不同温度下DD10合金钎焊接头热腐蚀行为研究

赵欣宇, 刘恩泽, 张功, 赵媛, 宁礼奎, 信昕, 贾丹, 刘伟华, 谭政

Hot Corrosion Behavior of Brazed Joints of Single Crystal Ni-based DD10 Alloy Beneath Na2SO4 Deposit in Air at 850 and 900 ℃

ZHAO Xinyu, LIU Enze, ZHANG Gong, ZHAO Yuan, NING Likui, XIN Xin, JIA Dan, LIU Weihua, TAN Zheng

表2 850 ℃下Ti、Cr和Al与O及固态Na2SO4反应的标准Gibbs自由能

Table 2 Standard Gibbs free energy changes of the reactions of Ti, Cr and Al with oxygen and solid Na2SO4 at 850 ℃

Reaction ΔG850oC / kJ·mol-1 8/3Al + 2O2 (g) = 4/3Al2O3 -1760.877 2Ti + 2O2 (g) = 2TiO2 -1481.985 8/3Cr + 2O2 (g) = 4/3Cr2O3 -1126.937 8/3Al + Na2SO4 (s) = 4/3Al2O3 + Na2S (l) -1113.022 2Ti + Na2SO4 (s) = 2TiO2 + Na2S (l) -834.130 8/3Cr + Na2SO4 (s) = 4/3Cr2O3 + Na2S (l) -479.081 6TiO2 + Na2SO4 (s) = Na2Ti6O13 + SO3 (g) 140.699 Cr2O3 + Na2SO4 (s) = Na2Cr2O4 + SO3 (g) 317.719 Al2O3 + Na2SO4 (s) = 2NaAlO2 + SO3 (g) 326.557