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Effect of accelerated ageing procedures and flash rust inhibitors on the anti-corrosive performance of epoxy coatings: EIS and dynamic-mechanical analysis
Progress in Organic Coatings ( IF 6.6 ) Pub Date : 2021-06-21 , DOI: 10.1016/j.porgcoat.2021.106387
Jeferson L. Oliveira , Anders W.B. Skilbred , Andreas Loken , Ruan R. Henriques , Bluma G. Soares

The present study reports the combination of electrochemical impedance spectroscopy (EIS) technique with dynamic-mechanical (DMA) properties and pull-out strength to monitor the anticorrosive properties of high solid epoxy coatings on pre-treated carbon-steel surfaces with flash rust inhibitors. For this purpose, five different surface treatments and two epoxy system coatings were employed. The coatings were submitted to corrosion performance testing such as salt-spray, immersion in seawater and cyclic protocol in attempt to simulate marine conditions. The pull-out testing revealed mainly cohesive failure of both epoxy coating systems even after the accelerated ageing process. EIS analysis indicated an increase of the resistive characteristic of the coating after ageing treatment, which was explained by an increase of the crosslink density, as indicated by DMA analysis. The EIS results also suggested slight interfacial effect of flash rust inhibitors since they presented a major coating resistance than hydroblasted panels. Therefore, unlike the expected degradation after artificial ageing, the two high solids epoxy coating systems kept and even presented increased barrier property after ageing. Furthermore, no negative influence of wet surface preparation with or without inhibitors was observed in this study.



中文翻译:

加速老化程序和闪锈抑制剂对环氧涂料防腐性能的影响:EIS 和动态力学分析

本研究报告了电化学阻抗谱 (EIS) 技术与动态机械 (DMA) 特性和拉拔强度的结合,以监测具有闪锈抑制剂的预处理碳钢表面上高固体环氧树脂涂层的防腐性能。为此,采用了五种不同的表面处理和两种环氧体系涂层。涂层进行了腐蚀性能测试,例如盐雾、海水浸泡和循环协议,试图模拟海洋条件。拉拔测试表明,即使在加速老化过程之后,两种环氧涂层系统也主要发生内聚失效。EIS 分析表明,老化处理后涂层的电阻特性增加,这可以通过交联密度的增加来解释,如DMA分析所示。EIS 结果还表明闪锈抑制剂的轻微界面效应,因为它们表现出比水力喷砂面板主要的涂层阻力。因此,与人工老化后预期的降解不同,两种高固体份环氧涂料体系在老化后保持甚至表现出更高的阻隔性能。此外,在这项研究中没有观察到有或没有抑制剂的湿表面处理的负面影响。

更新日期:2021-06-21
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