摘要： 【目的】探究银系高导电环氧涂料对铝合金蒙皮耐腐蚀性的影响。【方法】通过极化曲线、电偶腐蚀测试研究了导电涂料对 3种状态的铝合金（裸铝合金、阳极氧化封闭铝合金、涂装防腐底漆的阳极氧化封闭铝合金）蒙皮耐腐蚀性的影响。通过中性盐雾试验考察了不同配套体系的耐腐蚀性。【结果】高导电涂料与裸铝合金和阳极氧化封闭铝合金的电位差 >0. 25 V，会引起裸铝合金表面均匀腐蚀和阳极氧化封闭铝合金表面发生点蚀；涂装防腐底漆可以降低导电涂料对铝合金电偶腐蚀的影响。【结论】涂装环氧改性聚氨酯防腐底漆（厚度>20 μm）可隔绝高导电涂料对铝合金基材电偶腐蚀的影响，提高铝合金蒙皮耐腐蚀性。
关键词:
导电涂料,
铝合金,
蒙皮,
电偶腐蚀,
银粉,
中性盐雾试验
Abstract: ［Objective］To investigate the effect of highly conductive coatings on the corrosionresistance of aluminum alloy aircraft skins.［Methods］Three types of aircraft skin surface conditions（bare aluminum alloy，anodic oxidation sealed by chromate（AAO）and anodic oxidation painted with primer）were designed based on the actual conditions of aluminum alloy skins during production andrepair. The galvanic corrosion effects of conductive coatings on anodized-sealed and primer-coatedaluminum alloy skins were studied via polarization curves and galvanic corrosion tests. A neutral saltspray test was used to evaluate the corrosion resistance of coating systems.［Results］The conductive coating contains 78. 8% flake silver powder as the conductive filler，achieving high conductivity of thecoating. The potential differences between the highly conductive coating and both bare aluminum alloyand sealed anodized aluminum alloy exceed 0. 25 V，which result in uniform corrosion on bare aluminum alloy and pitting corrosion on sealed anodized aluminum alloy. The micropores in the highlyconductive coating could establish a pathway for the diffusion of corrosive media between the conductive powder and substrates，which could cause galvanic corrosion of the bare aluminum alloy and AAO substrate during the salt spray test. The application of an anticorrosive primer effectively mitigatedthe galvanic corrosion effect of the conductive coating on aluminum alloy.［Conclusion］The highlyconductive coating can reduce the corrosion resistance of bare aluminum alloy and AAO to neutral saltspray. The use of epoxy-modified polyurethane primer（thickness should be controlled above 20 μm） can isolate the aluminum alloy substrate from galvanic corrosion induced by the highly conductivecoating and enhance the corrosion resistance of aluminum alloy skin.
Key words:
conductive coatings,
aluminum alloy,
aircraft skin,
galvanic corrosion,
silver power,
neutral salt spray test
中图分类号:
刘泽宇, 顿玉超, 李 文, 程 铭, 李少杰, 张笑尘, 韦国科, 陈亚争, 董春蕾. 银系高导电环氧涂料对铝合金蒙皮耐腐蚀性的影响[J]. 涂料工业, 2026, 56(4): 22-28.
LIU Zeyu, DUN Yuchao, LI Wen, CHENG Ming, LI Shaojie, ZHANG Xiaochen, WEI Guoke, CHEN Yazheng, DONG Chunlei. Effect of Silver-based Highly Conductive Epoxy Coatings on Corrosion Resistance of Aluminum Alloy Skin[J]. Paint & Coatings Industry, 2026, 56(4): 22-28.