Corrosion behavior in saline solution of Pulsed Electrodeposited Nanocomposite Zn-Ni/CeO_2 coatings

摘要

Zn-Ni coatings are widely used as sacrificial coatings in automotive applications. It becomes important to still improve their durability to limite the release of heavy metals towards the environment and increase their functional properties. Incorporation of ceria particles permits to enhance physico-chemical properties of the electrodeposited coatings, but the particles distribution through the coating thickness cannot be ensured by conventional dc electrodeposition process. The reverse pulse plating electrodeposition process was then used, leading to better dispersion of nanoparticles. Even if the impact of the particles on the corrosion resistance is not so obvious, the tribological resistance is strongly improved probably due to modification in the plastic deformation of the Zn-Ni matrix.