The influence of gaseous hydrogen chloride (HCl) on powdered samples of iron (Fe), chromium (Gr) and several Fe-Cr binary alloys was studied in the laboratory by using a simultaneous TGA-DTA analyzer. Continuous and interrupted runs at 300-900 degrees C were accomplished both in oxidizing and reducing atmospheres. In interrupted runs, the samples were exposed to HCl only for a short time. in oxidizing conditions, HCl exposure caused rapid oxidation of ail the samples above 600 degrees C. In reducing conditions, the formation of iron and chromium chlorides was confirmed. In the interrupted runs with binary Fe-Cr alloys in oxidizing conditions, rapid oxidation continued after the HCl exposure, thus indicating that chlorine-induced corrosion has a memory effect. In reducing conditions, this memory effect was not observed.