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利用微弧氧化技术在AZ91D镁合金表面原位生成含有钙、磷元素的陶瓷膜层。用SEM、XRD、EDS等研究陶瓷膜微观形貌、相组成及元素含量,利用Tafel和EIS技术来评价陶瓷膜的腐蚀性能。结果表明,所制备的陶瓷膜层成功地引入了钙和磷元素,陶瓷膜层主要由Mg2SiO4和MgO相组成。增加钙盐浓度,可以使膜层内的钙元素含量增多,微孔增加并且出现了微裂纹。电化学测试表明陶瓷膜使得镁合金在0.9%NaCl生理盐水中的耐蚀性提高了1～2个数量级,当钙盐浓度为0.3g/L时,陶瓷膜层的耐蚀性最好。
Micro-arc oxidation technology is used to generate the ceramic film containing calcium and phosphorus elements in situ on the surface of AZ91D magnesium alloy. The morphology, phase composition and elemental content of ceramic films were investigated by SEM, XRD and EDS. The corrosion resistance of ceramic films was evaluated by Tafel and EIS techniques. The results show that the prepared ceramic coating successfully introduced calcium and phosphorus, and the ceramic coating mainly consisted of Mg2SiO4 and MgO phases. Increasing the concentration of calcium salt can increase the content of calcium in the film, increase the micropores and microcracks. The electrochemical tests showed that the corrosion resistance of magnesium alloy in NaCl 0.9% NaCl solution increased by 1 ~ 2 orders of magnitude. When the concentration of calcium salt was 0.3 g / L, the corrosion resistance of ceramic coating was the best.