The galvanic currents between carbon steel and two types of stainless steels have been Studied in solutions of pH close to that of concrete. The situations analysed were passivity and active corrosion induced by chlorides. In all cases the galvanic effects recorded were of minor importance indicating that no significant risk of galvanic corrosion exists when carbon steel and stainless steel are electrically coupled in reinforced concrete structures. Oxygen reduction current is lower for stainless steel than for passive carbon steel. The results have been interpreted by means of EIS in terms of the resistivity of the passive layer formed on steels.