Influence of Cr on the interfacial boride reaction between Fe-Cr-B cast steel and molten aluminium. (September 2019)

• Record Type: Journal Article
• Authors: Zhang, Xianman; Chen, Weiping; Luo, Hongfeng; Ling, Zicheng; Wang, Juan; Zhou, Teng; Li, Shuang
• Is Part Of: Corrosion science. Volume 158(2019)
• Publication Date: 2019-09
• Subjects: Periodic layered structure -- Interfacial reaction -- Boride -- Critical chromium range -- Molten aluminium; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.108098
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: The M2 B phase that could form PLSs was (Cr, Fe)2 B. Only when the content of Cr in Fe-Cr-B cast steel was within a critical range could the PSLs be formed. At the early stage, the alternated layer phases in PLS were not formed simultaneously. Abstract: The influence of the Cr content of Fe–Cr–B cast steel on the interfacial reaction between M2 B-type (M = Fe, Cr) boride and molten aluminium was studied. Different types of the M2 B phases behaved differently in molten aluminium, with (Cr, Fe)2 B forming periodic layered structures (PLSs), which improves the corrosion resistance of the steel. In particular, it is shown that alternating-layer phases in a PLS are not formed initially. Instead the preferential leaching of Fe atoms from (Cr, Fe)2 B, accompanied by the inward diffusion of Al atoms, resulted in the initial formation of a single-phase layer of the Cr–B–Al phase.