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Anionic and Cationic Effects on the Crevice Corrosion Susceptibility of Alloy 22

Published online by Cambridge University Press:  15 February 2011

Ricardo M. Carranza  and
Raul B. Rebak
Ricardo M. Carranza
Affiliation:
Dep. Materiales, Comision Nacional de Energia Atomica Instituto Sabato, Universidad Nacional de San Martin / CNEA Av. Gral. Paz 1499, B1650KNA San Martin, Buenos Aires, ARGENTINA
Raul B. Rebak
Affiliation:
GE Global Research, 1 Research Circle, CEB2505, Schenectady, NY 12309, USA
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Abstract

Alloy 22 is highly resistant to all forms of corrosion; however, it may suffer crevice corrosion in presence of chloride ions especially at temperatures higher than ambient and at anodic potentials. The susceptibility of Alloy 22 to suffer crevice corrosion is highly dependent on the type of electrolyte solution that is in contact with the alloy including variety of species in solution and their relative concentration. Laboratory research has shown that at a constant chloride concentration, the susceptibility of Alloy 22 to crevice corrosion is not influenced by the nature of the cations present in solution. On the other hand, that nature of the anions is highly influential. Of the anions present in ground water, only chloride is detrimental and the others are inhibitors or innocuous for crevice corrosion susceptibility. That is, the presence of the other anions counter balances the negative effect of chloride. The inhibition effect is explained and the likelihood that Alloy 22 would suffer crevice corrosion in contact with ground water is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1193: Scientific Basis for Nuclear Waste Management XXXIII , 2009 , 569
Copyright
Copyright © Materials Research Society 2009

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