ABSTRACT

Magnesium (Mg) and its alloys are promising materials for a wide range of biomedical applications due to its biodegradability. Nevertheless, their rapid corrosion dictates the need to develop strategies to control these materials’ corrosion rate. In fact, several surface modification techniques have been used to retard the corrosion of Mg and its alloys. Laser technology can be used to tailor Mg surfaces aiming to modify exposed area/roughness and thus control the biocorrosion process.

This work presents a detailed study on pure Mg surface texturing by an Nd:YAG laser and their morphological characterisation, aiming to create either localised texturing or remelted areas. The characterisation of the textured and remelted surfaces was carried out by scanning electron microscopy and analysed using image analysis software (Image J) for obtaining their depth and width. Results show that higher scan speed (400 mm/s) and lower laser power (1.5 W) were unsuitable for machining pure Mg. The parameters to perform texturing and remelting are discussed herein.

摘要

镁 (Mg) 及其合金由于其可生物降解性而成为具有广泛生物医学应用前景的材料。然而，它们的快速腐蚀决定了需要制定策略来控制这些材料的腐蚀速率。事实上，已经使用了几种表面改性技术来延缓镁及其合金的腐蚀。激光技术可用于定制镁表面，旨在修改暴露面积/粗糙度，从而控制生物腐蚀过程。

这项工作通过 Nd:YAG 激光对纯镁表面纹理及其形态特征进行了详细研究，旨在创建局部纹理或重熔区域。通过扫描电子显微镜进行纹理化和重熔表面的表征，并使用图像分析软件 (Image J) 进行分析以获得它们的深度和宽度。结果表明，较高的扫描速度 (400 mm/s) 和较低的激光功率 (1.5 W) 不适合加工纯镁。本文讨论了进行织构化和重熔的参数。