摘要
研究了NiAl-Cr(Mo)合金的微观组织和高温下(750、800、850、900℃)在75%Na2SO4+25%NaCl(质量分数)混合盐中的腐蚀行为。实验结果表明:NiAl合金由于添加了大量的Cr、Mo合金化元素,其微观组织发生了明显的变化,形成了由预共晶β-NiAl基体相和层片状Cr(Mo)相组成的共晶组织;NiAl-Cr(Mo)合金在热腐蚀后,合金表面形成了一层致密的Cr2O3保护膜,并含有少量的Al2O3,随着温度的升高,保护膜层加厚。采用扫描电镜(SEM)、透射电镜(TEM)观察合金微观组织和腐蚀后的表面形貌,分析了NiAl-31Cr-3Mo合金高温腐蚀机理。
NiAl-Cr（Mo） alloy was investigated for microstructure and corrosive behavior in 75%Na2SO4＋25%NaCl mixture at high temperature（750,800,850 and 900 ℃）.The results revealed that the microstructure of NiAl alloy significantly changed because the addition of a large amount of Cr and Mo elements,forming eutectic structure consisting of pre-eutectic β-NiAl matrix phase and Cr（Mo） lamellar phase.After high temperature corrosion,on NiAl-Cr（Mo） alloy surface formed a layer of Cr2O3 dense protective film containing a little Al2O3,which got thick with an increase in experimental temperature.The alloy microstructure and the surface morphology after corrosion were observed by scanning electron microscope（SEM） and transmission electron microscopy（TEM）.The corrosive mechanism of the NiAl-31Cr-3Mo alloy was analyzed as well.
出处
《矿冶工程》
CAS
CSCD
北大核心
2010年第6期93-96,共4页
Mining and Metallurgical Engineering
基金
国防基础科研(A3720060115)
湖南省科技厅项目(2008TP4024-2)资助
