常压空气等离子处理对铝合金胶接接头强度的影响

发布时间：2018-08-09 10:40

【摘要】：为改善铝合金表面润湿性与胶接强度,采用常压空气射流等离子体对5052铝合金进行表面处理。通过接触角测试,表面自由能计算和胶接接头剪切强度测试表明处理时间对铝合金表面改性效果影响不大,随着处理距离减短,铝合金表面自由能、胶接接头强度均逐步提升。处理距离为5 mm时等离子处理铝合金获得最佳表面改性效果,铝合金胶接接头剪切强度由10.6 MPa提升至19.3 MPa,失效模式由界面失效转变为内聚失效。利用SEM,XPS,傅立叶变换红外光谱等检测手段分析不同处理距离对应表面理化特性的变化,结果表明:处理距离较远时,等离子体并未改变铝合金表面物理形貌,其主要改性效果体现为表面清洗;处理距离较近时,铝合金表面高温熔融产生复杂微结构的粗糙氧化层,同时氧化层表面吸附羟基等极性官能团,显著提升了其表面自由能与胶接强度。
[Abstract]:In order to improve the wettability and bonding strength of aluminum alloy surface, the surface of 5052 aluminum alloy was treated by atmospheric pressure air jet plasma. The calculation of surface free energy and shear strength test of adhesive joint show that the treatment time has little effect on the surface modification of aluminum alloy. With the reduction of treatment distance, the surface free energy of aluminum alloy and the strength of adhesive joint are increased gradually. When the treatment distance is 5 mm, the best surface modification effect is obtained by plasma treatment. The shear strength of adhesive joint of aluminum alloy is increased from 10.6 MPa to 19.3 MPA, and the failure mode is changed from interface failure to cohesive failure. The physical and chemical properties of aluminum alloy surface were analyzed by means of SEMS-XPS and Fourier transform infrared spectroscopy. The results showed that the plasma did not change the physical morphology of aluminum alloy surface when the treatment distance was longer. The main modification effect is surface cleaning. When the surface of aluminum alloy is close, rough oxidation layer with complex microstructure is produced by melting at high temperature, and polar functional groups such as hydroxyl groups are adsorbed on the surface of oxidation layer. The surface free energy and adhesive strength are improved significantly.
【作者单位】：同济大学机械与能源工程学院;同济大学上海市地面交通工具空气动力与热环境模拟重点实验室;陶氏化学(中国)投资有限公司;
【基金】：国家自然科学基金(51575397)~~
【分类号】：TG49

【相似文献】