Effect of Water Density/Pressure on the Corrosion Behavior of 304 and 310 Stainless Steels
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Two stainless steels, AISI 304 and 310, are evaluated for their oxidation behavior in low-pressure steam (0.1 MPa), subcritical water (8 MPa) and supercritical water (29 MPa) at 625 °C for 1000 h. The water density is found to have a significant effect on both the weight change per unit surface area, oxide structure and thickness. Under low-pressure steam condition, very little weight change and limited oxide scale formation are observed on both steels while exposure to subcritical water results in excessive oxide formation and weight gain. With further increase in pressure to supercritical condition, a denser oxide layer near the 310 substrate is formed, decreasing the oxidation rate. However, this oxidation decreased is not significant on 304 tested under supercritical condition. No proportional relationship between the oxidation rate and water pressure is observed.
KeywordsSupercritical water Subcritical water Steam SCWR Weight change Cross section Microstructure SEM
Funding to the Canada Gen-IV National Program was provided by Natural Resources Canada through the Office of Energy Research and Development, Atomic Energy of Canada Limited and Natural Sciences and Engineering Research Council of Canada (NSERC).
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