Metallic glasses (MGs) based on the Fe-Ni-B system are promising materials regarding the requirements of various industrial applications. The surface structure and composition of ribbons of isoatomic Fe-Ni with varying percentages of B, was investigated by X-Ray Diffraction (XRD), Auger Electron Spectroscopy (AES) and Energy Dispersive X-Ray Spectroscopy (EDS). The resistance of Fe-Ni-B MGs in general and localised corrosion, in various aqueous corrosive environments (3.5% NaCl, 1N HCl, 1N NaOH, 7N NaOH, d. NaOH, 1N HNO₃, 7N HNO₃, d. HNO₃, 1N H₂SO₄), at ambient temperatures, was electrochemically studied. A three electrode corrosion cell (reference electrode: Ag/AgCl (3.5 KCl), counter electrode: Pt) was employed and cyclic potentiodynamic polarization tests were performed.

The surface of the MGs (prior to corrosion testing) was found to be Fe enriched, whereas exposure to 200 eV N⁺ and Ar⁺ plasma slightly modified the top surface layer possibly inducing localized crystallization. The nanostructured alloys presented very low uniform corrosion rates in 3.5% NaCl, low corrosion rates in 1N NaOH and very high corrosion rates in 1N HNO₃ and 7N HNO_3. They showed a strong passive-pseudopassive behaviour in 1N NaOH, 7N NaOH, d. NaOH, d. HNO₃, and 1N H₂SO₄, whereas they were not found susceptible to pit corrosion. The Fe-Ni-B glasses were not susceptible to pitting in the 3.5% NaCl solution but they yielded localized corrosion when exposed to 1N HCl. The experiments indicated that B has a positive role on the corrosion resistance of the MGs.

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