目的：研究聚氨酯涂层在三亚室外自然曝晒实验和氙灯老化实验中的失效行为，探讨两种实验条件下聚氨酯涂层光泽度的对应关系。方法利用红外光谱、金相显微镜、扫描电镜等分析手段研究三亚室外自然曝晒和氙灯老化条件下聚氨酯涂层的老化失效规律和行为。结果以聚氨酯涂层完全失去光泽为基准计算，相对于三亚室外自然曝晒实验，氙灯老化实验对聚氨酯涂层老化失效的加速因子约为4.3。结论聚氨酯涂层在实海暴露实验和氙灯老化实验失效过程中表面形貌相似、劣化机理一致，可以用氙灯老化实验模拟三亚室外自然曝晒实验。%Objective To study failure behaviors of the polyurethane coating in Sanya outdoor exposure experiments and xenon lamp aging experiments, and analyze the relationships of gloss between xenon lamp aging experiments and Sanya outdoor exposure experiments. Methods The aging failure rule and behavior of the polyurethane coating in Sanya outdoor exposure experiments and xenon lamp aging experiments were investigated by infrared spectroscopy, metallographic microscopy and scanning electron microscopy. Results Relative to Sanya outdoor exposure, with the complete gloss loss of polyurethane coating as a basis for calculation, the accelerated factor of xenon lamp aging on polyurethane coating failure was about 4.3. Conclusion It indicated that the surface morphology of polyurethane coatings in xenon lamp aging and Sanya outdoor exposure experiments was similar, and the degradation mechanism was consistent. Xenon lamp aging experiments could simulate seawater exposure experiments.
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