ELECTROCHEMICAL-BEHAVIOR OF FE40NI38MO4B18 AMORPHOUS-ALLOYS IN AQUEOUS-SOLUTION AT HIGH PH - INFLUENCE OF THE STRUCTURAL RELAXATION

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 degr ees C, 300 degrees C, and 350 degrees C for 30, 60 and 120 min. The re sults obtained show that the electrochemical properties of the samples relaxed at 200 degrees C, 300 degrees C and 350 degrees C can be conn ected with short range ordering and with migration diffusion phenomeno n of metalloid atoms. The structural changes of the samples produced a t high temperatures, differ from those observed by techniques of bulk measurements and, therefore, mechanisms related to the surface propert ies may be inferred. (C) 1998 Elsevier Science B.V. All rights reserve d.