Abstract
In order to meet the requirements of environmental protection, low nitrogen combustion is widely used in thermal power plants, which causes serious high temperature corrosion of water wall on fire side. At present, some power plants use water wall anti-corrosion coating to improve their service life. n this paper, a power plant water wall coating off to explore, analysis of water wall corrosion mechanism and coating failure reasons. The results show that: The direct reason for the large-scale peeling off water wall coating is that S element penetrates through the pores of the coating and corrodes the coating, resulting in the decrease of the adhesion between the coating and the substrate and the generation of a large number of microcracks. The microcracks continue to expand and extend under the action of thermal stress and S corrosion, which eventually leads to the large-scale peeling off the coating.
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