Fe基非晶和纳米晶合金晶化及电化学腐蚀行为  

Crystallization and Electrochemical Corrosion Behaviors of Amorphous and Nanocrystalline Fe-Based Alloys

作　　者：李翔[1] 严彪[1] 董鹏[1] 

机构地区：[1]同济大学材料科学与工程学院上海市金属功能材料开发应用重点实验室,上海200092

出　　处：《电化学》2009年第3期269-274,共6页Journal of Electrochemistry

基　　金：上海市科委科技基金(No.0752nm004)资助

摘　　要：应用单辊甩带法制备非晶态Fe78Si13B9和Fe73.5Si13.5B9Nb3Cu1薄带,并以非晶晶化退火法制备出纳米晶Fe73.5Si13.5B9Nb3Cu1薄带.利用X射线衍射(XRD)仪和示差扫描量热计(DSC)对该非晶薄带的非晶特性及其晶化过程进行了研究.并用电化学极化曲线的方法和电化学阻抗技术研究了非晶态Fe78Si13B9和纳米晶Fe73.5Si13.5B9Nb3Cu1合金在1mol/LNaOH溶液里的电化学腐蚀行为,用SEM对极化测试后的试样形貌进行了观察;同时还研究了不同的热处理温度对材料结构及在1mol/LNaOH溶液里耐腐蚀性能的影响.结果表明,该非晶薄带的晶化过程分为两步;纳米晶比非晶合金的耐腐蚀性要好;且随着热处理温度的升高,非晶和纳米晶的耐腐蚀性能都得到提高.In this study, amorphous Fe78Si13B9 and Fe78.5Si13.5B9Nb3Cu1 ribbons were prepared by the chill block melt-spinning process and nanocrystalline Fe78.5Si13.5B9Nb3Cu1 ribbons were obtained by annealing. The a-morphous ribbons and their crystallization processes were identified by differential scanning calorimeter （DSC） and X-ray diffraction （XRD）. A comparative study of the electrochemical corrosion behaviors of Fe78Si13B9 and Fe78.5Si13.5B9Nb3Cu1 amorphous and nanocrystallized alloys was performed by linear polarization method and electrochemical impedance spectroscopy （EIS） in 1mol/L NaOH solutions. The photographs of the samples after potentiodynamic polarization were observed by SEM. The influence of heat treatment on the alloys structure and corrosion resistance in 1mol/L NaOH solutions was investigated. The results show that the crystallization of amorphous ribbons occurs in two steps, nanocrystalline alloys have a higher corrosion resistance than amorphous alloys, and the corrosion resistances of amorphous and nanoerystalline alloys increase as thermal treatment temper-ature rises.

关 键 词：非晶 纳米晶 晶化行为 耐腐蚀性能 扩散通道 

分 类 号：TG139.8[一般工业技术—材料科学与工程]