Co-W/CeO2 composite coatings were prepared on the surface of ordinary structural steel by electrodeposition,and the effect of concentration of CeO2 particles in the bath on the microstructure,chemical composition,binding force,hardness,wear resistance and high temperature oxidation resis-tance of the composite coating was investigated.The results show that Co-W/CeO2 composite coating is firmly bound to the substrate,there are cell like grain aggregates distributed on the surface,with chemi-cal compositions of Co,W,Ce,and O.As the concentration of CeO2 particles in the bath increased from 2 g/L to 15 g/L,the difference of grain aggregate size of the composite coating first decreased and then increased,and the amount of CeO2 particles adsorbed on the surface and boundary of the grain aggregate first increased and then decreased.As a result,the hardness,wear resistance and high temper-ature oxidation resistance of the composite coating increased first and then decreased.When the concen-tration of CeO2 particles in the bath is 8 g/L,the Co-W/CeO2 composite coating has good densification,the grain aggregate size is more uniform,and its surface roughness is only 0.39 μm.The hardness of the composite coating is about 76 HV higher than that of Co-W alloy coating,and the composite coating also shows good wear resistance and high temperature oxidation resistance.The friction coefficient and oxidation weight gain are only 0.43 and 0.74 mg/cm2.
Co-W/CeO2 composite coatingelectrodepositionCeO2 particlesbinding forcehigh temperature oxidation resistance
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