1. Deposition of nanostructured fluorine-doped hydroxyapatite-polycaprolactone duplex coating to enhance the mechanical properties and corrosion resistance of Mg alloy for biomedical applications
- Author
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Esah Hamzah, M. Kasiri-Asgarani, Hamid Reza Bakhsheshi-Rad, Saeid Jabbarzare, M.R. Abdul Kadir, and Nida Iqbal
- Subjects
Materials science ,Polyesters ,Composite number ,Alloy ,Bioengineering ,02 engineering and technology ,engineering.material ,010402 general chemistry ,01 natural sciences ,Corrosion ,Biomaterials ,chemistry.chemical_compound ,Coating ,Alloys ,Magnesium ,Composite material ,Metallurgy ,021001 nanoscience & nanotechnology ,Microstructure ,0104 chemical sciences ,Nanostructures ,Galvanic corrosion ,Compressive strength ,Durapatite ,chemistry ,Mechanics of Materials ,Polycaprolactone ,engineering ,0210 nano-technology - 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 (R(p)=2.9×10(3) kΩ cm(2)) 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.
- Published
- 2015