Corrosion Behavior of Al2O3 Reinforced Fe Metal Matrix Nanocomposites Produced by Powder Metallurgy Technique
Corrosion Behavior of Al2O3 Reinforced Fe Metal Matrix Nanocomposites Produced by Powder Metallurgy Technique
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DOI：
10.1166/asem.2013.1265
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
Pallav Gupta;Devendra Kumar;M. Quraishi;O. Parkash
中科院分区：
文献类型：
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作者：
Pallav Gupta;Devendra Kumar;M. Quraishi;O. Parkash
比较了粉末冶金法制备的Al2O3增强铁基纳米复合材料（Fe-5 wt% Al2O3）与纯铁在自由掺气1N HCl溶液中的腐蚀行为。在900 ~ 1100℃的氩气气氛中烧结1 ~ 3小时，制备复合材料和铁试样。复合材料微观结构表现为Fe为基体相，Al2O3为分散相，纳米级铝酸铁为分散相。陶瓷Al2O3和铝酸铁颗粒的存在提高了铁的耐蚀性，这与烧结温度和烧结时间有关。耐蚀性随烧结温度和时间的增加而提高。腐蚀试样的x射线衍射（XRD）图显示氯酸铝（AlCl3O12）的形成。腐蚀速率高的试样中AlCl3O12相浓度最高，腐蚀速率低的试样中AlCl3O12相浓度最低。扫描电镜显示，低腐蚀试样中晶粒呈床状组合，而高腐蚀试样中晶粒破碎严重。
Corrosion behavior of Al2O3 reinforced Fe-based metal matrix nanocomposites (Fe-5 wt% Al2O3), prepared by powder metallurgy route has been compared with that of pure Fe in freely aerated 1N HCl solution. The composite and Fe specimens were prepared by sintering in an argon atmosphere in the temperature range 900–1100 °C for 1–3 hours. Microstructure of composite shows presence of Fe as matrix phase with Al2O3 and nano size iron aluminate as dispersed phases. Presence of ceramic Al2O3 and iron aluminate particles improved the corrosion resistance of iron, which depend on sintering temperature and time. Corrosion resistance improved with increasing sintering temperature and time. X-ray diffraction (XRD) patterns of corroded specimens revealed the formation of aluminum Chlorate (AlCl3O12). Concentration of AlCl3O12 phase was highest in the specimen with highest corrosion rate and was lowest in the specimen with low corrosion rate. SEM shows a combination of bed of grains in the specimen with low corrosion while the grains were shattered heavily in the specimen with high corrosion.