Effects of lanthanum addition on corrosion resistance of hot-dipped galvalume coating
来源期刊：JOURNAL OF RARE EARTHS2009年第1期
论文作者：HAN Qing YANG Dong CHEN Jianshe LIU Kuiren
Key words：lanthanum; galvalume coating; weight loss; weak polarization curves; electrochemical impedance spectroscopy; rare earths;
Abstract: Effects of La addition on corrosion resistance of hot-dipped galvalume coating steel wire were investigated. The corrosion resistance of Zn-Al-Si-La alloy coatings containing 0, 0.02wt.%, 0.05wt.%, 0.1wt.% and 0.2wt.% La were evaluated by various tests such as copper-accelerated acetic acid salt spray testing (CASS), immersion test in 3.5% NaCl solution, electrochemical tests including weak polarization curves and electrochemical impedance spectroscopy (EIS) tests, scanning electron microscope (SEM) test and X-ray diffraction (XRD) test. It was found that the corrosion resistance of galvalume coating could be improved by adding proper amounts of La. Meanwhile, the mechanism of the improvement of corrosion resistance by La addition was discussed.
HAN Qing1，YANG Dong1，CHEN Jianshe1，LIU Kuiren1
(1.School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China)
Abstract:Effects of La addition on corrosion resistance of hot-dipped galvalume coating steel wire were investigated. The corrosion resistance of Zn-Al-Si-La alloy coatings containing 0, 0.02wt.%, 0.05wt.%, 0.1wt.% and 0.2wt.% La were evaluated by various tests such as copper-accelerated acetic acid salt spray testing (CASS), immersion test in 3.5% NaCl solution, electrochemical tests including weak polarization curves and electrochemical impedance spectroscopy (EIS) tests, scanning electron microscope (SEM) test and X-ray diffraction (XRD) test. It was found that the corrosion resistance of galvalume coating could be improved by adding proper amounts of La. Meanwhile, the mechanism of the improvement of corrosion resistance by La addition was discussed.
Key words:lanthanum; galvalume coating; weight loss; weak polarization curves; electrochemical impedance spectroscopy; rare earths;
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