Corrosion resistance of Fe77Mo5P9C7.5B1.5 metallic glass matrix composites

Corrosion resistance of (1) Fe77Mo5P9C7.5B1.5 glass matrix composite containing α-Fe dendrites and (2) AISI Type 301 stainless steel was assessed in deaerated 1 M HCl solution by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. Results showed that the excessive difference in composition between α-Fe dendrites and glass matrix induced a galvanic effect that causes preferential dissolution of α dendrites. However, no transpassive behavior was observed by anodic polarization up to 1000 mV for composite specimen. In contrast, the stainless steel revealed lower corrosion rate and passive current density. SEM micrographs were also used to confirm these findings.