Corrosion behavior and antibacterial adhesion of superhydrophobic composite coatings on AZ31 magnesium alloys

IF 2.3 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Coatings Technology and Research Pub Date : 2024-05-06 DOI:10.1007/s11998-024-00923-6

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

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Abstract

To improve the corrosion resistance and antibacterial adhesion properties of AZ31 magnesium alloy as an orthopedic implant material, superhydrophobic hydroxyapatite/lauric acid composite coatings (HA/LA) were successfully fabricated on AZ31 magnesium alloy utilizing the hydrothermal method and followed by immersion treatment in lauric acid solution. The underlying HA coating synthesized by hydrothermal technique presents a micro-/nanohierarchical structure, appearing superhydrophilic, while the composite coatings (HA/LA) obtained by subsequent treatment with lauric acid exhibited excellent superhydrophobic properties with a contact angle of 152.5 ± 1.2° and a rolling angle of 1.5 ± 0.3°. Electrochemical measurements and long-term corrosion resistance test conducted in simulated body fluid (SBF) indicate a significant enhancement in the corrosion resistance of the HA/LA composite coating. Meanwhile, in vitro bacterial experiments demonstrated that the superhydrophobic composite coating surface was able to reduce the adhesion of adherent Escherichia coli and Staphylococcus aureus by more than 98%, showing excellent antibacterial adhesion properties, indicating that the superhydrophobic HA/LA composite coating in this work grants magnesium alloy with excellent corrosion resistance and antibacterial properties.

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AZ31 镁合金上超疏水复合涂层的腐蚀行为和抗菌附着力

为了提高作为骨科植入材料的 AZ31 镁合金的耐腐蚀性和抗菌粘附性能，利用水热法在 AZ31 镁合金上成功制备了超疏水羟基磷灰石/月桂酸复合涂层（HA/LA），并随后在月桂酸溶液中进行了浸泡处理。通过水热技术合成的底层 HA 涂层呈现出微/纳米层状结构，具有超亲水性，而随后用月桂酸处理得到的复合涂层（HA/LA）则表现出优异的超疏水性能，接触角为 152.5 ± 1.2°，滚动角为 1.5 ± 0.3°。在模拟体液（SBF）中进行的电化学测量和长期耐腐蚀测试表明，HA/LA 复合涂层的耐腐蚀性能显著增强。同时，体外细菌实验表明，超疏水复合涂层表面能使粘附的大肠杆菌和金黄色葡萄球菌的粘附力降低 98% 以上，表现出优异的抗菌粘附性能，表明该研究中的超疏水 HA/LA 复合涂层赋予了镁合金优异的耐腐蚀性和抗菌性。

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来源期刊

Journal of Coatings Technology and Research 工程技术-材料科学：膜

CiteScore

4.30

自引率

8.70%

发文量

130

审稿时长

2.5 months

期刊介绍： Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.