首页|碳酸锂溶液封闭处理对阳极氧化AA2099-T83合金耐蚀性能的影响

碳酸锂溶液封闭处理对阳极氧化AA2099-T83合金耐蚀性能的影响

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为开发一种新型铝锂合金表面处理技术,将经酒石酸-硫酸阳极氧化后的AA2099-T83合金浸泡在不同温度-浓度组合的碳酸锂(Li2CO3)溶液中进行后处理.结果表明:经过Li2CO3溶液处理后,阳极氧化合金的耐蚀性能显著提高(耐中性盐雾试验长达1300 h).此外,高温/低浓度和低温/高浓度组合的封孔过程明显不同,在高温模式下阳极氧化膜仅部分封孔,而在低温模式下阳极氧化膜的封孔更加完全.封孔处理合金的高耐腐蚀性主要归因于在阳极氧化膜表面和内部形成的封孔产物(即Li-Al-LDH和/或勃姆石)对腐蚀介质的阻隔作用.
Effect of lithium carbonate solution sealing treatment on corrosion resistance of anodized AA2099-T83 alloy
In order to develop a new surface treatment technology for aluminum-lithium alloys,an AA2099-T83 alloy was anodized in a tartaric-sulfuric acid bath and then post-treated in lithium carbonate(Li2CO3)solutions of different temperature-concentration combinations.The results show that the post-treatment in Li2CO3 solutions can greatly improve corrosion resistance of the anodized alloy(withstanding up to 1300 h of neutral salt spray test).It is found that the sealing process is distinctly different for high-temperature/low-concentration and low-temperature/high-concentration combinations.Specifically,the anodic film is only partially sealed in high-temperature mode but more fully sealed in low-temperature mode.The mechanism for the high corrosion resistance of the treated alloy is ascribed to the barrier effect of the sealing products(i.e.,Li-Al-LDH and/or boehmite)on the surface and in the interiors of the anodic film.

aluminum-lithium alloyanodizingcorrosion resistancelithium carbonateLi-Al-LDHsealing treatment

朱彭舟、麻彦龙、黄伟九、邹梦婷、杨炳元、廖益、梁钊源

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重庆理工大学材料科学与工程学院,重庆 400054

重庆大学材料科学与工程学院,重庆 400044

重庆第二师范学院经济与工商管理学院,重庆 400067

中科(广东)炼油石化有限公司,湛江 524076

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铝锂合金 阳极氧化 耐蚀性能 碳酸锂 锂-铝层状双氢氧化物 封闭处理

Chongqing Talent Plan:Leading Talents in Innovation and Entrepreneurship,ChinaUniversity Innovation Research Group of Chongqing,ChinaChongqing Natural Science Foundation,ChinaNational Natural Science Foundation of ChinaBasic Research and Frontier Exploration Project of Chongqing Science and Technology Commission,China

CQYC201903051CXQT20023CSTB2022NSCQ-MSX032651871038cstc2021ycjhbgzxm0173

2024

10.1016/S1003-6326(24)66507-6

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(6)
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