Correlation of Corrosion Resistance of Fe-based Amorphous Alloy with Multi-Components and Cluster Vibration Properties

In this paper, Fe-based amorphous alloys with excellent corrosion resistance and thermal stability were obtained by adjust the Fe/Cr ratio in the composition of Fe_57.47-xCr_11.84+xMo_10.09C_11.6B₇Y₂(x=0, 2, 4, 6). The correlation between the corrosion resistance of Fe-based amorphous alloy and the vibration performance of clusters was investigated by electrochemical method and Raman spectrometer, respectively. The results of electrochemical tests show that the corrosion resistance of Fe-based amorphous alloys in 3.5%NaCl solution increase first and then decrease and increase again with the increase of Fe/Cr ratio. The Raman spectroscopy test at room temperature shows that the vibration wavenumber of clusters in the amorphous alloy decrease first and then increase and decrease again with the increase of Fe/Cr ratio. The variation of the vibration wave number of the cluster changes the Gibbs free energy in the amorphous alloy, which changes the current density in the process of corrosion, and eventually leads to the change of the corrosion resistance of the amorphous alloy. The passivation current density of Fe-based amorphous alloys in 3.5% NaCl solution and vibration wavenumber of clusters is following as y=1.616 8+0.005 42e^(x)/235.2.