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Improved corrosion protection of titanium implant material by crystallographic texturing of Sr doped calcium phosphate electrodeposits
Balakrishnan Munirathinam, Nitesh R. Jaladurgam, J. Magesh, Ramaswamy Narayanane, Mol J.M.C, Munirathinam B, Lakshman Neelakantan, ,
Published in Elsevier B.V.
2019
Volume: 675
   
Pages: 115 - 121
Abstract
Nanocrystalline calcium phosphate (CaP) coatings can provide biocompatibility and corrosion protection to biomaterials upon implementation in the human body. While the long term stability of recently developed coatings in biological environment proves to be challenging, the present work tailors the surface by orienting the growth (crystallographic texturing) of strontium doped CaP coatings in order to increase their corrosion resistance. X-ray diffraction (XRD) as well as selected area electron diffraction patterns from transmission electron microscopy reveal that nanocrystalline CaP crystallizes in hexagonal hydroxyapatite structure preferentially oriented along the c-axis. Orientation distribution function obtained from XRD texture studies confirms the presence of a [0001] fiber texture and the estimated texture index indicates the evolution of texture with increasing deposition current density. Polarization studies point out that increasingly textured coatings decrease the corrosion current density by an order of magnitude (from 2.43 × 10 −7 to 3.46 × 10 −8 A cm −2 ). Impedance measurements confirm that oriented growth of film renders improved corrosion resistance. This study demonstrates that oriented growth of electrodeposited films strongly improves the corrosion performance of titanium, which can be employed in design and development of highly corrosion resistive implant materials. © 2019 Elsevier B.V.
About the journal
JournalData powered by TypesetThin Solid Films
PublisherData powered by TypesetElsevier B.V.
ISSN00406090
Open AccessNo
Concepts (28)
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    Biocompatibility
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    Biology
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    Calcium phosphate
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    Corrosion resistance
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    Distribution functions
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    Electrodeposition
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    Electrodes
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    Electron diffraction
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    Films
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    High resolution transmission electron microscopy
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    Hydroxyapatite
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    Metal implants
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    Nanocrystals
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    Phosphate coatings
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    Phosphorus compounds
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    Strontium compounds
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    Textures
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    Titanium
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    X ray diffraction
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    BIOLOGICAL ENVIRONMENTS
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    CORROSION CURRENT DENSITIES
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    Crystallographic texturing
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    DEPOSITION CURRENT DENSITY
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    Design and development
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    HEXAGONAL HYDROXYAPATITES
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    ORIENTATION DISTRIBUTION FUNCTION
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    SELECTED AREA ELECTRON DIFFRACTION PATTERN
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    CORROSION RESISTANT COATINGS