Abstract
To better understand the hot corrosion behavior of LCZ ceramic coatings against Na2SO4 molten salts, three series of hot corrosion tests were performed from the perspectives of Na2SO4 content, corrosion duration and corrosion temperature. Different corrosion products of La2O2SO4, La2O2S and Ce7O12 were identified depending on the hot corrosion conditions and the probable reaction mechanisms were proposed. The effects of Na2SO4 content, corrosion duration and corrosion temperature on hot corrosion behavior were investigated systematically. Results show that Na2SO4 molten salt is hard to react chemically with LCZ coating. The chemical reaction between LCZ coating and Na2SO4 molten salt needs a long time. When the content of Na2SO4 salts is high, the corrosion reaction could be accelerated. The phase transition and decomposition of corrosion products are responsible for the different hot corrosion behaviors at 1050–1500 °C. Moreover, a model describing the hot corrosion process induced by Na2SO4 molten salt is built, which includes two stages of eroding LCZ coating.
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