The erosion-corrosion behavior of protective coatings☆

Abstract The metal wastage caused by the impact of small solid particles on surfaces that are simultaneously corroded at elevated temperatures is a problem in several types of energy system. These systems cover a spectrum from heat exchanger tubes in fluidized bed combustors to steam turbine nozzles and blades. The use of protective coating systems of various kinds to extend the life of the components has been demonstrated to increase part life several times over. The behavior of various compositions and morphologies of coatings applied using several different processes in erosion and erosion-corrosion service environments is presented. The factors which determine their protective capabilities and the mechanisms by which they resist their operating environments are discussed. What is required of a coating system to be protective is defined.