γ相锌镍合金膜与锌膜的耐腐蚀性能比较  

Comparison of the Anti-corrosion Performance Between Electrodepositingγ-shape Zn-Ni Alloy Film and Zn Film

作　　者：郑凯[1] 韩玉娟[2] 秦天羽 张方[1] 韩玉华[1] 

机构地区：[1]南京工程学院环境工程学院,南京211167 [2]淮安市高级职业技术学校机电工程系,江苏淮安223005

出　　处：《中国表面工程》2014年第1期70-74,共5页China Surface Engineering

基　　金：江苏省省环保厅科研课题项目(2013023);江苏省高等学校大学生实践创新训练计划(201311276046)

摘　　要：在碱性介质中，通过电化学沉积方法在低碳钢表面制备锌镍合金，采用X射线衍射仪测试合金的显微结构，通过分析镀锌膜和制备得到的γ相锌镍合金的塔菲尔曲线和交流阻抗谱，获得它们在5%氯化钠溶液中浸润24~144 h的腐蚀电位和腐蚀电流密度，以及低频率区的实部数值，从而评价其耐腐蚀性能。结果表明：制备得到的合金晶形为γ相，合金主要衍射角度为43°。γ相锌镍合金膜的腐蚀电位比锌膜的腐蚀电位高176~220 mV，腐蚀推动力比锌膜小，锌膜的腐蚀电流密度大约是γ相锌镍合金膜的3~5倍；在1~5 Hz低频率区，γ相NiZn合金薄膜的交流阻抗谱的实部值为镀锌膜的16.5倍。因此γ相锌镍合金膜比镀锌膜具有更强的耐腐蚀性。The ZnNi alloy was prepared on the surface of low carbon steel in an alkaline solution through the electrochemical deposition method. The microstructure was testified by analyzing the Xray diffraction graph. The anticorrosion performances of prepared γshape ZnNi alloy and Zn films were assessed by comparing important parameters. They include corrosion potential, corrosion current density and values of real part in the low frequency range. These electrochemical parameters were obtained from analyzing the data derived from Tafel curve and alternating current （AC） impedance spectroscopy while γshape ZnNi alloy and Zn films were dipped in 5% sodium chloride solution from 24 to 144 hours. The results show that the main diffraction angle 2θ of prepared ZnNi alloy is equal to 43°. This further proved that the crystalline form of prepared ZnNi was γcrystalline form. The potential of γcrystalline form Zn Ni alloy is 176220 mV higher than that of Zn film, which indicate the driving force on corrosion on the surface of γcrystalline form Zn Ni alloy is much less than that of Zn film. The corrosion current density of Zn film is about 3 to 5 times that of γcrystalline form Zn Ni alloy. In the low frequency range of 1 to 5 Hz. The values of real part of γcrystalline form ZnNi alloy is 16.5 times that of Zn film. Thus γshape ZnNi alloy exhibits stronger anticorrosion performance than Zn film does.

关 键 词：γ-相镍锌合金 塔菲尔曲线 腐蚀电流密度 腐蚀电位 

分 类 号：TG174.36[金属学及工艺—金属表面处理]