Electrodeposition of Ni-W/TiO2 Composite Coatings on Q345 Pipeline Steel and their Corrosion Resistance and Anti-fouling Performance in Simulated Oilfield Wastewater

Ni-W/TiO2 composite coatings were electrodeposited on the surface of Q345 pipeline steel, and the corrosion resistance and anti-fouling performance of the composite coatings in simulated oilfield wastewater were studied. The results show that the concentration of TiO2 particles in the solution has a certain influence on the composition, surface morphology, contact angle and surface free energy of the Ni-W/TiO2 composite coating, resulting in obvious differences in the corrosion resistance and anti-fouling performance. Within a certain range, as the concentration of TiO2 particles increases, the amount of TiO2 particles doped in the composite coating increases, which can effectively reduce the activation energy of crystal nucleation and promote nucleation, so that the surface of the composite coating tends to be compact. The Ni-W/TiO2 composite coating prepared with the concentration of TiO2 particles 4 g/L has tight bonding and compact surface with the highest TiO2 particle content of 3.90%, the lowest surface free energy of 25.48 mN/m and the largest contact angle of 120°, which can effectively improve the corrosion resistance and anti-fouling performance of Q345 pipeline steel in simulated oilfield wastewater.