The application prospect of biodegradable materials is being studied extensively. However, the high corrosion rate and its alloys in body fluids have been major limitations of the application of pure Mg (magnesium). To improve corrosion resistance of biodegradable AZ31 Mg alloy, we adopted microarc fluorination within a voltage range of 100-300 V in 46% hydrofluoric acid. To obtain morphologies, chemical compositions, and structural characteristics, field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) were performed, respectively. Results showed that the coating was mainly composed of MgF2. Electrochemical corrosion and immersion tests proved that the corrosion resistance of MAF-treated AZ31 Mg alloy was significantly improved compared with untreated AZ31 Mg alloy in HBSS (Hank's Balanced Salt Solution). Current densities of AZ31, MAF100, MAF150, MAF200, MAF250, and MAF300 were 342.4, 0.295, 0.228, 0.177, 0.199, and 0.212 μA/cm2, respectively. The roughness test indicated that samples under MAF treatment of 200 V, 250 V, and 300 V had large surface roughness. Meanwhile, the contact angle measurement and surface free energy test suggested that those samples had smaller contact angle and higher SFE than Ti. Thus, MAF-treated AZ31 Mg alloy might have promising application in various fields.

中文翻译：

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生物医用AZ31镁合金微弧氟化处理的表面表征及耐腐蚀性能

生物降解材料的应用前景正在被广泛研究。然而，体液中的高腐蚀速率及其合金一直是纯Mg（镁）应用的主要限制。为了提高可生物降解 AZ31 镁合金的耐腐蚀性能，我们在 46% 的氢氟酸中采用了 100-300 V 电压范围内的微弧氟化。为了获得形态、化学成分和结构特征，分别进行了场发射扫描电子显微镜 (FE-SEM)、能量色散 X 射线光谱 (EDS) 和 X 射线衍射 (XRD)。结果表明涂层主要由MgF2组成。电化学腐蚀和浸泡试验证明，在HBSS（汉克平衡盐溶液）中，MAF处理的AZ31镁合金的耐腐蚀性能比未经处理的AZ31镁合金显着提高。AZ31、MAF100、MAF150、MAF200、MAF250和MAF300的电流密度分别为342.4、0.295、0.228、0.177、0.199和0.212 μA/cm2。粗糙度测试表明，在200 V、250 V和300 V MAF处理下的样品具有较大的表面粗糙度。同时，接触角测量和表面自由能测试表明这些样品具有比 Ti 更小的接触角和更高的 SFE。因此，MAF 处理的 AZ31 Mg 合金可能在各个领域具有广阔的应用前景。和 0.212 μA/cm2，分别。粗糙度测试表明，在200 V、250 V和300 V MAF处理下的样品具有较大的表面粗糙度。同时，接触角测量和表面自由能测试表明这些样品具有比 Ti 更小的接触角和更高的 SFE。因此，MAF 处理的 AZ31 Mg 合金可能在各个领域具有广阔的应用前景。和 0.212 μA/cm2，分别。粗糙度测试表明，在200 V、250 V和300 V MAF处理下的样品具有较大的表面粗糙度。同时，接触角测量和表面自由能测试表明这些样品具有比 Ti 更小的接触角和更高的 SFE。因此，MAF 处理的 AZ31 Mg 合金可能在各个领域具有广阔的应用前景。