研究了带有不同含量Cr、Ni、Al、Y合金元素的CrNiFe基合金在600℃,Ps_2为64×10~2Pa,Po_2为0.53×10~(-2)Pa的硫蒸气环境下的高温硫化腐蚀。测定并比较了这些合金的硫化腐蚀失重,通过金相、X光衍射相分析和电子探针技术分析研究了硫化物锈层的形貌和结构特征。 研究结果表明:加入Cr对于降低合金硫化速率是有益的,而Ni含量的增加对合金的抗硫化性能是有害的,而加入少量的Al、Y对于提高合金抗硫化性能的作用十分显著。 在硫化物锈层组成和结构分析的基础上,讨论并提出了添加不同合金元素的合金的硫化机制。
High temperature sulfidation of FeCrNi base alloys containing different contents of Cr,Ni,Al, Y was studied in sulfur vapor under 600℃C with Ps_2=64×10~2Pa,Po_2=0.53×10~(-2)pa. Sulfidation kenetics of studied materials have been examined and compared. The structure and morphological features of sulfide scales have been investigated using metallographical, X-ray diffraction and EMPA techniques. The addition of Cr was shown to be beneficial in reducing corrosion rate. Increase in addition of Ni was shown to be detrimental. The beneficial effect of Al, Y minor additions on the sulfidation restistance was distinguished. Based on analyses of the structure and composition of sulfide scales,the sulfidation mechanisms of the alloys with different additions have been proposed.
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