Effect of Pressures on the Corrosion Behaviours of Materials at 625°C
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The corrosion behaviors of austenitic stainless steels (SS) 310, 304 and Ni- and Fe-based A-286 exposed to 0.1 MPa, 8 MPa and 29 MPa at 625°C for 1000 h were investigated. These represent exposure to superheated steam, subcritical and supercritical water (SCW) at 625°C, respectively. As SS 310 showed the smallest weight change, the oxide cross-sections made from 310 samples were examined by transmission electron microscopy. The results revealed a single-layer oxide at 0.1 MPa and dual-layer oxides at 8 MPa and 29 MPa, followed by a Cr-depleted region into the austenite substrate. The compositions of the inner oxides at 8 MPa and 29 MPa are Cr-rich and largely similar to those of the single-layer oxides at 0.1 MPa exposure. These results suggest that corrosion testing in superheated steam may be a suitable surrogate for scoping tests of materials under SCW conditions at >650°C.
KeywordsAustenite Austenitic Stainless Steel Superheated Steam M23C6 Carbide Subcritical Water
The authors are grateful for financial support from the National Sciences and Engineering Research Council of Canada (NSERC)/Natural Resources of Canada (NRCan)/Atomic Energy of Canada Limited (AECL) Generation IV Technologies Program; and the facility support from Carleton University. Thanks are also given to J. Smith from Canadian Nuclear Laboratories (CNL) for helpful discussions.
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