Co-deposition of hydrogen

The co-deposition of hydrogen in electroplating is a process that can occur in electrochemical coating processes. During electroplating, a frequently used process in surface technology, metals are deposited on a substrate by electrolytic deposition. Hydrogen can be generated as a by-product and embedded in the deposited metal layer.

The co-deposition of hydrogen in electroplating processes is often due to the reduction of hydrogen ions (H⁺) in the cathode area during electrolysis. The hydrogen is integrated into the metal coating, especially if the conditions for gas evolution at the cathode are favorable. This hydrogen can be trapped in the pores of the coating, which can lead to different effects.

However, the co-deposition of hydrogen in electroplated coatings can be problematic. Particularly with certain metals, hydrogen can penetrate the lattice and lead to brittle behavior or cracking, which can affect the mechanical properties of the coating. This is known as hydrogen embrittlement and requires careful control of process parameters to minimize it.

Various measures are taken to reduce undesirable effects caused by the co-deposition of hydrogen. This can include optimization of electrolyte composition, temperature control and current density during the electroplating process. The selection of suitable plating parameters and the application of post-treatments are crucial to ensure the quality of the electrodeposited layers and to minimize undesirable effects due to the co-deposition of hydrogen.