Effect of chromium content and sweep rate on passive film growth on iron-chromium alloys studied by EQCM and XPS

摘要

Growth of passive films on Cr and Fe-Cr alloys with Cr concentrations ranging from 15 /100 to 54/100 was studied in situ with the electrochemical quartz crystal microbalance (EQCM). Mass change and current transient s were measured as the response to a potential change in The passive region form 0 to 800 mV(SHE) in a pH 1.5 sulfate electrolyte. From these Measurements, the thickness change as well as integral and differential growth fractions were Calculated. The growth fraction expresses the fraction of oxidized metal that remains in the Film.