Electrochemical Corrosion Behavior of Amorphous and Nanocrystalline Fe-based Alloys in H2SO4 Solution

Abstract:

A comparative study of the electrochemical corrosion behavior of Fe78Si13B9 and Fe73.5Si13.5B9Nb3Cu1 amorphous and nanocrystallized alloys was performed with linear polarization method and electrochemical impedance spectroscopy in 1 mol·L-1 H2SO4 solutions.The amorphous ribbons and their crystallization processes were identified by differential scanning calorimeter (DSC) and X-ray diffraction (XRD).The photographs of the samples after potentiodynamic polarization were observed by scanning electron microscope (SEM).The influence of heat treatment on the alloy structure and corrosion resistance in 1 mol·L-1 H2SO4 solutions was investigated.The results show that nanocrystalline alloys have a higher corrosion resistance than amorphous talloys，and the corrosion resistance of amorphous alloys increases as thermal treatment temperature rises with nanocrystallized decreasing.