Department of Mechanical engineering
Permanent URI for this collectionhttp://localhost:4000/handle/123456789/1921
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Item Electro-codeposited γ-Zn-Ni/Gr composite coatings: Effect of graphene concentrations in the electrolyte bath on tribo-mechanical, anti-corrosion and anti-bacterial properties(Taylor & Francis, 2021-10) Jha, Prabhat Nath; Rathore, Jitendra S.; Belgamwar, Sachin U.In this paper, low-cost and industrially scalable γ-Zn-Ni/Gr composite coatings were electro-codeposited from an acid-sulphate based electrolyte bath. The microstructure, morphology, composition, microhardness, wear performance, corrosion resistance and anti-bacterial properties of the composite coatings were investigated in detail and compared with a Zn-Ni alloy coating. The XRD diffraction peaks of prepared coatings confirm the presence of the γ phase of the Zn-Ni alloy. Results suggested that the addition of Gr effectively reduced the crystallite size and altered the morphology. As a result, the microhardness, wear performance and corrosion resistance were improved significantly. The γ-Zn-Ni/Gr composite coating prepared with 100 mg L−1 of Gr addition in the electrolyte bath displayed the highest microhardness of 243 HV and the lowest coefficient of friction of 0.32. The anti-bacterial activity tests confirmed that the γ-Zn-Ni/Gr composite coating (from the 100 mg L−1 bath) has the highest anti-bacterial activity against both Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus).Item Facile and Scalable Co-deposition of Anti-bacterial Zn-GNS Nanocomposite Coatings for Hospital Facilities: Tribo-Mechanical and Anti-corrosion Properties(Springer, 2021-10) Rathore, Jitendra S.; Jha, Prabhat Nath; Belgamwar, Sachin U.Frequently touched surfaces in the hospital environment act as a reservoir for the bacteria responsible for healthcare-associated infections (HCAIs). In this study, graphene nanosheets (GNS) were incorporated into a low-cost Zn coating using electrochemical co-deposition (ECD) to prevent HCAIs. The effects of different concentrations of GNS in the ECD bath (25 mg/L, 50 mg/L and 100 mg/L) were evaluated in detail for microstructural, tribo-mechanical, surface wetting, anti-corrosion, and anti-bacterial features of coatings. The microhardness, friction coefficient, wear loss, and polarization resistance values were remarkably improved from 77 HV, 0.7 mg, 26.1 mg and 13.68 kΩ cm2 mg for the pure Zn coating to 151 HV, 0.48 mg, 12.09 mg and 2.3 kΩ cm2 for the Zn-GNS (100 mg/L) nanocomposite coating, respectively. The anti-bacterial activities of the coatings were enhanced with the increase in GNS concertation in the ECD bath and Zn-GNS (100 mg/L) nanocomposite coating exhibited inhibition zones of 22 mm and 25 mm against Staphylococcus aureus and Escherichia coli bacteria.