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[目的]研究2A97铝锂合金有机防护涂层在南海严苛海洋大气环境下的耐久性，为其在航空装备中的涂层选材与应用提供数据支持。[方法]通过户外曝露试验，结合宏观与微观形貌观察、光泽度与色差统计、电化学阻抗谱(EIS)分析，研究了经硫酸阳极氧化与环氧底漆涂层联合防护处理的铝锂合金试样在南海海洋大气环境中曝露0.5～2.0 a后的老化行为。[结果]随曝露时间延长，涂层表面微坑数量与面积持续增加，失光率和色差显著上升，低频阻抗模值下降。[结论]2A97铝锂合金表面硫酸阳极氧化+环氧底漆在南海严苛海洋大气环境中曝露2.0 a内涂层逐渐发生老化，主要由涂层中亲水基团的水解降解与光降解共同引起。
Abstract：[Objective] The durability of organic protective coatings on 2A97 aluminum–lithium alloy in harsh marine atmosphere of South China Sea was studied to provide data support for coating selection and application in aviation equipment. [Method] The aging behavior of Al–Li alloy specimens treated via sulfuric acid anodizing followed by epoxy primer coating after 0.5 to 2.0 years of exposure in South China Sea marine atmosphere was studied through outdoor exposure test, combined with macro/microscopic morphology observation, glossiness and color difference measurement, and electrochemical impedance spectroscopy(EIS). [Result] With the extending of exposure time, the number and area of micro-pits on coating surface continuously increased, the glossiness loss and color difference of coating significantly rose, and the low-frequency impedance modulus decreased. [Conclusion] The coating on 2A97 Al–Li alloy surface treated by sulfuric acid anodizing and epoxy primer coating gradually aged within 2 years of exposure in the harsh marine atmosphere of South China Sea, primarily due to the combined effects of hydrolytic degradation of hydrophilic groups and photodegradation in the coating.
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基本信息:
DOI：10.19289/j.1004-227x.2026.01.003
中图分类号:V261.933;TG174.4
引用信息:
[1]贾静焕,李钊,詹中伟,等.2A97铝锂合金防护涂层在严苛海洋环境下的老化行为研究[J].电镀与涂饰,2026,45(01):15-20.DOI:10.19289/j.1004-227x.2026.01.003.
基金信息:
十四五国防技术基础项目资助（JSHS2020209B001-1）; 北京市自然科学基金资助（2244110）