical potential range is clarified.
ACCESSION #
28687532

 

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