Study On The Property Evolution Of CFRP Plates In Corrosive Environment

Pipeline transportation is a common mode of transportation in the chemical industry.At present,part of China's pipeline system has been "aging problem",and pipeline repair has become an important issue in the industry.Carbon fiber composite(CFRP)can avoid the disadvantages of traditional repair methods,and has the characteristics of simple operation,high safety coefficient and economic cost.It has been widely used in the field of pipeline repairing.Due to the complex working environment and long service life of the pipeline system,the durability of CFRP composites has become an important issue in repairing.The paper makes use of vacuum molding method to prepare CFRP sheets of high performance,and from the perspective of materials,by means of the temperature accelerated aging theory,the long-term durability of CFRP sheet and high temperature resistant resin matrix under water and corrosive environment(strong acid solution,strong alkali solution)was studied,obtaining performance evolution and degradation mechanism.The results show that the mechanical properties of CFRP plate decreased little at low temperature(20? and 40?).In the water,strong alkali environment,there was no obvious degradation of resin matrix,but in the strong acid resin the matrix destruction is obvious.Water absorption behavior tends to be balanced in the later stage of water absorption,which is consistent with the law of Fick law.The interface properties did not degrade obviously in water and strong acid environment,but in strong alkali environment.Under high temperature(60?),the mechanical properties of CFRP plates shows significant degradation.The resin matrix turns up heavy degradation,and the water absorption increase in the water and acid environment conforming to the Law of two-stage,but decrease in the alkali environment deviating with the Fick law.The interface degrades in every environment,especially in alkaline environment.Compared with immersion in water environment,CFRP plate degradation is more obvious in strong alkali environment,followed by the one in strong acid environment.The degradation of CFRP sheet in acid environment is mainly due to the destruction of resin matrix,the degradation in alkali environment is mainly due to the interface debonding between fiber and resin,followed by the destruction of resin matrix.