In vitro crevice corrosion of biodegradable magnesium in different solutions

doi:10.1016/j.jmst.2020.04.014

Abstract

Abstract:

Magnesium (Mg) is a promising biomedical metal because of its biodegradability. The crevice between tissue and Mg implant can not be neglected in some implantation sites due to inducing crevice corrosion of Mg. In this paper, a new single mold was designed to build the in vitro experimental setup and four kinds of solutions, i.e. the deionized water (DW), the 0.9 wt.% sodium chloride solution (NaCl), the phosphate buffer saline (PBS) and the modified simulated body fluid (m-SBF) were used to explore necessary factors of crevice corrosion in Mg. It was observed that crevice corrosion in Mg sheets would occur in NaCl and PBS solution under 0.2, 0.5 and 0.8 mm crevice thickness. And it was found that there were two necessary factors, i.e. chloride ion and crevice dimension, in crevice corrosion. For the high-purity Mg cannulated screws, crevice corrosion could occur inside tunnel when immersed in PBS.

Key words: Mg, Crevice corrosion, Cannulated screw, Chloride ion, Crevice size

Bowei Chen, Hongliu Wu, Ruibang Yi, Wenhui Wang, Haidong Xu, Shaoxiang Zhang, Hongzhou Peng, Junwei Ma, Haomiao Jiang, Rui Zan, Shuang Qiao, Yu Sun, Peng Hou, Pei Han, Jiahua Ni, Xiaonong Zhang. In vitro crevice corrosion of biodegradable magnesium in different solutions[J]. J. Mater. Sci. Technol., 2020, 52: 83-88.

Figures/Tables 6

Table 1 Chemical compositions (in parts per million (ppm)) of HP-Mg by weight.

Al	Si	Mn	Fe	Zn	Ti	Ni	Mg
10	20	20	20	20	<10	<5	Balance

Fig. 1. Pictures of (a) Mg sheet, (b) Mg cannulated screw, (c) schematic diagram of single crevice mold and (d) immersion setup.

Fig. 2. (a) Corrosion rates and pH values of Mg sheets immersed in (b) deionized water, (c) 0.9 wt.% NaCl solution, (d) PBS and (e) m-SBF.

Fig. 3. (a) Camera photos of Mg sheets immersed in the deionized water, the 0.9 wt.% NaCl solution, the PBS solution and the m-SBF solution (two red lines in every groups showed the position of crevice area and the red dots rectangle emphasized the specific groups with severe local corrosion pits), (b) at low and (c) at high magnification of the corrosion morphology in the NaCl-0.2 mm group.

Fig. 4. Surface morphologies of (a-c) external and (d-h) internal of Mg cannulated screw.

Fig. 5. Schematic mechanism of crevice corrosion occurred in biodegradable Mg.

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