Improving the degradation efficiency for the azo dye of Fe82Si2.5B12P2.5C alloy via heat treatment

作者：Chen, J. W.; Ji, L.; Zheng, Z. G.^*; Liu, X.; Qiu, Z. G.; Zhou, S. H.; Huang, L.; Wei, J.; Zeng, D. C.^*

来源：Materials Letters, 2021, 300: 130187.

DOI：10.1016/j.matlet.2021.130187

• Grain boundaries
• Nanocrystalline materials
• Metals and alloys
• Amorphous materials
• Corrosion

Fe-based metallic glass has been reported to exhibit high degradation ability for azo dye due to its unique atomic structure. In this work, we show that the degradation efficiency of Fe-based alloy can be further improved via simple heat treatment. Fe82Si2.5B12P2.5C amorphous ribbons were prepared by arc melting and melt spinning and then annealed from 100 degrees C to 850 degrees C for 5 min. A crystallization process from single alpha-Fe at 500 degrees C, to alpha-Fe + Fe3B at 520 degrees C, to alpha-Fe + Fe3B + Fe2C at 850 degrees C, took place. The degradation efficiency of the heat-treated ribbons decreased monolithically when annealed at 100-600 degrees C, but increased dramatically at 850 degrees C. The underlying degradation mechanisms were analyzed, that the formation and interaction of nanocrystals after annealing were considered mainly responsible for the differences in their degradation performances.