No abstract

In this study, nanocrystalline Ni and Ni-diamond coatings were obtained by electrodeposition from tartrate electrolyte at ambient temperature to achieve good corrosion and wear resistance. Microhardness and adhesion tests respectively were performed for the wear resistance determination. Electrochemical impedance spectroscopy and linear polarization methods were used for corrosion resistance measurements and atomic force microscopy, and scanning electron microscopy were used for surface property characterization. The introduction of nanodiamond particles into the coating led to a rougher surface structure and a larger grain size in comparison with bare nickel coating. The study shows that the addition of 5•10 -2 (g•dm −3 ) of nanodiamonds to the plating bath is enough to obtain composite coatings with a clear increase in microhardness and wear resistance. The slightly improved corrosion resistance of the coating and decrease in corrosion current density from 0.41 to 0.14 μA•cm −2 in neutral chloride-containing medium, and nobler values of the corrosion potential were also observed.

Highlights Cu–Sn–TiO 2 nanocomposite coatings were electrodeposited under mechanical and ultrasonic agitation; Effect of TiO 2 nanoparticles and current density on structural and antibacterial properties was investigated. Distribution of TiO 2 in the coatings improved under ultrasonic agitation; Antibacterial activity of Cu–Sn–TiO 2 coatings was enhanced by ultrasonic agitation.

No abstract

No abstract

No abstract

No abstract

Chitosan is an attractive material for biomedical applications. A novel approach for the anodic electrodeposition of chitosan–AgNP composites using in situ coordination with copper ions is proposed in this work. The surface and cross-section morphology of the obtained coating with varying concentrations of AgNPs were evaluated by SEM, and surface functional groups were analyzed with FT-IR spectroscopy. The mechanism of the formation of the coating based on the chelation of Cu(II) ions with chitosan was discussed. The antibacterial activity of the coatings towards Staphylococcus epidermidis ATCC 35984/RP62A bacteria was analyzed using the live–dead approach. The presented results indicate that the obtained chitosan–AgNP-based films possess some limited anti-biofilm-forming properties and exhibit moderate antibacterial efficiency at high AgNP loads.