碳纤维增强环氧树脂复合材料盐雾腐蚀行为及其老化分子机制  

Salt-Spray Corrosion Behavior and Aging Molecular Mechanism of Carbon Fiber Reinforced Epoxy Resin Composites

作　　者：李玥 叶林[1] 赵晓文[1] Yue Li;Lin Ye;Xiaowen Zhao(State Key Laboratory of Polymer Materials Engineering,Polymer Research Institute of Sichuan University,Chengdu 610065,China)

机构地区：[1]高分子材料工程国家重点实验室(四川大学),四川大学高分子研究所,四川成都610065

出　　处：《高分子材料科学与工程》2023年第5期91-97,共7页Polymer Materials Science & Engineering

基　　金：基础计划加强重点基础研究项目(JG2019272)。

摘　　要：碳纤维增强环氧树脂复合材料(CFRP)综合性能优异,广泛用于国防军工、航空航天等领域。文中针对CFRP在海洋气候环境下的实际应用需求,研究了具有产品结构特征的NOL环及层压板试样在高温、高浓度盐雾(55℃,10%NaCl)条件下的盐雾腐蚀行为,并通过研究材料在老化过程中的吸湿行为、盐分扩散行为及树脂分子/交联网络结构及体系界面结构的演变,探究了其老化分子机理及界面损伤机制。其老化过程可分为3个阶段,在此期间水分子对树脂的溶胀与塑化作用、纤维-基体湿膨胀系数不匹配诱发的界面损伤作用及盐分/水分对树脂的腐蚀断链作用均可导致体系交联密度降低、界面脱粘及基体破碎,诱使材料力学及界面强度劣化。老化90 d后,NOL环及层压板试样的层间剪切强度(ILSS)保留率分别为73.75%及84.10%。Carbon fiber reinforced epoxy resin composites(CFRP)exhibit comprehensive excellent properties and are widely used in military industry,aerospace,etc.In this work,for the practical application of CFRP in marine environment,the salt-spray corrosion behavior of the NOL ring and laminates with product structure characteristics was investigated under high temperature and high concentration salt spray(55℃,10%NaCl)conditions.By studying the relative weight gain,salt diffusion behavior,evolution of molecular/cross-linking network structure and interfacial structure of CFRP during aging,the aging molecular mechanism and interfacial damage mechanism were explored.The aging process of CFRP can be divided into three stages,during which the swelling and plasticizing effects of water on the resin matrix,the mismatch of expansion coefficient between fiber and resin matrix,and the corrosion effect of the salt-spray lead to the decrease of cross-linking density,debonding of the interface and fragment of the resin matrix,and thus induce the deterioration of mechanical property and interface strength.After aging for 90 d,the retention ratios of the interlaminar shear strength(ILSS)of the NOL ring and laminate are 73.75%and 84.10%,respectively.

关 键 词：碳纤维增强环氧树脂复合材料 盐雾腐蚀行为 界面损伤 老化分子机制 

分 类 号：TQ327.3[化学工程—合成树脂塑料工业]