Analysis of anticorrosive behavior of Ni-Nb binary eutectic metallic glasses in a basic medium using electrochemical techniques
Keywords:
Corrosion, Melt Spinner, Ni-Nb, Passivation, Metallic glasses.Abstract
Metallic glasses have emerged as innovative materials in the manufacture of everyday electronic devices such as mobile phones, smartwatches, memory cards, and hard drives. Due to these applications, they are frequently exposed to alkaline pH substances in products such as soaps, lotions, and creams, posing challenges in terms of chemical stability and corrosion resistance. An electrochemical corrosion study was therefore carried out on Ni-Nb binary metallic glasses with eutectic composition (Ni₅₉.₅ Nb₄₀.₅) in 1M NaOH. The synthesis method was with fast solidification by Melt Spinner, three tape thicknesses obtained by varying the wheel spinning speed (6, 12 and 25 m/s) were studied. The structure of the ribbons was characterized by X-ray diffraction (XRD) to corroborate the vitrification. The electrochemical techniques used to evaluate the anticorrosive behavior of the metallic glasses were: Electrochemical impedance spectroscopy (EIS) and cyclic polarization curves (CPC). The XRD results revealed that the vitrification of the material is maintained in the different thickness worked. The Electrochemical tests in alkaline medium indicated that the thickest sample exhibited the highest corrosion potential (Ecorr) and the lowest corrosion rate. Additionally, the CPC results a pseudo-passivation behavior was observed at 10⁻³ mA/cm². Upon potential reversal, a negative hysteresis was observed, which has been reported in the literature as indicative of immunity to localized corrosion. These findings suggest that Ni-Nb metallic glasses demonstrate high corrosion resistance in alkaline environments, reinforcing their potential for applications in electronic devices exposed to aggressive conditions.
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