Microstructure and Corrosion Resistance of Laser Cladded Coating of Medium-Entropy Alloy CoCrNi on Surface of Stainless Steel for Automobile
In order to improve surface hardness and corrosion resistance of 304 stainless steel,a medium-entropy alloy(CoCrNi)coating was prepared on the surface of 304 stainless steel by laser cladding,and phase composition,element distribution and corrosion resistance of the cladded coating were studied.The results show that the treatment has achieved good metallurgical bonding between the cladded CoCrNi coating and the substrate,with no cracks,pores and other defects.The cladded coating is composed of single FCC phase,and exhibits dendrite and inter-dendrite structure.The elements are uniformly distributed on the cladded coating without obvious segregation.The uniform distribution of Cr element plays a positive role in improving corrosion resistance of the coating.The CoCrNi coating has its polarization resistance(101.65 kΩ)higher than that of 304 substrate(90.56 kΩ),and also significantly higher corrosion resistance.
high-entropy alloycladded coatingsurface treatmentlaser claddingCoCrNimedium-entropy alloycorrosion resistance304 stainless steelautomobile material
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