In this paper, the synthetic effect ofCr, 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 mixin...In this paper, the synthetic effect ofCr, 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 ofpassivation current density （I） and the YCr/Mo value （X） were logarithmic relationship, and the fitting equation was I=-5.649＋4.904× 1015 e 17.52x. The X-ray photoelectron spectroscopy （XPS） results showed that the yC,/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.展开更多
基金Project supported by the National Natural Science Foundation of China(51261021)Science and Technology Landing Plan Project of Jiangxi Province(KJLD13056)
文摘In this paper, the synthetic effect ofCr, 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 ofpassivation current density （I） and the YCr/Mo value （X） were logarithmic relationship, and the fitting equation was I=-5.649＋4.904× 1015 e 17.52x. The X-ray photoelectron spectroscopy （XPS） results showed that the yC,/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.
