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用化学方法在AZ91镁合金表面沉积二水磷酸氢钙涂层以提高镁合金在模拟体液中的生物降解能力。运用扫描电镜、X射线衍射对该涂层在模拟体液中浸泡前、后的显微组织进行分析。结果表明,在预钙化过程中形成的二水磷酸氢钙涂层呈现出两种不同的形貌。预钙化过程中钙化溶液的滴定速度强烈地影响预钙化涂层的形貌。随着钙化涂层在模拟体液中浸泡时间的延长,二水磷酸氢钙的衍射峰逐渐消失,羟基磷灰石在基底表面析出,表明二水磷酸氢钙在浸泡过程中发生溶解。详细讨论了二水磷酸氢钙涂层的结构以及羟基磷灰石涂层的形成机制。
The chemical method was used to deposit the coating of dicalcium phosphate dibasic on the surface of AZ91 magnesium alloy to improve the biodegradability of magnesium alloy in simulated body fluid. The microstructure of the coating before and after soaking in simulated body fluid was analyzed by scanning electron microscopy and X-ray diffraction. The results show that the two DCP coatings formed during the pre-calcification show two different morphologies. The titration rate of the calcification solution during pre-calcification strongly affects the morphology of the pre-calcified coating. With the calcification coating immersed in the simulated body fluid for an extended period of time, the diffraction peak of the dicalcium phosphate dibasic disappeared and the hydroxyapatite precipitated on the substrate surface, indicating that the dihydrogen phosphate dibasic dissolves during soaking. The structure of calcium hydrogen phosphate dibasic coating and the formation mechanism of hydroxyapatite coating are discussed in detail.