【摘要】 利用高温热处理炉、扫描电镜和X射线衍射仪等研究了镍基单晶合金在Na2SO4、NaCl以及75%Na2SO4+25%NaCl中的热腐蚀行为。结果表明:在700℃腐蚀10 h时,镍基合金在75%Na2SO4+25%NaCl溶液中的热腐蚀最为严重,其次为Na2SO4,在NaCl中的热腐蚀程度最轻;合金在Na2SO4溶液中主要发生氧化-硫化反应,腐蚀产物主要由Al2O3、NiO、Cr2S3、Ni3S2、NiCr2O4和TiS组成;在NaCl溶液中的热腐蚀主要发生氧化反应,腐蚀产物主要由Na2CrO4、NiO和A12O3组成;在75%Na2SO4+25%NaCl溶液中的热腐蚀以氧化-硫化为主,腐蚀产物主要为Al2O3、NiO、TiO2、CrO、CrS、Ni3S2以及少许CoCr2S4。更多还原

【Abstract】 The hot corrosion behavior of Ni-based single crystal superalloy in different mediums was investigated.The corrosion testing results show that the most serious corrosion occurs in 75%Na2SO4+25%NaCl medium,and the least in NaCl when the alloy is corroded at 700℃ for 10 h.When the alloy is corroded in Na2SO4 medium,Al2O3,NiO,Cr2S3,Ni3S2,NiCr2O4 and TiS form,which indicate that the oxidation and sulfuration reaction occurs.For corroding in 75%Na2SO4+25%NaCl,oxides and sulfides such as Al2O3,NiO,TiO2,CrO,CrS,Ni3S2 and CoCr2S4 form,which mean that the oxidation and sulfuration reactions occur in the medium at 700℃.更多还原