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以氙灯为光源,对丙烯酸聚氨酯涂层/碳钢体系进行人工加速老化实验,用傅里叶变换红外光谱仪(FTIR)、光学显微镜和光泽仪对老化的涂层进行分析表征,用盐雾实验测试涂层老化后的防腐性能,初步探讨了光辐射对涂层保护性能的影响.结果表明,不同老化周期的体系在盐雾实验后,表面涂层的保护状态均基本完好,但膜下金属腐蚀程度随老化时间的增加而加剧.其原因是:光辐射使涂层中C—N键断裂,且随老化时间的延长,涂层表面粗糙程度增加,光泽度下降;涂层化学结构及表面状态的变化加速了腐蚀介质在涂层中的渗透,从而导致膜下金属腐蚀加重.
The accelerated aging experiment of acrylic urethane coating / carbon steel was carried out with xenon lamp as the light source. The aged coating was characterized by Fourier transform infrared spectroscopy (FTIR), optical microscope and gloss meter. The effects of optical radiation on the protective properties of the coatings were investigated preliminarily.The results showed that the protective coatings of the coatings with different aging cycles were basically intact after the salt spray test, The reason is: the light radiation causes the C-N bond in the coating to rupture, and with the aging time prolongs, the coating surface roughness increases and the gloss decreases; the chemical structure and the surface state of the coating The changes accelerated the penetration of corrosive media into the coating, resulting in increased corrosion of the metal under the coating.