This paper reports on corrosion investigations on binary Ni-Cr and ternary Ni-Cr-Al and Ni-Cr-W alloys, which were exposed to the product stream of dichloromethane oxidation by hydrogen peroxide in excess, i.e., an oxygen containing solution of hydrogen chloride in water, at 400 bar and various temperatures between 115 and 410°C, for 48 h. These investigations were targeted at the quantitave influence of alloying elements on corrosion damage, which is the metal loss after mechanical and chemical removal of adherent corrosion products, and the elucidation of corrosion mechanisms by careful post-test examinations of corroded specimens (SEM, EDX, XRD, cross-sections). The results
should serve as a basis for materials selection and development for SCWO (Supercritical Water Oxidation) applications, especially for those in which acidic solutions are formed.
Keywords: supercritical water, oxidation, SCWO, dichloromethane, hydrogen chloride, corrosion, high temperature, high pressure, nickel, chromium, aluminum, tungsten, alloy, alloy 671.