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The use of coatings has as its goal protecting heated surfaces and gas ducts against low temperature corrosion caused by the high content of sulfur in a number of energy fuels. The high relative (with respect to 1000 kcal/kg heat producing capacity) sulfur content is found in fuel oils (0.25 to 0.35 percent per thousand kcal/kg) and certain solid fuels (up to 1 percent per thousand kcal/kg). During the combustion of these fuels, the dew-point of smokestack gases is 135 to 150 exp 0 C, which leads to noticeable corrosion of the metal up to temperatures of 140 exp 0 C. In order to protect the heated sheets of the cold lining against corrosion, a coating of acid resistant enamel is used. Research for optimum coatings for gas ducts continues. At this stage, it is suggested to keep the temperature of exhaust gases higher than the temperature of the dew-point of smokestack gases and to make the gas ducts of low alloy steels, whose resistance to corrosion is higher than that of carbon steel. (ERA citation 01:020001)