Polyaniline (PANI)/epoxy composite coatings, as heavy‐duty corrosion protection coatings, might have great promise applications in marine and industrial environments. The weak weather resistance of epoxy resins, especially under the sunlight, directly reduces the service life of the epoxy composites coatings. Herein, the degradation behaviors of epoxy coatings with and without PANI nanowires in the outdoor environment were investigated by the multiple techniques and methods. The cracks occurred on the coating surface were observed by Field Emission Scanning Electron Microscopy, and the density change of the methyl group in the coatings was characterized by Attenuated Total Reflectance‐Fourier Transform Infrared spectroscopy. In addition, the mechanical properties including adhesion, hardness, flexibility and impact resistance of the coating were tested. The corrosion protection performance of epoxy coatings cooperated with and without PANI nanowires was investigated by Electrochemical Impedance Spectroscopy technique. A series of experimental results demonstrated that the degradation of the coating containing PANI nanowires was slowed down, which is attributed to that PANI nanowires served as the antioxidant and free radical scavenger in the epoxy coatings, and prolonged the service life of the epoxy resin.

中文翻译：

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环氧涂料与聚苯胺纳米线在户外环境中的降解

聚苯胺（PANI）/环氧复合涂料作为重型防腐涂料，在海洋和工业环境中可能具有广阔的应用前景。环氧树脂的耐候性差，特别是在阳光下，会直接降低环氧复合材料涂料的使用寿命。在本文中，通过多种技术和方法研究了具有和不具有PANI纳米线的环氧涂料在室外环境中的降解行为。用场发射扫描电子显微镜观察在涂层表面上产生的裂纹，并用衰减全反射傅里叶变换红外光谱法表征涂层中甲基的密度变化。此外，机械性能包括附着力，硬度，测试了涂层的柔韧性和抗冲击性。采用电化学阻抗谱技术研究了有无PANI纳米线配合使用的环氧涂料的防腐性能。一系列实验结果表明，含PANI纳米线的涂料的降解速度减慢，这归因于PANI纳米线在环氧涂料中充当抗氧化剂和自由基清除剂，并延长了环氧树脂的使用寿命。