摘要
A hydrothermal deposition method was utilized to fabricate Ca-P composite coating induced by the layer-by-layer(LbL)assembled polyvinylpyrrolidone/deoxyribonucleic acid(PVP/DNA)_(20) multilayer on AZ31 alloy.The surface morphology and compositions were characterized by SEM,EDS,FTIR and XRD.Besides,the corrosion resistance and degradation behavior of the coating were tested via electrochemical polarization,impedance spectroscopy and immersion measurements.Results show that the main components of Ca-P coatings are hydroxyapatite,Ca_(3)(PO_(4))_(2) and Mg_(3)(PO_(4))_(2)·nH_(2)O.The LbL-assembled DNA and PVP promote the adsorption of Ca-P deposits on the sample surface,and structures and functional groups of the polyelectrolyte in the outermost layer are the primary influencing factor for the induction of the Ca-P coating.Carboxyl groups have the best biomineralization effect among all related functional groups.The enhanced corrosion resistance and adhesion highlight a promising use of(PVP/DNA)_(20)-induced Ca-P coatings in the field of biomedical magnesium alloys.
基金
This work was supported by the National Natural Science Foundation of China(Grant No.52071191)
the Natural Science Foundation of Shandong Province(ZR2020QE009)
the Research Start-up Fund of Shandong University of Science and Technology(01040125219)
the“Elite Plan”Foundation of Shandong University of Science and Technology(0104060541112).
