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Phosphate Inhibition Effect on Chloride-Induced Crevice Corrosion of Alloy 22

Published online by Cambridge University Press:  28 March 2012

Marcela Miyagusuku
Affiliation:
Comisión Nacional de Energía Atómica, ARGENTINA
Ricardo M. Carranza
Affiliation:
Comisión Nacional de Energía Atómica, ARGENTINA Instituto Sabato, UNSAM/CNEA, ARGENTINA
Raul B. Rebak
Affiliation:
GE Global Research, Schenectady, NY, USA
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Abstract

Alloy 22 has been extensively studied regarding its crevice corrosion (CC) resistance both in pure chloride solutions and in solutions containing different oxyanions that may act as inhibitors of crevice corrosion. The scope of this work was to study the general and localized corrosion behavior of Alloy 22 when phosphate ions were added to a 1 M NaCl solution at 90°C. Results from the electrochemical tests indicate that the size of the passive potential range and the localized corrosion repassivation potential value increased in the presence of phosphate ions. Results from creviced specimens showed a strong inhibition effect of phosphate ions on the chloride induced crevice corrosion of Alloy 22. The critical molar concentration ratio (RCRIT = [phosphate]/[Cl]) to inhibit crevice corrosion was 0.3.

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Copyright
Copyright © Materials Research Society 2012

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References

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