Fabrication and degradation behavior of MAO-HA coating on Zn-Mg-Ag alloy

Dong H, Xu Y, Xu W, Su J, Zhuo X, Wang D, Virtanen S, Wang Y (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Surface & Coatings Technology Elsevier

Book Volume: 503

Article Number: 131959

DOI: 10.1016/j.surfcoat.2025.131959

Abstract

In this study, a bioactive coating was successfully fabricated on the surface of Zn-Ag-Mg alloy utilizing Micro-Arc Oxidation (MAO) technology. This coating effectively embedded hydroxyapatite particles (HAP) during the MAO process by incorporating them into the electrolyte solution, thereby enhancing both the corrosion resistance and osteogenesis-promoting capability of the alloy. Experimental results revealed that the coating was primarily composed of ZnO and HA, with a controlled thickness of approximately 10 μm. Compared to untreated Zn substrates and pure MAO coatings, the use of an electrolyte containing a low dosage of HAP (1 g/L) demonstrated a remarkable reduction in corrosion resistance. The corrosion current density of the substrate (4.51 × 10−5 A/cm2) was reduced by one order of magnitude via HAP (1 g/L) coating (1.06 × 10−6), while the corrosion rate of the substrate (0.532 mm/a) was reduced by more than one orders of magnitude by HAP(1 g/L) coating(0.012 mm/a). However, high concentrations of HAP were found to potentially increase the crack sensitivity of the coating, posing a threat to its structural stability. Immersion tests confirm the MAO-HAP coating's ability to enhance the Ca[sbnd]P precipitation ability of the Zn-Ag-Mg alloy, underscoring its promising potential for biomedical applications.

Authors with CRIS profile

Sannakaisa Virtanen Professur für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)

Involved external institutions

Jiangsu University of Science and Technology CN China (CN)

How to cite

APA:

Dong, H., Xu, Y., Xu, W., Su, J., Zhuo, X., Wang, D.,... Wang, Y. (2025). Fabrication and degradation behavior of MAO-HA coating on Zn-Mg-Ag alloy. Surface & Coatings Technology, 503. https://doi.org/10.1016/j.surfcoat.2025.131959

MLA:

Dong, Hongzhou, et al. "Fabrication and degradation behavior of MAO-HA coating on Zn-Mg-Ag alloy." Surface & Coatings Technology 503 (2025).

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