LIU Jing,MA Xiaozhao,WANG Shuaixing.Research on Chromic Acid Anodizing Technique for Insulation Protection[J].Plating & Finishing,2022,(6):41-46.[doi:10.3969/j.issn.1001-3849.2022.06.009]
绝缘保护用铬酸阳极氧化工艺研究
- Title:
- Research on Chromic Acid Anodizing Technique for Insulation Protection
- Keywords:
- aluminum alloy; ??ard anodizing; ??hromic acid anodizing; ??wo-step increasing voltage; ??ealing; ??nsulation voltage
- 分类号:
- TG 174.451
- 文献标志码:
- A
- 摘要:
- 航空上大量铝合金零件在铬酸阳极氧化后需进行局部硬质阳极氧化，现有的涂蜡 / 胶方法工艺流程长且易造成硬质阳极氧化膜白斑缺陷，有必要开发一种绝缘保护铬酸阳极氧化工艺。本文重点从槽液杂质控制、升压方式调整、封闭方法优化等角度研究了相关因素对氧化膜厚度、耐绝缘击穿性能的影响，确定了绝缘保护铬酸阳极氧化工艺并评价了其应用效果。结果表明：通过控制铬酸阳极氧化溶液中 Cl - 、 SO 4 2- 含量分别在 0.1 g/L 、 0.4 g/L 以下，采用二次升压法进行阳极氧化可获得 4~6 μ m 厚的氧化膜；同时经沸水和醋酸镍双重封闭后，氧化膜的耐绝缘击穿性能大幅提高，最小绝缘电压大于 90 V ，且可通过 800 h 的中性盐雾试验。新型绝缘保护铬酸阳极氧化工艺，大幅缩短了局部硬质阳极氧化工艺流程，且可完全消除涂蜡造成硬质阳极氧化膜层白斑及白点缺陷，应用效果显著。
- Abstract:
- ： In the aviation field ， many aluminum alloy parts need to be localized hard anodic oxidation after chromic acid anodizing （ CAA ） . At present ， overlaying wax or glue is widely used for the protection of non-hard anodic parts ， but this process is long and easy to cause the white spot defect of hard anodic film. Therefore ， it is necessary to develop an CAA technique for insulation protection. In this paper ， the control of bath impurities ， the adjustment of the boosting method ， and the optimization of the sealing method were emphatically researched ， and the influence of these factors on the thickness and insulation breakdown resistance of the oxide films was analyzed. Subsequently ， the CAA process for insulation protection was determined and its application effect was evaluated. The results showed that if the Cl - and SO 4 2- content in the anodizing solution were controlled to be below 0.1 g/L and 0.4 g/L ， and the second step-up method was used for anodizing ， an oxide film with the thickness of 4~6 μ m could be obtained. Meanwhile ， when CAA film was double-sealed with boiling water and nickel acetate ， its insulation breakdown resistance was greatly improved ， the minimum insulation voltage was above 90 V ， and it could pass the neutral salt spray test of 800 h. The new CAA technique for insulation protection greatly shortened the local hard anodizing process ， and could completely eliminate the white spots of the hard anodic film caused by coating wax ， and the application effect was remarkable.
参考文献/References:
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备注/Memo
收稿日期： 2021-01-27 修回日期： 2021-02-26 作者简介： 刘静（ 1985 —），女，硕士，高级工程师， email ： 307257849@qq.com?/html>