新型高铬镍基合金涂层在SO_2/O_2气氛中的抗高温腐蚀性能  

Hot Corrosion Behavior of A New-Type High Cr Ni-Base Coating in SO_2-Containing Environment

作　　者：李学锋[1] 杨中元[1] 秦颢[1] 雷宏[1] 周贻茹[1] 袁冠森[1] 

机构地区：[1]北京有色金属研究总院209室,北京100088

出　　处：《材料保护》2002年第4期44-46,共3页Materials Protection

摘　　要：基于动力用煤在燃烧过程中产生的硫氧化物对电厂锅炉“四管”造成的腐蚀 ,采用 2 0钢作为基体材料 ,对自行研制的新型高铬镍基合金 (铬含量在 4 0 %以上 )涂层和另一种传统的镍铬合金 (Ni70Cr30 )涂层在SO2 /O2 气氛中的高温腐蚀动力学规律进行了研究 ,并采用金相显微镜、配有能谱分析仪的扫描电镜以及X ray衍射仪等对腐蚀产物的形貌和组成等进行了分析。结果表明 ,由新型高铬合金制备的涂层具有优良的抗硫氧化物腐蚀性能 ,适于作燃煤电厂锅炉“四管”With regard to the severe sulphidation phenomenon of boiler tubes in coal\|burning electrical energy plants, corrosion behaviors of two coatings arc\|sprayed on 20 steel substrate were studied in environment exposure to oxygen and sulphur mixtures at 400 ℃ and 550 ℃. While one of the coatings was made of conventional Ni\|30Cr alloy, the other was a high\|Cr content (above 40%) Ni\|based alloy. The morphology and structure of corrosion product were determined by metallurgical microscope, SEM and X\|ray diffraction. Results indicated that high Cr\|Ni alloy coating showed excellent resistance to sulphidation and was suitable for protecting boiler tubes.

关 键 词：高铬镍基合金涂层 SO2/O2气氛 抗高温腐蚀性能 二氧化硫 氧气 硫氧化物腐蚀 腐蚀动力学 

分 类 号：TG174.4[金属学及工艺—金属表面处理]