Fe-Si金属间化合物多孔材料的制备与耐腐蚀性能  

Preparation and corrosion resistance of porous Fe-Si intermetallics

作　　者：康建刚[1] 吝楠[1] 江垚[1] 高海燕[1] 贺跃辉[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2017年第1期122-127,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51404301)

摘　　要：以Fe粉和Si粉为原料,采用模压成形–真空烧结法制备Si的摩尔分数分别为25%,38%和50%的3种Fe-Si金属间化合物多孔材料。利用X射线衍射(XRD)、扫描电镜(SEM)和泡压法等对不同组分Fe-Si多孔材料的物相组成、微观形貌和孔结构特征进行表征,通过静态浸泡腐蚀实验研究Fe-50%Si多孔材料在酸、碱、盐溶液中的耐腐蚀性能。结果表明:这3种Fe-Si金属间化合物多孔材料的孔隙特征明显,平均孔径约为15μm,N2渗透通量约为170 m3/(m2·k Pa·h)。Fe-50%Si金属间化合物多孔材料在碱溶液中浸泡腐蚀30 d后,质量增加率为1.93%,N2渗透通量降至77 m3/(m2·k Pa·h),耐碱腐蚀性能较差;而在强酸及盐溶液中经过30 d浸泡腐蚀后,孔隙形貌几乎无变化,质量增加率仅分别为0.23%和0.17%,孔径和N2渗透通量几乎未发生变化,表现出优异的耐腐蚀性能。Three kinds of porous Fe-Si intermetallics were fabricated through molding compression-reaction synthesis in vacuum furnace, in which the atomic ratios of Si were 25%, 38% and 50%, respectively. The phase composition, morphology and pore structure of Fe-Si intermetallics were investigated by XRD, SEM and bubble-pressure method. The corrosion resistance of Fe-50% Si material in different media （acid, alkali and salt solution） were studied by immersing test. The results show that the sintered porous Fe-Si intermetallics show rich porous microstructure, the average pore size is about 15 I.tm and N2 permeability is about 170m^3/（m^2·k Pa·h）. Fe-50% Si intermetallic presents poor corrosion resistance in NaOH solution with mass increasing 1.93% and N2 permeability decreasing to 77 m^3/（m^2·k Pa·h）. However, it exhibits good corrosion resistance in H2SO4 and Na2SO4 solution with mass loss ratio of 0.23% and 0.17%, respectively, and no obvious change in microstructure and pore structure can be observed after 30 days＇ immersing test.

关 键 词：FE-SI 金属间化合物 多孔材料 孔结构 耐腐蚀性能 

分 类 号：TG172[金属学及工艺—金属表面处理]