目的 揭示柠檬酸铵浓度对脉冲电镀 Ni-Cr-Mo 合金镀层元素含量、沉积速率、表面形貌和耐蚀性的影响规律。方法 采用脉冲电镀法在 Q235 钢表面制备 Ni-Cr-Mo 合金镀层，利用辉光放电光谱仪、扫描电镜、 Tafel 曲线和电化学阻抗谱考察柠檬酸铵浓度对镀层元素含量、沉积速率、表面形貌和耐蚀性的影响。 结果 随柠檬酸铵浓度的增大，镀层镍含量减小，铬、钼含量增大，镀层沉积速率减小，镀层表面颗粒的尺寸减小，镀层在 3.5%NaCl 溶液中的耐蚀性先增强后减弱。 结论 柠檬酸铵质量浓度为196 g/L 时，镀层具有最大的自腐蚀电位（?0.537 V）、最小的腐蚀电流密度（0.313 μA/cm2）和最大的电荷转移电阻（2075 ?·cm2），耐蚀性最好。

The work aims to reveal the influencing law of ammonium citrate concentration on element content, deposition rate, surface morphology and corrosion resistance of Ni-Cr-Mo alloy coating prepared by pulse electroplating. Ni-Cr-Mo alloy coatings were prepared on the surface of Q235 steel by pulse electroplating. The effects of ammonium citrate concentration on coating element content, deposition rate, surface morphology and corrosion resistance were inspected by glow discharge spectroscopy (GDS), X-ray diffraction (XRD), scanning electron microscopy (SEM), Tafel curve and electrochemical impedance spectroscopy (EIS). As ammonium citrate concentration increased, Cr content and Mo content increased; Ni content, deposition rate and the size of particles on coating surface decreased; corrosion resistance of coatings in 3.5% NaCl solution first increased and then decreased. Coating prepared in 196 g/L ammonium citrate bath had the highest corrosion potential(?0.537 V), the lowest corrosion current density (0.313 μA/cm2) and the highest charge transfer resistance (2075 ?·cm2), exhibiting the best corrosion resistance.