Abstract
Abstract Potentiodynamic polarization studies on Vitrovac 0040 (Fe40Ni40B20), Metglas 2826 MB (Fe40Ni38Mo4B18) and Vitrovac 4040 (Fe39Ni39Mo4Si6 B12) commercial metallic glasses in 1 N Na2SO4 of varying pH and in 0.5 N H2SO4 have been performed. It is found that in alkaline and neutral sulfate solution, Mo and Si have a subtle effect in reducing icorr. Mo imparts passivation in neutral sulfate and fails to passivate the glass in H2SO4 solution. No perceptible change in icorr is found with the addition of Mo to the glass in H2SO4 solution. While Si increases the corrosion rate of the glass, it also promotes passivation in H2SO4. However, in the presence of chloride ions, the Si-containing glass is susceptible to pitting. Devitrification of Vitrovac 4040 leads to active dissolution irrespective of the crystalline products present, while the corrosion rate and electrochemical parameters depend on the nature of crystalline phases formed during the devitrification.
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