Preparation and Properties of Sn-TiO2 nanocomposite coatings

Sn-TiO 2 nanocomposite coatings were prepared by sol-gel enhanced electrodeposition technique and the effect of c concentration on the performance of the composite coatings was investigated by adding different volumes of TiO 2 sol to the electrolyte. The microscopic morphology and corrosion resistance of the coatings were characterized by XRD tests, SEM tests, hardness tests and a series of electrochemical tests. From the test results, it was found that the coating had the highest hardness value and the best corrosion resistance when the TiO 2 sol was added at 15 mL/L; however, when the TiO 2 sol concentration was too large, the corrosion resistance and hardness value of the Sn-TiO 2 composite coating decreased significantly due to the destruction of the crystal structure and coating structure by the agglomerated TiO 2 nanoparticles in the coating.