On the Roles of Corrosion Products in Local Cell Processes.
Annual technical rept.,
PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MATERIALS SCIENCE AND ENGINEERING
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This paper reviews work performed on the roles that corrosion products play in corrosion and materials degradation processes. Subject areas include 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, E sub LIM, in a cavity and defines its value 5 an analysis based on the E sub LIM concept and on known trends in concentrations of ionic species that provides a means for distinguishing between stress corrosion and hydrogen cracking in noble metal alloys.
- Properties of Metals and Alloys