设计并实现了一种自修复溶胶-凝胶膜层。利用膜层中添加的水滑石颗粒的阴离子交换作用实现了自修复功能，并对其修复机理进行设想和论证。长期浸泡测试结果表明，膜层中水滑石颗粒的最佳添加量为10％(质量分数)。通过 X 射线衍射和扫描电子显微镜观察验证设想。此种膜层的自修复功能是通过膜层中添加的水滑石颗粒的阴离子交换作用实现的。
In this work,hydrotalcite (HT)powder was prepared by the classical co-precipitation method using magnesium and aluminum nitrates as precursors.Different weight percentages (5%,10% and 15wt%)of hydrotalcite were added to sols.The sol-gel coatings were deposited by spin-coating method on AZ91D magnesi-um alloy substrate.Scanning electronmicroscopy (SEM)revealed the distribution of the agglomerates.The cor-rosion performance was evaluated by electrochemical impedance spectroscopy (EIS).The results showed a marked improvement of the corrosion resistance on the sol-gel/magnesium system when hydrotalcite was added to the sol-gel coating.And the healing effects may be due to the anion exchange capacity of hydrotalcite.
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