Influence of Thermal Treatment on Microstructure and Corrosion Behavior of Amorphous Fe 40 Ni 40 B 12 Si 8 Alloy

Microstructural evolution of thermally treated melt-quenched amorphous Fe 40 Ni 40 B 12 Si 8 alloy was studied in terms of its influence on corrosion behavior of the alloy. Alloy structure was transformed gradually from purely amorphous and chemically homogeneous to fully crystalline, yielding γ -(Fe,Ni), Ni 31 Si 12 and (Fe,Ni) 2 B phases as the final products. Corrosion study of the alloy in amorphous, partially crystalline as well as fully crystalline form, performed by electrochemical measurements in 0.5 M NaCl, together with the morphology examination, revealed that the microstructure and phase composition are crucial factors determining the corrosion resistance of the alloy in corrosive environment.