The hot salt corrosion test at 700 ℃ on five MCrAlY materials was conducted.Through the analysis of the material surface,corrosion products,corrosion cross-section,corrosion weight loss and other properties,the effects of basic elements of MCrAlY such as Co,Cr,and Al on hot salt corrosion of sulfur-containing materials at 700 ℃ were studied.The results show that at 700 ℃,the corrosion products are mainly chromium oxide and aluminum oxide,accompanied by a small amount of spinel.Corrosion spreads to depth in the form of a reticular aluminum oxide,and the vicinity of the reticular aluminum oxide is often accompanied by the formation of chromium sulfide.Co and Cr are beneficial elements for resisting hot corrosion.Among them,Cr has higher hot corrosion resistance at 700 ℃ than that of Co.
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