Zhou Qi,Zong Pengde,Wang Yufeng,et al.Alumina sol prepared by resolving method to seal the pores in aluminum anodic oxide film[J].Plating & Finishing,2023,(2):1-6.[doi:10.3969/j.issn.1001-3849.2023.02.001]
回溶法氧化铝溶胶封闭铝阳极氧化膜孔
- Title:
- Alumina sol prepared by resolving method to seal the pores in aluminum anodic oxide film
- Keywords:
- alumina ; sol ; anodic oxidation ; sealing
- 分类号:
- TQ153.6
- 文献标志码:
- A
- 摘要:
- 氧化铝溶胶封闭铝合金阳极氧化膜是一种无铬、无氟且无重金属的绿色环保的封闭液。研究了回溶法氧化铝溶胶的主盐浓度、 pH 及温度对溶胶及其封闭膜性能的影响。结果表明：随着溶胶中铝离子浓度的增加，溶胶粒径显著变大，黏度升高，稳定性下降。室温下对于铝离子浓度为 0.6 mol·L -1 的氧化铝溶胶，随着溶胶的 pH 升高，溶胶黏度增大，封闭膜的耐蚀性得到加强。随着溶胶温度升高，其黏度下降，但封闭膜耐酸性溶液腐蚀的能力得到显著提高。铝阳极氧化膜溶胶封闭后，膜厚度的增加值随着溶胶黏度的升高而增大。在较佳工艺条件下溶胶封闭阳极氧化膜的点滴试液变色时间长达 63 min ，显著超过了蒸馏水和重铬酸钠封闭膜的变色时间，证实在替代重铬酸钠封闭技术方面有了重大的飞跃。
- Abstract:
- ： Aluminum alloy anodic oxidation film sealed by alumina sol is a kind of green sealing liquid ， which is free of chromium ， fluorine and heavy-metal. The influences of main salt concentration ， pH and temperature on the properties of the sol and sealed film were studied. The results show that the higher the concentration of aluminum ions in the sol lead to the larger the particle size ， the higher the viscosity and the lower the stability for the alumina sol. The viscosity of the sol increases ， then the corrosion resistance of the sealing film is enhanced when the pH of the sol increases for alumina sol with 0.6 mol·L -1 Al 3+ at room temperature. As the temperature of the sol increases ， its viscosity decreases ， but the corrosion resistance of the sealing film in acidic solution has been significantly improved. After the aluminum anodized film is sealed by sol ， the thickness of the sealing film increases with the increase of the viscosity of the sol. The discoloration time of the drop test solution is up to 63 min for the sol-sealed aluminum anodic oxide film at the optimal process conditions ， which is very longer than that of the film sealed by distilled water or sodium bichromate. That confirms a major leap forward in replacing sodium dichromate sealing technology.
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备注/Memo
收稿日期： 2020-05-15 修回日期： 2020-07-22 作者简介： 周琦（ 1970 —），女，博士，副教授，研究方向：电镀、涂装、防锈和电化学保护。 email ： 18909829862@163.com * 通信作者： 程秀莲（ 1965 —），女，硕士，教授， email ： chengxiulian001@163.com 基金项目： 辽宁省重点研发计划项目（ 2020JH2/10100011 ）?/html>