三元络合碱性电沉积锌镍合金的抗腐蚀性能研究  

Research on Corrosion Resistance of Ternary Complexation Alkaline Electrodeposition Zinc-nickel Alloy

作　　者：张秀[1] 王少龙 龙晋明[1] 裴和中[1] 由劲博[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]云南驰宏锌锗股份有限公司,曲靖655011

出　　处：《材料导报》2013年第14期120-122,125,共4页Materials Reports

摘　　要：采用四乙烯五胺(TEPA)、酒石酸钾钠和三乙醇胺(TEA)三元混合物作为镍离子络合剂配制碱性锌镍合金镀液,在低碳钢基材上电沉积制备锌镍合金镀层。利用电化学工作站测试了镀层在3.5%NaCl溶液中的极化曲线和电化学阻抗谱,考察不同电沉积条件参数(电流密度和镍离子相对含量)对锌镍合金镀层的腐蚀电化学行为的影响。结果表明:当镀液的镍含量在较宽范围内(n(Ni 2+)/n(Ni 2++Zn2+)=15%～30%)变化时,所得镀层对基体都有很好的防护作用;当电流密度为2～3A/dm2时得到的镀层抗腐蚀能力最强,而当电流密度过低和过高时都会使镀层的耐蚀性有所降低。The zinc-nickel alloy coating of electrodeposition preparation was made by the alkaline zinc-nickel al- loy plating bath which is composed of tetraethylenepentamine （TEPA）, potassium sodium tartrate and triethanolamine （TEA） ternary mixture as nickel ions complexing agent on low carbon steel substrate. The effect of different electro- deposition parameters （the current density and the relative content of nickel ions） on the corrosion electrochemical be- havior of zinc-nickel alloy coating in 3. 5 M NaC1 solutions was investigated by polarization curve and electrochemical impedance spectroscopy. The results indicate that the coating on the substrate has an optimal protective effect when nickel content of the hath within a broad range （n（Ni2＋ ）/n（Ni2＋ ＋Zn2＋ ） =15%-30%） changes. The coating corro- sion resistance is the strongest when the current density within 2-3 A/dm2. However, the current density is too low and too high will decrease the corrosion resistance of the coating.

关 键 词：碱性电镀锌镍合金 极化曲线 电化学阻抗谱 抗腐蚀性能 

分 类 号：TG178[金属学及工艺—金属表面处理]