Corrosion behaviour of Cr-Mn-(Ni-free) austenitic steels in an acidic media

In this study، four Cr-Mn- (Ni-free) austenitic steels were fabricated by vacuum induction furnace. Then plates with 10 mm thickness were fabricated by hot-rolling. Metallography observations have shown that these steels hasve a single γ-phase structure. The Corrosion behaviour of these steels in 0. 01 M H2SO4 solution was investigated using by open-circuit potential، potentiodynamic polarization، and electrochemical impedance spectroscopy (EIS). The results indicated that the open-circuit potentials of the four Cr-Mn austenitic steels were found to shift towards positive direction. Also، the potentiodynamic polarization curves suggested that the four Cr-Mn austenitic steels showed excellent passive behaviour.