Effect of bicarbonate on biodegradation behaviour of pure magnesium in a simulated body fluid

Li, Zaichun, Song, Guang-Ling and Song, Shizhe (2014) Effect of bicarbonate on biodegradation behaviour of pure magnesium in a simulated body fluid. Electrochimica Acta, 115 56-65. doi:10.1016/j.electacta.2013.10.131


Author Li, Zaichun
Song, Guang-Ling
Song, Shizhe
Title Effect of bicarbonate on biodegradation behaviour of pure magnesium in a simulated body fluid
Journal name Electrochimica Acta   Check publisher's open access policy
ISSN 0013-4686
1873-3859
Publication date 2014-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.electacta.2013.10.131
Volume 115
Start page 56
End page 65
Total pages 10
Publisher Pergamon
Language eng
Subject 1603 Demography
1500 Chemical Engineering
Abstract The effect of bicarbonate on biodegradation of pure magnesium in a simulated body fluid is investigated by means of X-ray diffraction, X-ray photoelectron spectroscopy, polarization curve and electrochemical impedance spectroscopy. The results show that magnesium biodegrades rapidly and non-uniformly during 27 h of immersion in four simulated body fluid solutions containing different concentrations of bicarbonate. The biodegradation rate first decreases and then increases with time. A small amount of bicarbonate in simulated body fluid has an inhibition effect on the Mg dissolution, while an overdose of bicarbonate addition activates the magnesium surface in the simulated body fluid. The interesting phenomena can be interpreted by a surface film model involving precipitation of calcium carbonate and further ionization of bicarbonate in the simulated body fluids, incorporation of calcium, carbonate and phosphate compounds in the surface film, and development of chloride-induced pitting corrosion damage on the magnesium with time.
Keyword Biodegradability
EIS
Magnesium
Surface film
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
 
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