| CUI Lan-yue,WU Si-si,XU Li-fen,ZENG Rong-chang,LI Shuo-qi,ZHANG Fen.Induction Effect of Layer-by-Layer Assembled PAH/PSS Multilayers to Construct Ca-P Coating on Magnesium Alloy[J],46(3):34-39 |
| Induction Effect of Layer-by-Layer Assembled PAH/PSS Multilayers to Construct Ca-P Coating on Magnesium Alloy |
| Received:November 27, 2016 Revised:March 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.03.005 |
| KeyWord:magnesium alloy corrosion biomaterial hydroxyapatite layer-by-layer assembly coating |
| Author | Institution |
| CUI Lan-yue |
Shandong University of Science and Technology, Qingdao , China |
| WU Si-si |
Shandong University of Science and Technology, Qingdao , China |
| XU Li-fen |
Shandong University of Science and Technology, Qingdao , China |
| ZENG Rong-chang |
Shandong University of Science and Technology, Qingdao , China |
| LI Shuo-qi |
Shandong University of Science and Technology, Qingdao , China |
| ZHANG Fen |
Shandong University of Science and Technology, Qingdao , China |
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| Abstract: |
| As biomedical materials, magnesium alloys have a wide application prospect due to their excellent biocompatibility and biodegradability. Effectively improving corrosion resistance of magnesium alloy was of great importance to biomedical materials. PSS/PAH multilayer films were prepared on the surface of AZ31 substrate based on layer-by-layer assembly by virtue of dip-coating method, then the modified samples were hydrothermal treated in the solution of Ca(NO)3, NaH2PO4 and Na2CO3 to induce the formation of Ca-P coating (HA). The surface morphology and chemical composition of the films were characterized by using high resolution scanning electron microscopy, Fourier infrared spectrometer and X-ray photoelectron spectroscopy. Hydrogen evolution and electrochemical experiment (including potentiodynamic polarization and electrochemical impedance spectroscopy) were conducted to study corrosion resistance of Ca-P/(PAH/PSS)5/Mg coating. The Ca-P coating was approximately 7.67 μm thick, in presence of leaf-like shape, randomly and densely arranged on the alloy. With Ca-P/(PAH/PSS)5/Mg coating thickness increased by one order of magnitude, the corrosion current density decreased from 3.69×10–5 to 1.61× 10–6 A/cm2, so did the hydrogen evolution rate. The corrosion resistance of the magnesium alloy can be im-proved effectively by the Ca-P coating, which can be ascribed to biological mineralization of the two assembled polyelectrolytes. The Ca-P coating obtained by induction provides a new idea application of magnesium alloy in biomedical field. |
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