The Role of Passivity in the Mechanism of Stress-Corrosion Cracking and Metal Dissolution of 18Cr-8Ni Stainless Steels in Boiling Magnesium and Lithium Chlorides
- 1 January 1971
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 118 (11) , 1717-1725
- https://doi.org/10.1149/1.2407824
Abstract
Electrochemical polarization measurements conducted on Type 304 stainless steel in boiling lithium chloride have shown that the alloy exists in a stable state of passivity. Similar investigations in boiling magnesium chloride indicated a stable passive state, but the data were more ambiguous than the lithium chloride data because of the effect of pitting corrosion.Controlled potential corrosion studies and microchemical analysis in boiling magnesium and lithium chloride have indicated that Type 304 stainless steel is in a passive state at the potential where the alloy cracks under freely corroding conditions. Further, cation partial current density curves have shown clearly that nickel enrichment does not take place in either corrodent at the corrosion potential. The data presented strongly support the film‐rupture model (slip‐step dissolution) of crack initiation.Keywords
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