Effects of Cr addition on the glass‐forming ability and the corrosion behaviors of FeCBSiP amorphous alloys

Abstract

AbstractThe corrosion behaviors of Fe83‐XC1B11Si2P3CrX (X = 0, 1, 2, and 3 at%) amorphous alloys in 0.1 M NaCl solution have been investigated by immersion and electrochemical tests. With the addition of Cr content from 0 to 3 at%, the corrosion rate of amorphous alloys gradually decreases from 2.57 × 10−1 to 1.04 × 10−1 mm·year−1. The minor addition of Cr improves the corrosion resistance through the increase in the Ecorr value, which makes it easy to reach a passive state and suppress pitting corrosion. The corroded morphology and products of amorphous alloys have been tested by scanning electron microscopy (SEM) and energy‐dispersive spectroscopy (EDS). The SEM/EDS analysis shows that the high corrosion resistance is due to the formation of dense and stable chromium oxide during immersion in NaCl solutions.