For the copper plating of steel parts, the alkaline copper electrolyte should be chosen. When using an acidic copper electrolyte, electroless deposition of copper on the steel can occur. This uncontrolled chemical reaction leads to a coarse-grained copper layer with poor adhesion, which impairs the quality of the coating.

The alkaline electrolyte allows for controlled, electrolytic deposition of copper, resulting in an even and firmly adhering layer. However, alkaline electrolytes unfortunately do not deposit with a shiny finish, so often an additional acidic copper plating with a bright copper electrolyte is performed afterwards to achieve a shiny, decorative surface. Therefore, it is common practice to first use the alkaline copper electrolyte on steel components for good adhesion and then an acidic copper electrolyte for the shiny finish.