Bakhsheshi-Rad, H. R. and Hamzah, E. and Kasiri-Asgarani, M. and Jabbarzare, S. and Iqbal, N. and Abdul Kadir, M. R. (2016) Deposition of nanostructured fluorine-doped hydroxyapatite-polycaprolactone duplex coating to enhance the mechanical properties and corrosion resistance of Mg alloy for biomedical applications. Materials Science and Engineering C, 60 . pp. 526-537. ISSN 0928-4931
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Abstract
The present study addressed the synthesis of a bi-layered nanostructured fluorine-doped hydroxyapatite (nFHA)/polycaprolactone (PCL) coating on Mg-2Zn-3Ce alloy via a combination of electrodeposition (ED) and dip-coating methods. The nFHA/PCL composite coating is composed of a thick (70-80 μm) and porous layer of PCL that uniformly covered the thin nFHA film (8-10 μm) with nanoneedle-like microstructure and crystallite size of around 70-90 nm. Electrochemical measurements showed that the nFHA/PCL composite coating presented a high corrosion resistance (Rp = 2.9 × 103 kΩ cm2) and provided sufficient protection for a Mg substrate against galvanic corrosion. The mechanical integrity of the nFHA/PCL composite coatings immersed in SBF for 10 days showed higher compressive strength (34% higher) compared with the uncoated samples, indicating that composite coatings can delay the loss of compressive strength of the Mg alloy. The nFHA/PCL coating indicted better bonding strength (6.9 MPa) compared to PCL coating (2.2 MPa). Immersion tests showed that nFHA/PCL composite-coated alloy experienced much milder corrosion attack and more nucleation sites for apatite compared with the PCL coated and uncoated samples. The bi-layered nFHA/PCL coating can be a good alternative method for the control of corrosion degradation of biodegradable Mg alloy for implant applications.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Cerium alloys, Compressive strength, Corrosion, Corrosion resistance, Crystallite size, Electrodeposition, Electrodes, Fluorine, Hydroxyapatite, Medical applications, Nanocomposite films, Phosphate minerals, Polycaprolactone, Biodegradable, Biomedical applications, Corrosion degradation, Dipcoating methods, Electrochemical measurements, Fluorine-doped, Mechanical integrity, Mg alloy, Composite coatings, alloy, hydroxyapatite, magnesium, nanomaterial, polycaprolactone, polyester, chemistry, corrosion, Alloys, Corrosion, Durapatite, Magnesium, Nanostructures, Polyesters |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Mechanical Engineering |
| ID Code: | 73846 |
| Deposited By: | Haliza Zainal |
| Deposited On: | 20 Nov 2017 00:47 |
| Last Modified: | 20 Nov 2017 00:47 |
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