| 钴对热浸镀锌层耐腐蚀性的影响 |
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| 引用本文： | 李淑英,刘永雄,李发国,胡静娴,尹付成.钴对热浸镀锌层耐腐蚀性的影响[J].湖南文理学院学报(自然科学版),2012(2):64-67,72. |
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| 作者姓名： | 李淑英 刘永雄 李发国 胡静娴 尹付成 |
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| 作者单位： | 湘潭大学机械工程学院材料设计及制备技术湖南省重点实验室;衡阳财经工业职业技术学院机械工程系 |
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| 基金项目： | 教育部博士点基金(20114301110005);湘潭大学自然科学研究项目(10XZX15) |
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| 摘 要： | 通过5 wt%NaCl溶液浸泡腐蚀实验和电化学极化实验测量了热浸锌镀层的腐蚀速率和极化曲线,采用光学显微镜、扫描电镜SEM观察了镀层腐蚀后表面的显微组织,初步探讨了腐蚀机理.研究结果表明:锌浴中加入钴的合金镀层抗腐蚀能力要强于纯锌浴镀层;在盐水腐蚀溶液中,锌镀层能够阻滞腐蚀保护基体的主要原因,是牺牲阳极锌和在镀层表面形成了一层由ZnO和ZnCl2.4Zn(OH)2组成的钝化膜;当锌浴中添加适量钴元素后,在镀层中会形成富钴层,可以阻碍镀层的腐蚀,也有利于稳定腐蚀初期生成的Zn(OH)2或ZnCl2.4Zn(OH)2,降低腐蚀电流,提高镀层的耐腐蚀性能.
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| 关 键 词： | 钴 热浸镀锌层 耐腐蚀性 |
Effect of Co in Zn bath on the corrosion resistance of galvanizing coating |
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| LI Shu-ying,LIU Yong-xiong,LI Fa-guo,HU Jing-xian,YIN Fu-cheng.Effect of Co in Zn bath on the corrosion resistance of galvanizing coating[J].Journal of Hunan University of Arts and Science:Natural Science Edition,2012(2):64-67,72. |
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| Authors: | LI Shu-ying LIU Yong-xiong LI Fa-guo HU Jing-xian YIN Fu-cheng |
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| Institution: | 1(1.Key Laboratory of Materials Design and Preparation Technology of Hunan Province,School of Mechanical Engineering,Xiangtan University,Xiangtan 411105,China;2.Department of Mechanical Engineering,Hengyang Finance and Economics Industry Occupation Technical College,Hengyang 421002,China.) |
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| Abstract: | The corrosion resistance of the galvanizing coatings was studied by 5 wt% NaCl solution immersion test and electrochemical polarization.The microstructures of eroded coatings were investigated by means of optical microscopy and SEM.The results shows that Co addition in Zn bath could improve the tarnish resistance of galvanizing coating.In erosive solution,the Zinc coatings protected steels from corrosion mostly by eroding anode zinc first and shaping some surface passivation films of ZnO and ZnCl2.4Zn(OH)2on the coatings.When Co addition in Zn bath,it formed a Co-rich layer which could play a barrier layer role,on the other hand,Co can stabilify Zn(OH)2 and ZnCl2.4Zn(OH)2 which produced in earlier corrosion,and reduce electric current of corrosion.So it improved the tarnish resistance of hot-dipping Zn-Co coating. |
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| Keywords: | Co hot-dipping galvanized coating corrosion resistance |
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