|Author||Seshadri, G. ♦ Bower, K. A. ♦ Brooks, R. W. ♦ Kelber, J. A.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||MATERIALS SCIENCE ♦ CHROMIUM STEELS ♦ CORROSION ♦ IRON ♦ SODIUM COMPOUNDS ♦ SULFITES ♦ CORROSIVE EFFECTS ♦ PASSIVATION ♦ CHROMIUM OXIDES ♦ CORROSION RESISTANCE|
|Abstract||The authors have examined the electrochemical behavior of tin-free steel chromium type (TFS-CT) and polycrystalline iron electrodes in sodium bisulfite containing Perchlorate and nitrate solutions. Their experiments indicate that TFS-CT corrodes on exposure to sodium bisulfite. The extent to which passivation is prevented depends on the supporting electrolyte. A very interesting feature that the authors have observed is that TFS-CT exhibits a ``memory`` of exposure to sodium bisulfite, in that it does not repassivate when subsequently cycled in a bisulfite-free supporting electrolyte. This ``memory effect`` and the extent of corrosion depend on the supporting electrolyte used. Polycrystalline iron electrodes on the other hand, corrode on exposure to sodium bisulfite, but repassivate when returned to a supporting electrolyte that is free of bisulfite. The results indicate that bisulfite attacks the protective chrome oxide coating partially or completely, inhibiting subsequent passivation even in bisulfite-free electrolytes. The results also indicate that reactions of the bisulfite exposed surface with Perchlorate or nitrate anions significantly affect corrosion behavior.|
|Learning Resource Type||Article|
|Publisher Place||United States|
|Journal||Journal of the Electrochemical Society|
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