Great effort has been devoted for the last two decades to the development of Fe-based BMGs and for the last three years successful preparation of alloys with high glass forming ability (critical diameter higher than 10mm) and interesting combination of properties were reported. An important aspect for the applicability of these alloys is their chemical stability in different aggressive media. In this study the (Fe_44.3Cr₅Co₅Mo_12.8Mn_11.2C_15.8B_5.9)_98.5Y_1.5 alloy was characterized from this perspective. Amorphous samples of this composition were obtained by copper-mould casting in an argon atmosphere and analyzed regarding their microstructure and thermal behaviour. Their anodization behaviour in aqueous environments with varying pH values was studied by electrochemical polarization techniques in combination with surface analytical investigations, i.e. HRSEM, EDX, AFM. For a more complete understanding electrochemical impedance spectroscopy was also used. The results are discussed in terms of chemical composition and structure influence on dissolution/passivation mechanisms and, more generally, on corrosion behaviour of these alloys.

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