Corrosion behavior of alumina-forming and oxide dispersion strengthened austenitic 316 stainless steel in supercritical water

The corrosion behavior of alumina-forming austenitic (AFA) 316 stainless steel (SS) and oxide dispersion strengthened (ODS) 316 SS in aerated supercritical water (SCW) at 650 °C/25 MPa was investigated. The results show that the weight gain curves of AFA and ODS 316 SS follow near-parabolic law. Both AFA and ODS 316 SS show higher corrosion resistance in SCW than normal 316 SS, which is because that Al-Cr rich oxide and Cr-rich oxide layer are formed on AFA and ODS 316 SS, respectively. The corrosion process and mechanism of AFA and ODS 316 SS are discussed.