高耐蚀性铬酸阳极氧化工艺研究
High Anti-corrosion Chromic Acid Anodizing Process
摘 要
通过厚度、附着力、耐蚀性测试等研究了航空用铝合金的铬酸阳极氧化工艺。结果表明, 不同铝合金成分对铬酸阳极氧化膜厚度影响很大, 但各种合金的氧化膜厚均大于2 μm; 2024-T3铝合金生成的铬酸阳极氧化膜层经重铬酸钾封闭处理可通过750 h的盐雾试验, 且未封闭的氧化膜层与涂层具有优异的附着力; 铬酸阳极氧化槽液中Cr3+的浓度越低, 得到阳极氧化膜的耐腐蚀性能越好; 生成氧化膜后立即投入重铬酸钾槽液中封闭, 有助于提高膜层的耐蚀性能。本工作获得的铝合金铬酸阳极氧化工艺已在生产上得到应用。
铬酸阳极氧化
腐蚀
工艺
aluminum alloy
chromic acid anodiziing (CAA)
corrosion
process
Abstract
A chromic acid anodizing (CAA) process for aluminum alloys used in aviation was investigated by testing the thickness, adhesion and corrosion resistance of the film. The results showed that alloy components had great effect on the thickness of oxide films and all films were thicker than 2 μm. After sealing in potassium bichromate, the oxide film formed on 2024-T3 aluminum alloy met the requirements of 750 h salt spray test, and the adhesion between the oxide film without sealing and the paint layer was excellent. The lower the concentration of Cr3+ in chromic acid anodizing bath, the better the corrosion resistance of oxide film. The corrosion resistance of oxide film could be improved by sealing the oxide film immediately after formation. The chromic acid anodizing process for aluminum alloys has been applied to production.
中图分类号 TG174.45
所属栏目 应用技术
基金项目
收稿日期 2010/6/18
修改稿日期
网络出版日期
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引用该论文: WANG Li-hua,LUO Qing,YANG Yan,CHENG Hong-xia. High Anti-corrosion Chromic Acid Anodizing Process[J]. Corrosion & Protection, 2011, 32(2): 131
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参考文献
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【2】程红霞, 罗静, 尹茂生, 等. 铝合金铬酸阳极氧化膜的低铬封孔工艺研究[J]. 材料保护, 2004, 37: 32-34.
【3】Reybet Degat P,Zhou Z R,Vincent L. Effect of chromic acid anodizing treatment on fretting behaviour during fretting tests on pre-stressed specimens[J]. Thin Solid Films,1997,298:170-176.
【4】铝合金铬酸阳极氧化, SD-DQ-119, 2007[S].
【5】铝合金铬酸阳极氧化, ADET 0072, 1995[S].
【6】Snogan F,Blanc C,Mankowski G,et al. Characterisation of sealed anodic films on 7050 T74 and 2214 T6 aluminium alloys[J]. Surface and Coatings Technology,2002,154:94-103.
【7】朱祖芳. 铝合金阳极氧化与表面处理技术[M]. 北京: 化学工业出版社, 2004.
【8】崔昌军,彭乔. 铝及铝合金的阳极氧化研究综述[J]. 全面腐蚀控制, 2002, 16(6):12.
【9】赵旭辉,左禹,赵景茂,等. 几种封闭方法处理后铝阳极氧化膜的耐蚀性比较[J]. 腐蚀与防护, 2006, 27(8):400.
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