(同濟大學(xué) 材料科學(xué)與工程學(xué)院 上海市金屬功能材料開發(fā)應(yīng)用重點實驗室，上海 200092)
摘 要: 采用單輥甩帶法制備出完全非晶態(tài)的Fe78Si13B9和Fe73.5Si13.5B9Nb3Cu1薄帶，并利用非晶晶化退火法制備非晶和納米晶雙相合金Fe73.5Si13.5B9Nb3Cu1薄帶。利用X射線衍射儀和示差掃描量熱計對該非晶薄帶的非晶特性及其晶化過程進行研究，并用電化學(xué)極化曲線的方法和電化學(xué)阻抗技術(shù)對比研究非晶Fe78Si13B9和雙相合金Fe73.5Si13.5B9Nb3Cu1在1 mol/L NaCl溶液里的電化學(xué)腐蝕行為，用SEM對極化測試后的試樣形貌進行觀察；同時還研究不同的熱處理溫度對材料的結(jié)構(gòu)及在1 mol/L NaCl溶液里耐腐蝕性能的影響。結(jié)果表明：該非晶薄帶的晶化過程分為兩步；雙相合金比非晶合金的耐腐蝕性要好；隨著熱處理溫度升高，非晶合金和雙相合金的耐腐蝕性能都得到提高。
關(guān)鍵字: 非晶合金；雙相合金；晶化行為；耐腐蝕性能；擴散通道
（Shanghai Key Lab of Metal Functional Materials, School of Materials Science and Engineering,
Tongji University, Shanghai 200092, China）
Abstract:Amorphous ribbons of Fe78Si13B9 and Fe73.5Si13.5B9Nb3Cu1 were prepared by the single-roller melt-spinning process, and the ribbons of amorphous and nano-crystalline two-phase Fe73.5Si13.5B9Nb3Cu1 alloys were obtained by annealing. The amorphous ribbons and their crystallization processes were identified by differential scanning calorimeter and X-ray diffraction. A comparative study of the electrochemical corrosion behaviors of amorphous Fe78Si13B9 and two-phase Fe73.5Si13.5B9Nb3Cu1 alloys was performed by the linear polarization method and electrochemical impedance spectroscopy (EIS) in 1 mol/L NaCl solution. The morphologies of the samples after potentiodynamic polarization were observed by SEM. The influence of heat treatment at different temperatures on the alloy structure and corrosion resistance in 1mol/L NaCl solutions was investigated. The results show that the crystallization process of the amorphous ribbons can be divided into two steps, and the two-phase alloy has a higher corrosion resistance than the amorphous alloy. The corrosion resistances of the amorphous and two-phase alloys increase as the thermal treatment temperature rises.
Key words: amorphous alloy; two-phase alloy; crystallization behavior; corrosion resistance; diffusion path
