Hydroxyapatite coating of bioabsorbable magnesium alloys with a chemical solution deposition

为了控制腐蚀，提高生物可吸收镁合金的生物相容性，提出了一种新的化学溶液沉积法制备磷酸钙涂层的方法。羟基磷灰石（HAp）和八磷酸钙（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长达1年。hap涂层镁合金的腐蚀速率小于ocp涂层镁合金。在静态拉伸应力下，HAp涂层对基体具有良好的粘附性，塑性变形较小。

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.