Anodic behaviors of Pd-Zn alloys in hydrochloric acid have been observed by channel flow double electrode to examine dissolution of Pd enhanced by alloying. The measurements on Pd - 40%Zn, Pd - 60%Zn and Pd - 78%Zn show that the enhancement of Pd dissolution depends strongly on the alloy compositions. A linear sweep voltammogram with a Pd - 78%Zn electrode indicates that Pd dissolved from the alloy at unusually low potentials, and this might be explained by a dissolution of unstable Pd clusters transiently formed through preferential dissolution of Zn. On the other hand, potentiostatic measurements show that Pd dissolves from Pd - 60%Zn at a higher rate than from the two other alloys. Dissolution characteristics of the alloys are discussed by considering their potential dependency and the morphological changes of the dissolving surface. (C) 2014 Elsevier Ltd. All rights reserved.