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

doi:10.1007/s11706-024-0678-8

2024, Vol. 18

Issue (1) : 240678 https://doi.org/10.1007/s11706-024-0678-8

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

Hang Zhang¹, Shu Cai¹(

), Huanlin Zhang¹, Lei Ling¹, You Zuo¹, Hao Tian¹, Tengfei Meng¹, Guohua Xu²(

), Xiaogang Bao², Mintao Xue²

¹. Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, China
². Department of Orthopedic Surgery, Spine Center, Changzheng Hospital, Naval Medical University, Shanghai 200003, China

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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.

Keywords superhydrophobic coating hydroxyapatite corrosion resistance antibacterial

Corresponding Author(s): Shu Cai,Guohua Xu

About author:

Li Liu and Yanqing Liu contributed equally to this work.

Issue Date: 22 April 2024

Cite this article:

Hang Zhang,Shu Cai,Huanlin Zhang, et al. Hydroxyapatite/palmitic acid superhydrophobic composite coating on AZ31 magnesium alloy with both corrosion resistance and bacterial inhibition[J]. Front. Mater. Sci., 2024, 18(1): 240678.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-024-0678-8
https://academic.hep.com.cn/foms/EN/Y2024/V18/I1/240678

Fig.1 XRD patterns of samples: HA (a); P0.05 (b); P0.1 (c); P0.15 (d).

Fig.2 FTIR patterns of sample HA, sample P0.1, and pure PA.

Fig.3 Contact angles and sliding angles for different samples.

Fig.4 SEM images (upper) and EDS patterns (lower) of samples: (a)(e) HA; (b)(f) P0.05; (c)(g) P0.1; (d)(h) P0.15.

Fig.5 Surface roughnesses of samples: (a) HA; (b) P0.05; (c) P0.1; (d) P0.15.

Tab.1 E_corr and i_corr values of naked Mg alloy, sample HA, and sample P0.1

Fig.6 Electrochemical test results for naked Mg alloy, HA, and P0.1 in SBF: (a) DPP curves; (b) EIS curves; (c) equivalent circuit for naked Mg alloy; (d) equivalent circuit for sample HA; (e) equivalent circuit for sample P0.1.

Tab.2 EIS spectral fitting parameters for naked Mg alloy, sample HA, and sample P0.1

Fig.7 SEM images of different samples after incubation for 4, 6, and 8 h in the E. coli bacterial solution: (a)(d)(g) naked Mg alloy; (b)(e)(h) HA; (c)(f)(i) P0.1.

Fig.8 SEM images of different samples after incubation for 4, 6, and 8 h in the S. aureus bacterial solution: (a)(d)(g) naked Mg alloy; (b)(e)(h) HA; (c)(f)(i) P0.1.

Fig.9 Fluorescence images (left) and fluorescence area percentages (right) of sample HA and sample P0.1 after incubation for 4, 6, and 8 h in different bacterial solutions: (a)(b) E. coli; (c)(d) S. aureus.

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