一种镁合金碳酸钙转化膜及其制备方法
By controlling the pH value and the synergistic effect of high concentration of calcium ions, a dense calcium carbonate conversion film is formed on the surface of magnesium alloy, which solves the problem of poor density of calcium carbonate conversion film on the surface of magnesium alloy in the prior art, and realizes a magnesium alloy surface treatment with high corrosion resistance and low energy consumption.
CN122147303BActive Publication Date: 2026-07-17TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY +2
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
- Filing Date
- 2026-05-09
- Publication Date
- 2026-07-17
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Figure CN122147303B_ABST
Abstract
本发明属于金属表面处理技术领域，具体涉及一种镁合金碳酸钙转化膜及其制备方法，该方法包括：配制碳酸氢钠溶液；向碳酸氢钠溶液中通入二氧化碳气体并在pH计监测下调节得到前驱液，且在停止通入二氧化碳气体之前，使前驱液的pH值达到5.8～7.0并保持稳定；向前驱液中以滴加的方式引入钙盐溶液以形成转换液，将镁合金试样浸入转换液中，得到表面含有碳酸钙转化膜的镁合金。此外，本发明还用上述制备方法制备了一种镁合金碳酸钙转化膜。本发明控制前驱液的pH值近似7.0，再引入高浓度钙离子，能显著改善碳酸钙晶体的成核与生长行为，以获得晶粒更细小、结构更致密、结合力更强的碳酸钙转化膜，可显著提升镁合金的耐腐蚀性能。
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