As a new-generation of concerned biomedical metal implants, magnesium (Mg) alloy has the degradability, biocompatibility and mechanical properties close to human bones that inert metals do not have. However, the side effects caused by rapid degradation become the biggest obstacle restricting its practical application. Here, we report that the preparation of polypyrrole/calcium phosphate (PPy/CaP) composite coating on Mg alloy by the application of the cathode deposition twice in a row, which delayed the corrosion of Mg alloy and reduced its corrosion current density, the biocompatibility was also greatly improved. This method is simple to operate, and could get a tightly bonded PPy coating on active metals without passivation treatments. It also avoids the substrate exposure due to the high solubility of the single electrodeposited calcium phosphate coating, and finds the future direction for application of electrodeposited modified Mg alloy.

中文翻译：

---

阴极沉积聚吡咯/二水磷酸氢钙复合涂层提高镁植入物的耐腐蚀性和生物相容性

作为新一代备受关注的生物医学金属植入物，镁（Mg）合金具有惰性金属所不具备的可降解性、生物相容性和接近人体骨骼的力学性能。然而，快速降解带来的副作用成为限制其实际应用的最大障碍。在此，我们报道了通过连续两次阴极沉积在镁合金上制备聚吡咯/磷酸钙（PPy/CaP）复合涂层，延缓了镁合金的腐蚀，降低了其腐蚀电流密度，提高了生物相容性。也得到了很大的改善。该方法操作简单，无需钝化处理即可在活性金属上获得紧密结合的PPy涂层。单一电沉积磷酸钙涂层的高溶解度避免了基体暴露，为电沉积改性镁合金的应用找到了未来方向。