摘要
利用粉末冶金技术制备了新型Te-Ni-Cr合金材料。通过静态质量损失试验,X射线物相分析,扫描电镜形貌观察及微区成分分析等手段,研究了合金在750℃Na2SO4-25wt%NaCl熔盐中的热腐蚀行为及热腐蚀动力学规律。研究表明:稀有元素碲的加入,使合金的腐蚀速率较Ni-Cr合金有比较明显的下降;随时间的延长,合金表面的腐蚀程度不断增加;腐蚀产物主要为铁的氧化物、镍及铬的硫化物和氧化物;热腐蚀层主要由铁的氧化物和Cr2O3组成。
Te-Ni-Cr alloys have been prepared by powder metallurgy technology. The hot corrosion behavior and the law of corrosion kinetics of alloys in Na2SO4-25wt%NaCl molten salt of 750℃were studied by means of static mass loss experiment, X-Ray diffraction, scanning electron microscopy and chemical analysis. The results show that the corrosion rate of the alloy increases with the extension of time and the curve of corrosion kinetics gives a slow change at the beginning, but rapid changes in the middle and at the end tends to smooth. The SEM morphology indicates that the surface corrosion intensifies with time. The corrosion products mainly contain iron oxide, sulfides of nickel and chromium; and the hot corrosion layer is composed of iron oxide and Cr2O3.
出处
《铸造》
CAS
CSCD
北大核心
2012年第1期25-28,31,共5页
Foundry
