Abstract: Fe₄₈Cr₁₅Mo₁₄C₁₅B₆Y₂ amorphous alloy coating was prepared on Q235 steel substrate by plasma spraying technique, and the coating was heat treated at 200, 300, 500, 600, 700℃. The effect of heat treatment on the microstructure, electrochemical corrosion resistance and uniform corrosion resistance of the coating was studied. The results show that with the increase of heat treatment temperature, the amorphous phase content in the coating decreased, and the porosity decreased first and then increased; the porosity of the coating heat-treated at 300℃ was the lowest, and lower than that of the unheat-heated coating. The crystal phases in the coating after heat treatment mainly included α-Fe, Fe-Cr, Fe₆₃Mo₃₇, Fe₃C. With the increase of heat treatment temperature, the free corrosion current density of the coating decreased first and then increased; the free corrosion current density of the coating heat-treated at 300℃ was the smallest, and the electrochemical corrosion resistance was the best. After heat treatment, the mass loss per unit area of the coating immersed in NaCl solution for 31 d decreased; the higher the heat treatment temperature, the smaller the mass loss per unit area, indicating the uniform corrosion resistance of the coating was improved.