Coating treatment plays an irreplaceable role in propelling the clinical application of magnesium alloys. This experiment was designed in order to observe the anticorrosion behavior of magnesium fluoride coating in rats. The MgF₂ layer was prepared on the surface of AZ31 magnesium alloy in saturated NH₄HF₂ solution by microarc fluorination (MAF) at 190 V. The cross-sectional SEM, EDS, and XRD analysis indicated that the alloy surface was covered with MgF₂. Meanwhile, SEM observation was used to compare the magnesium alloy samples before and after treatment, and it was found that the samples after coating were flatter and smoother. Two sets of experiments were carried out with the subjects, 6-week-old male rats. So that the untreated AZ31 samples and the microarc fluorinated AZ31 samples could be buried under the muscle layer individually. The volume changes and surface morphology of the corroded samples were monitored dynamically using micro-CT over a 16-week period in vivo. Comparison of results between the two sets of samples presented that the corrosion of the microarc fluoridated samples was much slower than that of the untreated ones. The MAF coating was shown to be effective in controlling the corrosion rate and progression of the magnesium alloy.

中文翻译：

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MAF处理可生物降解镁合金的体内腐蚀行为

涂层处理对推动镁合金的临床应用具有不可替代的作用。本实验旨在观察氟化镁涂层在大鼠体内的防腐性能。在饱和NH ₄ HF ₂溶液中通过微弧氟化（MAF）在190 V下在AZ31镁合金表面制备MgF ₂层。截面SEM、EDS和XRD分析表明合金表面被MgF覆盖₂. 同时，通过SEM观察对处理前后的镁合金样品进行对比，发现涂层后的样品更平整、更光滑。对受试者（6 周龄雄性大鼠）进行了两组实验。这样未经处理的 AZ31 样品和微弧氟化 AZ31 样品可以单独埋在肌肉层下。使用微型 CT在体内16 周内动态监测腐蚀样品的体积变化和表面形态。两组样品的结果比较表明，微弧氟化样品的腐蚀比未经处理的样品慢得多。MAF 涂层被证明可有效控制镁合金的腐蚀速率和进展。