为了提高工业用钢铁、铝合金等材料表面Zn层的耐蚀和装饰性，Zn表面一般进行Cr酸盐钝化处理。Zn镀层采用Cr(III)替代Cr(VI)进行钝化，是环保和健康的大势所趋。Cr(III)钝化层在实际应用中的最大问题是工艺稳定性差、致密性较低。稀土金属离子改性钝化液有益于提高Cr(VI)钝化层的耐蚀性，但稀土改性Cr(III)基钝化膜的常温成膜元素迁移机制及缓蚀离子协同作用机理影响鲜见报道。本研究是借由常温用绿色钝化液配方的选用、膜层成长过程解析及成膜后表面性能揭示，设计一种常温形成、稳定性高的稀土Ce(IV)改性的Cr(III)转化膜。拟通过开路电位-时间谱技术、EIS等原位电化学测试、XPS、XRD、SEM等表面分析和DSC、E-pH图、溶解度曲线等热稳定性分析, 阐明Zn板上绿色型Cr(III)转化膜中成膜元素界面迁移规律，解析稀土改性膜层缓蚀机理，为扩展材料绿色冶金工艺提供参考。

With the increasing demands for corrosion resistances and decoration properties of materials (e.g. steels, aluminum alloys) from industry, additional chromite conversion treatments on Zn surfaces are required. It is a general trend to replace Cr(VI) by Cr(III) for passivation of Zn plating due to the environment protection and mentally healthy issues. Newly developed non-toxic Cr(III) coating systems should offer better protection against corrosion and technological stability on Zn coating. The rare earth can be used as the auxiliary ingredient to the corrosion inhibition of the Cr(III) conversion coating, while little work of the migration regularities of film-forming elements and the synergetic effects of inhibitory ions has been done for the rare earth doped conversion coating. Discussing the element migration and interface inhibitary mechanism of the Cr (III) conversion coating is the main work of this research. It included the character analysis of the formula of the treatment solution, the operating condition of the film growth, and the performance of different type aftertreatment Cr (III) coating. They will be performed using in-situ electrochemical tests (open circuit potential-time technique, electrochemical impedance spectra (EIS), et al), ex-situ surface analysis (X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), et al), and thermalstability ( differential scanning calorimeter (DSC), E-pH diagrams, oxide solubilities, et al). By the clarify of element migration rule for the interface of coating/solution on galvanized sheets, the corrosion resistance of the rare earth modified coating would be determined, the extended environment-friendly metallurgy process and rare-earth element application would be provided.