CORROSION OF 316 STAINLESS STEEL IN SUPERCRITICAL WATER

摘要

Effects of temperature, pressure and time on the corrosion behavior of 316 stainless steel in supercritical water were examined. 316 stainless steel, exposed in distilled water, showed mass loss at temperature of 300 - 400 ℃ and mass gain at temperature of 450 - 550 ℃. Mass loss showed to be maximum at 350 ℃ on the 316 stainless steel exposed in distilled water. There is no relationship between mass change and pressure on 316 stainless steel at pressure of 40-100 MPa. Oxidation reaction of 316 stainless steel occurred according to a parabolic law at 500 ℃. A homogeneous oxide layer was formed on 316 stainless steel exposed in distilled water. Oxides such as γ-Fe_2O_3, Fe_3O_4 and FeCr_2O_4 were identified on the surface of 316 stainless steel exposed at 400-550 ℃ in distilled water. The thickness of the oxide layer increases with increasing temperature.