Abstract
The phase structure, magnetic properties and corrosion resistance in the as-spun and annealed (Fe0.7Co0.15Ni0.15)75B21Nb4 metallic glasses (MGs) were investigated. Annealing below glass transition temperature at 693 K causes a reduction in coercivity and ameliorates the soft magnetic properties, originating from the formation of a homogeneous glassy structure. The hysteresis loops of the as-annealed ribbons, especially the 888 K-annealed one, appear to be more rectangular in their geometry, showing that the approach to saturation becomes more expeditious. The synergy of amorphous phase and nano-size magnetic α-Fe(Co) phase in the 753 K-annealed ribbon leads the improvement of saturation magnetization. The corrosion behaviors in seawater solution have been investigated by electrochemical polarization measurement. By evaluating the corrosion potential and current density, annealing treatment induces the detrimental influence in the general corrosion resistance of MG ribbons. However, compared with as-spun amorphous state, the 693 K-annealed relaxation ribbon exhibits superior passivity with lower passive current density and higher pitting resistance as revealed by wider passive region.
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