中文摘要：

利用脉冲电镀法在Q235钢表面制备Ni-Cr-Mn合金镀层。采用辉光放电光谱仪（GDS）、扫描电镜（SEM）、Tafel曲线和电化学阻抗谱（EIS）,考察占空比对镀层成分、沉积速率、表面形貌和耐蚀性的影响。结果表明：随占空比增大,镀层中镍含量增加,铬、锰含量减少;沉积速率减小;在35g/L NaCl溶液中,镀层耐蚀性减弱;占空比为20%时,镀层均匀致密,具有最大的腐蚀电位（-0.301V）、最小的腐蚀电流密度（1.819×10^-8 A·cm^-2）和最大的电荷转移电阻（3 763Ω·cm^2）,耐蚀性最好。

英文摘要：

Ni-Cr-Mn alloy coating is obtained on Q235 steel surface by pulse electroplating.The effect of duty cycle on elements content in coating,coating deposition rate,surface morphology and corrosion resistance were investigated by glow discharge spectroscopy（GDS）,scanning electron microscopy（SEM）,Tafel curve and electrochemical impedance spectroscopy（EIS）.The results show that with increasing duty cycle,Ni content increases,Cr and Mn content decreases.Coating deposition rate decreases.In 35g/L NaCl solution,corrosion resistance weakens.Coating prepared at duty cycle of 20%is uniform and compact and has the biggest corrosion potential（-0.301 V）,the smallest corrosion current density（1.819×10^-8 A·cm^-2）and the biggest charge transfer resistance（3 763Ω·cm^2）and exhibits the best corrosion resistance.