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Effect of surface treatment on the bioactivity and electrochemical behavior of magnesium alloys in simulated body fluid
Author(s) -
Sasikumar Y.,
Solomon M. M.,
Olasunkanmi L. O.,
Ebenso E. E.
Publication year - 2017
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201609317
Subject(s) - simulated body fluid , corrosion , scanning electron microscope , alloy , materials science , electrochemistry , fourier transform infrared spectroscopy , surface modification , magnesium , magnesium alloy , immersion (mathematics) , nuclear chemistry , chemical engineering , metallurgy , chemistry , composite material , electrode , mathematics , pure mathematics , engineering
The effect of surface treatment using NaOH or H 2 O 2 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 H 2 O 2 . 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. H 2 O 2 treated alloys demonstrated greater corrosion resistance in SBF than NaOH treated alloys.