The present paper investigates the effect of chloride and sulfate additions on corrosion of low-alloyed steel in a cladding flaw of a nuclear reactor pressure vessel using in-situ electrochemical impedance spectroscopy coupled to ex-situ characterization of the oxides by surface analytical techniques. Impedance data are interpreted by the mixed-conduction model for oxide films to yield estimates for the main kinetic and transport parameters of the corrosion process. It can be concluded that the effect of chloride/sulfate transients on low-alloyed steel oxides is moderate, concerns mostly the processes at the inner layer/coolant interface and is to a certain extent reversible.
- low-alloyed steel
- high-tempereature water
- chloride and sulfate additions
- impedance spectroscopy
- kinetic model
Sipilä, K., Bojinov, M., Mayinger, W., Saario, T., & Stanislowski, M. (2015). Effect of chloride and sulfate additions on corrosion of low alloy steel in high-temperature water. Electrochimica Acta, 173, 757-770. https://doi.org/10.1016/j.electacta.2015.05.137