Abstract

Chlorine corrosion is one of the major problems in superheater tanks at power plants that use fuels containing chlorine. Reducing conditions and combustion residues also increase the rate of corrosion. High chromium HVOF nickel-based coatings are seen as a way to prevent chlorine corrosion at elevated temperatures. Intermetallic layers are also of interest in this regard. In this paper, corrosion resistance of several HVOF coatings, laser treated HVOF coatings, diffusion coatings, and boiler steels in chlorine containing atmospheres is studied. Special attention is paid to the effect of the coating composition and coating structure on corrosion. Corrosion tests are performed in two simulated biofuel combustion atmospheres. One atmosphere is oxidizing and the other atmosphere is reducing. Paper includes a German-language abstract.

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