Effect of stirring on electrodeposition and wear resistance of Co-Cr3C2 composite coating
[Introduction]Stirring rate is one of the critical factors during composite electrodeposition,and its control is essential for structure regulation and wear resistance enhancement of composite coating.[Method]The effect of stirring rate on electrodeposition of Co-Cr3C2 composite were studied by cathodic polarization curve measurement and electrochemical impedance spectroscopy(EIS).The microstructure,Cr3C2 content,and wear resistance of Co-Cr3C2 composite coatings prepared at different stirring rates were examined.[Result]The Cr3C2 particles in electrolyte were not transported efficiently at a low stirring rate(such as 270 r/min),resulting in few Cr3C2 particles adsorbed onto the cathode surface and weak cathodic polarization during electrodeposition.When the stirring rate was 320-380 r/min,the electrodeposition of Co-Cr3C2 composite showed strong cathodic polarization and low double-layer capacitance,facilitating the adsorption of particles onto cathode surface and the increase of Cr3C2 content in coating.However,too high stirring rate led to a decrease in the Cr3C2 content of coating.The Co-Cr3C2 composite coating electrodeposited at a stirring rate of 320 r/min featured the highest content of Cr3C2 particles and the best wear resistance.[Conclusion]Stirring significantly affects the electrochemical polarization and particle content in coating by promoting particle transport and flushing particles retained on the cathode surface during electrodeposition,and influencing the wear resistance of coating further.
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