abstract
In this paper a detailed investigation for corrosion behavior of magnesium substrate electrodeposited differently by nanoparticles like Reduced Graphene Oxide (r-GO synthesized through Modified Hummer's Method), Silicon Carbide (SiC-mechanically alloyed) and also r-GO/SiC nanocomposites (dispersed through ultrasonication process) as coating materials for varying time period was done. Synthesized nanocomposite was characterized through various physio-chemical techniques and confirmation of the same was carried out. Surface morphology of the developed set of specimens was scrutinized through SEM and EDAX which establishes a clean surface coating with minimal defects attainment through electro deposition technique. Electrochemical corrosion behavior for the magnesium substrates coated with r-GO, SiC, r-GO/SiC for 5 and 10 min coating time period was conceded over in 0.1 M of NaCl and Na2SO4 aqueous solution using Tafel polarization and then compared with a pure magnesium substrate. r-GO/SiC nanocomposite coated magnesium substrate showcased a drastic breakthrough in corrosion resistance when compared with other set of specimens in aqueous medium. Delamination behavior for the same set of specimens was carried and the r-GO/SiC nanocomposite coated magnesium exposed a minimum delamination area accounting to the hydrophobic property of graphene and the binding effect of SiC nano particles. (C) 2017 Elsevier B.V. All rights reserved.
keywords
ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; GRAPHENE OXIDE; HYDROGEN EMBRITTLEMENT; MECHANICAL-PROPERTIES; MATRIX COMPOSITES; GRAIN-BOUNDARY; RESISTANCE; COATINGS; ALLOY; NICKEL
subject category
Chemistry; Materials Science; Physics
authors
Kavimani, V; Prakash, KR; Rajesh, R; Rammasamy, D; Selvaraj, NB; Yang, T; Prabakaran, B; Jothi, S
our authors
Nivas Babu Selvaraj
Post-Doc Fellowship
Tinghai Yang
Post-doc FellowshipGroups
acknowledgements
Corresponding author Dr. Sathiskumar Jothi acknowledges the ASTUTE 2020 (Advanced Sustainable Manufacturing Technologies; Project number: 80814) which is part-funded by the European Regional Development Fund through the Wales Government and the participating Higher Education Institutions.