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The corrosion resistance of Fe24+xCo24−xCr15Mo14C15B6Y2 (x = 0, 2, 4, 6, 17) bulk amorphous alloys was investigated through electrochemical testing and neutral salt spray corrosion tests. The alloys exhibited a wide passivation region in 1 mol/L HCl, and their EIS spectra consisted of single capacitive loops, indicating good corrosion resistance. Analysis of polarization curves and AC impedance results showed that the corrosion resistance increased initially and then decreased with increasing Co content, peaking at a Co content of 20 at.% (x = 4). Energy dispersive spectroscopy (EDS) and atomic force microscopy (AFM) analysis of the neutral salt spray corrosion results indicated that the corrosion products mainly consisted of oxides and chlorides of iron and cobalt. The degree of corrosion of Fe–Co-based bulk amorphous alloys varied with Co content, with a similar trend observed in both salt spray and electrochemical corrosion tests.

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Electrochemical and Salt Spray Corrosion Studies of Fe–Co-Based Bulk Amorphous Alloys

  • 章节

  • 发表日期：

    2025年

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  • Q. J. Chen,
  • W. Jiang,
  • F. B. Zhang,
  • Y. H. Dong,
  • X. L. Zhou

摘要

The corrosion resistance of Fe24+xCo24−xCr15Mo14C15B6Y2 (x = 0, 2, 4, 6, 17) bulk amorphous alloys was investigated through electrochemical testing and neutral salt spray corrosion tests. The alloys exhibited a wide passivation region in 1 mol/L HCl, and their EIS spectra consisted of single capacitive loops, indicating good corrosion resistance. Analysis of polarization curves and AC impedance results showed that the corrosion resistance increased initially and then decreased with increasing Co content, peaking at a Co content of 20 at.% (x = 4). Energy dispersive spectroscopy (EDS) and atomic force microscopy (AFM) analysis of the neutral salt spray corrosion results indicated that the corrosion products mainly consisted of oxides and chlorides of iron and cobalt. The degree of corrosion of Fe–Co-based bulk amorphous alloys varied with Co content, with a similar trend observed in both salt spray and electrochemical corrosion tests.