[Introduction]The pulsed electrodeposition of Zn-Fe-Mn alloy coating was carried out on the surface of Q235 mild steel to improve its corrosion resistance.[Method]The effects of different factors on the corrosion resistance of Zn-Fe-Mn alloy coating were studied firstly by single-factor experiments.The electrodeposition process was then optimized by response surface method with the pH,current density,and temperature as key factors and the corrosion current density of Zn-Fe-Mn alloy coating measured in 3.5％NaCl solution as the response.A regression model representing the relationship between all the factors and corrosion current density was established.[Result]The optimal process parameters for electrodeposition of Zn-Fe-Mn alloy were determined as follows:pulse frequency 1 000 Hz,duty cycle 0.2,pH 6.0,current density 62.60 mA/cm2,temperature 29℃,and time 30 min.The actual corrosion current density of the Zn-Fe-Mn alloy coating electrodeposited under the optimized conditions was 2.26 μA/cm2,which differed from the model-predicted value by only 1.80％.[Conclusion]The regression model established in this study is reliable and can be used for optimizing the pulse electrodeposition process of Zn-Fe-Mn alloy,providing theoretical support for the development of high-performance coatings.
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