Abstract The present study investigates the effect of EDTA disodium salt and Monosodium citrate treatments to improve the corrosion resistance of anodized aluminum alloys coated with sol–gel. The anticorrosive properties were studied by Electrochemical Impedance Spectroscopy (EIS) technique. The chemical and morphological characterization were carried out by Focus Ion Beam (FIB), Field Emission Scanning Microscopy (FESEM) and Fourier Transform Infrared Spectroscopy (FTIR) techniques. The results suggests that the addition of any of these salts in the sol–gel film improves the corrosion resistance of the anodized aluminum alloy. Very stable and high impedance values are obtained after a long period of immersion in 0.1 M NaCl solution. The best results are obtained with the addition of 0.5 g L−1 EDTA disodium salt and 1 g L−1 monosodium citrate. The improvement of the corrosion properties is attributed to the changes in sol–gel formation that produce a more compact protective barrier with the COO− groups, which can prevent the entry of aggressive electrolyte by repulsion of charges.

中文翻译：

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阳极氧化AA2024T3合金有机基密封的防腐性能

摘要 本研究调查了 EDTA 二钠盐和柠檬酸一钠处理对提高涂有溶胶-凝胶的阳极氧化铝的耐腐蚀性的影响。通过电化学阻抗谱（EIS）技术研究了防腐性能。通过聚焦离子束 (FIB)、场发射扫描显微镜 (FESEM) 和傅立叶变换红外光谱 (FTIR) 技术进行化学和形态表征。结果表明，在溶胶-凝胶膜中添加这些盐中的任何一种都可以提高阳极氧化铝的耐腐蚀性。在 0.1 M NaCl 溶液中长时间浸泡后，可以获得非常稳定的高阻抗值。添加 0.5 g L-1 EDTA 二钠盐和 1 g L-1 柠檬酸一钠可获得最佳结果。