Abstract Controlling degradation and improving the biocompatibility of AZ31 magnesium alloys is under continuous research for its practical biomedical applications. Here we have applied a bio-ceramic, hydroxyapatite (HAp), on AZ31 through radio frequency sputtering. The degradation analysis was investigated in SBF (simulated body fluid) for 48 days through weight loss of sample and release of Mg2+ ions by atomic absorption spectroscopy. XRD and elemental analysis confirmed the successful coating of HAp on AZ31. AZ31 was found to be hydrophilic, which became hydrophobic after sputtering. The degradation kinetics was modeled with a single exponential expression and both the weight loss and release of Mg2+ ions data of sample agreed with the same rate constant. The rate of degradation of bare AZ31 was decreased to 20% for the 9 h coated AZ31.

中文翻译：

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用于生物医学应用的生物陶瓷羟基磷灰石涂层 AZ31 镁合金的降解动力学和表面性能

摘要 控制降解和提高 AZ31 镁合金的生物相容性正在对其实际生物医学应用进行持续研究。在这里，我们通过射频溅射在 AZ31 上应用了生物陶瓷羟基磷灰石 (HAp)。通过原子吸收光谱法通过样品的重量损失和 Mg2+ 离子的释放，在 SBF（模拟体液）中研究了 48 天的降解分析。XRD 和元素分析证实了 HAp 在 AZ31 上的成功涂层。发现 AZ31 是亲水的，溅射后变成疏水的。降解动力学采用单一指数表达式建模，样品的重量损失和 Mg2+ 离子释放数据与相同的速率常数一致。对于 9 小时涂覆的 AZ31，裸 AZ31 的降解率降低到 20%。