左浩越,李铭昊,闫江蓉,魏翔,唐琴,麻彦龙.5056铝箔表面新型三价铬转化膜的形成过程及影响因素[J].表面技术,2024,53(9):75-84.
ZUO Haoyue,LI Minghao,YAN Jiangrong,WEI Xiang,TANG Qin,MA Yanlong.Formation Process and Influencing Factors of a New TCP Conversion Coating on Surface of 5056 Aluminum Foil[J].Surface Technology,2024,53(9):75-84 |
| 5056铝箔表面新型三价铬转化膜的形成过程及影响因素 |
| Formation Process and Influencing Factors of a New TCP Conversion Coating on Surface of 5056 Aluminum Foil |
| 投稿时间：2024-03-26 修订日期：2024-04-10 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.09.008 |
| 中文关键词: 铝合金 铝箔 三价铬转化膜 耐腐蚀性能 |
| 英文关键词:aluminum alloy aluminum foil trivalent chromium process conversion coating corrosion resistance |
| 基金项目:重庆市自然科学基金(CSTB2022NSCQ-MSX0326);国防科技173计划(2021-JCJQ-JJ-0116);重庆英才创新创业领军人才计划(CQYC201903051);重庆市高校创新研究群体项目(CXQT20023) |
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| Author | Institution |
| ZUO Haoyue | College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China |
| LI Minghao | College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China |
| YAN Jiangrong | College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China |
| WEI Xiang | College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China |
| TANG Qin | College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China |
| MA Yanlong | College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China |
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| 中文摘要: |
| 目的 提高5056铝箔的耐腐蚀性能，探究新型三价铬转化膜的形成过程和主要影响因素。方法 在自主研发的新型三价铬转化液中对5056铝箔进行表面处理，通过改变镀膜时间、镀液pH、镀液温度来调控转化膜的结构和性能;通过重铬酸钾点滴测试、电化学测试、接触角测试、中性盐雾试验，对新型转化膜的耐腐蚀性能和表面特性进行表征;采用超薄切片辅助扫描电子显微镜、X射线光电子能谱、拉曼光谱对膜层的结构和成分进行分析。结果 在优化工艺条件下，可在5056铝箔表面获得一层厚度约为80 nm、具有较强疏水特性的化学转化膜，其主要成分为TiO2、ZrO2、Al2O3、Cr(OH)3;经过三价铬转化膜处理后，在中性盐雾试验进行1 632 h后未观察到5056铝箔试样出现明显腐蚀迹象，也未发现三价铬向六价铬的转变。结论 采用新型三价铬镀膜处理可以大幅提高5056铝箔在含NaCl环境中的耐腐蚀性能，随着镀膜时间的延长，合金表面先后经历转化膜的形核、稳定生长、开裂起皮、再生长与开裂起皮动态平衡等4个阶段，当转化膜稳定生长并完全覆盖合金表面时，其耐腐蚀性能最好。 |
| 英文摘要: |
| Aluminum foil is widely used in transportation, building and packaging industries, and is also an important raw material for making current collectors of power batteries. For such applications, surface treatment of the aluminum foil is necessary to ensure sufficient corrosion resistance. In this work, a 5056 aluminum foil was surface-treated in a newly-developed trivalent chromium process (TCP) solution. The structure and performance of the conversion coating were controlled by changing the treatment time, pH and temperature of the solution. The corrosion resistance and surface characteristics of the conversion coating under optimized conditions were characterized by potassium dichromate droplet test, electrochemical test, contact angle test, and neutral salt spray test. The structure and composition of the coating were characterized with an ultramicrotomy-assisted scanning electron microscopy and an X-ray photoelectron spectroscopy. It was found that the corrosion resistance of the new TCP conversion coating on the surface of the 5056 aluminum foil was significantly affected by the treatment time, pH and temperature of the solution. In order to obtain a uniform, continuous, and dense TCP conversion coating, the treatment time should be limited to 50-60 seconds, the pH and temperature of the solution should be maintained at 3.5-4.0 and 40-50 ℃, respectively. The thickness of the conversion coating on the 5056 aluminum foil was about 80 nm, and it was mainly composed of TiO2, ZrO2, Al2O3, and Cr (OH)3. As a result of the treatment, the surface contact angle of the aluminum foil increased from 16.7° to 106.5°, exhibiting good hydrophobic property. Compared with the bare alloy, the corrosion current density of the alloy sample with typical TCP conversion coating decreased by more than one order of magnitude in a 3.5% aqueous solution. After 1 632 hours of neutral salt spray test, no obvious signs of corrosion attack were observed on the treated alloy. Besides, no transition from trivalent chromium to hexavalent chromium was detected by Raman spectroscopy. The formation process of the TCP conversion coating includes four stages:nucleation, stable growth, cracking and peeling, and dynamic balance between re-growth and cracking/peeling. When the aluminum foil is immersed in the TCP solution, the dissolution of the natural oxide film on the alloy surface and the nucleation of the conversion coating occurs successively. It then quickly comes to the stable growth stage, and its corrosion resistance is best when the conversion coating completely covers the alloy surface. When the coating time is further extended, although the thickness or compactness of the conversion coating may increase, the tendency to crack and peel also increases, which damages the integrity of the coating and reduces its corrosion resistance. Although the conversion coating re-nucleates and re-grows at the cracked and peeled sites, its corrosion resistance is still inferior to the stage when the conversion coating just completely covers the alloy surface. |
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