Severe corrosion behavior of Fe78Si9B13 glassy alloy under magnetic field

The corrosion behavior of Fe78Si9B13 glassy ribbons in 0.3 M NaCl + 0.06 M NaOH solution under magnetic field has been studied by immersion and electrochemical tests such as electrochemical impedance spectroscopy (EIS) technique and polarization scanning, and the corroded morphology and products of ribbons have been measured by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS). It is found that the added magnetic field induces a severe corrosion behavior of the Fe-based glassy ribbons despite being in immersion or electrochemical corrosion, reflecting in a larger corrosion rate and a lower pitting potential. In addition, the magnetic field can decrease the charge transfer resistance (R-t) in the equivalent circuit of the electrochemical reaction, can trigger the occurrence of filiform corrosion and cracks, and can hinder the formation of silicon dioxide on the sample surface. The severe electrochemical corrosion of Fe-based glass alloy under magnetic field is explained by the effects of magnetohydrodynamic (MHD). (C) 2014 Elsevier B.V. All rights reserved.