界面微结构对PA6/铝合金连接性能的影响
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摘要
采用抛光或抛光-化学刻蚀对铝合金表面进行预处理,获得微纳米结构表面,再利用自制模具对铝合金与尼龙6(PA6)进行热压成型。用扫描电镜、激光共聚焦显微镜观察发现,硫酸刻蚀形成的微纳米结构表面有利于树脂在铝合金表面形成良好的机械互锁结构,实现PA6/铝合金优良的连接性能。力学性能测试显示,硫酸刻蚀后的PA6/铝合金连接试样拉伸剪切强度达到了19. 1 MPa,界面粘结性能最优,比抛光后的连接试样提高了870%,其失效模式由界面失效变为内聚失效。
Micro-nano structures on aluminum alloys surface were pretreated through polishing,and/or chemical etching. The PA6/aluminum alloy specimens were fabricated by hot pressing in the self-made mold. The surface morphologies of the samples were examined by the field emission scanning electron microscopy and the laser scanning confocal microscope. Results show that the micro-nano sized rougher surface of alloy after sulphuric acid corrosion leads to a stronger mechanical interlock structure between aluminum alloy and PA6,resulting in highly improved joint strength.The mechanical properties show that the tensile shear strength of sample after sulphuric acid etching reaches 19. 1 MPa,and the maximum interfacial joint strength of the studied sample is obtained. Compared with sample without chemical etching,the shear strength of the etched sample increases about 870%. At the same time,the failure mode is changed from adhesive type to cohesive type.
Micro-nano structures on aluminum alloys surface were pretreated through polishing,and/or chemical etching. The PA6/aluminum alloy specimens were fabricated by hot pressing in the self-made mold. The surface morphologies of the samples were examined by the field emission scanning electron microscopy and the laser scanning confocal microscope. Results show that the micro-nano sized rougher surface of alloy after sulphuric acid corrosion leads to a stronger mechanical interlock structure between aluminum alloy and PA6,resulting in highly improved joint strength.The mechanical properties show that the tensile shear strength of sample after sulphuric acid etching reaches 19. 1 MPa,and the maximum interfacial joint strength of the studied sample is obtained. Compared with sample without chemical etching,the shear strength of the etched sample increases about 870%. At the same time,the failure mode is changed from adhesive type to cohesive type.
引文
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[2]郑海彤.金属材料在汽车轻量化中的应用与发展研究[J].科技资讯,2014,12(10):56-57.
[3]蒋百威.铝合金搅拌摩擦接头的熔焊工艺研究[J].现代机械,2013,3(2):9-12.
[4]范子杰,桂良进,苏瑞意.汽车轻量化技术的研究与进展[J].汽车安全与节能学报,2014,5(1):1-16.
[5]沈慧芳,陈焕钦.聚氨酯胶黏剂在汽车上的应用及研究进展[J].化学与黏合,2005,27(4):225-229.
[6]BALDAN A.Adhesively-bonded joints and repairs in metallic alloys,polymers and composite materials:adhesives,adhesion theories and surface pretreatment[J].Journal of Materials Science,2004,39(1):1-49.
[7]NAGATSUKA K,YOSHIDA S,TSUCHIYA A,et al.Direct joining of carbon-fiber-reinforced plastic to an aluminum alloy using friction lap joining[J].Composites Part B Engineering,2015,73(3):82-88.
[8]YEH R Y,HSU R Q.Improving the adhesion of plastic/metal direct bonding by injection moulding using surface modifications[J].Advances in Materials&Processing Technologies,2016,2(1):21-30.
[9]FABRIN P A,HOIKKANEN M E,VUORINEN J E.Adhesion of thermoplastic elastomer on surface treated aluminum by injection molding[J].Polymer Engineering&Science,2007,47(8):1187-1191.
[10]WU R,LIANG S,LIU J,et al.Fabrication of the micro/nano-structure superhydrophobic surface on aluminum alloy by sulfuric acid anodizing and polypropylene coating[J].Journal of Nanoscience&Nanotechnology,2013,13(3):2362.
[11]HE P,CHEN K,YANG J.Surface modifications of Ti alloy with tunable hierarchical structures and chemistry for improved metalpolymer interface used in deepwater composite riser[J].Applied Surface Science,2015,328:614-622.
[12]ALIASGHARI S,GHORBANI M,SKELDON P,et al.Effect of plasma electrolytic oxidation on joining of AA 5052 aluminium alloy to polypropylene using friction stir spot welding[J].Surface&Coatings Technology,2017,313(8):274-281.
[13]TAKI K,NAKAMURA S,TAKAYAMA T,et al.Direct joining of a laser-ablated metal surface and polymers by precise injection molding[J].Microsystem Technologies,2016,22(1):31-38.
[14]JUNG K W,KAWAHITO Y,TAKAHASHI M,et al.Laser direct joining of carbon fiber reinforced plastic to aluminum alloy[J].Journal of Laser Applications,2013,25(3):530-533.
[15]BALDAN A.Adhesion phenomena in bonded joints[J].International Journal of Adhesion&Adhesives,2012,38(4):95-116.
[16]FOURCHE G.An overview of the basic aspects of polymer adhesion.Part II:application to surface treatments[J].Polymer Engineering&Science,2010,35(12):957-967.
[17]BALDAN A.Adhesively-bonded joints and repairs in metallic alloys,polymers and composite materials:Adhesives,adhesion theories and surface pretreatment[J].Journal of Materials Science,2004,39(1):1-49.
[18]EISLER H,REIF M,HENNING F.Investigations on the mechanical behaviour of hybrid polymer metal joints[C]//European Conference on Composite Materials,2010.