Hygrothermal resistance of CFRP composites in water,acid and alkali environments
The degradation of carbon fiber reinforced epoxy polymer(CFRP)composites in corrosive environment is the key to the service security of materials and structures.In order to obtain the aging resistance of CFRP plate in corrosive solution,CFRP plate is immersed in water,acid and alkali solution for 150 days.The long-term performance evolutions of CFRP plate are obtained by water absorption,thermal and mechanical tests,microstructure analysis.The results show that the water absorption behavior of resin plate is similar to that of CFRP plate in water,acid and alkali solution.In the acid solution,both the resin and CFRP plate have higher water absorption,which is because the acid solution promotes the resin relaxation and provides more space for the further ingress of water molecules.In addition,the resin hydrolysis reduces the water absorption of resin and CFRP plate.The long-term accelerated aging leads to a degradation of up to 29.7％in the tensile strength and 12.4％in the glass transition temperature of CFRP plates.The resin plasticization and hydrolysis,the interface debonding between fiber and resin are the main factors causing the degradation of tensile strength of CFRP plate.The alkali solution accelerates the debonding of the fiber resin interface and resin hydrolysis,which leads to a much greater degradation of the tensile strength of CFRP sheets soaked in alkaline solution than in water and acid solution.The glass transition temperature of CFRP plate is mainly controlled by the resin plasticization.The degradation degree of glass transition temperature in acid solution is much greater than that of water and alkali solution,which is because CFRP plate has higher water absorption in acid solution,resulting in more serious resin plasticization.
CFRP compositescorrosive solutionperformance evolutionsresin plasticization and hydrolysisin-terface debonding
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