Hydroxyapatite coating of bioabsorbable magnesium alloys with a chemical solution deposition

为控制腐蚀，提高生物可吸收镁合金的生物相容性，开发了一种新型的化学溶液沉积方法制备生物可吸收镁合金的磷酸钙涂层。羟基磷灰石(HAP)和磷酸八钙(OCP)涂层的形成依赖于处理液的pH。HAP和OCP涂层对镁合金在介质中的腐蚀有1年的缓蚀作用。与OCP涂层相比，HAP涂层的镁合金具有更小的腐蚀速率。在静态拉应力作用下，HAP涂层与基材具有良好的结合力，产生轻微的塑性变形。

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.