Applied Sciences, Vol. 13, Pages 7887: Concentration Influence of Complexing Agent on Electrodeposited Zn-Ni Alloy

Applied Sciences, Vol. 13, Pages 7887: Concentration Influence of Complexing Agent on Electrodeposited Zn-Ni Alloy

Applied Sciences doi: 10.3390/app13137887

Authors: Byung-Ki Son Ji-Won Choi Su-Byung Jeon In-Joon Son

Zinc (Zn) coatings, which are widely used to protect metals from corrosion, can be further improved by alloying with nickel (Ni). Increasing the Ni content enhances the corrosion-resistant properties of the Zn coating. This study investigated the effect of tetraethylenepentamine (TEPA) concentration on the Ni content and the properties of the Zn-Ni alloy coating. Zn-Ni alloy coatings were electrodeposited via the Hull cell test with TEPA concentrations of 0, 0.035, 0.07, and 0.1 M. We found that increasing the TEPA concentration improved the brightness of the coating at low current density and influenced the crystal orientation and morphology. When the TEPA concentration was increased to 0.7 M, the Ni content of the Zn-Ni alloy coating significantly increased before leveling off. However, the thickness of the coatings decreased with increasing TEPA concentration. The electrochemical behavior of the Zn-Ni alloy electrodeposition was validated via partial polarization curves of the Zn and Ni depositions.