Crystallization and electrochemical corrosion behaviors of amorphous and nanocrystalline Fe-based alloys

2010 3rd International Nanoelectronics Conference (INEC) Pub Date : 2010-03-04 DOI:10.1109/INEC.2010.5425104

Xiang Li, Yuxin Wang, Chunfeng Du, Chenkui Li, B. Yan

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引用次数: 2

Abstract

Amorphous Fe73.5Si13.5B9Nb3Cu1 alloy was prepared by the chill block melt-spinning process and nanocrystalline alloy was obtained by annealing. The crystallization behavior was analysed by DSC, XRD and TEM. The electrochemical corrosion behaviors in different annealed states were performed by linear polarization method and electrochemical impedance spectroscopy in 1mol/L HCl solution. The results show that the crystallization of amorphous alloy occurs in the two steps. Some nanometer crystals appear when annealing in 550°C and 600°C, respectively with grain size 13nm and 15nm. The nanocrystalline alloy has higher corrosion potential and lower anodic current density than amorphous alloy. It indicates that nanocrystalline alloy has a higher corrosion resistance. Amorphous and nanocrystalline Fe73.5Si13.5B9Nb3Cu1 alloys both consisted of only single semi-circle. The charge transfer reaction resistances increases as annealing temperature rises.

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非晶和纳米晶铁基合金的结晶和电化学腐蚀行为

采用冷块熔融纺丝法制备了Fe73.5Si13.5B9Nb3Cu1非晶态合金，退火后得到了纳米晶合金。采用DSC、XRD和TEM分析了结晶行为。在1mol/L HCl溶液中，采用线性极化法和电化学阻抗谱研究了不同退火状态下的电化学腐蚀行为。结果表明，非晶合金的结晶过程分为两个阶段。在550℃和600℃退火时，出现纳米级晶体，晶粒尺寸分别为13nm和15nm。纳米晶合金比非晶合金具有更高的腐蚀电位和更低的阳极电流密度。表明纳米晶合金具有较高的耐蚀性。非晶和纳米晶Fe73.5Si13.5B9Nb3Cu1合金均由单个半圆组成。电荷转移反应电阻随退火温度的升高而增大。

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2010 3rd International Nanoelectronics Conference (INEC)

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