Improving the corrosion resistance of biodegradable magnesium alloys by diffusion coating process

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

4 Scopus citations

Abstract

Magnesium alloys suffer from accelerated corrosion in physiological environment and hence their use as a structural material for biodegradable implants is limited. The present study focuses on a diffusion coating treatment that amplifies the beneficial effect of Neodymium on the corrosion resistance of magnesium alloys. The diffusion coating layer was obtained by applying 1 pm Nd coating on EW10X04 magnesium alloy using Electron-gun evaporator and PVD process. The coated alloy was heat treated at 350°C for 3 hours in a protective atmosphere of N2+0.2%SF6. The microstructure characteristics were evaluated by SEM, XRD, and XPS; the corrosion resistance was examined by potentiodynamic polarization and EIS analysis. The corrosion resistance of the diffusion coated alloy was significantly improved compared to the uncoated material. This was related to: (i) formation of Nd20s in the outer scale, (ii) integration of Nd in the MgO oxide layer, and (iii) formation of secondary phase Mg4iNds along the grain boundaries of a-Mg.

Original languageEnglish
Title of host publicationMagnesium Technology 2015 - Held During TMS 2015 144th Annual Meeting and Exhibition
EditorsMichele V. Manuel, Alok Singh, Martyn Alderman, Martyn Alderman, Neale R. Neelameggham
PublisherMinerals, Metals and Materials Society
Pages403-406
Number of pages4
ISBN (Electronic)9781119082439
DOIs
StatePublished - 1 Jan 2015
EventMagnesium Technology 2015 - TMS 2015 144th Annual Meeting and Exhibition - Orlando, United States
Duration: 15 Mar 201519 Mar 2015

Publication series

NameMagnesium Technology
Volume2015-January
ISSN (Print)1545-4150

Conference

ConferenceMagnesium Technology 2015 - TMS 2015 144th Annual Meeting and Exhibition
Country/TerritoryUnited States
CityOrlando
Period15/03/1519/03/15

Keywords

  • Biodegradable implants
  • Diffusion coating
  • Magnesium
  • Neodymium

ASJC Scopus subject areas

  • Engineering (all)

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