About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Cutting-Edge Characterization and Electrochemical Techniques for Unraveling Corrosion Phenomena
|
| Presentation Title |
Evaluating Passive Film Properties of Fe-Based Metallic Glasses for Enhanced Corrosion Resistance |
| Author(s) |
Caio Martins, Guilherme Yuuki Koga, Virginie Roche, Alberto Moreira Jorge Jr., Walter José Botta |
| On-Site Speaker (Planned) |
Caio Martins |
| Abstract Scope |
This study investigates the electrochemical behavior of two Fe-based metallic glasses, Fe68.14Cr8.83Nb4.37Mo4.37B4.28C10 (M6C) and Fe59.63Cr7.73Nb3.83Mo3.83B7.5C17.5 (M3C), in chloride-rich environments. Due to amorphous structure, metallic glasses are promising for corrosion resistance. Both alloys showed excellent performance, with very low corrosion current densities (~10⁻⁸ A·cm⁻²), wide passivation ranges (M3C: 1.1 V; M6C: 1.08 V), and no pitting. Electrochemical impedance spectroscopy (EIS) confirmed high impedance values (~10⁶ Ω·cm²) and capacitive behavior. M3C exhibited superior protection, with a steeper Nyquist slope and stable phase angle. To analyze passive film characteristics, impedance spectra were simulated using SIMAD software and interpreted through the power law model to obtain the oxide layer resistivity profile. Both alloys formed compact, stable passive layers, with M3C showing the highest resistivity at the metal/oxide interface (~10¹² Ω·cm). These findings highlight the beneficial effects of carbon and boron on passivation and structural integrity, while suggesting excess chromium may not improve corrosion performance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |