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[目的]6061铝合金在长期使用中易发生腐蚀失效。为提高其使用寿命，需开发结合力强、防护性能持久的表面防护膜层。[方法]先对6061铝合金进行阳极氧化，得到多孔阳极氧化(PAO)底层，再通过电沉积法制备了负载单宁酸(TA)缓蚀剂的铈基金属有机框架(Ce-MOF@TA)复合膜层。研究了电沉积时间、电压、1,3,5-苯三甲酸(H_3BTC)配体与金属盐物质的量比及TA质量浓度对膜层耐蚀性的影响。[结果]电沉积Ce-MOF@TA复合膜层的较优工艺参数为：H_3BTC与Ce(NO3)3·6H2O物质的量比1∶1,TA质量浓度7.5 g/L，电压15 V，时间40 min。在该条件下制备的Ce-MOF@TA膜层的腐蚀电流密度低至1.905×10-8 A/cm2，电荷转移电阻高达1.359×107Ω·cm2，经144 h中性盐雾试验后表面完好，未见点蚀。[结论]通过阳极氧化与电沉积相结合，在6061铝合金表面成功制备了Ce-MOF@TA复合膜层。该膜层结构致密，与基体结合良好，且TA缓蚀剂的引入与MOF结构产生了协同防护效应，使膜层具备优异的耐腐蚀性能，能有效延长铝合金在腐蚀环境中的服役寿命。
Abstract：[Objective] 6061 Aluminum alloy is prone to corrosion during long-term service. It is necessary to develop protective coatings with strong adhesion and durable protective performance to enhance the service life of 6061 aluminum alloy. [Method] Porous anodization(PAO) was firstly conducted on 6061 aluminum alloy surface to form a bottom layer, followed by the preparation of a cerium-based metal–organic framework(MOF) composite film loaded with tannic acid(TA) corrosion inhibitor via electrodeposition. The effects of electrodeposition time, voltage, molar ratio of 1,3,5-benzenetriacrboxylic acid(H3 BTC) ligand to metal salt, and TA mass concentration on the corrosion resistance of the Ce-MOF@TA film were studied. [Result] The process parameters for electrodepositing Ce-MOF@TA composite film were optimized as follows: molar ratio of H3 BTC to Ce(NO3)3·6H_2O of 1:1, mass concentration of TA 7.5 g/L, voltage 15 V, and electrodeposition time 40 min. Under these conditions, the prepared Ce-MOF@TA film exhibited a corrosion current density as low as 1.905 × 10-8 A/cm2 and a charge transfer resistance as high as 1.359 × 107 Ω·cm2. After 144-hour of neutral salt spray test, the film remained intact without pitting corrosion. [Conclusion] The Ce-MOF@TA composite film was successfully prepared by combining anodization with electrodeposition. The film features a compact structure, excellent adhesion to the substrate, and a synergistic protective effect arising from the incorporation of the TA corrosion inhibitor within the MOF structure. This grants the film excellent corrosion resistance, effectively extending the service life of aluminum alloy in corrosive environments.
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基本信息:
DOI：10.19289/j.1004-227x.2026.01.011
中图分类号:TG174.4
引用信息:
[1]刘涵钰,张宇,赵蕊,等.6061铝合金阳极氧化-电沉积制备Ce-MOF@TA复合膜层及其耐蚀性[J].电镀与涂饰,2026,45(01):86-93.DOI:10.19289/j.1004-227x.2026.01.011.
基金信息:
广西自然科学基金(2025JJA160085)