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Corrosion resistance of Fe77Mo5P9C7.5B1.5 in-situ metallic glass matrix composites
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DOI：10.1016/j.jallcom.2017.11.138.png)
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Abstract
En 中文
A novel in-situ Fe-based metallic glass matrix composite with a composition of Fe77Mo5P9C7.5B1.5 was developed by injection casting. Scanning electron microscopy (SEM) and X-Ray diffraction (XRD) confirmed the presence of alpha-Fe dendrites as a secondary phase across the glassy matrix. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods were utilized to study the corrosion behavior of Fe77Mo5P9C7.5B1.5 in deaerated 1 M HCl solution and to compare it with that obtained for AISI Type 301 stainless steel as a Fe-base crystalline alloy. The electrochemical characterizations showed the lower corrosion resistance of the synthesized Fe-MGMC which was due to the galvanic cells formed between a-Fe dendrites and the glassy matrix. Energy dispersive spectroscopy (EDS) analysis of the corroded Fe-MGMC revealed the role of B and C in forming a passive layer mirrored by a stable vertical line in the anodic part of the corresponding potentiodynamic polarization curve. Although, the stainless steel sample yielded a lower corrosion rate and a higher charge transfer resistance, a passive-transpassive transition was observed in its anodic polarization curve confirming the lower stability of the passive film formed on the specimen. The preferential dissolution of a-Fe dendrites and formation of micro-sized pits were the characteristic corroded surface morphology of Fe77Mo5P9C7.5B1.5 and AISI Type 301 stainless steel, respectively. (C) 2017 Elsevier B.V. All rights reserved.
Keywords:
Metallic glass matrix composite
Corrosion
Casting
Microstructure
Electrochemical impedance spectroscopy
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