For the sake of the hydrogen electrochemical permeation method, the possibility to obtain a thin and reliable palladium coating on iron has been studied. Experiments were carried out at room temperature with a PdCl2 solution. Electrochemical kinetic measurements were done to find out the potential range in which the only possible reaction is the palladium reduction. A well adherent palladium coating, covering homogeneously the whole iron surface and thinner than 0.1 mu m, has been obtained.