Supercritical water oxidation (SCWO) is a promising and very effective method for the oxidation of organic wastes. Its high solubility for organic compounds and its special physical properties (i.e. density, viscosity) resulting in a key advantage over standard processes like incineration. Due to the formation of HCl during oxidation of chlorine organics, a severe corrosion attack of most of the materials has been observed. This paper describes the results of investigations of nickel base alloy G-30, exposed at pH values from 2 to 6, temperatures ranging from 100-420°C and pressures between 250 and 480 bar at duration's of 120 hours in a CH2Cl2/H2O2- respectively NaCl/H2O2-mixture with about 2000 wppm of
chloride. The weight losses varied between a few and ...
Keywords: SCWO, supercritical water, corrosion, oxidation, chloride, high temperature, high pressure, pH, nickel base alloy