Electrochemical behaviour of Fe40Ni38Mo4B18 amorphous alloys in aqueous solution at high pH. Influence of the structural relaxation

摘要

Electrochemical properties of Fe40Ni38Mo4B18 metallic glass in aqueous KOH solution, both as-quenched and relaxated, have been studied. The relaxation was induced by thermal treatment at 100 degrees C, 200 degrees C, 300 degrees C, and 350 degrees C for 30, 60 and 120 min. The results obtained show that the electrochemical properties of the samples relaxed at 200 degrees C, 300 degrees C and 350 degrees C can be connected with short range ordering and with migration diffusion phenomenon of metalloid atoms. The structural changes of the samples produced at high temperatures, differ from those observed by techniques of bulk measurements and, therefore, mechanisms related to the surface properties may be inferred. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 8]