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在硼硫酸氧化溶液(45g/L硫酸、8g/L硼酸)中分别添加体积分数为10%,20%,30%的硅溶胶,以15V的外加电压对LY12CZ铝合金试样进行阳极氧化实验。对氧化过程进行电流(电压)-时间曲线测试实验,对获得的氧化膜进行场发射扫描电子显微镜观察、耐点滴腐蚀实验、中性盐雾腐蚀实验、电化学交流阻抗测试,研究了不同含量硅溶胶对铝合金硼硫酸氧化膜层氧化过程、微观结构以及耐蚀性的影响。研究结果表明:不同含量的硅溶胶在硼硫酸溶液中能够影响铝合金阳极氧化膜层的生成以及溶解过程,提高所生成膜层的致密性以及平整性,进而提高了氧化膜层的耐蚀性能。

Aluminum alloy anodizing coatings were prepared for LY12CZ in the boric-sulfuric acid solution (45g/L sulfuric acid, 8g/L boric acid) with the addition of 10%, 20%, 30% (volume fraction)silica sol, with the gradient voltage of 15V. The current and voltage transients of the anodizing process were collected by data collection instrument. The surface morphologies, microstructure and chemical composition of the anodic coatings were characterized by scanning electron microscopy (SEM). The corrosion resistance was examined by neutral salt spray, electrochemical impedance spectroscopy (EIS) test and titrating test. The results show that the different concentration of silica sol addition can influence the forming and dissolution of anodizing coatings, improve the compactness smoothness and corrosion resistance during the anodizing process in the boric-sulfuric acid solution.

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