Corrosion of Alloy 690 in Simulated Steam Generator Crevices: Effect of Applied Potential, pH and Pb Addition

The mechanism of general corrosion of Alloy 690 in simulated steam generator crevices is investigated by voltammetry, electrochemical impedance spectroscopy and slow strain rate tests, combined with ex-situ characterization of the oxides using X-ray photoelectron and Glow-discharge optical emission...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2022-02, Vol.169 (2), p.21502
Main Authors: Betova, Iva, Bojinov, Martin, Ikäläinen, Tiina, Saario, Timo, Sipilä, Konsta
Format: Article
Language:English
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Summary:The mechanism of general corrosion of Alloy 690 in simulated steam generator crevices is investigated by voltammetry, electrochemical impedance spectroscopy and slow strain rate tests, combined with ex-situ characterization of the oxides using X-ray photoelectron and Glow-discharge optical emission spectroscopies. Quantitative interpretation of impedance spectra with the Mixed-Conduction Model furnishes estimates of kinetic and transport parameters of the corrosion and anodic oxidation processes. The results indicate a beneficial effect of Pb addition on general corrosion regardless of crevice solution composition.
ISSN:0013-4651
1945-7111
DOI:10.1149/1945-7111/ac4f26