Liu Yanfen,Chen Zhaoyi*.Effect of sealing treatment on corrosion resistance of composite anodic oxide film on construction aluminum[J].Plating & Finishing,2025,(04):7-12.
doi: 10.3969/j.issn.1001-3849.2025.04.003封孔处理对建筑铝材复合阳极氧化膜耐蚀性的影响
- Title:
- Effect of sealing treatment on corrosion resistance of composite anodic oxide film on construction aluminum
- Keywords:
- composite anodic oxide film; construction aluminum; corrosion resistance; sealing treatment; lithium salt solution
- 分类号:
- TQ153
- 文献标志码:
- A
- 摘要:
- 以常用建筑铝材—6061铝合金作为基体，在添加PTFE乳液的电解液中制备复合阳极氧化膜，然后分别采用锆盐溶液、锂盐溶液对复合阳极氧化膜进行封孔处理，并与沸腾去离子水和镍盐溶液的封孔效果作比较。结果表明：复合阳极氧化膜在不同溶液中封孔处理后表面致密性都好于未封孔复合阳极氧化膜，耐蚀性有不同程度提高，但厚度未增加。锂盐溶液封孔后复合阳极氧化膜表面致密性良好，主要成分为Al、O、S、C、F和Li元素，其质量损失和腐蚀速率仅为28.74 mg/dm2和1.04×10?3 mm/a ，腐蚀电流密度(9.52×10?8 A/cm 2)较未封孔复合阳极氧化膜的降低幅度接近一个数量级，表现出优异耐蚀性。在锂盐溶液封孔过程中会发生反应生成水合氧化铝、氢氧化铝和氢氧化锂等物质，协同作用起到更好的双重封孔效果，有效的抑制腐蚀介质腐蚀并降低腐蚀速率，因而锂盐溶液封孔后复合阳极氧化膜的耐蚀性好于沸腾去离子水、镍盐溶液或锆盐溶液封孔后复合阳极氧化膜。
- Abstract:
- Taking common architectural aluminum material-6061 aluminum alloy as the substrate, composite anodic oxide film was prepared in the electrolyte with PTFE emulsion, and then sealed by zirconium salt and lithium salt solution respectively. The sealing effect of zirconium salt and lithium salt solution was compared with that of boiling deionized water and nickel salt solution. The results show that the surface compactness of the composite anodic oxide film after sealing treatment in different solution is better than that of unsealed counterpart, and the corrosion resistance is improved in different degrees, but the thickness is not increased. After sealing treatment in lithium salt solution, the composite anodic oxide film possesses good surface compactness and the components are mainly Al, O, S, C, F and Li elements. The mass loss and corrosion rate are only 28.74 mg/dm2 and 1.04×10 ?3 mm/a, and the corrosion current density (9.52×10 ?8 A/cm 2) is nearly an order of magnitude lower than that of unsealed composite anodic oxide film, indicating that the composite anodic oxide film after sealing treatment in lithium salt solution exhibits excellent corrosion resistance. During the sealing process in lithium salt solution, boehmite alumina, aluminum hydroxide and lithium hydroxide are generated by reactions, which can play a better double sealing effect, effectively inhibiting the corrosion of corrosive media and reduce the corrosion rate. Therefore, the corrosion resistance of the composite anodic oxide film after sealing treatment in lithium salt solution is better than that after sealing treatment in boiling deionized water, nickel salt solution or zirconium salt solution
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