热喷涂锌铝涂层防腐的电化学研究

IOCAS-IR > 海洋环流与波动重点实验室

	热喷涂锌铝涂层防腐的电化学研究
	李延旭
学位类型	博士
	1999
学位授予单位	中国科学院海洋研究所
学位授予地点	中国科学院海洋研究所
学位专业	海洋化学
关键词	金属防腐表面处理海水腐蚀热喷涂
摘要	海洋环境下的钢铁设施结构的腐蚀问题一直是困扰人们的难题，而热喷涂锌铝防腐技术正是解决这一问题的重要技术之一，因此本文着重对锌铝涂层防腐进行电化学上的探讨，以期用于指导防腐的实践。对锌、铝以及三种不同组分(Zn15%Al, Zn30%Al, Zn55%Al)的合金丝制成电极进行极化曲线测试，以判别不同成分的锌铝合金的耐蚀性能, 结果表明，合金的极化特性与锌类似，合金中含铝量越高，其耐蚀性能越强。另对不同方案的热喷涂锌铝复合涂层进行了极化曲线的研究，结果表明，纯锌的腐蚀电流密度比较大，纯铝的腐蚀电流密度最小，锌铝复合层、铝镁合金、铝稀土合金的性能介于两者之间。外层为铝，内层为锌的喷涂层其极化特性与铝类似，钝化状态与铝相近。镁和稀土的加入能够改善铝的牺牲保护能力，并抑制其阴极极化过程，但没有从根本上改变铝的钝化特性。对不同方案的热喷涂锌铝复合层及其与氯化橡胶漆的覆盖层进行了156天的室内盐雾试验，以考查其耐蚀性能的优劣，并对原始试样和定期（1天，4天，8天，16天，34天，75天，156天）取出的腐蚀试样进行交流阻抗谱的测试。结果表明，单纯有机涂层的防腐能力有限，锌铝金属涂层及其与有机涂层的复合层均具有优异的防腐性能。但锌与氯化橡胶漆的配合性能较差，156天后出现较大的破裂鼓泡，而铝与有机层的配合相当得好。所有涂层方案中以喷铝并覆以有机涂层的防护方案较佳。在国内外关于锌铝复合涂层及其有机覆盖层的电化学研究比较少，因此本文在选题上具有新意。通过系统地对锌铝合金、锌铝复合层及有机涂层的防护体系进行了电化学研究，得出了满意的结论，对于指导热喷涂在实际防腐中的应用，选用最佳的防护系统，最大限度地降低腐蚀损失，具有重要意义。
其他摘要	The corrosion of steel structure under marine environment is always a confusing problem. Thermal spraying zinc-aluminum is one of the important technologies to solve this problem. This article mainly discusses about the electrochemical research into it to do a favor to the anti-corrosion practice. Zinc, aluminum and three kind of alloy silk were made into electrodes. Potentiostat polarization tests were made on them and polarization curves were plotted to judge their anti-corrosion performance. The result showed that their polarization property is very similar with zinc. Conclusion also came that the more aluminum percentage the alloy has, the higher performance it owns. Polarization tests were also made on different kinds of complex coatings of thermal spraying zinc and aluminum. It showed that the corrosion current density of pure zinc was relatively higher while that of aluminum was the least. The performance of complex coating of zinc-aluminum, aluminum-magnesium, and aluminum-rare earth elements laid between the two former ones. The spraying coating which had an outer layer of aluminum and an inner layer of zinc had a property similar with aluminum and its passivation state similar with aluminum. The addition of magnesium and rare-earth elements to aluminum could enhance its anodic protection ability. But it could not change the essential passivation property of aluminum. An indoor salt spraying test on different kinds of complex coatings of thermal spraying zinc-aluminum as well as with chloridized rubber paint lasted for 156 days so as to test their anti-corrosion performance. Also electrochemical impedance spectroscopy data were acquired from the initial specimen and the periodically taken-out corrosion specimen. It showed that the pure organic coating had a limited anti-corrosion ability. Zinc-aluminum complex coatings as well as with organic coating had excellent anti-corrosion performance. But zinc coating has worse cooperation with organic coating. It showed big broken bubbles on its surface in the duration of the test. Yet the aluminum did well. The result was that anti-corrosion design which had a spraying layer of aluminum and an organic coating worked best. There are only a few electrochemical studies on the anti-corrosion performance of zinc-aluminum complex coatings and organic coating wherever in China or abroad. So it is an initiative subject. An electrochemical research was held systematically on the zinc-aluminum alloy, zinc-aluminum complex coatings and organic coatings and a satisfactory result was made. It has great importance since it can guide the application of thermal spraying in anti-corrosion practice and can help make the decision of selecting the best anti-corrosion system.
页数	63
语种	中文
文献类型	学位论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/503
专题	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	李延旭. 热喷涂锌铝涂层防腐的电化学研究[D]. 中国科学院海洋研究所. 中国科学院海洋研究所,1999.

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