【摘要】 在稳定的酸性柠檬酸盐溶液中，在低碳钢基体上电镀获得了Ni-Fe-Co合金镀层，并研究了电镀条件和钴含量对镀层性能的影响，得到了最佳镀层工艺参数。利用扫描电子显微镜、能谱仪、电化学阻抗谱、极化曲线和数字显微硬度计对合金镀层进行了研究。结果显示，合适的工艺参数是10 A/dm²、45℃和10 g/L柠檬酸三铵。Ni-Fe-Co合金镀层的钴含量随着钴离子浓度的增加而线性增加，镀层均为简单的面心立方固溶体结构。随着镀层中钴含量的增加，镀层的耐腐蚀性能和硬度先升高后降低。Ni-Fe-13.51Co（质量分数）镀层具有显著的防腐蚀性能，其电荷转移电阻为3031Ω·cm²，腐蚀电流密度为5.754×10^-6 A/cm²。更多还原

【Abstract】 Ni-Fe-Co alloy coatings were obtained on mild steel substrates by electrodeposition from stable acidic citrate solution. The effects of plating conditions and cobalt content on the coating performance were investigated, and the optimal electrodeposition process parameters were obtained. The alloy coatings were investigated by scanning electron microscope, energy dispersive spectrometer,electrochemical impedance spectrum, polarization curve, and digital microhardness meter. Results show that the suitable processing parameters are 10 A/dm², 45℃, and triammonium citrate of 10 g/L. The cobalt content of Ni-Fe-Co alloy coatings is increased linearly with increasing the cobalt ion content. The coatings have simple face-centered cubic solid solution structure. With increasing the cobalt content in the coating, the corrosion resistance and microhardness of coatings are increased firstly and then decreased. The Ni-Fe-13.51Co（wt%） coating exhibits the remarkable corrosion resistance: the charge transfer resistance is 3031 Ω·cm², and the corrosion current density is 5.754×10^-6 A/cm².更多还原