CrMnFeCoNi coating was produced on the X65 steel substrate by the arc cladding method. The microstructure and chemical composition of the coating were explored. The results reveal that the CrMnFeCoNi coating exhibited a single-phase structure. The corrosion behaviour of the coating was investigated by the electrochemical test in NaCl solution (3.5 wt-%). The results show that the CrMnFeCoNi coating possessed lower corrosion current density and higher charge transfer resistance than the X65 steel. The superior corrosion resistance of the CrMnFeCoNi coating compared to the X65 steel substrate was due to the formation of the protective passive film. The coating effectively improved the corrosion resistance of the X65 steel substrate.
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