Electrophoretic deposition of graphene on metallic substrates for electrochemical, tribological and antibacterial applications.
Date10th Mar 2022
Time03:00 PM
Venue Through Google Meet: https://meet.google.com/uea-rdki-kvb
PAST EVENT
Details
Among most promising metallic materials, titanium and its alloys are found indispensable in various fields of aviation, automotive, biomedical and marine sectors owing to their exceptional properties of light weight, high strength and biocompatibility. However, their poor abrasion and corrosion resistance behaviors are considered as major problems which lead to failure of industrial components. In recent years, graphene comprising of sp2 hybridized carbon atoms with 2-D hexagonal structure has gained huge attention as an anti-corrosive, anti-wear and anti-bacterial coating material on account of their unique properties of chemical inertness, low shear strength, high mechanical strength and lubricating nature which could prolong the service life of bare counterparts. Therefore, this study focusses on improvement of both electrochemical and tribological properties of cp-Ti (grade 2) by electrophoretic deposited (EPD) graphene coatings. Moreover, antibacterial activity of EPD coated graphene on Nitinol (Ni 52.35 wt.% and Ti 47.65 wt.%) substrate was investigated against two strains of E.coli and S.aureus bacteria. The corrosion and friction test results revealed that the smooth and compact microstructure of thin graphene coating of thickness 2.16μm exhibited superior corrosion resistance and lubricating properties (COF=∼0.02) compared to thick graphene coating of thickness 11.8μm (COF=∼0.17) with rough microstructure. However, thick graphene coating demonstrated higher durability of its lubricating behavior and good wear resistance property. Nevertheless, both graphene coatings displayed significant improvement in both corrosion and wear resistance properties of bare Ti substrate for various industrial applications. Furthermore, the antibacterial test suggested that oxidative stress mechanism is the main factor of antibacterial activity of EPD prepared graphene coatings.
Speakers
Ms. Madhusmita Mallick (ME16D013)
Department of Mechanical Engineering