铝合金防冰涂层的腐蚀行为:实验与数值研究

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL
Wei Zhang, S. Lv, Yijing Lv, Xiaosheng Gao, T. Srivatsan
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引用次数: 0

摘要

本文提出了一种涂层-基体界面腐蚀试验方法,用于模拟和研究涂层界面在环境降解或腐蚀的直接后果下的失效过程。结果表明,暴露在强腐蚀性介质中,涂层-基体界面的腐蚀失效率很高。微观凹坑往往出现在涂层和基体的界面上。涂层界面处的渗透通道确实使腐蚀介质,主要是氯离子,逐渐从样品的侧面扩散到界面的内表面,从而使“局部”腐蚀的开始和持续发展成为可能。建立了主要由于涂层腐蚀而导致的失效过程,同时确保包括渗透阶段,“局部”腐蚀阶段的存在,由于腐蚀而产生的膨胀,以及最终的失效。基于实验结果,对涂层界面发生的“局部”腐蚀进行了有限元模拟。结果表明,界面处的微观凹坑逐渐增加了基体表面的“局部”应力集中,但对涂层内的整体应力分布影响不大。在应力作用下,腐蚀坑的形状对破坏扩展也有影响。该数值方法可用于预测腐蚀环境下涂层-基体界面处的腐蚀坑引起的结构破坏。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Corrosion Behavior of an Anti-Icing Coating on an Aluminum Alloy: An Experimental and Numerical Study
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.
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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