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Fe基非晶及納米晶合金的制備和電化學(xué)腐蝕行為
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上海市科委納米專(zhuān)項(xiàng)基金(0752nm004)


Preparation and Electrochemical Corrosion Behavior of Amorphous and Nanocrystalline Fe-Based Alloys
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    摘要:

    分別采用單輥甩帶法和非晶晶化退火法制備出非晶及納米晶合金Fe73.5Si13.5B9Nb3Cu1；利用DSC、XRD和TEM對(duì)該非晶合金的晶化行為進(jìn)行了分析；并用電化學(xué)極化曲線(xiàn)的方法和電化學(xué)阻抗技術(shù)研究了該非晶合金經(jīng)不同溫度退火后在1 mol/L HCl溶液里的電化學(xué)腐蝕行為。結(jié)果表明，該非晶合金的晶化過(guò)程出現(xiàn)2個(gè)階段。當(dāng)退火溫度為500 ℃時(shí)，合金尚未晶化，仍保持非晶態(tài)；當(dāng)溫度達(dá)到550 ℃時(shí)，出現(xiàn)了晶化衍射峰，晶粒平均直徑約13 nm；當(dāng)溫度達(dá)到600 ℃時(shí)，晶粒平均直徑約為15 nm。經(jīng)過(guò)退火得到的納米晶合金的腐蝕電位大于未退火的非晶，且陽(yáng)極電流密度變得更低，表明納米晶狀態(tài)時(shí)的耐腐蝕性能比非晶狀態(tài)的更好。該非晶合金未退火、550 ℃退火和600 ℃退火時(shí)的EIS均由單一容抗弧構(gòu)成，具有一時(shí)間常數(shù)；且隨著退火溫度升高，電化學(xué)反應(yīng)電荷轉(zhuǎn)移電阻在增大

    Abstract:

    Amorphous Fe73.5Si13.5B9Nb3Cu1 alloy was prepared by the chill block melt-spinning process and the nanocrystalline alloy was obtained by amorphous crystallization annealing. The crystallization behavior was analysed by DSC, XRD and TEM. The electrochemical corrosion behavior in different annealed states was investigated by linear polarization method and electrochemical impedance spectroscopy in 1 mol/L HCl solution. The results show that the crystallization of the amorphous alloy occurs in the two steps. Some nanometer crystals appear when annealed at 550 oC and 600 oC with grain size of 13 nm and 15 nm, respectively. 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 consist of only single semi-circle. The charge transfer reaction resistances increases as the annealing temperature rises.

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李 翔,嚴(yán) 彪,項(xiàng)秋偉,王宇鑫,李 勁. Fe基非晶及納米晶合金的制備和電化學(xué)腐蝕行為[J].稀有金屬材料與工程,2011,40(3):495~498.[Li Xiang, Yan Biao, Xiang Qiuwei, Wang Yuxin, Li Jin. Preparation and Electrochemical Corrosion Behavior of Amorphous and Nanocrystalline Fe-Based Alloys[J]. Rare Metal Materials and Engineering,2011,40(3):495~498.]
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  • 收稿日期:2010-03-25
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