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Copper and nickel in acidic metal baths

Multilayer systems are widespread in corrosion protection. For example, corrosion-inhibiting nickel is applied on top of an intermediate layer of copper.

In the deposition processes the concentration of the metal being deposited is an important parameter for the electric current to be applied. If the concentrations are too low, a stronger current has to be applied, which can drive up the production costs significantly. 

The copper content in acidic copper baths is determined by redox titration with c(Na2S2O3) = 0.1 mol/L, following prior reduction of Cu(II) to Cu(I) by means of potassium iodide. The nickel content is determined by way of complexometric titration with c(Na2EDTA) = 0.1 mol/L.