Objectives

Magnesium and magnesium alloy materials have excellent potential as biodegradable bone plate implants. However, the practical application of magnesium alloys is limited by their high chemical activity and poor corrosion resistance. Here, we chose a microarc fluorination (MAF) treatment to improve corrosion resistance while enhancing aspects of magnesium alloy properties. The aim of this study was to identify the effect of fixed-point corrosion on the corrosion resistance as well as the mechanical properties of magnesium alloys and to design a new corrosion-oriented model that can provide absolute protection over a period of time.

Material and Methods

MAF treatment is used for surface modification of magnesium alloys to improve the corrosion resistance of magnesium alloys. To investigate the effect of the coating and indentation on the corrosion resistance of Mg alloy, electrochemical corrosion experiments were carried out. It is worth mentioning that in this experiment we measured and analyzed the mechanical properties of the samples, especially the tensile strength.

Results

In the innovative indentation sample test, the coated specimens showed lower tensile strength due to the occurrence of fixed-point corrosion. To avoid the loss of mechanical properties due to fixed-point corrosion, we proposed a new idea (Corrosion-oriented Design). Ultimately, the immersion experiments as well as the mechanical properties analysis concluded that the Corrosion-oriented Design samples could maintain the mechanical properties without detectable loss for a long time.

Conclusion

The Corrosion-oriented Design model can avoid the nuisance of fixed-point corrosion and control the centralized orientation of corrosion. This provides a new direction for the clinical application of magnesium alloys, which may offer a completely stable bone-healing condition in trauma treatment and avoid the drawbacks caused by the previous uncontrolled corrosion.

中文翻译：

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新设计为可生物降解镁合金提供一定期限内的绝对保护

目标

镁和镁合金材料作为可生物降解的接骨板植入物具有极好的潜力。然而，镁合金的实际应用受到其高化学活性和较差的耐腐蚀性的限制。在这里，我们选择了微弧氟化 (MAF) 处理来提高耐腐蚀性，同时增强镁合金的各方面性能。本研究的目的是确定定点腐蚀对镁合金的耐腐蚀性和机械性能的影响，并设计一种新的腐蚀导向模型，可以在一段时间内提供绝对保护。

材料与方法

MAF处理用于镁合金的表面改性，以提高镁合金的耐蚀性。为研究镀层和压痕对镁合金耐蚀性的影响，进行了电化学腐蚀实验。值得一提的是，在本次实验中，我们对样品的力学性能，尤其是抗拉强度进行了测量和分析。

结果

在创新的压痕样品测试中，涂层样品由于发生定点腐蚀而表现出较低的抗拉强度。为了避免定点腐蚀造成的力学性能损失，我们提出了一种新的思路（Corrosion-oriented Design）。最终，浸泡实验和机械性能分析得出结论，腐蚀导向设计样品可以长时间保持机械性能而不会出现可检测到的损失。

结论

面向腐蚀的设计模型可以避免定点腐蚀的滋扰，控制腐蚀的集中方向。这为镁合金的临床应用提供了一个新的方向，可以在创伤治疗中提供一个完全稳定的骨愈合条件，避免以往腐蚀失控带来的弊端。