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首页> 外文期刊>Journal of engineering materials and technology >Corrosion Behavior of an Anti-Icing Coating on an Aluminum Alloy: An Experimental and Numerical Study
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Corrosion Behavior of an Anti-Icing Coating on an Aluminum Alloy: An Experimental and Numerical Study

机译：铝合金抗糖合涂层的腐蚀行为：实验性和数值研究

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In this paper, a coating-substrate interfacial corrosion test method was developed to simulate and study the failure processes occurring at the coating interface as a direct consequence of environment-induced degradation or corrosion. It was found that the corrosion-induced failure rate of the coating-substrate interface upon exposure to an aggressive corrosive medium was high. Microscopic pits tend to appear at the interface of the coating and the substrate. The permeation channel at the coating interface did cause the corrosive medium, primarily the chloride ions, to gradually diffuse from the sides of the sample to the inner surface of the interface thereby enabling the initiation and continued progression of "local" corrosion. The process for failure due essentially to corrosion of the coating was established, while ensuring to include the infiltration phase, the presence of "local" corrosion phases, expansion, if any, due to corrosion, and eventually culminating in failure. Based on the experimental results, a finite element simulation of the "local" corrosion occurring at the coating interface was executed. The results revealed the microscopic pits at the interface to progressively increase the "local" stress concentration on the surface of the substrate but were found to have little influence on overall stress distribution in the coating. It was also found the shape of the etch pit had an effect on failure expansion under the influence of stress. The numerical method can be used to predict structural failure caused by corrosion pits at the interface of the coating-substrate system in an aggressive environment.
机译：在本文中，开发了一种涂层基质界面腐蚀试验方法以模拟和研究在涂层界面发生的故障过程作为环境诱导的降解或腐蚀的直接后果。发现在暴露于侵蚀性腐蚀性介质时涂层衬底界面的腐蚀引起的腐蚀率高。显微镜凹坑倾向于出现在涂层和基材的界面处。涂布界面处的渗透通道使腐蚀性介质主要是氯离子，逐渐从样品的侧面漫射到界面的内表面，从而能够启动并继续进展“局部”腐蚀。建立了根据涂层腐蚀的失效过程，同时确保包括渗透阶段，“局部”腐蚀阶段的存在，膨胀，如果有腐蚀，则最终终止于失败。基于实验结果，执行了在涂层界面处发生的“局部”腐蚀的有限元模拟。结果显示界面处的微观凹坑逐渐增加基板表面上的“局部”应力浓度，但发现对涂层中的总应力分布几乎没有影响。还发现蚀刻坑的形状对压力影响下的失效扩张产生了影响。数值方法可用于预测由涂层基板系统的界面处的腐蚀坑引起的结构破坏在激进的环境中。

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