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首页> 外文会议>International Conference on Surface Engineering; 20041029-31; Shenzhen(CN) >Lifetime prediction and failure analysis of organic coatings by EIS
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Lifetime prediction and failure analysis of organic coatings by EIS

机译：EIS对有机涂料的寿命预测和失效分析

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摘要

Organic coatings are widely used to control the corrosion of steel structure. The anticorrosive property of these coatings depends on their barrier properties) making a separation between the corrosive medium and the substrate. But unavoidable completely small pores, cracks and other defects in organic coatings may cause ions, water, gases, and other corrosive species penetrate and distribute in the coatings, causing accumulation and swelling of coatings, so leading to the degradation of coatings. In addition, water affects the permeation of oxygen and other corrosive medium, consequently the presence of such substances at coating-metal interface promotes corrosion of metal substrate. So the absorbability of the coatings to water may be one of the most important factors in undercoa-ting corrosion. In recent years, electrochemical impedance spectroscopy (EIS) has been established and frequently used as a non-destructive testing method for assessing the performance of organic coatings, especially for the determination of the water content in organic coatings, since the capacitance of the coatings is sensitive to the penetration of water. So from EIS it can extract a wealth of information on the electrochemical corrosion of coated steels, especially, it can be utilized to assess organic coatings used under particular surroundings. The principle, methods and application of EIS on evaluating life-span and analyzing failure mechanism of organic coatings are also introduced briefly. Combining other analysis techniques such as XRD, SEM and FTIR with electrochemical technique, it will blaze a way in studying degradation mechanism of organic coatings and estimating their lifetime.
机译：有机涂层被广泛用于控制钢结构的腐蚀。这些涂层的抗腐蚀性能取决于它们的阻隔性能），使腐蚀介质和基材之间发生分离。但是有机涂层中不可避免的完全小孔，裂纹和其他缺陷可能导致离子，水，气体和其他腐蚀性物质渗透并分布在涂层中，从而导致涂层积聚和溶胀，从而导致涂层退化。另外，水会影响氧气和其他腐蚀性介质的渗透，因此，此类物质在涂层与金属的界面处的存在会促进金属基材的腐蚀。因此，涂料对水的吸收能力可能是底涂腐蚀最重要的因素之一。近年来，电化学阻抗谱（EIS）已建立，并经常用作评估有机涂层性能（尤其是确定有机涂层中水含量）的无损检测方法，因为涂层的电容是对水的渗透敏感。因此，它可以从EIS中提取有关涂层钢的电化学腐蚀的大量信息，尤其是可以用来评估在特定环境下使用的有机涂层。简要介绍了EIS在评估有机涂层寿命和分析失效机理方面的原理，方法和应用。将XRD，SEM和FTIR等其他分析技术与电化学技术相结合，将为研究有机涂层的降解机理和估计其寿命开辟一种途径。

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