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Synergetic effects of photo-oxidation and biodegradation on failure behavior of polyester coating in tropical rain forest atmosphere

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Journal of Materials Science & Technology 2021年第5期64卷 195-202页

作者： Lin Lu Qianqian Liu Corrosion and Protection Center University of Science and Technology BeijingBeijing100083China State Key Laboratory of Metal Material for Marine Equipment and Application Anshan114000China

This work aimed to study the comprehensive effects of photo-oxidation and biodegradation on different failure stages of polyester coatings,which were exposed to the tropical rainforest *** surface morphology,aging products,local aging characteristics and electrochemical behavior of the coatings were characterized with scanning electron microscope(SEM),fourier transform infrared spectroscopy(FTIR),electrochemical impedance spectroscopy(EIS)and high-resolution dispersive Raman *** results showed that the surface of coatings became rougher and fungal hyphae distributed more densely on surface with the increasing of exposure *** the aspect of polymer structure,the ultraviolet radiation destroyed the main chain of polyester through the photo-oxidation process,resulting in the breakage of aliphatic ester bonds and the formation of ***,the metabolites of fungi can promote the hydrolysis of oligomers produced by the *** a short,the photo-oxidation could facilitate the biodegradation of the *** the synergistic effect of UV photo-oxidation and fungal biodegradation,a rapid diffusion tunnel between the coating surface and the metal substrate was established at the pore defects of the coating,which finally accelerated the corrosion failure process of the *** main corrosion products includeα-Fe_(2)O_(3),ZnO and Zn_(5)(OH)_(6)(CO_(3))_(2).

关键词： polyester coating Fungus Biodegradation Photo-oxidation Microbiologically influenced corrosion Tropical rainforest

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