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在低共熔溶剂中添加乙二胺四乙酸(EDTA)和氯化铵2种添加剂电沉积制备Zn-Ni合金镀层。研究添加剂对合金电沉积行为、成分、形貌和腐蚀性能的影响。循环伏安测试表明,EDTA的加入可以促进Zn进入Zn-Ni镀层中,而氯化铵起抑制Zn还原的作用。随着EDTA含量的增加,镀层中的Zn含量增加,但镀层的晶粒尺寸和电流效率降低。氯化铵浓度的增大能够有效地降低镀层的晶粒尺寸和Zn的含量,提高阴极电流效率。腐蚀实验表明,从含有氯化铵的镀液中得到的Zn-Ni镀层比从含有EDTA的镀液中得到的镀层具有更高的耐腐蚀性能。此外,添加剂的加入提高了镀层的耐腐蚀性能。
Zn-Ni alloy coatings were prepared by electrodepositing two kinds of additives, ethylenediaminetetraacetic acid (EDTA) and ammonium chloride, into the eutectic solvent. The effects of additives on the electrodeposition, composition, morphology and corrosion resistance of the alloy were studied. Cyclic voltammetry test showed that the addition of EDTA can promote the Zn into the Zn-Ni coating, and ammonium chloride plays a role in inhibiting the reduction of Zn. With the increase of EDTA content, the content of Zn in the coating increased, but the grain size and current efficiency of the coating decreased. The increase of the concentration of ammonium chloride can effectively reduce the grain size of the coating and the Zn content, and improve the cathode current efficiency. Corrosion tests show that the Zn-Ni coating obtained from a bath containing ammonium chloride has a higher corrosion resistance than the coating obtained from a bath containing EDTA. In addition, additives added to improve the corrosion resistance of the coating.