An effective utilization of available coal reserves in the U.S. requires conversion to a form of energy that is reasonably clean and a suitable substitute for present energy sources. Selection of materials for application in coal-conversion systems is strongly influenced by the hostile corrosive environments and elevated temperatures that characterize these processes. In the present paper, the role(s) of deposits in the corrosion behavior of materials in various applications are examined and areas for additional research are identified.

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