CORROSION RESISTANCE OF TWO MAGNETIC METALLIC GLASSES IN ACIDIC AND NEUTRAL AQUEOUS SOLUTIONS.

Abstract

The corrosion resistance of two magnetic metallic glasses, viz. Fe//4//0Ni//4//0B//2//0 and Fe//3//9Ni//3//9Mo//2 (SiB)//2//0 was evaluated in H//2SO//4 and NaCl solutions by weight loss measurement and electrochemical techniques. In exposures up to six days the corrosion rate of Fe//4//0Ni//4//0B//2//0 was about 5 mpy while Fe//3//0Ni//3//9Mo//2 (SiB)//2//0 corroded about two times faster in 0. 1 M H//2SO//4 solution. In 3. 5% NaCl both alloys corroded at about the same rate, nearly 2 mpy. In potentiostatic polarization measurements the Mo bearing alloy passivated in the potential range plus 0. 45 V to plus 1. 45 V with respect to saturated calomel electrode in H//2SO//4 solutions of concentration 0. 001 M to 0. 1 M, but both alloys failed to passivate in NaCl solutions.