Long-term in vitro corrosion behavior of Zn-3Ag and Zn-3Ag-0.5Mg alloys considered for biodegradable implant applications

Maria Wątroba, Krzysztof Mech, Wiktor Bednarczyk, Jakub Kawałko, Marianna Marciszko-Wiąckowska, Mateusz Marzec, Duncan E.T. Shepherd, Piotr Bała

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In this paper, Zn-3Ag and Zn-3Ag-0.5Mg alloys were studied in terms of applicability as biodegradable implant materials. The performed tensile, compression and bending tests indicate a high strengthening effect induced by the Ag and Mg additions, additionally resulting in grain size refinement. It was shown that sustaining plastic strain during deformation depends on the applied stress causing asymmetric mechanical behavior of the tested Zn-based materials. Electrochemical measurements and immersion tests in Hanks' solution lasting up to 180 days revealed that Ag and Mg contribute to the change of the Zn matrix's open circuit potential and the formation of micro-galvanic cells between the Zn grains and precipitates. The fine-grained microstructure and evenly distributed small precipitates led to uniform corrosion occurring via pit formation on the corroded surface due to intergranular and micro-galvanic corrosion mechanisms. The corrosion rate of the Zn-3Ag-0.5Mg alloy after 180 days was almost twice that of pure Zn and the Zn-3Ag alloy.
Original languageEnglish
Article number110289
JournalMaterials and Design
Volume213
Early online date2 Dec 2021
DOIs
Publication statusPublished - 1 Jan 2022

Keywords

  • Biodegradation
  • Electrochemical measurements
  • Galvanic corrosion
  • Mechanical properties
  • Microstructure
  • Zn alloys

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