| 热镀锌层镧盐转化膜的结构及其耐蚀性能 |
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| 引用本文： | 卢锦堂,钟正,孔纲. 热镀锌层镧盐转化膜的结构及其耐蚀性能[J]. 材料保护, 2009, 42(4) |
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| 作者姓名： | 卢锦堂 钟正 孔纲 |
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| 作者单位： | 华南理工大学材料科学与工程学院,广东,广州510640;华南理工大学材料科学与工程学院,广东,广州510640;华南理工大学材料科学与工程学院,广东,广州510640 |
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| 摘 要： | 热镀锌件铬酸盐转化膜耐蚀性优良,但环境污染严重;铈盐转化膜效果差,复合铈盐转化膜耐蚀好,成本高;镧盐转化膜无毒,耐蚀效果比铈盐好.采用以La(NO3)3为主盐的成膜溶液浸泡热镀锌层,获得了La盐转化膜.通过SEM,EDS和电化学测试方法对La盐转化膜层的结构和耐蚀性能进行了研究.结果表明:转化膜随浸泡时间增加而增厚,膜的极化电阻和电化学阻抗也随之增大;膜层中存在均匀分布的微裂纹,且随膜增厚而扩宽;处理时间过长,膜的表层开裂脱落,极化电阻和电化学阻抗下降.浸泡30 min所获La盐转化膜,极化电阻和EIS低频阻抗达20 kΩ·cm2以上,耐蚀性能远高于单一铈盐转化膜,极大地提高了热镀锌件的耐蚀性能.
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| 关 键 词： | 镧盐转化膜 稀土 热镀锌 结构 耐蚀性能 |
Microstructure and Corrosion Resistance of Lanthanum Salt Conversion Coating on Hot-Dip Galvanized Steel |
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| LU Jin-tang,ZHONG Zheng,KONG Gang. Microstructure and Corrosion Resistance of Lanthanum Salt Conversion Coating on Hot-Dip Galvanized Steel[J]. Journal of Materials Protection, 2009, 42(4) |
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| Authors: | LU Jin-tang ZHONG Zheng KONG Gang |
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| Affiliation: | LU Jin-tang,ZHONC Zheng,KONG Gang (School of Material Science , Engineering,South China University of Technology,Guangzhou 510640,China) |
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| Abstract: | La salt conversion coating was obtained by immersing hot-dip galvanized ( HDG) steel in an aqueous solution contai-ning La( NO3)3 as the main salt. The microstructure and corro-sion resistance of the conversion coating were investigated by means of scanning electron microscopy (SKM ) , energy dispersive spectrometry (EDS) , and electrochemical impedance spectrosco-py (E1S). Results indicate that the thickness and polarization re-sistance of the La salt conversion coating increase with extending time of imme... |
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| Keywords: | lanthanum salt conversion coating rare earth hot-dip galvanized steel microstructure corrosion resistance |
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