An electrochemical investigation of Fe₇₅B_25‐xSi_x amorphous alloys

Abstract

The glassy alloys of the family Fe7,B2,.,Si, exhibit a low corrosion resistance. Their corrosion rate decreases with increasing solution pH and they undergo the activetpassive transition only when pH attains 8.4. There is a minor effect of Si on the corrosion rate at the open circuit potential. However, remote from E,,, in acidic solutions Si enhances the active dissolution at anodic potentials and suppresses the hydrogen evolution. On the other hand the ability to passivate and the stability of the passive state increases distinctly with Si concentration.

Localized Corrosion of Fe‐B‐Si Glassy Alloys

“…Si, when substituted for B, in Fe-Ni-B or Fe-B glassy alloys enhances stability of the passive state. Enrichment of Si in the passivating film is responsible for this enhancement in Fe-Ni-B-Si alloys (11) and probably also in Fe base alloys (12,13).…”

“…Corrosion resistance of glassy alloys which do not contain any of the above mentioned film-forming elements is rather poor (8)(9)(10)(11)(12). It has been found, however, that Si may improve it (11)(12)(13).…”

“…Corrosion resistance of glassy alloys which do not contain any of the above mentioned film-forming elements is rather poor (8)(9)(10)(11)(12). It has been found, however, that Si may improve it (11)(12)(13). Si, when substituted for B, in Fe-Ni-B or Fe-B glassy alloys enhances stability of the passive state.…”