Whitney Award Lecture—1985: On The Roles of Corrosion Products in Local Cell Processes
Author:
- 1 March 1986
- journal article
- Published by Association for Materials Protection and Performance (AMPP) in Corrosion
- Vol. 42 (3) , 125-140
Abstract
This paper reviews work performed in the author’s laboratory on the roles that corrosion products play in corrosion and materials degradation processes. Subject areas include the following: (1) wedging action, in which the tensile stresses required for crack propagation are generated by the formation of solid corrosion products within the crack cavity; (2) gas bubble formation and coalescence that eventually fills a major volume segment of a pit, crevice, or crack; (3) an experimental determination and mathematical modeling of the local electrode potential and solution composition existing within active pits and crevices; (4) an analysis that shows the existence of a limiting electrode potential (ELIM) in a cavity and defines its value; (5) and an analysis based on the ELIM concept and on known trends in concentrations of ionic species that provides a means for distinguishing between stress corrosion cracking (SCC) and hydrogen cracking (HC) in noble metal alloys.Keywords
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