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国产热浸锌锚链的耐蚀性研究(Ⅱ):热浸锌材料的腐蚀性能
马士德1,2, 孙森峰3, 刘欣4, 严清冉5, 李丽娜5, 许健平5, 王启冉5, 程坤4, 李博亮5, 陈仁娟5, 苟晓超5, 段继周1
1.中国科学院海洋研究所 海洋环境腐蚀与生物污损重点实验室, 青岛 266071;2.中国老教授协会海洋防腐防污专业委员会, 青岛 266071;3.青岛锚链股份有限公司, 青岛 266200;4.青岛科技大学, 青岛 266042;5.青岛东启机械设备有限公司, 青岛 266071
摘要:
本文以热浸锌处理的CM系列钢为研究对象,通过盐雾处理进行了加速腐蚀试验,利用电化学极化测试分析了材料的腐蚀机理,利用扫描电镜和三维数字显微镜观察了材料的表面形貌。盐雾加速试验表明,随着时间增长腐蚀速度降低,主要是由于腐蚀产物膜抑制了腐蚀的阳极过程和阴极过程(产生钝化平台)。厌氧环境下的试验表明,在细菌繁殖到达高峰时产生了钝化平台,主要是形成致密、溶解度极小的ZnS腐蚀产物,在电极表面形成连续完整的腐蚀产物膜。以99.99%纯锌为原料的热浸锌产品在港湾海洋环境中有高的耐蚀性,其原因是由于腐蚀产物及锌-铁合金层的保护作用。
关键词:  热浸锌  腐蚀  电化学实验
DOI:10.12036/hykxjk20170606001
分类号:TG174
基金项目:国家自然科学基金(59471054,59071040);国家重点基础研究项目(2014CB643304)。
Research on the Corrosion Resistance of Domestic Hot-Dip Galvanized Chain (Ⅱ): Corrosion Resistance of Hot-Dip Galvanized Material
MA Shi-De1,2, SUN Sen-Feng3, LIU Xin4, YAN Qing-Ran5, LI Li-Na5, XU Jian-Ping5, WANG Qi-Ran5, CHENG Kun4, LI Bo-Liang5, CHEN Ren-Juan5, GOU Xiao-Chao5, DUAN Ji-Zhou1
1.Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.China Association of Professors of the Old Marine Anti-fouling and Anti-fouling Specialized Committee, Qingdao 266071, China;3.Qingdao Chain Co., Ltd, Qingdao 266200, China;4.Qingdao University of Science and Technology, Qingdao 266042, China;5.Qingdao Dongqi Mechanical Equipment Co., Ltd, Qingdao 266071, China
Abstract:
In this paper, a hot-dip zinc specimen of CM series steel was used as the test material. First, for the accelerated salt spray corrosion test, the hot-dip zinc was sprayed with a 5% NaCl solution at a constant temperature of 35℃ and photographs were clicked to record the state of the surface. Next, an electrochemical polarization test was performed in a seawater electrolyte, and the zinc coating was observed using SEM to investigate the corrosion mechanism. In addition, the morphology of the hot-dip zinc material was observed using a three-dimensional digital microscope and a further electrochemical polarization experiment was performed in an anaerobic bacterial environment. The results of the accelerated salt spray test indicated that the corrosion rate decreased with an increase in time; this occurred mainly because the corrosion product film inhibited the corrosion anode and cathode processes (passivation platform). Experiments under anaerobic conditions showed that the passivation platform was formed when the bacteria grew to their peak. This was mainly due to the formation of dense ZnS corrosion products on the electrode surface as these products formed a continuous and complete corrosion product film. Hot-dipped zinc products containing 99.99% pure zinc as the raw material show high corrosion resistance in the marine environment because of the protection of the corrosion products and the zinc-iron alloy layer. The salt spray and electrochemical polarization tests can be used as quick methods to evaluate the corrosion resistance of zinc coatings.
Key words:  hot-dip galvanized  corrosion  electrochemical experiments
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