Enhanced high-temperature corrosion resistance of (Al2O3–Y2O3)/Pt micro-laminated coatings on 316L stainless steel alloy

A 7-layer (Al2O3–Y2O3)/Pt micro-laminated coating was successfully prepared on 316L stainless steel alloy by magnetron sputtering. High-temperature cyclic oxidation and hot corrosion tests were adopted to investigate the high-temperature corrosion resistance of the coating. It is revealed that the (Al2O3–Y2O3)/Pt micro-laminated coating which effectively suppressed the inward diffusion of oxygen and corrosive fused salt to an extremely low level can significantly improve the high-temperature corrosion resistance of alloy substrate. The great mechanical properties of such coating were attributed to the brittle/ductile laminated composite structure by means of multilayer toughening and release mechanisms.

► A novel 7-layer (Al2O3–Y2O3)/Pt micro-laminated composite coating was prepared.
► The laminated coating exhibits excellent oxidation and spallation resistance.
► The micro-laminated coating provides excellent hot corrosion resistance at 900 °C.
► The brittle/ductile laminated structure enhances the coating’s fracture toughness.
► The high-temperature corrosion rate of 316L stainless steel is extremely low.