Abstract
The passivation and microstructure of Fe-based metallic glasses (MGs) with different contents of essential elements in 3.5 wt% NaCl solution were investigated by electrochemical techniques such as potentiodynamic polarization (PDP), potentiostatic polarization (PSP) and Mott-Schottky (MS) as well as surficial stability analysis including X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). At the low passive potential region, the strongly Cr-enriched passive film on Fe48Cr15Mo14C15B6Y2 (Cr15Mo14) generates a higher resistance than that of Fe63Cr8Mo3.5C4B4Ni5P10Si2.5 (Cr8Mo3.5) with a Fe-rich film. As the potential increases, the enhanced hydration, e.g., Cr2O3 converted to Cr(OH)3, causes a film degradation of Cr15Mo14, while the stable Si-oxide is increasingly enriched and maintains the high film protection of Cr8Mo3.5. Consequently, the corrosion resistance of Cr8Mo3.5 becomes better than that of Cr15Mo14 at the high passive potential region.
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