Narrow Results

Ni–P–TiO₂ composite coatings were deposited on brass substrates using a sol-enhanced electrodeposition method. The cyclic voltammetry tests were used to study the effect of TiO₂ sol on Ni–P deposition. The surface morphologies of Ni–P–TiO₂ deposits were observed, and their elemental analysis was also conducted. The systematic tests were performed to characterize the mechanical and corrosion behavior of as-prepared coatings. The voltammetric studies showed that the addition of TiO₂ sol at 12.5 mL/L slightly promoted the Ni–P electrodeposition, while the excessive addition at 50 mL/L reduced it. The results showed that the in-situ generated TiO₂ nanoparticles ( ∼15 nm diameter) could be highly dispersed in the electrolytic bath. The addition of TiO₂ sol at 12.5 mL/L slightly promoted the Ni–P electrodeposition, while the excessive addition at 50 mL/L caused the opposite.