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In vitro investigation of biodegradable polymeric coating for corrosion resistance of Mg-6Zn-Ca alloy in simulated body fluid

DSpace at IIT Bombay

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Title In vitro investigation of biodegradable polymeric coating for corrosion resistance of Mg-6Zn-Ca alloy in simulated body fluid
 
Creator GAUR, S
RAMAN, RKS
KHANNA, AS
 
Subject Magnesium alloy
Body implant
Silanes
Hydrogen evolution
Corrosion
Electrochemical impedance spectroscopy
SOL-GEL COATINGS
MAGNESIUM ALLOYS
RARE-EARTH
DEGRADATION
BEHAVIOR
IMPLANTS
MICROSTRUCTURE
CYTOTOXICITY
PERFORMANCE
PROTECTION
 
Description A silane-based biodegradable coating was developed and investigated to improve corrosion resistance of an Mg-6Zn-Ca magnesium alloy to delay the biodegradation of the alloy in the physiological environment. Conditions were optimized to develop a stable and uniform hydroxide layer on the alloys-surface-known to facilitate silane-substrate adhesion. A composite coating of two silanes, namely, diethylphosphatoethyltriethoxysilane (DEPETES) and bis-[3-(triethoxysilyl) propyl] tetrasulfide (BTESPT), was developed, by the sol-gel route. Corrosion resistance of the coated alloy was characterized in a modified-simulated body fluid (m-SBF), using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The silane coating provided significant and durable corrosion resistance. During the course of this, hydrogen evolution and pH variation, if any, were monitored for both bare and coated alloys. The coating morphology was characterized using scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX) and the cross-linking in the coating was studied using Fourier transform infrared spectroscopy (FTIR). As indicated by X-ray diffraction (XRD) results, an important finding was the presence of hydrated magnesium phosphate on the sample that was subjected to immersion in m-SBF for 216 h. Magnesium phosphate is reported to support osteoblast formation and tissue healing. (C) 2014 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2014-12-28T15:28:27Z
2014-12-28T15:28:27Z
2014
 
Type Article
 
Identifier MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS, 4291-101
0928-4931
1873-0191
http://dx.doi.org/10.1016/j.msec.2014.05.035
http://dspace.library.iitb.ac.in/jspui/handle/100/16873
 
Language English