Electrochemical Study on Corrosion Damage of 7B04 Aluminum Alloy/Anodic Film/Epoxy Coating System in Simulated Marine Atmospheric Environment

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Pub Date : 2023-07-12 DOI:10.5006/4380

H. Ji, Xiaobing Ma, Yikun Cai, Han Wang

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Abstract

This paper investigates the electrochemical characteristics of the 7B04 aluminum alloy/anodic film/epoxy coating system in a simulated marine atmosphere using electrochemical techniques and surface morphology measurements. The coating system underwent a periodic immersion test for 480 hours to simulate the harsh service conditions in a marine environment. Three equivalent circuit models were proposed based on the analysis of the electrochemical failure mechanism of the coating system. AIC (Akaike Information Criterion) and BIC (Bayesian Information Criterion) were used to selectively choose models for different degradation stages of the coating system, revealing its electrochemical degradation characteristics. Two-stage aging kinetics and Gamma models were proposed to describe the time-varying processes of electrochemical low-frequency impedance and corrosion trend, respectively. Ultimately, low-frequency impedance is identified as the most effective and rapid evaluation index for coating performance due to its strong correlation with corrosion trends. The aforementioned models and index provide a foundation for accurately identifying corrosion stages and effectively predicting the corrosion process.

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模拟海洋大气环境中7B04铝合金/阳极膜/环氧涂层体系腐蚀损伤的电化学研究

本文利用电化学技术和表面形貌测量，研究了7B04铝合金/阳极膜/环氧涂层体系在模拟海洋大气中的电化学特性。涂层系统进行了480小时的周期性浸渍测试，以模拟海洋环境中的恶劣使用条件。在分析涂层体系电化学失效机理的基础上，提出了三种等效电路模型。采用AIC（Akaike Information Criterion）和BIC（Bayesian Information Criterium）对涂层体系不同降解阶段的模型进行了选择性选择，揭示了涂层体系的电化学降解特性。提出了两阶段老化动力学和Gamma模型，分别描述了电化学低频阻抗和腐蚀趋势的时变过程。最终，低频阻抗被确定为最有效、最快速的涂层性能评估指标，因为它与腐蚀趋势有很强的相关性。上述模型和指标为准确识别腐蚀阶段和有效预测腐蚀过程提供了基础。

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来源期刊

Corrosion MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING

CiteScore

2.80

自引率

12.50%

发文量

审稿时长

3 months

期刊介绍： CORROSION is the premier research journal featuring peer-reviewed technical articles from the world’s top researchers and provides a permanent record of progress in the science and technology of corrosion prevention and control. The scope of the journal includes the latest developments in areas of corrosion metallurgy, mechanisms, predictors, cracking (sulfide stress, stress corrosion, hydrogen-induced), passivation, and CO2 corrosion. 70+ years and over 7,100 peer-reviewed articles with advances in corrosion science and engineering have been published in CORROSION. The journal publishes seven article types – original articles, invited critical reviews, technical notes, corrosion communications fast-tracked for rapid publication, special research topic issues, research letters of yearly annual conference student poster sessions, and scientific investigations of field corrosion processes. CORROSION, the Journal of Science and Engineering, serves as an important communication platform for academics, researchers, technical libraries, and universities. Articles considered for CORROSION should have significant permanent value and should accomplish at least one of the following objectives: • Contribute awareness of corrosion phenomena, • Advance understanding of fundamental process, and/or • Further the knowledge of techniques and practices used to reduce corrosion.