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| Microstructure and Corrosion Resistance of Cr-free Nanocomposite Zn/Al Coatings |
ZHU Junmou1, YAO Zhengjun1, JIANG Qiong1, WEI Dongbo1, YIN Guoxian2,
LUO Xixi1, ZHOU Wenbin1 |
1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China;
2. Jiangsu Linglong New Materials Co. Ltd., Wuxi 214100, China |
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Abstract In order to improve the corrosion resistance of chromium-free Zn/Al coating, three different nanoparticles, eg. SiO2, TiO2 and ZnO were added in the coating respectively to form nanocomposite coatings. Corrosion properties of the nanocomposite coatings were examined through salt water immersion method and electrochemical method. Furthermore, the microstructure and corrosion products of the coatings were analyzed by means of SEM and EDS. The experimental results showed that the nanoparticles dispersed in the coating in the form of flake structure which formed a more effective physical shield, extending the path of the corrosive medium to substrate. Furthermore, the fine grain strengthening was dominant to make the coating a good shielding property when nanoparticle was added. Tafel curves indicated that the nanocomposite coating with SiO2 possessed the best cathodic protection among three nanocomposite coatings, and the corrosion resistance of three nanocomposie coatings was better than that of the chromium-free Zn/Al coating.
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Cite this article:
ZHU Junmou,YAO Zhengjun,JIANG Qiong,WEI Dongbo,YIN Guoxian,
LUO Xixi,ZHOU Wenbin. Microstructure and Corrosion Resistance of Cr-free Nanocomposite Zn/Al Coatings. Journal of Chinese Society for Corrosion and protection, 2013, 33(5): 425-429.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2013/V33/I5/425
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