Abstract:This paper conducted a hot salt corrosion test at 700°C on five MCrAlY materials. Through the analysis of the material surface, corrosion products, corrosion cross-section, corrosion weight loss and other properties, the effect of basic elements of MCrAlY such as Co, Cr, and Al on sulfur-containing materials at 700°C was studied. The results show that at 700°C, 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, resistance of Cr to hot corrosion at 700°C is higher than that of Co.