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Report No.

Corrosion of structural materials and electrochemistry in high-temperature water; Relationships among water chemistry, corrosion, oxide film and electrochemical corrosion potential

Uchida, Shunsuke; Hanawa, Satoshi ; Kysela, J.*; Lister, D. H.*

In order to establish reliable NPP operation, each plant requires its own unique optimal water chemistry control based on careful consideration of its system, materials and operational history. Electrochemistry is one of key issues that determine corrosion related problems, e.g., FAC. Based on the relationships among ECP, metal surface conditions and exposure time, a model to evaluate ECP and corrosion rate of steel was developed by coupling an electrochemical model and an oxide layer growth model. Major conclusions are as follows. (1) The effects of water chemistry improvement and mass transfer coefficients due to local flow velocity on FAC wall thinning rate and ECP could be evaluated with the proposed model. (2) The effects of H$$_{2}$$O$$_{2}$$ and O$$_{2}$$ concentrations on ECP were evaluated with the model. Exposure time dependent ECPs were also explained as the effects of oxide film growth on the specimens. (3) Decreases in ECP due to neutron exposure were explained by radiation-induced diffusion in the oxide layers.



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