AA5083铝合金表面处理对AA5083/低温胶胶接性能的影响  

Effects of AA5083 Surface Treatment on Bonding Performance of AA5083/Cryogenic Adhesive

作　　者：张爱爱 潘蕾[1] 张帅 王一凡 吕云飞 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京211100 [2]清华大学机械工程学院,北京100084

出　　处：《表面技术》2017年第10期179-184,共6页Surface Technology

基　　金：国家自然科学基金(51503099);国家船舶项目(新型液化天然气船液货维护系统预先研究)~~

摘　　要：目的为适应LNG船运输液化天然气时的低温工作环境,选择AA5083铝合金和外围保温材料,通过低温胶胶接的方式进行液货维护系统内部结构的搭建,保证满足基本强度要求的同时,降低生产成本。方法对AA5083铝合金进行喷砂和阳极氧化处理,对其表面形貌、表面粗糙度、表面能以及与低温胶的接触角进行表面性能表征,同时进行25、0、-60、-120℃四种不同温度下的单搭剪切力学性能测试,研究揭示不同表面处理方法对AA5083/低温胶胶接强度的影响。结果与AA5083铝合金原始试样对比,表面处理后的铝合金表面粗糙度变大,表面能升高,与低温胶的接触角变小,胶接接头强度显著提升,其中,阳极氧化后试样的胶接强度在0℃达到最大,为29.80 MPa,比原始试样提升了128.18%,比喷砂试样提升了29.90%。结论结合表面性能表征以及低温下的单搭剪切试验结果,喷砂和阳极氧化均能提高AA5083铝合金与低温胶的粘结强度,而且阳极氧化后的AA5083铝合金具有较好的综合性能。Due to cryogenic working environment of transportation for liquefied natural gas （LNG） by LNG ship, AA5083 alloy and outer thermal insulation material were selected. The work aims to build internal structure for liquid cargo maintenance system by means of cryogenic adhesive bonding, which not only guarantees basic strength requirement but also reduces produc- tion cost. Sand blasting and anodizing treatment were applied to the AA5083 alloy, surface properties including morphology, surface roughness, surface energy and contact angle with cryogenic adhesive were characterized. Meanwhile, single lap shear mechanical properties were tested at 25, 0, -60 and -120 ℃, respectively to reveal effects of different surface treatment methodson bonding strength of AA5083/cryogenic adhesive. Compared with the original AA5083 alloy specimen, surface roughness of the aluminum alloy subject to surface treatment increased, surface energy increased, contact angle with cryogenic adhesive re- duced and bonding strength improved significantly. Bonding strength of the anodized specimen reached to the maximum, 29.80 MPa at 0 ℃, 128.18% higher than that of the original specimen, 29.90% higher than that of specimen subject to sand blasting. Combined with results of surface properties characterization and single lap shear test at low temperature, both sand blasting and anodizing can improve bonding strength between AA5083 alloy and cryogenic adhesive. Moreover, the anodized AA5083 alloy exhibits better overall performance.

关 键 词：AA5083铝合金 喷砂 阳极氧化 胶接 表面性能 低温粘结强度 

分 类 号：TG174.4[金属学及工艺—金属表面处理]