Enhancing the corrosion resistance of magnesium alloys with biodegradable poly(trimethylene carbonate) chemical modification coating

IF 8.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Advances Pub Date : 2023-12-23 DOI:10.1016/j.mtadv.2023.100460

Jia Liang, Yanyan He, Rufeng Jia, Shikai Li, Lin Duan, Shijun Xu, Di Mei, Xuhui Tang, Shijie Zhu, Jianshe Wei, Tianxiao Li, Yingkun He

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Abstract

Magnesium (Mg) alloys have great potential as biodegradable materials for medical device. However, their susceptibility to corrosion poses a significant challenge for practical applications. In this study, the poly(trimethylene carbonate)-dimethacrylate (PTMC-dMA) was employed as a coating material for ZE21B magnesium alloys. Upon UV irradiation, the PTMC-dMA macromer undergoes cross-linking to form a uniform PTMC coating with a thickness of approximately 5 μm, effectively protecting the magnesium alloy. The corrosion resistance in simulated body fluid (SBF) was evaluated through immersion testing, which showed minimal hydrogen generation (0.16 mL/cm²) during the initial 24-h period and slight corrosion observed on the PTMC-coated magnesium alloy surface after continuous immersion for 21 days. The silane coupling agent significantly enhanced the adhesive performance between the polymer and alloy. Micro-scratch tests revealed adhesion forces of 3.79 N and 5.75 N for coatings without and with the silane agent, respectively. Electrochemical tests also demonstrated the efficacy of silane treatment, showing corrosion currents of 2.100 × 10⁸ A/cm² for silane-treated samples compared 6.263 × 10⁷ A/cm² for untreated ones. Given its exceptional tensile and protective properties, this coated material is ideal for intricate bioresorbable applications, like endovascular bioresorbable stents.

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用可生物降解的聚三亚甲基碳酸酯化学改性涂层增强镁合金的耐腐蚀性能

镁（Mg）合金作为可生物降解的医疗器械材料具有巨大的潜力。然而，它们的易腐蚀性给实际应用带来了巨大挑战。本研究采用聚（三亚甲基碳酸酯）-二甲基丙烯酸酯（PTMC-dMA）作为 ZE21B 镁合金的涂层材料。在紫外线照射下，PTMC-dMA 大分子发生交联，形成厚度约为 5 μm 的均匀 PTMC 涂层，有效地保护了镁合金。通过浸泡测试评估了在模拟体液（SBF）中的耐腐蚀性，结果表明在最初的 24 小时内氢气生成量极小（0.16 mL/cm2），而在连续浸泡 21 天后，PTMC 涂层镁合金表面出现了轻微腐蚀。硅烷偶联剂大大提高了聚合物与合金之间的粘合性能。显微划痕测试显示，不含硅烷偶联剂和含硅烷偶联剂的涂层附着力分别为 3.79 N 和 5.75 N。电化学测试也证明了硅烷处理的功效，经硅烷处理的样品的腐蚀电流为 2.100 × 108 A/cm2，而未经处理的样品的腐蚀电流为 6.263 × 107 A/cm2。鉴于其卓越的拉伸和保护性能，这种涂层材料非常适合用于复杂的生物可吸收应用，如血管内生物可吸收支架。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Today Advances MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

14.30

自引率

2.00%

发文量

116

审稿时长

32 days

期刊介绍： Materials Today Advances is a multi-disciplinary, open access journal that aims to connect different communities within materials science. It covers all aspects of materials science and related disciplines, including fundamental and applied research. The focus is on studies with broad impact that can cross traditional subject boundaries. The journal welcomes the submissions of articles at the forefront of materials science, advancing the field. It is part of the Materials Today family and offers authors rigorous peer review, rapid decisions, and high visibility.