SUN Xiangtai.Study on Failure Evolution Behavior of Epoxy Coating Based on Beam Electrode Technology[J].Plating & Finishing,2021,(4):25-29.[doi:10.3969/j.issn.1001-3849.2021.04.006]
基于丝束电极的环氧涂层失效演变行为研究
- Title:
- Study on Failure Evolution Behavior of Epoxy Coating Based on Beam Electrode Technology
- 文献标志码:
- A
- 摘要:
- 本文采用丝束电极测试方法，结合图像表征，分析了腐蚀介质扩散引起的涂层失效过程和金属基体的腐蚀形貌特征。结果表明，涂层失效起始于失效位点，即水分子优先到达涂层/金属界面的位置，因此“大阴极、小阳极”腐蚀原电池和氧浓差电池的形成促进了金属基体点蚀的发展。当界面上电化学反应全面展开，腐蚀产物向涂层中扩散堵塞扩散通道，此时涂层体系电位大幅度负向偏移且保持稳定，并且涂层剥离。
- Abstract:
- In this paper, the epoxy coating failure process and the corrosion morphology of metal matrix were analyzed using the method of beam electrode technology and image characterization. The results showed that the coating failure began at the failure point where the water molecules preferentially reach the coating/metal interface, so the formation of "large cathode, small anode" corrosion galvanic cell and oxygen concentration difference cell promoted the pitting corrosion characteristics of the metal matrix. When the electrochemical reaction was fully developed on the interface, the corrosion product diffused into the coating and blocked the diffusion channel, at this time, the coating system potential was significantly negatively shifted and remains stable, and the coating was stripped off.
参考文献/References:
[1] Yong J T, Stuart B, Brian K. Mapping non-uniform corrosion using the wire beam electrode method. III. Water-line corrosion [J]. Corrosion Science, 2001, 43: 1931-1937.
[2] Le T Q, Bonnet G, Compere C, et al. Modified wire beam electrode: a useful tool to evaluate compatibility between organic coatings and cathodic protection [J]. Progress in Organic Coatings, 2005, 52: 118-125.
[3] Tan Y J, Wang T. Understanding electrodeposition of polyaniline coatings for corrosion prevention applications using the wire beam electrode method [J]. Corrosion Science, 2006, 48: 2274-2290.
[4] Tan Y J. Wire beam electrode: a new tool for studying localised corrosion and other heterogeneous electrochemical processes [J]. Corrosion Science, 1999, 41: 229-247.
[5] Battocchi D, He J, Bierwagen G P, et al. Emulation and study of the corrosion behavior of Al alloy 2024-T3 using a wire beam electrode (WBE) in conjunction with scanning vibrating electrode technique (SVET) [J]. Corrosion Science, 2005, 47: 1165-1176.
[6] Tan Y J. An overview of techniques for characterizing inhomogeneities in organic surface films and underfilm localized corrosion [J]. Progress in Organic Coatings, 2013, 76: 791-803.
[7] Liu B, Fang Z G, Wang H B, et al. Effect of cross linking degree and adhesion force on the anti-corrosion performance of epoxy coatings under simulated deep sea environment [J] .Progress in Organic Coatings, 2013, 76: 1814-1818.
[8] Jeon H, Park J, Shon M. Corrosion protection by epoxy coating containing multi-walled carbon nanotubes [J]. Journal of Industrial and Engineering Chemistry, 2013, 19: 849-853.
[9] Zheng S, Li J. Inorganic-organic sol gel hybrid coatings for corrosion protection of metals [J]. Journal of Sol-Gel Science and Technology, 2010, 54: 174-187.
[10] Ecco L G, Fedel M, Ahniyaz A, et al. Influence of polyaniline and cerium oxide nanoparticles on the corrosion protection properties of alkyd coating. Progress in Organic Coatings, 2014, 77 (12): 2031-2038.
[11] Hammer P, Santos F C, Cerrutti B M, et al. Highly corrosion resistant siloxane-polymethyl methacrylate hybrid coatings [J]. Journal of Sol-Gel Science and Technology, 2012, 63: 266-274.
[12] Liu L, Cui Y, Li Y, et al. Failure behavior of nano-SiO2 fillers epoxy coating under hydrostatic pressure [J]. Electrochimica Acta, 2012, 62: 42-50.
[13] Eliyan F F, Mahdi E S, Alfantazi A. Electrochemical evaluation of the corrosion behavior of API-X100 pipeline steel in aerated bicarbonate solutions [J]. Corrosion Science, 2012, 58: 181-191.
[14] Li Z L, Yang C, Cui G, et al. Effect of pH and NaCl concentration on the hydrogen evolution reaction of X60 steel [J]. Anti-Corrosion Methods and Materials, 2019, 66(2): 203-209.
[15] Musiani M, Orazem M E, Pébère N, et al. Constant-phase-element behavior caused by coupled resistivity and permittivity distributions in films [J]. Journal of The Electrochemical Society, 2011, 158(12): C424-C428.
[16] Kumar S, Samal S K, Mohanty S, et al. Curing kinetics of bio-based epoxy resin-toughened DGEBA epoxy resin blend [J]. Journal of Thermal Analysis and Calorimetry, 2019, 137: 1567-1578.
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备注/Memo
收稿日期：2020-10-27；修回日期：2021-01-20
作者简介：孙祥太（1989-），男，工程师，主要从事长输天然气管道运行及管理、管道腐蚀与防护研究，Email：476460890@qq.com