Enhanced anticorrosive, antimicrobial and biocompatible properties of AZ91D magnesium alloy by MAO-polycaprolactone-modified ZnO composite coating

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS Surface & Coatings Technology Pub Date : 2024-10-30 DOI:10.1016/j.surfcoat.2024.131484

Wei He , Zijie Shao , Jianghai He , Yulin Zhang , Mengge Sun , Yaqi Jiang , Zhenguo Wen , Fei Chen

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Abstract

Magnesium alloys are biodegradable metal implant materials that are prone to corrosion in human body fluids and are poor biocompatible as a consequence. Herein, we report the preparation of a ceramic layer on an AZ91D magnesium alloy using the micro-arc oxidation (MAO) technique, after which polycaprolactone/citric-acid-monohydrate-modified nano‑zinc oxide was composited on the ceramic layer using a sol–gel method. The MAO-polycaprolactone-modified ZnO composite coating exhibited superior corrosion resistance compared to magnesium alloy, and a higher electrochemical impedance in simulated body fluid (1.0397 × 10⁷ vs. 8.444 × 10² Ω·cm²). Furthermore, data from immersion, antimicrobial, hemolysis, cell-viability, and-proliferation testing revealed that the composite coating is significantly more antimicrobial and biocompatible than the magnesium alloy. We conclude that such composite coatings have considerable potential for use in biomedical orthopedic-implant applications.

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通过 MAO-聚己内酯改性氧化锌复合涂层增强 AZ91D 镁合金的防腐、抗菌和生物相容性能

镁合金是一种可生物降解的金属植入材料，在人体体液中容易腐蚀，因此生物相容性较差。在此，我们报告了利用微弧氧化（MAO）技术在 AZ91D 镁合金上制备陶瓷层，然后利用溶胶-凝胶法在陶瓷层上合成聚己内酯/一水柠檬酸改性纳米氧化锌。与镁合金相比，MAO-聚己内酯改性氧化锌复合涂层具有更优异的耐腐蚀性，在模拟体液中的电化学阻抗更高（1.0397 × 107 vs. 8.444 × 102 Ω-cm2）。此外，浸泡、抗菌、溶血、细胞活力和增殖测试的数据显示，复合涂层的抗菌性和生物相容性明显优于镁合金。我们的结论是，这种复合涂层在生物医学骨科植入物应用中具有相当大的潜力。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.