The use of metallic materials in chlorinating environments at high by the formation of volatile metal chlorides. The limiting conditions may be estimated from a knowledcje of the phvsical properties of the temperatures is limited primarily for the use of specific materials potential corrosion rxoducts and the thermodynamic stabilities of those-phases relative to the exposure conditions. To illustrate this approach, data from tests of nickel-base alloys in Ar-HCl mixtures at 685-785°C are used. Corrosion kinetics were measured and corrosion products, including condensate, were identified, Combining the data from these tests with thermodynamic analyses of the alloy-environment systems provides an improved understanding of materials behavior in reducing chlorinating environments and allows materials limitations to be defined.
Keywords: High temperature chlorination; hydrogen chloride; nickel-base alloys; corrosion rates; volatile metal chlorides