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. 2022 Sep 14;23(18):10708.
doi: 10.3390/ijms231810708.

Study on Enhancing the Corrosion Resistance and Photo-Thermal Antibacterial Properties of the Micro-Arc Oxidation Coating Fabricated on Medical Magnesium Alloy

Tianlu Li  1 , Yun Zhao  1   2   3 , Minfang Chen  1   2   3
Affiliations

Study on Enhancing the Corrosion Resistance and Photo-Thermal Antibacterial Properties of the Micro-Arc Oxidation Coating Fabricated on Medical Magnesium Alloy

Tianlu Li et al. Int J Mol Sci. .

Abstract

Photo-thermal antibacterial properties have attracted much attention in the biomedical field because of their higher antibacterial efficiency. Through fabricating micro-arc oxidation coatings with different treating current densities set on a Mg-Zn-Ca alloy, the present study tried to systematically investigate and optimize the corrosion resistance and photo-thermal antibacterial properties of MAO coatings. The results indicated that different current densities had great influence on the corrosion resistance and photo-thermal property of the MAO coatings, and a current density at 30 A·dm-2 exhibited the best corrosion resistance, light absorption capacity at 808 nm, and photo-thermal capability, simultaneously with good antibacterial activity against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli). This photo-thermal property of MAO coatings was probably related to the effect of current density on MgO content in the coating that could promote the separation of photo-generated electron carriers and hinder the recombination of photo-generated electron carriers and holes.

Keywords: anti-bacteria; corrosion resistance; magnesium alloy; micro-arc oxidation; photo-thermal therapy.

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Conflict of interest statement

The authors declare that they have no known competing financial interests or personal relationships that could have influenced the work reported in this paper.

Figures

Figure 1
Figure 1
(a) XRD patterns of MAO coatings with different current densities; (b) histogram of Mg2SiO4/MgO wt%.
Figure 2
Figure 2
Surface morphology: (a1) P1, (b1) P2, (c1) P3, (d1) P4; and cross-sectional EDS of samples with different current densities: (a2) P1, (b2) P2, (c2) P3, (d2) P4. (Color code: yellow = P, red = Mg, violet = Si, green = O).
Figure 3
Figure 3
The thickness of MAO coating.
Figure 4
Figure 4
(a) Nyquist, (b) Bode, and (c) Bode phase angle plots and (d) equivalent circuit models of all samples.
Figure 5
Figure 5
Potentiodynamic polarization curves of the different samples tested in SBF.
Figure 6
Figure 6
(a) HE curves and (b) corrosion rate images of the samples immersed in SBF solution for 192 h.
Figure 7
Figure 7
The UV–vis spectra of P1, P2, P3, and P4.
Figure 8
Figure 8
The characterization of the photo-thermal properties of the different samples: (a) heating curves of Mg, P1, P2, P3, and P4 (1.0 W/cm2, 15 min); (b) the heating and cooling curves of the different samples for three cycles; (c) the real-time pictures taken during the light irradiation process of different samples, (*F: Fahrenheit degree).
Figure 9
Figure 9
(a) XPS high-resolution O 1 s spectra of P3 and (b) Raman spectra of P3.
Figure 10
Figure 10
Schematic illustrating the mechanism of the photocatalytic property of the MAO coating.
Figure 11
Figure 11
The antibacterial properties of samples against S. aureus.
Figure 12
Figure 12
The antibacterial properties of samples against E. coil.
Figure 13
Figure 13
MAO cross-section AFM morphology and potential diagram of P3.
Figure 14
Figure 14
The antibacterial mechanism of MAO coating under photo-thermal action.
See this image and copyright information in PMC

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