(1. 北京科技大学 材料科学与工程学院，北京 100083；
2. 湖北新冶钢有限公司 中信特钢研究院新冶钢分院，黄石 435001)
摘 要: 为了研究浸锌工艺对铝的表面形貌以及铝/电镀镍之间结合强度的影响规律，分别对铝进行一次浸锌和二次浸锌处理，然后进行电镀操作并得到铝/电镀镍试样。通过拉伸试验测量铝/电镀镍之间的结合强度，并利用扫描电子显微镜(SEM)和能谱仪(EDS)考察铝表面、铝/电镀镍试样的截面及拉伸断面的形貌和化学成分。结果表明：铝在电镀前经一次浸锌处理后，铝/电镀镍结合强度为10.7MPa；经二次浸锌处理后，铝/电镀镍结合强度优于一次浸锌处理的，可达28.5 MPa。硅在一次浸锌层中形成夹杂物，导致铝受到镀液的腐蚀，是造成一次浸锌处理后铝/电镀镍结合强度较差的主要原因。
关键字: 浸锌层；铝；电镀镍；结合强度
（1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Xinyegang Branch of Special Steel Research Institute of China International Trust and Investment Corporation,
Hubei Xingyegang Steel Co., Ltd., Huangshi 435001, China）
Abstract:In order to investigate the effect of zinc coating process on the surface morphology of aluminium and the bonding strength of aluminium/electroplated nickel, aluminium was coated with single and secondary zinc layer before electroplating, respectively. And then, aluminium/electroplated nickel specimens were prepared. The bonding strength of aluminium/electroplated nickel was measured by tensile tests. The morphologies of aluminum surfaces, the cross sections and tensile fractures of the aluminium/electroplated nickel specimens were investigated by scanning electron microscopy (SEM), and the chemical compositions were measured by energy disperse spectroscopy (EDS). The results indicate that the bonding strength of aluminium/electroplated nickel with single zinc coated before electroplating is 10.7 MPa, while that after secondary zinc coating before electroplating is higher than that after single zinc coating, up to 28.5 MPa. It is the silicon inclusions in the single zinc coating layer that lead aluminium corroded by the electroplating solution, which is the main reason for the poor bonding strength after single zinc coating.
Key words: zinc coating; aluminium; electroplated nickel; bonding strength
