Effect of Hydrogen on the Internal Oxidation of a Pd–Cr Alloy in Dual-Atmosphere Conditions

Abstract The effect of hydrogen on oxygen permeability has been studied in a diluted Pd–Cr alloy dual- and single- atmosphere conditions between 600 950 °C. 0.3 mm thick Pd–1.5Cr foil was exposed dry humid air as well dual-atmosphere conditions, with one sample surface being to hydrogen, encountered solid oxide fuel cells. At all temperatures, Cr oxidized internally forming internal oxidation zones which were measured metallographic cross sections. Below 800 °C, an external layer PdO formed the decreasing kinetics. No measurable Pd detected.