Abstract
A novel glass-ceramic coating was applied onto the 1Cr11Ni2W2MoV stainless steel. The oxidation and corrosion behaviors of coated and uncoated steels were comparatively investigated in air and in the presence of NaCl + Na2SO4 eutectic deposits at 650 °C, respectively. Protective scales formed on the surface of stainless steel prevented the severe oxidation of the alloy. Catastrophic hot corrosion occurred on the steel when a salt film was attached, producing loose iron oxide layers and internal corrosion zone. The glass-ceramic coating acted as a barrier that effectively hindered the invasion of corrosive species during the oxidation and hot corrosion tests.
Highlights
Martensitic stainless steel (MSS for short) is widely used in turbine blades, discs, and other high-temperature parts due to its high temperature oxidation resistance and mechanical properties at high temperatures [1]
Sulfur in fuel and chlorine in marine environments trend to deposit on the surface of the component and form a salt film, which will cause serious hot corrosion invasion on the surface of the MSS [5,6,7,8,9]
The Cr2O3 film on the MSS grows slowly and provides a satisfactory high temperature oxidation resistance at 650 ◦C, which can be proved by the results in Figures 3 and 5
Summary
Martensitic stainless steel (MSS for short) is widely used in turbine blades, discs, and other high-temperature parts due to its high temperature oxidation resistance and mechanical properties at high temperatures [1]. One of the most effective ways to improve the hot corrosion resistance of alloys is to apply a high temperature protective coating on the alloy surface. The metal coating (such as NiCrAlY) can combine with the substrate, but its hot corrosion resistance is still not satisfactory [10,11]. Ceramic coatings have high chemical stability, but they are easy to peel off in cold and hot cycles because of the large gap of the thermal expansion coefficient (CTE for short) between the coating and the substrate [12,13,14]
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