低温空气等离子体处理对铝合金表面粘接性能的影响

摘要

In order to improve the bonding strength between aluminum and polymer material,low temperature air plasma technology was used as a pre-treatment process on the surface of 5083 typed aluminum alloy for activation.The physical and chemical properties of the surface,such as micromorphology,contact angle,surface energy,element and their valence states were analyzed,and adhesive properties of bonded aluminum plates were detected.The results show that the surface activity increases significantly after low temperature plasma treated,the water contact angle on aluminum alloy decreases from 88.7°to a minimum of 10.1 °,and the surface energy increases from 19.21 mJ/m2 to 74.04 mJ/m2.The surface oxygen content increase obviously,without change of the surface micromorphology and roughness.The tensile-shear strength of the bonded plates increase with extending plasma treatment time,and the maximum value reaches 12.4 MPa,which is about 4 times of untreated specimen.The increase of surface oxygen content and the enhanced surface activity are important factors to improve the bonding property.%为了提高铝合金与高分子材料之间粘接强度,采用低温空气等离子体预处理技术,对5083型铝合金表面进行活化处理.对铝合金表面的显微形貌、接触角、表面能、化学元素的成分及价态等理化性能进行了分析,对铝合金与环氧树脂的粘接性能进行了测试.结果表明:低温等离子体处理后铝合金表面的活性显著增加,水接触角由88.7°最低降至10.1°,表面能由19.21 mJ/m2增加到74.04 mJ/m2,表面氧元素含量明显增加,显微形貌及粗糙度未发生明显改变.铝合金板粘接后的拉剪强度随处理时间增加而增加,最高值达到12.4 MPa,较处理前提高了约4倍,表面氧元素的含量及活性增加是树脂与铝合金粘接性能提升的重要因素.