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Description:

Carbonate apatite (CAp) coating has been developed as a bioabsorbable corrosion-control coating for biodegradable Mg alloys. Carbonate content in the CAp coatings can be utilized to control the bioabsorbability and corrosion rate of CAp-coated Mg alloys. In this study, the carbonate content in the CAp coatings of pure Mg was varied by NaHCO3 concentration of the coating solution from 0.25 to 1.0 mol/L, and hydroxyapatite (HAp) was formed without NaHCO3. The CAp and HAp coatings were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The carbonate content in the apatite coatings formed with 0, 0.25, 0.5 and 1.0 mol/L NaHCO3 was determined to be 2, 12, 15 and 18wt%, respectively, from the apatite 002 plane XRD peak position using the existing conversion constant as well as from the coating composition obtained by the XPS analysis. The values of carbonate content obtained by each method were in good accordance, indicating that the carbonate content can be determined simply by XRD measurements. Two types of carbonate group were present in the CAp coatings, CO32- and HCO3-, and the relative content of HCO3- to CO32- increased with an increase in the carbonate content.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Carbonate apatite coating, Biodegradable magnesium, Carbonate content, Biomaterial

Date published: 2023-12-06

Publisher: Elsevier BV

Journal:

• Ceramics International (ISSN: 02728842) vol. 50 issue. 4 p. 6784-6792

Funding:

• JSPS KAKENHI 19H02449
• JSPS KAKENHI 22H01798
• The Light Metal Educational Foundation (研究補助金)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4329

First published URL: https://doi.org/10.1016/j.ceramint.2023.12.021

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Updated at: 2025-12-06 12:30:17 +0900

Published on MDR: 2025-12-06 08:34:04 +0900