Crystallization-dependent transition of corrosion resistance of an Fe-based bulk metallic glass under hydrostatic pressures. (February 2021)

• Record Type: Journal Article
• Authors: Gan, Zhen; Zhang, Cheng; Zhang, Zhan-Rong; Chen, Zheng-Jie; Liu, Lin
• Is Part Of: Corrosion science. Volume 179(2021)
• Publication Date: 2021-02
• Subjects: Fe-based bulk metallic glass -- Crystallization -- Corrosion -- Hydrostatic pressure -- Deep-sea applications; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2020.109098
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: A crystallinity-dependent transition on corrosion resistance of an Fe36 Cr23 Mo18 C15 B6 Y2 BMG under various hydrostatic pressures was reported. When the crystallization volume fraction value is below a critical value of 30 %, the corrosion rate and passive film properties remain unchanged. When the crystallization fraction is higher than 30 %, the corrosion rate increases dramatically, and the passivation dynamics changes significantly. Below 30 %, the corrosion is dominated by passivation and metastable pitting. Above 30 %, the corrosion is controlled by the microgalvanic effect induced stable pitting due to the formation of a tri-phase percolated microstructure. 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 ( V f ) is below a critical value of 30 %, the corrosion resistance remains almost unaffected as that in the as-cast BMG; when the V f 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 V f was above 30 %, a tri-phase structure formed such that micro galvanic effect induced stable pitting starts to dominate the corrosion.