Effect of surface treatment on the bioactivity and electrochemical behavior of magnesium alloys in simulated body fluid

Y. Sasikumar, M. M. Solomon, L. O. Olasunkanmi, E. E. Ebenso

Research output: Journal PublicationArticlepeer-review

27 Citations (Scopus)

Abstract

The effect of surface treatment using NaOH or H2O2 on the bioactivity and corrosion behavior of AZX310, AZ91D, AM50, and AZ31 Mg alloys in simulated body fluid (SBF) has been studied with the aid of surface morphological assessment, in vitro characterization, and electrochemical measurements. The influence of immersion time on the behavior of the treated alloys in SBF was also investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses confirmed successful surface modification upon treatment of alloy surface with NaOH and H2O2. XRD and SEM analyses also revealed that surface modification enhances formation and growth of hydroxyapatite (HA). Formation of HA layer on the alloy surface was further confirmed by Fourier transform infrared spectroscopy analysis. In vitro immersion test reveals that pH of SBF solution containing treated alloys is lower than that containing untreated alloy. However, pH increases with immersion time. Results from weight loss and electrochemical measurements indicate that treated alloys possess higher corrosion resistance in SBF than the untreated ones. H2O2 treated alloys demonstrated greater corrosion resistance in SBF than NaOH treated alloys.

Original languageEnglish
Pages (from-to)776-790
Number of pages15
JournalMaterials and Corrosion - Werkstoffe und Korrosion
Volume68
Issue number7
DOIs
Publication statusPublished - Jul 2017
Externally publishedYes

Keywords

  • electrochemistry
  • magnesium alloys
  • surface treatment

ASJC Scopus subject areas

  • Environmental Chemistry
  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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