摘要
The potentiostatic electrodeposition of Zn-Ni-Mn was carried out in an alkaline solution with the addition of Mn salt.The effects of electrolyte Mn2+concentration and deposition potential on the surface morphology,phase structure and corrosion behavior of coatings were studied.The results of corrosion polarization showed that the presence of higher Mn content in Zn-Ni-Mn coatings could lead to the formation of a good passive layer with a 7-fold increase in Rp of coating and a significant decrease in the corrosion current density compared to those of Zn-Ni coating.The XRD and the XPS analyses from the surface of Zn-Ni-Mn after corrosion test showed that the passive layer was composed of zinc hydroxide chloride,zinc oxide,zinc hydroxide carbonate,and manganese oxides.
在添加Mn盐的碱性溶液中进行Zn-Ni-Mn镀层的恒电位电沉积,研究电解液Mn^2+浓度和沉积电位对涂层表面形貌、相结构和腐蚀行为的影响。腐蚀极化实验结果表明,Zn-Ni-Mn镀层中较高的Mn含量可能导致形成良好的钝化层;与Zn-Ni涂层相比,其Rp(极化电阻)增大7倍,而腐蚀电流密度显著降低。腐蚀试验后Zn-Ni-Mn镀层表面的XRD和XPS分析表明,钝化层由碱式氯化锌、氧化锌、碱式碳酸锌和氧化锰组成。
