In conclusion, during the electrolysis of nickel from acid sulphate solutions, the coverage of the cathode by a possible colloidal film of nickel hydroxide is the decisive factor. In its presence, the cathode exhibits a very fine-grained, randomly oriented structure. If the film is removed, the structure consists at these current densities of relatively large grains with a very strong texture  perpendicular to cathode. The large grains are often twinned, but no individual stacking faults are found.
The inhibitive action of the hydroxide film can be eliminated by chloride ions , or it can be replaced by an organic additive .