一种碱性电镀锌镍合金镀层的抗腐蚀性能研究  

Study on Corrosion Resistance of Alkaline Zinc-nickel Alloy Plating

作　　者：张秀[1] 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,云南昆明650093

出　　处：《热加工工艺》2013年第2期127-129,139,共4页Hot Working Technology

摘　　要：在一种锌镍合金碱性电镀体系中,以四乙烯五胺(TEPA)和三乙烯四胺(TETA)混合物作为镍离子络合剂的碱性电镀锌镍合金体系,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、镍含量、搅拌等)对锌镍合金镀层的腐蚀电化学行为的影响。结果表明,在3.5%NaCl溶液中的模拟海水溶液中,通过极化曲线测得腐蚀电位和腐蚀电流可知镀液含镍含量一定范围内(Ni2+/Ni2++Zn2+=15 mol%～20 mol%,得到的镀层对基体有很好的防护作用;随着电流密度的增大镀层的腐蚀电位变负;腐蚀介质的酸碱性越强对镀层的腐蚀越大。In alkaline zinc-nickel alloy plating system, the mixture of tetraethylenepentamine （TEPA） and triethylenetetramine （TETA） was used for Ni ion complexing agent in alkaline electroplate zinc-nickel alloy system and electrochemical deposition in the low carbon steel substrate. The deposits can be acquired by different conditions （content of triethanolamine, current density, stir） and studied by electrochemical measurements in 3.5% sodium chloride solution as polarization curves and electrochemical impedance spectroscopy （EIS）. Corrosion potential and corrosion current polarization curve show that the coating on the subsWate has a good protective effect by obtained in nickel content of plating bath within a certain range （Ni2/Ni2＋Zn2=15 mol%-20mol%）. As the current density increasing, the corrosion potential of the coating becomes negative. The stronger of acid and alkaline of corrosive medium the greater corrosion of the coatings.

关 键 词：碱性电镀锌镍合金 极化曲线 抗腐蚀性能 

分 类 号：TG174[金属学及工艺—金属表面处理]