改进型INCONEL740镍基合金在模拟煤灰和烟气环境中的腐蚀行为  

Corrosion Behavior of Modified Ni Based Alloy INCONEL 740 in Simulated Coal-ash/Flue-gas Environments

作　　者：江涌[1] 赵双群[2] 李维银[2] 

机构地区：[1]西北第二民族学院材料科学与工程学院,宁夏银川750021 [2]宁夏大学物理系,宁夏银川750021

出　　处：《机械工程材料》2008年第12期29-32,43,共5页Materials For Mechanical Engineering

基　　金：宁夏高等学校科学技术研究资助项目(2004Y035)

摘　　要：用SEM、EDX等方法对改进型INCONEL740镍基合金在人工模拟燃煤锅炉中的煤灰和烟气环境中的腐蚀行为进行了分析。结果表明:在750℃条件下,该合金所遭受的腐蚀过程分为两个阶段,开始时伴随着表面Cr2O3保护膜的形成,主要是氧化和硫化腐蚀,随着腐蚀时间增至5 000 h,腐蚀加剧;钴或CoO在合金表面熔盐中的溶解是造成合金腐蚀加剧的主要原因;而内硫化腐蚀则始终存在于腐蚀的进程中;铁含量少的试样比铁含量多的试样耐腐蚀性好。The corrosion behavior of the modified Ni based alloy INCONEL 740,exposed to the simulated coal-ash/flue-gas environments in the combustion furnace,at 750 ℃,has been studied by using SEM,EDX and so on.The results indicate that the corrosion of the modified alloy could be divided into two stages.During the initial stage,with the formation of protective Cr2O3 thin film on the alloy surface,the main corrosion form were oxidation and sulfidation.The corrosion was aggravated when the corrosion continued to 5 000...

关 键 词：INCONEL740合金 燃煤锅炉 硫化腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理]