In vitro degradation resistance of glucose and L-cysteine-bioinspired Schiff-base anodic Ca-P coating on AZ31 magnesium alloy

Xue-meiWANG,Xiao-liFAN,Mei-qiZENG,Chang-yangLI,Lan-yueCUI,Xiao-boCHEN,Yu-hongZOU,Zhen-linWANG,Rong-changZENG,

doi:10.1016/S1003-6326(22)65888-6

Transactions of Nonferrous Metals Society of China >

2022 , Vol. 32 >Issue 5: 1485 - 1500

DOI: https://doi.org/10.1016/S1003-6326(22)65888-6

Materials Science and Engineering

In vitro degradation resistance of glucose and L-cysteine-bioinspired Schiff-base anodic Ca-P coating on AZ31 magnesium alloy

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Xue-mei WANG¹, Xiao-li FAN¹, Mei-qi ZENG¹, Chang-yang LI¹, Lan-yue CUI¹, Xiao-bo CHEN², Yu-hong ZOU³, Zhen-lin WANG⁴, Rong-chang ZENG¹^,⁵

1. Corrosion Laboratory for Light Metals, College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
2. School of Engineering, RMIT University, Carlton 3053, VIC, Australia;
3. School of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
4. School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;
5. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China

Online published: 2022-05-25

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Abstract

A Schiff base (a compound containing a C=N bond) induced anodic Ca-P coating was prepared on AZ31 Mg alloy in a mixed solution of CaCl₂ and KH₂PO₄ at 60 °C in the presence of glucose and L-cysteine. The microstructure and chemical composition of the coatings were characterized using FE-SEM, FT-IR, XRD, and XPS. The in vitro degradation resistance of the coated samples was evaluated via potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), and hydrogen evolution test. The experimental results show that the Ca-P_S_{chiff base} coating is composed of CaHPO₄ (DCPA) and hydroxyapatite (HA), whereas HA is not present in the Ca-P coating. The Ca-P_S_{chiff base} coating thickness is about 2 times that of Ca-P coating (Ca-P coating: (9.13±4.20) μm and Ca-P_S_{chiff base}: (18.13±5.78) μm). The corrosion current density of the Ca-P_S_{chiff base} coating is two orders of magnitude lower than that of the Ca-P coating. The formation mechanism of the Ca-P_S_{chiff base} is proposed.

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Xue-meiWANG,Xiao-liFAN,Mei-qiZENG,Chang-yangLI,Lan-yueCUI,Xiao-boCHEN,Yu-hongZOU,Zhen-linWANG,Rong-changZENG, . In vitro degradation resistance of glucose and L-cysteine-bioinspired Schiff-base anodic Ca-P coating on AZ31 magnesium alloy[J]. Transactions of Nonferrous Metals Society of China, 2022 , 32(5) : 1485 -1500 . DOI: 10.1016/S1003-6326(22)65888-6

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