In vitro corrosion resistance of layer-by-layer assembled polyacrylic acid multilayers induced Ca-P coating on magnesium alloy AZ31

Lan-Yue Cui; Shen-Cong Cheng; Lu-Xian Liang; Jing-Chao Zhang; Shuo-Qi Li; Zhen-Lin Wang; Rong-Chang Zeng

doi:10.1016/j.bioactmat.2020.02.001

In vitro corrosion resistance of layer-by-layer assembled polyacrylic acid multilayers induced Ca-P coating on magnesium alloy AZ31

Bioact Mater. 2020 Feb 10;5(1):153-163. doi: 10.1016/j.bioactmat.2020.02.001. eCollection 2020 Mar.

Authors

Lan-Yue Cui¹, Shen-Cong Cheng¹, Lu-Xian Liang¹, Jing-Chao Zhang¹, Shuo-Qi Li¹, Zhen-Lin Wang², Rong-Chang Zeng^{1

3}

Affiliations

¹ College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China.
² College of Materials Science and Engineering, Chongqing University of Technology, Chongqing, 400065, China.
³ School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450002, China.

Abstract

Biodegradable magnesium (Mg)-based alloys have aroused great concern owing to their promising characteristics as temporary implants for orthopedic application. But their undesirably rapid corrosion rate under physiological conditions has limited the actual clinical application. This study reports the use of a novel biomimetic polyelectrolyte multilayer template, based on polyvinylpyrrolidone (PVP) and polyacrylic acid (PAA) via layer-by-layer (LbL) assembly, to improve the corrosion resistance of the alloy. Surface characterization techniques (field-emission scanning electron microscopy, Fourier transform infrared (FTIR) spectrophotometer and X-ray diffractometer) confirmed the formation of biomineralized Ca-P coating on AZ31 alloy. Both hydrogen evolution and electrochemical corrosion tests demonstrated that the corrosion protection of the polyelectrolyte-induced Ca-P coating on AZ31 alloy. The formation mechanism of biomineralized Ca-P coating was proposed.

Keywords: Biomineralization; Calcium phosphate; Coating; Corrosion; Layer-by-layer assembly; Magnesium alloy.