The deposition of bioactive hydroxyapatite (HAp) coatings on pure magnesium (Mg) surfaces was studied. A modification of the biomimetic deposition method was used, which consisted in the incorporation of a supersaturated calcification solution (SCS). Different preparation parameters were modulated to obtain HAp and/or doped apatite coatings with different characteristics. The influence of the surface pre-treatments and soaking time in SCS on the physicochemical properties and the corrosion performance of the biomimetic HAp coatings were evaluated. Two different pre-treatments were explored to condition the sample’s surface for the biomimetic HAp deposition. After the surface pre-treatments, the Mg samples were covered with HAp coatings by soaking in SCS during two immersion periods specifically chosen for this study: 2 h and 6 h, respectively. Scanning electron microscopy, coupled with energy-dispersive X-ray spectroscopy (SEM/EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Raman Spectroscopy, and Fourier transform infrared (FTIR), were applied for the chemical, morphological, and structural characterization of the resulting biomimetic HAp-coatings. The in vitro corrosion behavior was studied by open circuit potential (OCP) measurements and electrochemical impedance spectroscopy (EIS) during immersion tests in Ringer’s physiological solution for up to 14 days. The results showed that HAp coatings were successfully deposited on the pure Mg substrates. Furthermore, the corrosion studies in Ringer’s solution showed that HAp coating behavior depends not only on the pre-treatment type but also on the immersion time in SCS. These results open the door to propose different strategies to control—on demand—the corrosion rate of Mg coated with biomimetic HAp. These systems could be a promising alternative for designing and developing new temporary implants for the human body.

研究了生物活性羟基磷灰石 (HAp) 涂层在纯镁 (Mg) 表面的沉积。使用了对仿生沉积方法的改进，包括加入过饱和钙化溶液 (SCS)。调节不同的制备参数以获得具有不同特性的HAp和/或掺杂磷灰石涂层。评估了表面预处理和 SCS 中的浸泡时间对仿生 HAp 涂层的理化性能和腐蚀性能的影响。探索了两种不同的预处理以调节样品表面以进行仿生 HAp 沉积。表面预处理后，通过在本研究中专门选择的两个浸泡时间段内浸泡在 SCS 中，镁样品覆盖有 HAp 涂层：分别为 2 小时和 6 小时。扫描电子显微镜，结合能量色散 X 射线光谱 (SEM/EDS)、X 射线光电子能谱 (XPS)、X 射线衍射 (XRD)、拉曼光谱和傅里叶变换红外 (FTIR)，应用于所得仿生HAp涂层的化学、形态和结构特征。在长达 14 天的林格生理溶液中浸泡测试期间，通过开路电位 (OCP) 测量和电化学阻抗谱 (EIS) 研究了体外腐蚀行为。结果表明，HAp 涂层成功地沉积在纯镁基体上。此外，林格溶液中的腐蚀研究表明，HAp 涂层行为不仅取决于预处理类型，还取决于在 SCS 中的浸泡时间。这些结果为提出不同的策略来控制（按需）涂有仿生 HAp 的镁的腐蚀速率打开了大门。这些系统可能是设计和开发新的人体临时植入物的有前途的替代方案。