Chemical Reaction Between Ferroxyl Test Solution and Electrodeposited Nickel

Ferroxyl test has conventionally been adopted for testing electrodeposited nickel, but it is not always good method, because ferroxyl test solution disolves nickel. The mechanism of the ferroxyl test solution to dissolve plated nickel is not known. Therefore, many experiments to make the mechanism clear were carried out. Result: As shown in the following equations, K3Fe (CN)6 acts as an oxidizing agent and under the presence of NaCl, dissolves the plated nickel to form the ferrocyanide and ferricyanide. 2Fe(CN)6---→2Fe(CN)6== Ni →Ni++ The oxidizing action of K3Fe(CN)6 in this case is more vigorous than dissolved oxygen in the testing solution.