摘要
为了提高热浸镀锌层的耐蚀性,在锌浴中添加少量的Ni和V,获得了Zn-0.05%Ni、Zn-0.05%Ni-0.05%V镀层。利用电化学阻抗、极化及中性盐雾腐蚀测试,研究了Ni和V对镀层耐蚀性的影响。结果表明:与纯Zn镀层相比,Zn-0.05%Ni、Zn-0.05%Ni-0.05%V镀层在5%NaCl溶液中的电化学阻抗增大,自腐蚀电位正移,极化电阻增大,腐蚀电流密度减小,耐蚀性提高,其中,Zn-0.05%Ni-0.05%V镀层耐蚀性最佳;Ni、V的加入在一定程度上抑制了阳极反应和阴极反应,延缓了白锈的产生,镀层耐蚀性能提高。
The hot-dipped Zn-0.05% Ni and Zn-0.05% Ni-0.05% V coatings were gained by adding a small amount of Ni and V in the zinc bath in order to improve the corrosion resistance of coating. The effects of Ni and V on corrosion resistance were studied by electrochemical impedance spectroscopy, electrochemical polarization and neutral salt spray （NSS） tests. The results show that, compared with pure Zn coating, Zn-0.05%Ni and the Zn-0.05%Ni-0.05% V coatings in 5% NaCl solution are of larger electrochemical impedance, lower corrosion current, larger polarization resistance, less spontaneous corrosion tendency and better corrosion resistance. Zn-0.05% Ni-0.05% V coating shows the best corrosion resistance. To some extent, adding a small amount of Ni and V in the zinc bath suppresses the anodic and cathodic processes of the corrosion of coatings, delays the formation of white rust, enhances the corrosion resistance of coatings.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2009年第5期12-14,共3页
Surface Technology
关键词
热浸镀
镀锌
NI
V
耐蚀性能
Hot,dipped galvanizing
Ni and V
Corrosion resistance
