镍基单晶合金在900℃硫酸盐熔盐中的热腐蚀行为  

Hot Corrosion Behaviors of Single-crystal Ni-based Superalloy in Molten Sulfate at 900 ℃

作　　者：卢旭东[1] 陈涛[1] 李光瑞[1] 郭策安[1] 郝清伟[1] 

机构地区：[1]沈阳理工大学装备工程学院,辽宁沈阳110159

出　　处：《电镀与精饰》2012年第8期6-9,共4页Plating & Finishing

基　　金：辽宁省教育厅资助项目(L2012063)

摘　　要：采用X-射线衍射、扫描电镜及能谱等测试手段,研究了一种镍基单晶合金在75%Na2SO4+25%K2SO4熔盐中的热腐蚀行为,该熔盐θ为900℃。结果表明,镍基单晶合金热腐蚀严重,出现严重的内硫化和内氧化;外层腐蚀产物由Al2O3、Cr2O3、Ni2Cr2O4和Co2Cr2O4相组成,内层为Al2O3和CrS;镍基单晶合金表面形成的氧化物发生碱性溶解。The hot corrosion behaviors of single-crystal Ni-based superalloy were investigated at 900 ℃ in molten sulfate by using SEM,XRD and EDAX.The results showed that the oxidation and sulfuration of alloy were co-occured during the hot corrosion.After corrupted for 30 h,the oxide in the outer layer was consist of Al2O3,Cr2O3,Ni2Cr2O4 and Co2Cr2O4 phases,the oxide in the inner layer was identified as CrS and Al2O3 phase.And the dissolution of the oxides on the alloy surface obeys the regularity of alkaline dissolving.

关 键 词：镍基单晶合金 熔盐 热腐蚀 

分 类 号：TG174.4[金属学及工艺—金属表面处理]