CATHODIC TREATMENT OF THE SURFACE OF IRON-BASED METAL-GLASS BAND IN SULFURIC ELECTROLYTE

The effect of heat treatment of the alloy 78Fe-1Cu-3.5Nb-13.5Si-4B on its corrosion-electrochemical characteristics in 0.5 M sulfuric acid s olution, i.e., the potential dependence of the dissolution rate, criti cal passivation current, passive dissolution rate, and reaction order in hydrogen ions, were investigated electrochemically. The structure a nd morphology of the alloy were examined with optical and electronic m icroscopies and x-ray analysis. The hydrogen overpotential and corrosi on rate were found to drop abruptly on transition from amorphous to fi ne-grained structure. An attempt to explain the results was made. The results are considered within the soliton theory.