Effect of 2 wt% Ag Addition on Corrosion Properties of ZK40 for Biodegradable Applications

M. AbdelGawad, B. Mansoor*, M. W. Vaughan, I. Karaman

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The antibacterial effects of silver make it an attractive alloying element for biodegradable Mg alloys to treat possible inflammation and infections caused by the degrading orthopedic implants. In this study, as-extruded Mg–4%Zn–0.5%Zr (ZK40) alloy was alloyed with Ag, specifically 2 wt%, and subjected to a heat treatment at 350 ℃ for 7 days. The mechanical and corrosion responses were studied in two orthogonal planes (transverse and extrusion) before and after silver addition to explore its potential for biodegradable orthopedic applications. Corrosion characteristics were assessed at 37 ℃ in Hank’s solution for 24 h via electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PD) and open circuit potential (OCP). As-extruded and heat-treated ZK40 alloy displayed an inhomogeneous microstructure containing large, coarse grains, Zn–Zr rich secondary phase and some fine grain regions. While in ZK40–Ag, both planes showed a relatively more homogenous microstructure but with some agglomeration of Zn–Ag rich secondary phases. Here, we present our initial results on the different corrosion behaviors observed in the two materials.

Original languageEnglish
Title of host publicationMagnesium Technology 2020
EditorsJ. Brian Jordon, Victoria Miller, Vineet V. Joshi, Neale R. Neelameggham
PublisherSpringer
Pages243-252
Number of pages10
ISBN (Print)9783030366469
DOIs
Publication statusPublished - 2020
Externally publishedYes
EventMagnesium Technology Symposium held at the 149th Annual Meeting and Exhibition, TMS 2020 - San Diego, United States
Duration: 23 Feb 202027 Feb 2020

Publication series

NameMinerals, Metals and Materials Series
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Conference

ConferenceMagnesium Technology Symposium held at the 149th Annual Meeting and Exhibition, TMS 2020
Country/TerritoryUnited States
CitySan Diego
Period23/02/2027/02/20

Keywords

  • Biodegradation
  • EIS
  • Mg alloys
  • Microstructure
  • Silver

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