纳米晶工业纯铁及其Ni镀层的性能

Properties of nanocrystalline industrial pure iron and its Ni plating layer

为了探究基体材料纳米化对镀层性能的影响,采用直流电沉积方法在纳米晶工业纯铁和粗晶工业纯铁上制备了不同厚度的Ni镀层.利用扫描电子显微镜与X射线衍射仪观察并分析了镀层的组织形貌和结构.采用电化学测试和静态浸泡方法对基体和镀层进行了耐腐蚀性能研究.结果表明,纳米晶工业纯铁的基体及其Ni镀层的耐腐蚀性能略优于相同厚度下粗晶工业纯铁的基体及其Ni镀层,但随着镀层厚度的增加,这种差异逐渐减小.同时随着镀层厚度的增加,镀层表面越来越平整致密.

In order to explore the effect of nanocrystallization of matrix material on the properties of plating layer,the Ni plating layer with different thickness was prepared on the nanocrystalline industrial pure iron and coarse crystalline pure iron with the DC electrodeposition method. The morphology and microstructure of Ni plating layer were analyzed with the scanning electron microscope（ SEM） and X ray diffractometer（ XRD）. The study on the corrosion resistance of matrix and Ni plating layer was carried out with the electrochemical tests and static immersion method. The results showthat the corrosion resistance of both matrix and Ni plating layer for the nanocrystalline industrial pure iron is slightly superior to that for the coarse crystalline pure iron with the same plating thickness. However,with increasing the thickness of plating layer,the above-mentioned difference gradually reduces. At the same time,it is found that with increasing the thickness of plating layer,the surface of Ni plating layer is smoother and denser.