Research on Preparation,Oxidation Resistance and Corrosion Resistance of Cr/CrN Coating on SUS321 Stainless Steel Surface
Cr/CrN coatings were prepared on the surface of SUS321 stainless steel using magnetron sputtering technology.The microstructure and weight gain of samples after high-temperature oxidation and acidic salt spray corrosion experiments were characterized using scanning electron microscopy(SEM),X-ray diffraction(XRD)and analytical balance.The results show that the sample with a magnetron sputtering pressure ratio of PAr/PN2=3∶1 exhibits the best antioxidation and corrosion resistance.Based on this,multi-layer Cr/CrN coatings are prepared through cyclic deposition.The sample with 6-cycle coatings has a weight gain of 3.599 g/m2 after oxidation at 600℃for 200 h,with a dense surface oxide film and no peeling observed.In an acidic salt spray environment,the sample with a 6-cycle coating has no obvious oxidation for 480 h,and generates slight rust only at the edge after oxidation for 500 h.The 6-cycle Cr/CrN multilayer film coating prepared with a fixed magne tron sputtering pressure ratio of PAr/PN2=3∶1 exhibits the best antioxidation and resistance to acidic salt spray corrosion.
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