Hydroxyapatite/palmitic acid superhydrophobic composite coating on AZ31 magnesium alloy with both corrosion resistance and bacterial inhibition

IF 2.5 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Frontiers of Materials Science Pub Date : 2024-05-13 DOI:10.1007/s11706-024-0678-8

Hang Zhang, Shu Cai, Huanlin Zhang, Lei Ling, You Zuo, Hao Tian, Tengfei Meng, Guohua Xu, Xiaogang Bao, Mintao Xue

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Abstract

The coating-modified magnesium (Mg) alloys exhibit controllable corrosion resistance, but the insufficient antibacterial performance limits their clinical applications as degradable implants. Superhydrophobic coatings show excellent performance in terms of both corrosion resistance and inhibition of bacterial adhesion and growth. In this work, a hydroxyapatite (HA)/palmitic acid (PA) superhydrophobic composite coating was fabricated on the Mg alloy by the hydrothermal technique and immersion treatment. The HA/PA composite coating showed superhydrophobicity with a contact angle of 153° and a sliding angle of 2°. The coated Mg alloy exhibited excellent corrosion resistance in the simulated body fluid, with high polarization resistance (77.10 kΩ·cm²) and low corrosion current density ((0.491 ± 0.015) µA·cm⁻²). Meanwhile, the antibacterial efficiency of the composite coating was over 98% against E. coli and S. aureus in different periods. The results indicate that the construction of such superhydrophobic composite coating (HA/PA) on the Mg alloy can greatly improve the corrosion resistance of Mg alloy implants within the human body and avoid bacterial infection during the initial stages of implantation.

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兼具耐腐蚀性和抑菌性的 AZ31 镁合金羟基磷灰石/棕榈酸超疏水复合涂层

涂层改性的镁（Mg）合金具有可控的耐腐蚀性，但抗菌性能不足限制了其作为可降解植入体的临床应用。超疏水性涂层在耐腐蚀性和抑制细菌粘附和生长方面都表现出卓越的性能。在这项工作中，通过水热技术和浸泡处理，在镁合金上制作了羟基磷灰石（HA）/棕榈酸（PA）超疏水性复合涂层。HA/PA 复合涂层具有超疏水性，接触角为 153°，滑动角为 2°。涂层镁合金在模拟体液中表现出优异的耐腐蚀性能，极化电阻高（77.10 kΩ-cm2），腐蚀电流密度低（(0.491 ± 0.015) µA-cm-2）。同时，复合涂层在不同时期对大肠杆菌和金黄色葡萄球菌的抗菌效率均超过 98%。结果表明，在镁合金上构建这种超疏水复合涂层（HA/PA）可以大大提高镁合金植入体在人体内的抗腐蚀性，避免植入初期的细菌感染。

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来源期刊

Frontiers of Materials Science MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

4.20

自引率

3.70%

发文量

515

期刊介绍： Frontiers of Materials Science is a peer-reviewed international journal that publishes high quality reviews/mini-reviews, full-length research papers, and short Communications recording the latest pioneering studies on all aspects of materials science. It aims at providing a forum to promote communication and exchange between scientists in the worldwide materials science community. The subjects are seen from international and interdisciplinary perspectives covering areas including (but not limited to): Biomaterials including biomimetics and biomineralization; Nano materials; Polymers and composites; New metallic materials; Advanced ceramics; Materials modeling and computation; Frontier materials synthesis and characterization; Novel methods for materials manufacturing; Materials performance; Materials applications in energy, information and biotechnology.