电沉积Ni-W合金在NaCl溶液中的腐蚀行为  

Corrosion Behavior of Ni-W Alloy in NaCl Solution

作　　者：姚颖悟[1] 姚素薇[1] 宋振兴[1] 

机构地区：[1]天津大学化工学院杉山表面技术研究室,天津300072

出　　处：《材料工程》2006年第9期42-44,56,共4页Journal of Materials Engineering

基　　金：国家教育部博士点基金项目(20030056034)

摘　　要：通过电沉积的方法制备了Ni-W晶态合金与Ni-W非晶态合金。采用极化曲线与电化学阻抗谱测试了Ni-W合金在0.5mol/L NaCl溶液中的腐蚀行为。结果表明,Ni-W非晶态合金在0.5mol/L NaCl溶液中的极化曲线与Ni-W晶态合金相比,腐蚀电位较正,且钝化区间明显。Ni-W非晶态合金在0.5mol/L NaCl溶液中的电化学阻抗谱容抗弧半径远远大于Ni-W晶态合金,并且随着浸泡时间的延长Ni-W非晶态合金的表面生成一层钝化膜,容抗弧半径变化较小,而Ni-W晶态合金的容抗弧半径随浸泡时间的延长而越来越小,表面腐蚀越来越严重。总体来说,Ni-W非晶态合金的耐蚀性能要远远优于Ni-W晶态合金。Ni-W crystal alloy and Ni-W amorphous alloy were prepared by electroplating. The corro sion behavior of Ni-W alloy in 0.5mol/L NaCl solution was tested by the polarization curves and electrochemical impedance spectroscopy （EIS）. The results show that the corrosion potential of Ni- W amorphous alloy in 0.5mol/L NaCl solution is more positive and the passive region is more obvious compared with Ni-W crystal alloy. The capactive loop of EIS of Ni-W amorphous alloy in 0.5mol/L NaCl solution is significantly larger than that of Ni-W crystal alloy and with the increasing of the immersion time a flat of passive membrane generated on the surface of Ni-W amorphous alloy and thus the variety of the capactive loop is not obvious. While the capactive loop of Ni-W crystal alloy becomes smaller as the increasing of the immersion time and the corruption of the surface becomes more serious. In conclusion, the anticorrosion ability of Ni-W amorphous alloy is much more excellent than that of Ni-W crystal alloy.

关 键 词：NI-W合金 腐蚀行为 电化学阻抗谱 

分 类 号：TG172.9[金属学及工艺—金属表面处理]