Corrosion behaviour of Fe(73.5-x)Cu1Nb3Si13.5B9Mox(1-5) amorphous alloys

The electrochemical behaviour of Fe(73.5-X)CU1Nb3Si13.5B9MoX(1-5) amorphous alloys, has been studied using cyclic voltammetry in 0.5N KOH solution at room temperature. In order to clarify the role of Mo on the anodically formed oxide layers, voltammetric responses of the alloys in alkaline solutions were obtained. For the oxide growth, the optimal electrochemical variables (anodic and cathodic limits, and sweep rate) of each amorphous alloy were obtained. The electrochemical properties of these alloys are significantly influenced by very small structural differences, which can be detected by diffraction techniques. Amorphous alloys with a nonhomogeneous structure showed the highest voltammetric anodic charge. This anomalous electrochemical behaviour may also be shown in the potentiodynamic polarization curves as an increase of the current density peak at the active-passive transition, i(crit).