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Hydrothermally coated Mg–1Zn–0.2Ag alloy with improved mechanical and corrosion properties: a comparative study on the role of substrate

Hashemi, M ; Sharif University of Technology | 2024

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  1. Type of Document: Article
  2. DOI: 10.1007/s10853-024-10157-x
  3. Publisher: 2024
  4. Abstract:
  5. The use of magnesium as an implant in a physiological environment is seriously challenged by its fast degradation rate, an effect that results in loss of mechanical support before the completion of the tissue healing. Among different methods, this paper focuses on the hydrothermal coating method, where the main focus is on the role of substrate microstructure on the overall quality of the formed coating under the same coating condition. In this study, an as-cast Mg–1Zn–0.2Ag alloy was processed using a variety of techniques, including solution heat treatment, extrusion and equal-channel angular pressing (ECAP). Hydrothermal coating was formed by placing samples in distilled water for 5 h at 160 °C and inside an autoclave. In addition to microstructural analysis and mechanical properties assessment, electrochemical corrosion and long-term immersion tests were performed on both the non-coated and coated samples. The obtained results indicate that while the extrusion and ECAP processes can significantly improve the mechanical properties, they can negatively affect the corrosion resistance in the non-coated state. However, applying hydrothermal coating on samples processed by extrusion and ECAP was significantly helpful in decreasing the corrosion rate. In the case of the ECAP-processed sample, the evolved hydrogen rate in the phosphate-buffered saline (PBS) decreased by about 91% after being hydrothermally coated, which shows excellent effectiveness of the synthesized coating. Among different samples, it can be claimed that the coated ECAP-processed sample demonstrated the best mechanical and corrosion behavior, due to the excellent coating quality and thickness. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024
  6. Keywords:
  7. Compressive strength ; Corrosion rate ; Corrosion resistance ; Corrosion resistant alloys ; Corrosion resistant coatings ; Corrosive effects ; Electrochemical corrosion ; Equal channel angular pressing ; Fracture mechanics ; Magnesium alloys ; Magnesium castings ; Metal cladding ; Phosphate coatings ; Physiological models ; Tissue regeneration ; Zinc alloys ; Channel angular pressing ; Comparatives studies ; Degradation rate ; Equal channel angular ; Hydrothermally ; Mechanical ; Mechanical and corrosion properties ; Mechanical support ; Physiological environment ; Tissue healing ; Extrusion
  8. Source: Journal of Materials Science ; Volume 59, Issue 34 , 2024 , Pages 16324-16340 ; 00222461 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s10853-024-10157-x