微孔、介孔和大孔氧化铝膜的制备及其缓蚀剂担载性能的研究

Preparation of microporous, mesoporous and macroporous alumina films and their corrosion inhibitor loading performance

以高纯铝为基体,用 2 次阳极恒直流阳极氧化的方法在磷酸-草酸混酸体系中制备出大孔氧化铝薄膜;以大孔氧化铝薄膜为基体,用中性弱阳离子溶液为介质在电化学工作站在 3 电极体系中氧化出介孔氧化铝薄膜;再在硫酸环境下用恒电压阳极氧化法制备出微孔薄膜。通过对 3 种不同孔径的氧化铝薄膜的形貌及成分进行表征,运用拉曼光谱比较三种不同孔径氧化铝薄膜对不同浓度硅烷缓蚀剂的吸附担载能力,以及电化学测试检验其担载不同浓度硅烷缓蚀剂后耐腐蚀能力,得出具有最强耐蚀能力时的氧化铝膜的最佳孔径和此时担载硅烷缓蚀剂的最佳浓度,电化学测试结果表明介孔薄膜的电化学阻抗可达 107。

Macroporous alumina films were prepared by double anodic oxidation with constant direct current in phosphoric acid-oxalic acid solution using pure aluminum. The film was further oxidized using neutral weak cation solution in a three-electrode system to prepare mesoporous alumina films, which were then treated by constant voltage anodization in sulfuric acid solution to prepare microporous films. The morphology and composition of the alumina films were characterized, and the silane corrosion inhibitor adsorption and loading performance of the alumina films were studied with Raman spectroscopy. The corrosion resistance of these films with silane corrosion inhibitors was tested by electrochemical measurements and the optimum pore size and silane corrosion inhibitor concentration were obtained. The results of electrochemical measurements show that the electrochemical impedance of the mesoporous films can reach up to 107.