| FANG Qing,YANG Jing-xia,WANG Jin-jie,XU Jing-li.Research Progress of Cerium-based Passivation Methods in Metal Protection[J],50(7):119-125 |
| Research Progress of Cerium-based Passivation Methods in Metal Protection |
| Received:August 13, 2020 Revised:November 20, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.07.011 |
| KeyWord:chromate passivation cerium salt passivation passivation mechanism passivation method inorganic-organic passivation metal protection |
| Author | Institution |
| FANG Qing |
School of Chemistry and Chemical Engineering, Shanghai University of Engineering and Science, Shanghai , China |
| YANG Jing-xia |
School of Chemistry and Chemical Engineering, Shanghai University of Engineering and Science, Shanghai , China |
| WANG Jin-jie |
School of Chemistry and Chemical Engineering, Shanghai University of Engineering and Science, Shanghai , China |
| XU Jing-li |
School of Chemistry and Chemical Engineering, Shanghai University of Engineering and Science, Shanghai , China |
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| Abstract: |
| Cerium-based passivation has become one of the important methods to replace chromate passivation because of the pollution-free, low cost and good performance of cerium salt. The mechanism of cerium salt is based on blocking the cathode area of the material, thereby reducing the cathode reaction rate. This article briefly summarizes the findings of domestic and foreign researchers based on a large number of experiments, and concludes that cerium salt can form a film by itself, which has a good self-healing ability. At the same time, it is also concluded that the effect of pure cerium film is not very good, and problems such as cracks and weak adhesion are prone to appear. To address the problem, the cerium salt can be combined with other metal salts, and the obtained composite film has a better effect and slightly reduces the formation of cracks; it is also possible to add organic compounds to the cerium salt to form an organic and inorganic hybrid passivation solution. The composite passivation film has a better effect, and its anti-corrosion effect is even higher than that of chromate technology. The cerium salt and the cerium-based composite passivation film can be widely used on the surface of various metals and metal alloys, thus the application range of cerium salt passivation solution is expanded greatly, with fast increasing utilization rate in industry. The article briefly summarizes and discusses the recent progress of cerium salt passivation solution, such as the mechanism, passivation method and application fields. In order to overcome the deficiencies of the cerium salt passivation solution in the passivation mechanism and passivation methods, the latest technological methods or formula improvement methods have been refined, and in the future cerium salt passivation solute is highly possible to not only effectively solve the pollution problem caused by chromium-based passivation solution, but also improve the anti-corrosion ability of the coating. |
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