李军伟,衣守志,冯瑞沁,闫婷婷,艾青.热镀锌板三价铬钝化剂的制备及其钝化膜耐蚀性能[J].表面技术,2014,43(2):109-113,133.
LI Jun-wei,YI Shou-zhi,FENG Rui-qin,YAN Ting-ting,AI Qing.Preparation and Corrosion Resistance of Trivalent Chromium Passivation Agent on Hot Dipped Galvanized Steel[J].Surface Technology,2014,43(2):109-113,133 |
| 热镀锌板三价铬钝化剂的制备及其钝化膜耐蚀性能 |
| Preparation and Corrosion Resistance of Trivalent Chromium Passivation Agent on Hot Dipped Galvanized Steel |
| 投稿时间：2013-10-17 修订日期：2013-12-26 |
| DOI： |
| 中文关键词: 热镀锌板 三价铬钝化 硅溶胶 耐蚀性 |
| 英文关键词:hot galvanized sheet trivalent chromium passivation silica sol corrosion resistance |
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| Author | Institution |
| LI Jun-wei | Tianjin University of Science & Technology,Tianjin 300457, China |
| YI Shou-zhi | Tianjin University of Science & Technology,Tianjin 300457, China |
| FENG Rui-qin | Tianjin University of Science & Technology,Tianjin 300457, China |
| YAN Ting-ting | Tianjin University of Science & Technology,Tianjin 300457, China |
| AI Qing | Tianjin University of Science & Technology,Tianjin 300457, China |
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| 中文摘要: |
| 目的 制备钝化膜耐蚀性良好的热镀锌板三价铬钝化剂。 方法 以铬酸酐、酒石酸盐、无机混酸、纳米硅溶胶为原料,制备三价铬钝化剂。 采用该钝化剂对热镀锌板进行钝化处理,通过中性盐雾试验、Tafel 极化曲线和交流阻抗谱分析钝化膜的耐蚀性能,并表征钝化膜的表面形貌和元素组成。 结果 钝化镀锌板经 120 h 中性盐雾试验后,腐蚀面积仅为 5% 。 与未钝化镀锌板相比,钝化试样的自腐蚀电位有所正移,自腐蚀电流密度降低了约 2 个数量级。 钝化膜表面较为平整,有少量白色颗粒沉积,膜中主要含有C,O,Si,Cr,Zn 等元素,且 Cr 主要以三价和六价存在,Zn 以二价存在。 结论 该三价铬钝化剂可提高镀锌板的耐蚀性能,具有较好的工业使用推广价值。 |
| 英文摘要: |
| Objective To study the preparation of trivalent chromium passivation agent and its corrosion resistance. Methods A kind of trivalent chromium passivation agent was prepared on the surface of galvanization with background film-former( a chromium anhydride) , reducing agent( tartaric acid sodium) , additive( inorganic mixed acid) and hole sealing agent( nano silica) . The corrosion resistance of the passive film was studied by neutral salt spray test ( NSS) , tafel polarization and ac impedance ( EIS) tests; and the surface morphology and elemental composition of passive film were analyzed by scanning electron microscopy ( SEM) and energy spectrum analyzer ( EDS) . Results The results showed that the corrosion area of 120 h NSS experiment was below 5% . Compared with the corrosion potential(1. 015 V) of the galvanized sheet without passivation, the self-corrosion potential ( 0. 965 V) had positive displacement,and the corrosion current density decreased by about two orders of magnitude, from 8. 458 X10-4A / cm2to 6. 356 X10-6 A / cm2. The corrosion resistance of galvanized sheet after passivation was greatly increased. SEM test showed that membrane surface was smoother with white particle deposition; EDS experiment indicated that passivated membrane mainly contained C, O, Si, Cr and Zn. XPS showed the Cr compounds were mainly trivalent and hexavalent, while the zinc compounds were mainly bivalent. Conclusion The passivation agent could improve the corrosion resistance of the galvanized sheet and has great industrial value. |
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