Effects of novel additives for zinc-nickel alloy plating

Abstract

The development of alternative coating material is important for the corrosion life of metals. Improving the corrosion resistance and decorative appearance of zinc-nickel coatings is gaining importance. Related physical properties can be provided by using various chemicals. Tetraethylamine, triethanolamine, gelatin, and p-aminobenzenesulfonic are the chemicals used in this study to evaluate corrosion resistance and decorative appearance.

Concentration Influence of Complexing Agent on Electrodeposited Zn-Ni Alloy

“…Notably, a TEPA concentration of 0.1 M could increase the Ni content by up to 20%, which is a high amount compared to previous studies [34]. The increase in Ni content owing to TEPA can be explained by the fact that TEPA acts as a complexing agent that binds with Ni ions to prevent the precipitation of Ni hydroxide, thereby enhancing the deposition of metallic Ni on the cathode surface [27,28,34]. Electroplating allows creating a multi-component alloy coating at low temperatures.…”

“…For example, the thickness of Zn-Ni coating was 11, 10.5, 9.8, and 9 µm with 0, 0.035, 0.07, and 0.1 M, respectively. This was caused by the increase in TEPA concentration diminishing the diffusion rate of metal ions, thereby reducing the thickness [28]. For current densities lower than 2 ASD, most thickness values were identical, except for those with 0 M of TEPA concentration, which were lower than the others.…”

“…Previous research has mostly focused on factors that increase the Ni content since a higher amount of Ni leads to better corrosion resistance of coatings [25,26]. One effective approach is the addition of complexing agents in the plating solution [27,28]. The interaction between metallic ions and complexing agents that contain ions or functional groups can result in the formation of a complex.…”