Abstract

Over the last 10 years, extensive research has been performed to evaluate the corrosion behavior of both metallic and refractory materials in multicomponent-gas and liquid-slag environments that are relevant to various coal gasification schemes. This paper examines the available information on metallic materials to give insight into the development of protective scales on alloy surfaces and causes of scale breakdown. Available long-term kinetic data on sound-metal loss are examined to evaluate the effects of alloy and gas chemistry on corrosion of materials in complex oxygen-sulfur atmospheres. In addition, the corrosion behavior of a variety of refractory materials after laboratory and pilot plant exposures is examined and wear mechanisms are discussed. From current knowledge of the process environments and of the behavior of metallic and refractory materials, a number of areas are identified for long-range research that can have significant impact on the design and performance of coal gasification plants.

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