<i>In vitro </i>corrosion of magnesium alloy AZ31 --- a synergetic influence of glucose and Tris

doi:10.1007/s11706-018-0424-1

Front. Mater. Sci.

2018, Vol. 12

Issue (2) : 184-197 https://doi.org/10.1007/s11706-018-0424-1

RESEARCH ARTICLE

In vitro corrosion of magnesium alloy AZ31 --- a synergetic influence of glucose and Tris

Ling-Yu LI¹, Bin LIU¹, Rong-Chang ZENG¹(

), Shuo-Qi LI¹, Fen ZHANG¹, Yu-Hong ZOU³, Hongwei (George) JIANG², Xiao-Bo CHEN², Shao-Kang GUAN⁴, Qing-Yun LIU³(

)

¹. School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266510, China
². School of Engineering, RMIT University, Carlton 3053, Australia
³. College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
⁴. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China

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Abstract

Biodegradable Mg alloys have generated great interest for biomedical applications. Accurate predictions of in vivo degradation of Mg alloys through cost-effective in vitro evaluations require the latter to be conducted in an environment close to that of physiological scenarios. However, the roles of glucose and buffering agents in regulating the in vitro degradation performance of Mg alloys has not been elucidated. Herein, degradation behavior of AZ31 alloy is investigated by hydrogen evolution measurements, pH monitoring and electrochemical tests. Results indicate that glucose plays a content-dependent role in degradation of AZ31 alloy in buffer-free saline solution. The presence of a low concentration of glucose, i.e. 1.0 g/L, decreases the corrosion rate of Mg alloy AZ31, whereas the presence of 2.0 and 3.0 g/L glucose accelerates the corrosion rate during long term immersion in saline solution. In terms of Tris-buffered saline solution, the addition of glucose increases pH value and promotes pitting corrosion or general corrosion of AZ31 alloy. This study provides a novel perspective to understand the bio-corrosion of Mg alloys in buffering agents and glucose containing solutions.

Keywords magnesium alloys corrosion glucose Tris biomaterials

Corresponding Author(s): Rong-Chang ZENG,Qing-Yun LIU

Online First Date: 14 May 2018 Issue Date: 29 May 2018

Cite this article:

Ling-Yu LI,Bin LIU,Rong-Chang ZENG, et al. In vitro corrosion of magnesium alloy AZ31 --- a synergetic influence of glucose and Tris[J]. Front. Mater. Sci., 2018, 12(2): 184-197.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-018-0424-1
https://academic.hep.com.cn/foms/EN/Y2018/V12/I2/184

Fig.1 SEM and EDS analyses (wt.%) of AZ31 alloy after immersion in 0.9% NaCl solutions with different glucose contents for 120 h: (a)(b) 0 g/L glucose; (c)(d) 1.0 g/L glucose; (e)(f) 2.0 g/L glucose; (g)(h) 3.0 g/L glucose.

Tab.1 Chemical compositions of spectra detected by EDS in Fig. 1 in wt.% (at.%)

Fig.2 XRD patterns of AZ31 alloy after immersion in 0.9% NaCl solutions with different glucose contents for 120 h.

Fig.3 FTIR spectra of AZ31 surface after immersion in 0.9% NaCl solution with different glucose contents for 120 h.

Fig.4 Polarization curves of AZ31 samples after immersion in 0.9% NaCl solutions with different glucose contents.

Tab.2 Electrochemical parameters of PDP curves in 0.9% NaCl solutions containing various glucose contents

Fig.5 AZ31 samples immersed in 0.9% NaCl solutions with different glucose contents (0, 1.0, 2.0, and 3.0 g/L) for 120 h: (a) hydrogen evolution volumes and (b) enlarged plots; (c) variations of pH values and (d) enlarged plots.

Fig.6 SEM and EDS analyses of AZ31 alloy after immersion in 0.9% NaCl and 6.118 g/L Tris solutions with different glucose contents for 18 h: (a)(b)(c) 0 g/L glucose; (d)(e)(f) 1 g/L glucose; (g)(h)(i) 2 g/L glucose; (j)(k)(l) 3 g/L glucose. The EDS was organized by wt.%.

Fig.7 XRD patterns of AZ31 surface after immersion in Tris-buffered saline solutions with different glucose contents for 18 h.

Fig.8 FTIR spectra of AZ31 surface after immersion in Tris-buffered saline solutions with different glucose contents for 18 h.

Fig.9 Polarization curves of AZ31 samples after immersion in Tris-buffered saline solutions with different glucose concentrations.

Tab.3 Electrochemical parameters of PDP curves in Tris-buffered saline solutions with different glucose concentrations

Fig.10 (a) Hydrogen evolution volume and (b) pH values as a function of time for AZ31 samples immersed in Tris-buffered saline solutions with different glucose contents (0, 1.0, 2.0, and 3.0 g/L) for 18 h.

Fig.11 Two types of schematic illustration of corrosion process of AZ31 alloy during exposure to 0.9% NaCl solution with different glucose contents: (a) initial corrosion of AZ31 alloy in neat 0.9% NaCl solution; (b) 0.9% NaCl solution containing 1.0 g/L glucose; (c) 0.9% NaCl solution containing 2.0 and 3.0 g/L glucose.

Fig.12 Schematic illustration of corrosion process of AZ31 alloy during exposure to Tris-buffered saline solutions with glucose: (a) initial corrosion of AZ31 alloy in Tris-buffered saline solution; (b) Tris-buffered saline solution containing 1.0, 2.0 and 3.0 g/L glucose.

Fig.13 Cross-sectional images and corresponding EDS spectra of degradation products formed on AZ31 alloy surface for two kinds of solutions of various glucose contents: (a)(b) 0 g/L glucose, (c)(d) 1.0 g/L glucose, (e)(f) 2.0 g/L glucose, (g)(h) 3.0 g/L glucose in saline solution; (i)(j) 0 g/L glucose, (k)(l) 1.0 g/L glucose, (m)(n) 2.0 g/L glucose, (o)(p) 3.0 g/L glucose in Tris-buffered saline solutions.

Fig.14 Histogram in comparison with pH value (13 h), HE (13 h), i_corr and potential between saline solution and Tris-buffered saline solution with and without glucose.

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