Quantitative galvanic corrosion data have been obtained for brass and bronze couples in flowing fresh water. Laboratory measurements of galvanic current flow between brass and bronze were made employing an automatic balancing zero impedance ammeter. The galvanic current data have been discussed with the polarization behavior of uncoupled brass and bronze determined by a separate experiment. Good agreement has been found between the dissolution current density and the rate of penetration of the brass in the couple determined by the weight-loss measurement. Furthermore, a correction has been made for the anodic current density of the brass with respect to the amount of beta brass phase, which has yielded a fair agreement between the anodic current density and the average depth of dezincification. The effect of flow rate on the galvanic current density is discussed with reference to the mass transfer treatment.