| Investigation of Formation Process of the Chrome-free Passivation Film of Electrodeposited Zinc |
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| 作者姓名： | ZHU Li-qun YANG Fei HUANG Hui-jie |
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| 作者单位： | ZHU Li-qun，YANG Fei，HUANG Hui-jie School of Materials Science and Engineering，Beijing University of Aeronautics and Astronautics，Beijing，100083，China |
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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 mor- phologies and the elemental compositions of the treated samples with varied immersion times were observed by scanning electron mi- croscopy (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, SiO2, TiO2, Zn4Si2O7(OH)2, and SrF2. 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.
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| 关 键 词： | 电镀 锌 铬合金 薄膜 |
| 收稿时间： | 10 August 2006 |
| 修稿时间： | 2006-08-102006-12-19 |
Investigation of Formation Process of the Chrome-free Passivation Film of Electrodeposited Zinc |
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| ZHU Li-qun YANG Fei HUANG Hui-jie.Investigation of Formation Process of the Chrome-free Passivation Film of Electrodeposited Zinc[J].Chinese Journal of Aeronautics,2007,20(2):129-133. |
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| Authors: | ZHU Li-qun YANG Fei HUANG Hui-jie |
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| Institution: | School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100083, China |
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| Abstract: | 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, SiO2,TiO2, Zn4Si2O7(OH)2, and SrF2. 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. |
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| Keywords: | electrodeposited zinc chrome-free pasivation film film formation process Zinc Film Passivation Formation Process films color blue anode dissolution local pH value increase cathode hydrogen reduction process results formation show photoelectron |
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