Abstract
The effect of H2SO4 acid concentration in range (1.0-12.0) M on corrosion resistance and ability of passive film formation on metallic glassy Fe68.6Ni28.2Mn3.2 (at %) alloy have been studied using AC and DC techniques at 30°C. The experimental data obtained from this methods revealed that corrosion resistance increases at concentration higher than 6.0M. The alloy is spontaneously passivated with high passive current densities in all studied concentrations. Localized corrosion effects were observed at 12.0M. XPS analysis indicate the formation of NiS film on the alloy, which be responsible for the corrosion resistance of iron - base alloy. The fundamental thermodynamic functions were determined and used to glean important information about corrosion and passive characterization .