Corrosion of Alloy 690 in Simulated Steam Generator Crevices: Effect of Applied Potential, pH and Pb Addition
Iva Betova, Martin Bojinov, Tiina Ikäläinen, Timo Saario, Konsta Sipilä
Abstract
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.
Topics & Concepts
CorrosionDielectric spectroscopyAlloyMaterials scienceAnodeElectrochemistryCyclic voltammetryAnalytical Chemistry (journal)X-ray photoelectron spectroscopyMetallurgyChemistryElectrodeChemical engineeringPhysical chemistryEnvironmental chemistryEngineeringHydrogen embrittlement and corrosion behaviors in metalsCorrosion Behavior and InhibitionHigh-Temperature Coating Behaviors