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首页> 外文期刊>Chinese journal of aeronautics >Investigation of Formation Process of the Chrome-free Passivation Film of Electrodeposited Zinc
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Investigation of Formation Process of the Chrome-free Passivation Film of Electrodeposited Zinc

机译：电沉积锌无铬钝化膜形成过程的研究

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摘要

The feasibility was investigated to substitute chrome-free passivation treatment of electrodeposited zinc in a titanium bath for chromate passivation treatment. The formation mechanism of the chrome-free passivation film was further analyzed. The surface morphologies and the elemental compositions of the treated samples with varied immersion times were observed by scanning electron microscopy (SEM) and determined by energy dispersion spectrometry (EDS), respectively. The electrode potential of the sample surface was recorded in the film formation process. The changes of the electrode potential are in accordance with that of SEM and EDS of the sample surface. The results of X-ray photoelectron spectroscopy (XPS) show the chrome-free passivation film composed of ZnO, SiO_2, TiO_2, Zn_4Si_2O_7(OH)_2, and SrF_2. The anode zinc dissolution and the local pH value increase due to the cathode hydrogen ion reduction process result in the formation of the chrome-free passivation film. The macro-images of the chrome-free passivation films formed on electrodeposited zinc show that the color of the film changes from blue to iridescence with the increase of the immersion times.
机译：研究了替代钛浴中电沉积锌的无铬钝化处理代替铬酸盐钝化处理的可行性。进一步分析了无铬钝化膜的形成机理。通过扫描电子显微镜（SEM）观察并通过能量色散光谱法（EDS）分别测定不同时间的处理样品的表面形态和元素组成。在成膜过程中记录样品表面的电极电位。电极电位的变化与样品表面的SEM和EDS一致。 X射线光电子能谱（XPS）的结果表明，由ZnO，SiO_2，TiO_2，Zn_4Si_2O_7（OH）_2和SrF_2组成的无铬钝化膜。由于阴极氢离子还原过程而导致的阳极锌溶解和局部pH值增加，导致形成了无铬钝化膜。电沉积锌上形成的无铬钝化膜的宏观图像显示，随着浸入时间的增加，膜的颜色从蓝色变为虹彩。

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