Fe基非晶及纳米晶在硫酸中的腐蚀研究

Electrochemical Corrosion Behavior of Amorphous and Nanocrystalline Fe-based Alloys in H2SO4 Solution

摘要:

利用电化学极化曲线的方法和电化学阻抗技术,研究非晶Fe78Si13B9和纳米晶Fe73.5Si13.5B9Nb3Cu1合金在1 mol·L-1的H2SO4溶液里的电化学腐蚀行为；利用X射线衍射仪和示差扫描量热计(DSC),研究该非晶薄带的非晶特性及晶化过程；用扫描电镜观察极化测试后的试样形貌；还研究不同的热处理温度对材料的结构及在1 mol·L-1的H2SO4溶液里耐腐蚀性能的影响.结果表明，纳米晶比非晶合金的耐腐蚀性能要好；随着热处理温度的升高，非晶的耐腐蚀性能得到提高,而纳米晶则降低.

Abstract:

A comparative study of the electrochemical corrosion behavior of Fe78Si13B9 and Fe73.5Si13.5B9Nb3Cu1 amorphous and nanocrystallized alloys was performed with linear polarization method and electrochemical impedance spectroscopy in 1 mol·L-1 H2SO4 solutions.The amorphous ribbons and their crystallization processes were identified by differential scanning calorimeter (DSC) and X-ray diffraction (XRD).The photographs of the samples after potentiodynamic polarization were observed by scanning electron microscope (SEM).The influence of heat treatment on the alloy structure and corrosion resistance in 1 mol·L-1 H2SO4 solutions was investigated.The results show that nanocrystalline alloys have a higher corrosion resistance than amorphous talloys，and the corrosion resistance of amorphous alloys increases as thermal treatment temperature rises with nanocrystallized decreasing.