Crystallization-dependent transition of corrosion resistance of an Fe-based bulk metallic glass under hydrostatic pressures
Abstract:
We reported a crystallization-dependent transition of corrosion resistance of an Fe-based bulk metallic glass (BMG) under hydrostatic pressures. When the crystallized volume fracture (Vf) is below a critical value of 30%, the corrosion resistance remains almost unaffected as that in the as-cast BMG; when the Vf is higher than this critical value, the corrosion resistance decreases, and the passivation dynamics changes significantly. The underlying mechanism is understood by the competitions among the passivation, pitting kinetics, and micro galvanic effects. When Vf was above 30%, a tri-phase structure formed such that micro galvanic effect induced stable pitting starts to dominate the corrosion.
