Evaluation of corrosion behavior on Mn-Cr austenitic steels using 0.1 M HCl solution

One of the attractive low activation steels is the austenitic mn-cr steel from the view point of waste disposal because of few long-lived nuclides. in this paper, three types of mn-cr austenitic steels were fabricated by vacuum induction furnace. then plates with 10 mm thickness were fabricated by hot-rolling. the physical metallurgy of these steels was studied by the corrected schaeffler diagram, x-ray and electron diffraction patterns. the corrected schaeffler diagram and x-ray diffraction (xrd) results have shown that the matrix of these steels is a single ?-phase structure. also, the corrosion behaviour in 0.1m hcl solution was evaluated by open-circuit potential, tafel polarization, and electrochemical impedance spectroscopy (eis). the results of tafel polarization experiments show corrosion current density of all three cr-mn steels is in the range of 10-4 a cm-2 which indicates their appropriate resistance in this acidic environment. the nyquist plots showed that polarization resistance from the first to third cr-mn steels decreases. this trend is due to increase in corrosion current density which corresponds to tafel polarization curves.