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| Degradation Behavior of Solvent-free Epoxy Coatings in Simulated Flowing Sea Water with Sand by Different Flow Rates |
Hongtao ZHAO, Weizhong LU( ), Jing LI, Yugui ZHENG |
| Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract The degradation behavior of three solvent-free epoxy coatings on carbon steel Q345E in simulated flowing sea water with 1% (mass fraction) sand by different flow velocities (2, 4 and 6 m/s respectively) was investigated at 60 ℃ by means of open circuit potential (OCP) measurement and electrochemical impedance spectroscopy (EIS) as well as confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS). Results showed that the failure process of the three coatings was greatly shortened in the flowing slurry, and the reason for the accelerated degradation of the coatings may be ascribed to the facts that: on one hand, the wear effect of sends, which led to the generation and development of pits or holes on/in coatings which shorten the diffusion path of the corrosive medium from the outside environment to the coating/metal interface, on the other hand, the high flow rate of the slurry could accelerate the transmission of Cl- to the coating.
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Received: 23 June 2016
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| Fund: Supported by Strategic Priority Research Program of Chinese Academy of Sciences (XDA13040500) |
| About author: These authors contributed equally to this work. |
| [1] | Zhang J T.Electrochemical investigation on water transport behavior of organic coatings and degradation mechanism of coated-metals [D]. Hangzhou: Zhejiang University, 2005(张金涛. 有机涂层中水传输与涂层金属失效机制的电化学研究 [D]. 杭州: 浙江大学, 2005) | | [2] | Zhao H T, Lu W Z, Li J, et al.Electrochemical behavior of solvent-free epoxy coatingduring erosion in simulated flowing sea water[J].J. Chin. Soc. Corros. Prot., 2016, 36: 295(赵洪涛, 陆卫中, 李京等. 无溶剂环氧防腐涂层在模拟海水冲刷条件下的电化学行为[J]. 中国腐蚀与防护学报, 2016, 36: 295) | | [3] | Wang Y C, Bierwagen G P.A new acceleration factor for the testing of corrosion protective coating: flow-induced coating degradation[J]. J. Coat. Technol. Res., 2009, 6: 429 | | [4] | Zhou Q X, Wang Y C, Bierwagen G P.Flow accelerated degradation of organic clear coat: The effect of fluid shear[J]. Electrochim. Acta, 2014, 142: 25 | | [5] | Luo S Z, Lu Z J, Zheng Y G.Investigation on the relationship between erosion resistance and curing degree of epoxy powder coating[J]. J. Chin. Soc. Corros. Prot., 2000, 20: 193(骆素珍, 鲁自界, 郑玉贵. 环氧粉末涂层的冲蚀性能及其与固化度之间的关系[J]. 中国腐蚀与防护学报, 2000, 20: 193) | | [6] | Chen H H, Zhao H Y, Qu J X, et al. Erosion-corrosion of thermal-sprayed nylon coatings [J]. Wear, 1999, 233-235: 431 | | [7] | Zhang J T, Hu J M, Zhang J Q.A review on modern study methods of organic coatings[J]. Mater. Sci. Eng., 2003, 21: 763(张金涛, 胡吉明, 张鉴清. 有机涂层的现代研究方法[J]. 材料科学与工程学, 2003, 21: 763) | | [8] | Cao C N, Zhang J Q.An Introduction to Electrochemical Impedance Spectroscopy [M]. Beijing: Science Press, 2002(曹楚南, 张鉴清. 电化学阻抗谱导论 [M]. 北京: 科学出版社, 2002) | | [9] | Deflorian F, Rossi S.An EIS study of ion diffusion through organic coatings[J]. Electrochim. Acta, 2006, 51: 1736 | | [10] | Tian H W, Li W H, Zong C Z, et al.Corrosion mechanism and research progress of anti-corrosion coatings for reinforced concrete used in marine environment[J]. Paint Coat. Ind., 2008, 38(8): 62(田慧文, 李伟华, 宗成中等. 海洋环境钢筋混凝土腐蚀机理和防腐涂料研究进展[J]. 涂料工业, 2008, 38(8): 62) |
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