Material Performance in Chlorinated Supercritical Water Systems Available to Purchase

This paper gives an overview of investigations on the corrosion behavior of commercially available materials and nickel-chromium model alloys in chloride-containing, high-pressure aqueous solutions (mostly oxygenated, diluted hydrochloric acid [HCl] at 40 MPa), which were performed at the Institut fuer Materialforschung III in the Forschungszentrum Karlsruhe, Germany. The experimental techniques applied are introduced and the results obtained for the commercial alloys are presented and related to work published by other authors. Especially the influence of the process parameters temperature, pressure, and pH on the performance of Alloy G-30 (UNS N06030) is discussed. An internal oxidation type of material is proposed for substantial material consumption in the course of corrosion processes that start locally but eventually spread to be general (locally starting).