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Biomimetic gelatine coating for less-corrosive and surface bioactive Mg–9Al–1Zn alloys

Published online by Cambridge University Press:  05 April 2018

Hanuma Reddy Tiyyagura ,
Regina Fuchs-Godec ,
Selestina Gorgieva ,
Srinivasan Arthanari ,
Mantravadi Krishna Mohan  and
Vanja Kokol
Hanuma Reddy Tiyyagura
Affiliation:
Faculty of Mechanical Engineering, University of Maribor, Maribor 2000, Slovenia; and NIT Warangal, National Institute of Technology, Telangana 506004, India
Regina Fuchs-Godec
Affiliation:
Faculty of Chemistry and Chemical Engineering, University of Maribor, Maribor 2000, Slovenia
Selestina Gorgieva
Affiliation:
Faculty of Mechanical Engineering, University of Maribor, Maribor 2000, Slovenia
Srinivasan Arthanari
Affiliation:
Magnesium Technology Innovation Centre, School of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
Mantravadi Krishna Mohan*
Affiliation:
NIT Warangal, National Institute of Technology, Telangana 506004, India
Vanja Kokol*
Affiliation:
Faculty of Mechanical Engineering, University of Maribor, Maribor 2000, Slovenia
*
a)Address all correspondence to these authors. e-mail: mkmohan@nitw.ac.in
b)e-mail: vanja.kokol@um.si
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Abstract

Magnesium (Mg)-based alloys have been emerging as innovative orthopedic materials due to their light weight and excellent biocompatibility. However, their too rapid degradation and subsequent loss of mechanical integrity before the bone tissue regeneration limits their applications. The presented study introduces in situ cross-linked gelatine (GEL) as a biomimetic coating onto Mg–9Al–1Zn-based alloys by carbodiimide chemistry and dip-coating. The bulk and surface morphology, chemistry, and bioactivity, as well as the corrosion behavior of uncoated and coated alloys were investigated in simulated body fluid (SBF) solution via in vitro testing and using various analytical techniques. The results revealed that the GEL coating mitigates the corrosion (from ∼2.08 to ∼1.19 mm/year) by forming a protective interface layer between the alloy surface and SBF solution, generating a bio-safer alkaline pH environment (pH ≈ 8.3), which minimizes the material resorption. GEL presence also stimulates the mineralization with calcium phosphate compounds, being patterned by its orientation and random coil conformation.

Keywords

alloypolymercorrosion
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 10 , 28 May 2018 , pp. 1449 - 1462
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Copyright
Copyright © Materials Research Society 2018 

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