Duplex corrosion mechanisms correlated to α/γ phase selection in containerlessly processed Fe-Cr-Ni-Mo alloy

Li, L.Y.; Sun, C.H.; Ruan, Ying; Wei, B.

doi:10.1016/j.corsci.2023.111311

Cited by 2 publications

(1 citation statement)

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“…In the known stainless steels, Cr is one of the important and cheap elements to improve the corrosion resistance of the alloys [8]. Adding Cr can improve the corrosion/wear resistance of Fe-based amorphous alloys drastically [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Role of Cr Element in Highly Dense Passivation of Fe-Based Amorphous Alloy

Song,

Wang,

Chen

et al. 2023

Materials

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The effect of the Cr element on the corrosion behavior of as-spun Fe72−xCrxB19.2Si4.8Nb4 ribbons with x = 0, 7.2, 21.6, and 36 in 3.5% NaCl solution were investigated in this work. The results show that the glass formability of the alloys can be increased as Cr content (cCr) is added up to 21.6 at.%. When cCr reaches 36 at.%, some nanocrystals appear in the as-spun ribbon. With increasing cCr content, the corrosion resistances of as-spun Fe-based ribbons are continually improved as well as their hardness properties; during the polarization test, their passive film shows an increase first and then a decrease, with the highest pitting potential as cCr = 7.2 at.%, which is confirmed by an XPS test. The dense passivation film, composed of Cr2O3 and [CrOx(OH)3−2x, nH2O], can reduce the number of corrosion pits on the sample surface due to chloride corrosion and possibly be deteriorated by the overdosed CrFeB phase. This work can help us to design and prepare the highly corrosion-resistant Fe-based alloys.

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