Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 32, Issue 5, Pages 1485-1500Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(22)65888-6
Keywords
magnesium alloy; anodic coating; corrosion resistance; Schiff base; biomaterial
Categories
Funding
- National Natural Science Foundation of China [52071191]
- Open Foundation of Hubei Key Laboratory of Advanced Technology for Automotive Components, China [XDQCKF2021006]
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In this study, a Schiff base-induced calcium phosphate coating was successfully prepared, which exhibited improved degradation resistance and corrosion protection compared to the traditional pure calcium phosphate coating. The Schiff base coating also had a larger thickness than the pure calcium phosphate coating.
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 degrees 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-Schiff base coating is composed of CaHPO4 (DCPA) and hydroxyapatite (HA), whereas HA is not present in the Ca-P coating. The Ca-P-Schiff base coating thickness is about 2 times that of Ca-P coating (Ca-P coating: (9.13 +/- 4.20) mu m and Ca-P-Schiff base: (18.13 +/- 5.78) mu m). The corrosion current density of the Ca-P-Schiff base coating is two orders of magnitude lower than that of the Ca-P coating. The formation mechanism of the Ca-P-Schiff base is proposed.
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