Hydroxyapatite coating of bioabsorbable magnesium alloys with a chemical solution deposition

为了控制镁合金表面的腐蚀并提高其生物相容性，采用化学溶液沉积法制备了可吸收镁合金磷酸钙涂层。羟基磷灰石（HAp）和磷酸八钙（OCP）涂层的形成取决于处理溶液的pH值。HAp和OCP涂层能够抑制镁合金在介质中的腐蚀1年。羟基磷灰石涂层镁合金的腐蚀速率比有机磷涂层镁合金的腐蚀速率小。HAp涂层在静态拉伸应力下显示出对基底的良好粘附性，这给出了轻微的塑性变形。

A novel chemical solution deposition method was developed for calcium phosphate coating of bioabsorbable Mg/Mg alloys, to control the corrosion and to improve the biocompatibility. Hydroxyapatite (HAp) and octacalcium phosphate (OCP) coatings were formed depending on the pH of treatment solution. HAp and OCP coatings were able to suppress the corrosion of Mg alloy in a medium for 1 year. The HAp-coated Mg alloys showed smaller corrosion rate than the OCP-coated alloy. The HAp coating showed good adhesiveness to the substrate under static tensile stress which gives a slight plastic deformation.