[Introduction]The effect of Cr3C2 particle dosage on the microstructure and wear resistance of Co-Cr3C2 composite coatings was studied to determine the optimal dosage of Cr3C2 particles to improve the wear resistance of Co-Cr3C2 composite coating.[Method]Co-Cr3C2 composite coatings were prepared on GH4169 alloy surface by electrodeposition in a cobalt-based plating bath with different dosages of Cr3C2 particles.The microstructure,particle content,microhardness,and tribological properties of Co-Cr3C2 composite coatings electrodeposited with different Cr3C2 dosages were examined by using scanning electron microscope(SEM),energy-dispersive spectrometer(EDS),microhardness tester,and material surface property comprehensive tester,respectively.[Result]With the increasing of Cr3C2 particle dosage in the plating bath,the distribution uniformity of Cr3C2 particles in Co-Cr3C2 composite coating was improved,and the particle content and microhardness of the composite coating was increased.However,the excessive addition of Cr3C2 particles brought negative effects to the Co-Cr3C2 composite coating.The Co-Cr3C2 composite coating electrodeposited with 70 g/L of Cr3C2 particle in the plating bath featured the highest volume fraction of Cr3C2(up to 33.49%),a cross-section microhardness of 626 HV0.1,and the best wear resistance.The Co-Cr3C2 composite coatings primarily underwent abrasive wear and minor adhesive wear during friction and wear test.[Conclusion]The dosage of Cr3C2 particles in the plating bath significantly affects the microstructure and wear resistance of Co-Cr3C2 composite coating.The suitable dosage of Cr3C2 particles is 70 g/L.
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