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2μm;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750h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Cr^(3+)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。
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 2μm. 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 Cr^3＋ 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.
出处
《腐蚀与防护》
CAS
北大核心
2011年第2期131-133,共3页
Corrosion & Protection
关键词
铝合金
铬酸阳极氧化
腐蚀
工艺
aluminum alloy
chromic acid anodiziing （CAA）
eorrosion
process
