Achieving a strong polypropylene/aluminum alloy friction spot joint via a surface laser processing pretreatment
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第15期
论文作者：S.C.Han L.H.Wu C.Y.Jiang N.Li C.L.Jia P.Xue H.Zhang H.B.Zhao D.R.Ni D.R.Ni Z.Y.Ma
文章页码：103 - 114
摘 要：Strong metal/non-polar plastic dissimilar joints are highly demanded for the lightweight design in many fields,which,however,are rather challenging to achieve directly via welding.In this study,we designed a laser processing pretreatment on the Al alloy to create a deep porous Al surface structure,which was successfully joined to the polypropylene（PP） via friction spot welding.A maximum joint strength of29 MPa was achieved,the same as that of the base PP（i.e.the joint efficiency reached 100%）,much larger than ever reported.The joining mechanism of the Al alloy and the PP was mainly attributed to the large mechanical interlocking effect between the laser processed Al porous structure and the re-solidified PP and the formation of chemical bond at the interface.The deep porous Al surface structure modified by laser processing largely changed the Al-PP reaction feature.The evidence of the C-O-Al chemical bond was first time found at the non-polar plastic/Al joint interface,which was the reaction result between the oxide on the Al alloy surface and thermal oxidization products of the PP during welding.This study provides a new way for enhancing metal-plastic joints via surface laser treatment techniques.
S.C.Han1,2，L.H.Wu1，C.Y.Jiang1，N.Li1，C.L.Jia1，P.Xue1，H.Zhang1，H.B.Zhao1，D.R.Ni1，B.L.Xiao1，Z.Y.Ma1
1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences2. Department of Materials Science and Engineering, Guilin University of Technology
摘 要：Strong metal/non-polar plastic dissimilar joints are highly demanded for the lightweight design in many fields,which,however,are rather challenging to achieve directly via welding.In this study,we designed a laser processing pretreatment on the Al alloy to create a deep porous Al surface structure,which was successfully joined to the polypropylene（PP） via friction spot welding.A maximum joint strength of29 MPa was achieved,the same as that of the base PP（i.e.the joint efficiency reached 100%）,much larger than ever reported.The joining mechanism of the Al alloy and the PP was mainly attributed to the large mechanical interlocking effect between the laser processed Al porous structure and the re-solidified PP and the formation of chemical bond at the interface.The deep porous Al surface structure modified by laser processing largely changed the Al-PP reaction feature.The evidence of the C-O-Al chemical bond was first time found at the non-polar plastic/Al joint interface,which was the reaction result between the oxide on the Al alloy surface and thermal oxidization products of the PP during welding.This study provides a new way for enhancing metal-plastic joints via surface laser treatment techniques.
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