摘要
采用氧化锌、六水硫酸镍为主盐,二乙烯三胺、羟丙基乙二胺、三乙醇胺组合形成的络合剂C、氢氧化钠配制成碱性锌镍合金体系电镀液,进行电沉积获得锌镍合金镀层,探究单一因素对电沉积锌镍合金镀层性能的影响。采用X射线荧光分析仪表征了镀层厚度及镍含量,采用扫描电子显微镜、X射线衍射表征了锌镍合金镀层的微观形貌和晶体结构,研究了电镀温度及电流密度对锌镍合金镀层镍含量、微观形貌、晶体结构以及耐蚀性能的影响。研究结果表明:在络合剂C的碱性锌镍合金镀液中,电镀温度和电流密度的变化对镀层镍含量的影响较小,电镀温度和电流密度分别在15℃~30℃、1~5 A/dm^(2)变化时,镀层的镍含量能够稳定保持在13%~15%,镀层均为单一的γ相结构。当电镀温度和电流密度分别为20℃和1 A/dm^(2)时,镀层表面较平整、致密,锌镍合金镀层的耐蚀性最好。电镀温度和电流密度主要会影响电沉积过程中的阴极极化,从而影响电沉积锌镍的结晶过程,使得不同条件下锌镍合金镀层的镀层镍含量、微观形貌及晶体结构产生差异,进而影响锌镍合金镀层的耐蚀性能。
The alkaline Zn-Ni alloy system electroplating solution was prepared by using zinc oxide and nickel sulfate hexahydrate as the main salts,and the complexing agent C and sodium hydroxide formed by the combination of diethylenetriamine,hydroxypropyl ethylenediamine and triethanolamine were used to obtain the Zn-Ni alloy coating by electrodeposition,and the influence of a single factor on the performance of the electrodeposited Zn-Ni alloy coating was explored.X-ray fluorescence analyzer was used to characterize the coating thickness and nickel content,scanning electron microscopy and X-ray diffraction were used to characterize the microscopic morphology and crystal structure of Zn-Ni alloy coating,and the effects of electroplating temperature and current density on the nickel content,microstructure,crystal structure and corrosion resistance of Zn-Ni alloy coating were studied.The results show that the nickel content of the plating layer can be stably maintained at 13%-15%when the temperature change range from 15℃to 30℃and current density change range from 1 A·dm^(-2)to 5 A·dm^(-2),respectively,and the plating layer is a singleγphase structure.When the plating temperature and current density are respectively 20℃and 1 A/dm^(2),the surface of the coating is flat and dense,and the corrosion resistance of the Zn-Ni alloy coating is the best.The electroplating temperature and current density mainly affect the cathodic polarization in the electrodeposition process,thereby affecting the crystallization process of the electrodeposited Zn-Ni,which makes the nickel content,microscopic morphology and crystal structure of the Zn-Ni alloy coating different under different conditions,and then affects the corrosion resistance of the Zn-Ni alloy coating.
作者
李雨昕
丁运虎
秦锐
胡遐林
黄朝志
王一品
何光耀
Li Yuxin;Ding Yunhu;Qin Rui;Hu Xialin;Huang Chaozhi;Wang Yipin;He Guangyao(China Academy of Machinery Wuhan Research Institute of Materials Protection Co.,Ltd.,Wuhan 430030,China;School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Shanghai Aircraft Manufacturing Company Co.,Ltd.,Shanghai 200436,China)
出处
《电镀与精饰》
北大核心
2025年第7期1-8,共8页
Plating & Finishing
关键词
锌镍合金
碱性电镀
镀层镍含量
耐蚀性
微观形貌
Zn-Ni alloy
alkaline electroplating
nickel content of coating
corrosion resistance
microstructure
