目的 通过对氟碳彩涂板在海南文昌和云南西双版纳大气环境中曝晒后的失效行为进行对比研究，探明霉菌因素对氟碳彩涂板老化行为的影响。方法 运用扫描电子显微镜（SEM）、电化学阻抗谱（EIS）以及傅里叶变换红外光谱（FT-IR）等分析手段，对不同周期涂层试样的表面形貌和防护性能进行了监测和分析，探究海南文昌和云南西双版纳两种不同环境室外自然曝晒下，氟碳涂层的老化失效和行为。结果 SEM照片表明，随着曝晒时间的增加，两个地区涂层试样均发生不同程度的老化，且西双版纳涂层试样表面出现明显的霉菌菌落附着。EIS结果表明，与文昌试样相比，西双版纳暴晒的涂层低频阻抗模值下降较快。FT-IR结果表明，西双版纳地区氟碳涂层老化的主要原因是涂层中的丙烯酸树脂在光照和真菌等微生物共同作用下发生分子链断裂。相比之下，在光照时间、辐射强度均高于西双版纳的情况下，文昌大气暴晒后的试样表现出较好的耐候性能。结论 霉菌引起的微生物降解加速了涂层的光老化进程，使得西双版纳暴晒试样老化程度较大。

The work aims to compare the failure behavior of fluorocarbon coated plates after exposure in the atmospheric environment of Wenchang, Hainan and Xishuangbanna, Yunnan, and to explore the effects of mold on the aging behavior of flu-orocarbon coated plates. The surface morphology and protective performance of coating samples during different periods were monitored and analyzed by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and Fourier transform infrared spectroscopy (FT-IR). The aging failure and behavior of fluorocarbon coatings under the outdoor exposure of two different environments, Wenchang, Hainan and Xishuangbanna, Yunnan were explored. The SEM photographs showed that with the increase of the exposure time, the coating samples in both areas had different degrees of aging, and the surface of coating samples in Xishuangbanna showed obvious mold colony attachment. The results of EIS showed that compared with the samples in Wenchang, the low frequency impedance modulus of coatings in Xishuangbanna decreased rapidly. FT-IR results showed that the aging of the fluorocarbon coating in Xishuangbanna was mainly caused by the molecular chain breakage of the acrylic resin in the coating under the combined action of light and fungi and other microorganisms. In contrast, under the condition that the illumination time and radiation intensity were all higher than those in Xishuangbanna, samples in Wenchang exhibited better weather ability after atmospheric exposure. Therefore, the microbial degradation caused by the mold accelerates the photo-aging process of the coating and causes the serious aging of the sample exposed in Xishuangbanna.