DP980表面氧化物对胶接性能的影响

目的 明确高强钢DP980表面氧化物的组成及含量对胶接性能的影响规律，从而改善双相高强钢的胶接性能。方法 通过采用1%(质量分数)的醋酸溶液对双相高强钢DP980表面进行不同时间的酸蚀处理，结合扫描电子显微镜(SEM)、透射电子显微镜(TEM)对高强钢表面氧化物的微观形貌进行观察，通过电子探针(EPMA)表征酸洗前后高强钢表面元素分布变化，采用辉光放电发射光谱仪(GDS)对不同酸洗时间处理的高强钢表面元素的含量随深度变化进行分析，同时通过对Si、Mn元素的高分辨X射线光电子能谱(XPS)分峰拟合，表征高强钢表面不同氧化物成分。通过接触角测试分析酸洗处理对高强钢表面润湿性的影响。最后对不同酸洗时间处理的高强钢进行了胶接试验，探究高强钢表面氧化物含量、形貌及种类对胶接性能的影响规律。结果 DP980表面存在Si、Mn、O元素的富集，其中氧化物以SiO_x、Mn₂SiO₄、MnSiO₃、MnO等形式存在。随着酸洗时间的延长，DP980表面氧化物尤其是Si Ox含量显著降低，颗粒尺寸明显减小，同时表面纳米尺度...

Effect of Surface Oxides on Bonding Properties of DP980

The purpose of this study was to investigate the effect of composition and content of surface oxides of high strength steel DP980 on bonding properties, so as to improve the bonding properties of dual-phase high strength steel. In this paper, 1wt.% acetic acid solution was used to etch the surface of high strength dual phase steels DP980 at different times. Scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to observe the microstructures of oxides on the surface of high strength steel. Electro-Probe Microanalyzer (EPMA) were used to identify the elements distribution of DP980 before and after acid pickling. Glow discharge spectroscopy (GDS) were used to explore the variation of surface elements content with depth of DP980 treated with different pickling times. The XPS sputtering results further confirmed this conclusion. According to the peak fitting results of the high resolution X-ray photoelectron spectroscopy (XPS) spectra for Si and Mn elements, different kinds of surface oxides for high strength steel DP980 were characterized. In addition, the influence of pickling treatment on surface wettability of high strength steel was also analyzed by contact angle test. Finally, the bonding experiments of high strength steel treated with different pickling time were carried out to explore the influence of the content, morphologies and types of surface oxides on bonding properties of high strength steel surface.