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

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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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Acknowledgements

The authors express their sincere gratitude to the National Natural Science Foundation of China (Grant Nos. 52271246 and 82272533) and the Shanghai Sailing Program (Grant No. 21YF1458200) or providing financial support.

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Authors and Affiliations

  1. Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China

    Hang Zhang, Shu Cai, Huanlin Zhang, Lei Ling, You Zuo, Hao Tian & Tengfei Meng

  2. Department of Orthopedic Surgery, Spine Center, Changzheng Hospital, Naval Medical University, Shanghai, 200003, China

    Guohua Xu, Xiaogang Bao & Mintao Xue

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  1. Hang Zhang
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  2. Shu Cai
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  3. Huanlin Zhang
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  4. Lei Ling
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  5. You Zuo
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  6. Hao Tian
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  7. Tengfei Meng
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  8. Guohua Xu
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  9. Xiaogang Bao
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Correspondence to Shu Cai or Guohua Xu.

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Declaration of competing interests The authors declare that they have no relevant financial or non-financial interests to disclose, no competing interests to declare that are relevant to the content of this article, no affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript, and no financial or proprietary interests in any material discussed in this article.

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

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Zhang, H., Cai, S., Zhang, H. et al. Hydroxyapatite/palmitic acid superhydrophobic composite coating on AZ31 magnesium alloy with both corrosion resistance and bacterial inhibition. Front. Mater. Sci. 18, 240678 (2024). https://doi.org/10.1007/s11706-024-0678-8

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