The work aims to investigate the aging behavior of carbon fiber reinforced composites in the typical marine at-mospheric environments.A typical carbon fiber reinforced resin matrix composite was chosen as the research object and the natural exposure test was carried out on it in the marine atmospheric environment of Qingdao,Xiamen and Sanya for 0.5 a,1 a,1.5 a and 2 a.Based on the evolution data of mechanical properties such as tensile,bending,and shear strength,the environ-mental damage factor Rr was constructed through a grey correlation analysis to comprehensively evaluate the performance deg-radation of carbon fiber reinforced composites.Furthermore,the aging damage mechanism was discussed through morphology and Fourier transform infrared spectroscopy analysis.The results show that the surface resin of carbon fiber composite under-goes aging and degradation under the influence of marine atmospheric environmental factors.This aging process mainly origi-nates from the hydrolysis of ester groups,producing polyols and polycarboxylic acid compounds.This causes the exposure of internal fibers of the composite materials,and the surface degradation thinning degree increases with time extension and latitude reduction.The environmental damage factor Rr indicates that after the long-term exposure test in Qingdao and Xiamen,the me-chanical properties decreased with time under the dominant effects of environmental"damage effect"such as photooxidative aging and humid heat aging.In Sanya,the harsh marine environment causes aging damage to composite materials earlier,and the mechanical properties monotonically decrease after 0.5 an exposure test.
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