Effect of Thiosulfate Ions on the Electrochemical Behavior of Alloy 800

The effect of thiosulfate ions on the electrochemical behavior of alloy 800 (UNS N08800, ASTM B409) was investigated in simulated neutral steam generator crevice solutions by using electrochemical noise, potentiodynamic polarization and potentiostatic polarization techniques. The results showed that...

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Bibliographic Details
Published inInternational journal of electrochemical science Vol. 8; no. 8; pp. 10335 - 10349
Main Authors Fu, Congwei, Wang, Jihui, Wang, Huihui, Wang, Ke
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2013
Subjects
alloy 800
chloride
electrochemical behavior
passive film
thiosulfate
electrochemical behavior
chloride
alloy 800
thiosulfate
passive film
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Summary:The effect of thiosulfate ions on the electrochemical behavior of alloy 800 (UNS N08800, ASTM B409) was investigated in simulated neutral steam generator crevice solutions by using electrochemical noise, potentiodynamic polarization and potentiostatic polarization techniques. The results showed that the noise resistance, corrosion potential, breakdown potential and passive range of alloy 800 in the solution containing thiosulfate and chloride ions were lower than that in solution containing thiosulfate or chloride ions alone, whereas the steady state current density of alloy 800 in thiosulfate and chloride containing solution was larger than that in solution containing only thiosulfate or chloride ion. Under the synergistic effect of S2O32- and Cl- ions, chloride and thiosulfate ions could be successively absorbed into the alloy surface, impeded the passivation of alloy 800 and decreased the corrosion resistance of alloy 800.
ISSN:1452-3981
1452-3981
DOI:10.1016/S1452-3981(23)13114-2