车用先进高强钢表面分析及胶接性能研究  

Surface Analysis of Advanced High Strength Steel for Vehicle and Their Bonding Performance

作　　者：邵蓉 黎敏 刘永壮 曹建平 郝玉林 蔡宁 李学涛 SHAO Rong;LI Min;LIU Yongzhuang;CAO Jianping;HAO Yulin;CAI Ning;LI Xuetao(Research Institute of Technology of Shougang Group Co.,Ltd.,Beijing 100043,China;Beijing Key Laboratory of Green Recyclable Process for Iron&steel Production Technology,Beijing 100043,China)

机构地区：[1]首钢集团有限公司技术研究院,北京100043 [2]绿色可循环钢铁流程北京市重点实验室,北京100043

出　　处：《表面技术》2024年第4期211-219,共9页Surface Technology

摘　　要：目的明确不同先进高强钢表面氧化物形貌、成分及含量对胶接性能的影响规律。方法本研究采用白光干涉仪、扫描电子显微镜(SEM)及透射电子显微镜(TEM)观察高强钢表面形貌,通过金相显微镜及X射线衍射仪(XRD)分析其显微组织及物相,采用直读光谱仪、辉光光谱仪(GDS)以及X射线光电子能谱仪(XPS)表征高强钢表面特征元素及氧化物种类。结合接触角测试对比不同高强钢表面润湿性,并分析总结高强钢表面成分对胶接性能的影响规律。结果DH780表面以膜层状Al基氧化物为主,DP980、DP1180以及CP1180表面以Si、Mn、Cr颗粒状氧化物为主。其中DH780的表面润湿性最差,自由能最小。CP1180钢表面具有最少的氧化物含量及最小的颗粒尺寸,其表面润湿性最好,表面自由能最高。DP钢随强度提高,表面氧化物含量增加,润湿性降低。对于同种焊装胶,DH780胶接剪切强度最小,CP1180剪切强度最大。结论高强钢表面氧化物富集对表面润湿性及表面自由能具有重要影响,尤其Al基氧化物的存在会明显降低胶接接头的剪切强度。一方面是氧化物导致表面自由能降低,黏附功下降,另一方面氧化物会阻止胶中极性基团与基体表面形成强化学键,而更多地形成氢键。Al基氧化物由于呈薄膜状覆盖于高强钢表面,故对胶接性能的影响最大。To investigate the effect of oxide morphology,composition and content on bonding properties of advanced high strength steels for automotive applications.In this study,a white light interferometer,a scanning electron microscope(SEM)and a transmission electron microscope(TEM)were used to observe the surface morphologies of different high-strength steels(DH780,DP980,DP1180,CP1180).The microstructure and phase structure of high-strength steels were analyzed with a metallography microscope and an X-ray diffractometer(XRD).The variation of surface characteristic elements content with depth and the types of surface oxides were analyzed with a direct reading spectrometer, a glow spectrometer (GDS) and an X-ray photoelectron spectroscopy (XPS). The surface wettability of different high strength steels was compared by the contact angle test of different systems, and the surface free energy was calculated. Finally, the bonding properties of high-strength steel and three different automobile welding adhesives were tested, and the influence of surface composition of high-strength steel on bonding properties was analyzed and summarized. The results indicated that there were oxides enrichment on the surface of high strength steels. The morphologies, types and content of oxides on the surface of different high strength steels were different. The surface of DH780 was mainly composed of membrane-layered Al based oxides, while the surface of DP980, DP1180 and CP1180 was mainly composed of Si, Mn and Cr granular oxides. The surface oxides content of DP steels increased with the increase of strength. CP1180 steel had the lowest oxide content on the surface and the smallest oxides particle size. The results of contact angle test and calculations showed that DH780 had the worst surface wettability and the lowest free energy (29.2 mn·m-1). Compared with DP1180, the wettability and surface free energy of DP980 decreased slightly with the increase of the steel strength. CP1180 showed the best surface wettability and the highest surface f

关 键 词：先进高强钢 表面成分 润湿性 胶接性能 

分 类 号：TG174[金属学及工艺—金属表面处理]