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采用微波辅助法在AZ31镁合金表面制备了植酸镁/羟基磷灰石(PA/HA)复合涂层。利用FESEM、EDS、XRD和电化学性能测试等方法表征了涂层的表面形貌、物相组成以及耐蚀性能,探究了植酸溶液的pH值对PA/HA复合涂层形貌及耐蚀性能的影响,并通过浸泡实验研究了镁合金及PA/HA复合涂层在模拟体液(SBF)中的降解矿化行为。结果表明:在植酸预处理中植酸溶液的pH值为5.0时制备得到的PA/HA复合涂层表面均匀、无裂纹,与镁合金基底的界面结合良好;并且在此pH值下样品的交流阻抗最大,自腐蚀电流密度最小,说明其耐蚀性最好。在SBF中,PA/HA复合涂层能够快速诱导磷灰石的生成,并显著提高镁合金基底的耐蚀性能。
Magnesium phytate / hydroxyapatite (PA / HA) composite coating was prepared on AZ31 magnesium alloy by microwave assisted method. The surface morphology, phase composition and corrosion resistance of the coating were characterized by FESEM, EDS, XRD and electrochemical tests. The effect of pH value of phytic acid solution on the morphology and corrosion resistance of PA / HA composite coating The degradation and mineralization of magnesium alloy and PA / HA composite coating in simulated body fluid (SBF) were studied by immersion experiments. The results showed that the surface of PA / HA composite coating prepared by phytic acid solution pretreatment phytic acid solution at pH 5.0 was uniform and crack-free, and the interface with magnesium alloy substrate was well bonded. At this pH value, AC impedance maximum self-corrosion current density minimum, indicating the best corrosion resistance. In SBF, PA / HA composite coating can rapidly induce the formation of apatite and significantly improve the corrosion resistance of magnesium alloy substrate.