Evaluating corrosion resistances of Fe-based amorphous alloys by YCr/Mo values
来源期刊：Journal of Rare Earths2017年第4期
论文作者：夏怀效 陈庆军 王诚杰
文章页码：406 - 411
摘 要：In this paper, the synthetic effect of Cr, Mo and Y on corrosion resistance was explored, and the YCr/Mo value was employed to evaluate the corrosion resistance. The composition of amorphous alloy was designed by mixing the Fe41Co7Cr15Mo14C15B6Y2（BMG1） with good glass forming ability（GFA） and Fe50Cr22B23Ni5.4 with a high corrosion resistance at 9:1 ratio. At the same time, the contents of Y, Mo and Cr were fine-tuned. The electrochemical tests demonstrated that the passivation current density decreased with the increase of the YCr/Mo value. The passivation current density of Fe-based amorphous alloy was reduced by about half an order of magnitude. The fitting result showed that the logarithm of passivation current density（I） and the YCr/Mo value（X） were logarithmic relationship, and the fitting equation was I=–5.649+4.904×1015e–17.52x. The X-ray photoelectron spectroscopy（XPS） results showed that the YCr/Mo value played a key role in stability of passive films. When the YCr/Mo value was low, the Cr6+ ion, Mo6+ ion were enriched in the initial stage of passivation process, then leading to the increase passivation current density. However, when the YCr/Mo value was high, the low-valence Fe2+, Cr3+, and Mo4+ ion were enriched more easily, which result in small passivation current densities and more stable passive films.
夏怀效，陈庆军，王诚杰
School of Materials Science and Engineering,Nanchang Hangkong University
摘 要：In this paper, the synthetic effect of Cr, Mo and Y on corrosion resistance was explored, and the YCr/Mo value was employed to evaluate the corrosion resistance. The composition of amorphous alloy was designed by mixing the Fe41Co7Cr15Mo14C15B6Y2（BMG1） with good glass forming ability（GFA） and Fe50Cr22B23Ni5.4 with a high corrosion resistance at 9:1 ratio. At the same time, the contents of Y, Mo and Cr were fine-tuned. The electrochemical tests demonstrated that the passivation current density decreased with the increase of the YCr/Mo value. The passivation current density of Fe-based amorphous alloy was reduced by about half an order of magnitude. The fitting result showed that the logarithm of passivation current density（I） and the YCr/Mo value（X） were logarithmic relationship, and the fitting equation was I=–5.649+4.904×1015e–17.52x. The X-ray photoelectron spectroscopy（XPS） results showed that the YCr/Mo value played a key role in stability of passive films. When the YCr/Mo value was low, the Cr6+ ion, Mo6+ ion were enriched in the initial stage of passivation process, then leading to the increase passivation current density. However, when the YCr/Mo value was high, the low-valence Fe2+, Cr3+, and Mo4+ ion were enriched more easily, which result in small passivation current densities and more stable passive films.
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