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Sn coatings were widely used in electronic and device industries due to their unique properties. Sn-TiO2 sol-enhanced nanocomposite coatings were prepared in order to improve the mechanical properties of Sn coatings. The microstructure, mechanical properties and conductivity of sol-enhanced Sn-TiO2 nanocomposite coatings were systematically investigated. The results show that after adding an optimum quantity of TiO2 nanoparticles, the nanohardness of Sn-TiO2 coatings was increased by 75% while the conductivity remained unaltered when compared with a pure Sn coating. The effect of TiO2 sol addition on the properties of coatings was discussed. [ABSTRACT FROM AUTHOR]

Ni-Co-ZrO2 nanocomposite coatings have been electroplated on mild steel by adding ZrO2 nanoparticles into an Ni-Co plating solution. The microstructure and mechanical properties of nanocomposite coatings were systematically investigated. The results show that the microhardness of Ni-Co-ZrO2 nanocomposite coatings varied significantly with the quantity of ZrO2 nanoparticles. Ni-Co-10 g/L ZrO2 nanocomposite coating exhibited the optimum mechanical properties due to the dispersion strengthening effect. Addition of ZrO2 nanoparticles beyond 10 g/L led to particle agglomeration and caused a porous coating structure, resulting in a deterioration of coating mechanical properties. [ABSTRACT FROM AUTHOR]