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Published on: July 4, 2017
Effect of TiO2 Concentration on Microstructure and Properties of Composite Cu-Sn-TiO2 Coatings Obtained by
Aliaksandr A Kasach1, Dzmitry S Kharytonau2, Andrei V Paspelau3
1Department of Chemistry, Electrochemical Production Technology and Materials for Electronic Equipment, Chemical Technology and Engineering Faculty, Belarusian State Technological University, Sverdlova 13a, 220006 Minsk, Belarus.
Abstract:
In this work, Cu-Sn-TiO2 composite coatings were electrochemically obtained from a sulfate bath containing 0-10 g/L of TiO2 nanoparticles. The effect of TiO2 particles on kinetics of cathodic electrodeposition has been studied by linear sweep voltammetry and chronopotentiometry. As compared to the Cu-Sn alloy, the Cu-Sn-TiO2 composite coatings show rougher surfaces with TiO2 agglomerates embedded in the metal matrix. The highest average amount of included TiO2 is 1.7 wt.%, in the case of the bath containing 5 g/L thereof. Composite coatings showed significantly improved antibacterial properties towards E. coli ATCC 8739 bacteria as compared to the Cu-Sn coatings of the same composition. Such improvement has been connected with the corrosion resistance of the composites studied by linear polarization and electrochemical impedance spectroscopy. In the bacterial media and 3% NaCl solutions, Cu-Sn-TiO2 composite coatings have lower corrosion resistance as compared to Cu-Sn alloys, which is caused by the nonuniformity of the surface.
