title: Deposition of nanostructured fluorine-doped hydroxyapatite-polycaprolactone duplex coating to enhance the mechanical properties and corrosion resistance of Mg alloy for biomedical applications.
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.
authors.affiliation: Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia; Medical Devices & Technology Group (MEDITEG), Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia; Advanced Materials Research Center, Materials Engineering Department, Najafabad Branch, Islamic Azad University, Najafabad, Iran. Electronic address: rezabakhsheshi@gmail.com.
authors.forename: H R
authors.initials: HR
authors.lastname: Bakhsheshi-Rad
authors.affiliation: Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia.
authors.forename: E
authors.initials: E
authors.lastname: Hamzah
authors.affiliation: Advanced Materials Research Center, Materials Engineering Department, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Kasiri-Asgarani
authors.affiliation: Advanced Materials Research Center, Materials Engineering Department, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
authors.forename: S
authors.initials: S
authors.lastname: Jabbarzare
authors.affiliation: Medical Devices & Technology Group (MEDITEG), Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia.
authors.forename: N
authors.initials: N
authors.lastname: Iqbal
authors.affiliation: Medical Devices & Technology Group (MEDITEG), Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia.
authors.forename: M R
authors.initials: MR
authors.lastname: Abdul Kadir
mesh_terms: D000497:Alloys / Q000737:chemistry*; D003343:Corrosion; D017886:Durapatite / Q000737:chemistry*; D008274:Magnesium / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D011091:Polyesters / Q000737:chemistry*
chemical_list: D000497:Alloys; D011091:Polyesters; C016240:polycaprolactone; D017886:Durapatite; D008274:Magnesium
keywords: Biodegradable; Corrosion; Electrodeposition; Fluorine-doped hydroxyapatite; Mg alloy; Polycaprolactone