Abstract
? 2022 Elsevier B.V.The corrosion behavior and mechanism of Hastelloy C2000 and Inconel 740 in supercritical water with and without NaCl and oxygen were investigated in this work. The results show that the synergistic effect of chlorine and oxygen caused pits on oxides and promoted the formation of Fe2O3, and the chloride ions had passed through the outer oxide layer and penetrated the substrate inside. Iron oxides were detected in the outer oxide layer of Hastelloy C2000 and the transition layer of Inconel 740, and Cr2O3 formed in the inner layer of Hastelloy C2000, the inner and transition layers of Inconel 740. A detailed corrosion mechanism of alloys exposed to supercritical water containing oxygen and chloride based on the point defect model and attack effect of chloride ion were proposed.
NSTL
Elsevier