The Effect of Electrodeposition Current Density on Corrosion Behaviour and Microstructure of Nanostructured Ni Coating Electrodeposited from Deep Eutectic Solvent Containing Residual Water on Medium Carbon Steel
MetadataShow full item record
Environmentally friendly choline chloride/ethylene glycol-based deep eutectic solvent containing 0.2 M NiCl 2 •6H 2 O was employed to produce Ni coatings through pulse electrodeposition at different current densities of 2-30 mA cm -2 on AISI 1045 medium carbon steel. The effect of the current density on the microstructure, surface texture, and consequently and corrosion properties were studied. Granular growth-pattern covered by nano-sized platelets were developed on the surface at electrodeposition current densities of 2-16 mA cm -2 . Formation of NiO and Ni(OH) 2 along with metallic Ni was detected at the surface of the coating using X-ray photoelectron spectroscopy. Dominating factors, controlling corrosion mechanism, such as compactness, composition, layer thickness, and permittivity, as well as surface texture varied with the range of electrodeposition current density from 2-4 mA cm -2 to 8-16 mA cm -2 . Corrosion mechanism changed from localized to general by increasing the electrodeposition current density from 4 to 8 mA cm -2 . Removing the Ni surface texture for coatings prepared at 8 mA cm -2 , resulted in localized corrosion, namely pitting corrosion showing that the roughness developed during the electrodeposition from the DES is beneficial to corrosion protection.
The following license files are associated with this item: