新型高铬镍基合金涂层在H_2S气氛中抗高温腐蚀性能的研究  

High temperature Corrosion Behavior of a New-type High-Cr-Content Coating Exposured to H_2S-containing Environments

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,北京100088

出　　处：《稀有金属》2001年第6期440-443,共4页Chinese Journal of Rare Metals

摘　　要：针对燃煤电厂锅炉“四管”硫化腐蚀的严峻现状 ,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 40 %以上 )涂层和另一种传统的镍铬合金 (Ni70Cr30 )涂层在H2 S气氛中的高温腐蚀动力学规律进行了研究。采用金相显微镜、配有能谱分析仪的扫描电镜以及X射线衍射仪等检测设备对腐蚀产物的形貌和相组成等进行了分析。由新型高铬合金制备的涂层具有优良的抗硫化腐蚀性能 ,适于作为燃煤电厂锅炉“四管”用的防护材料。With regard to the severe sulphidation phenomenon of boiler tubes used in coal-burning electrical power plants, exposure to a mixe d gas environments containing 10% H_2S at 500 and 600℃ are used to study the cor rosion behaviour of two coatings arc-sprayed on 20 steel substrate. While one o f the coatings is made from conventional Ni70Cr30 alloy, the other is of a high -content(above 40%) Ni-based alloy newly developed by the authors' research gr oup.The curves of kinetic rate are plotted according to the thermogravimetric re sults of the coatings. Metallurgical microscope and SEM are used to observe the morphology of the corrosion products and X-ray diffraction is used to determine the phase structures. The results obtained indicate that the coating made from the high-Cr alloy shows excellent resistance to sulphidation and is suitable fo r use in the protection of boiler tubes.

关 键 词：锅炉管 硫化腐蚀 高铬镍基合金涂层 腐蚀动力学 电站锅炉 

分 类 号：TM621.2[电气工程—电力系统及自动化] TG172.33[金属学及工艺—金属表面处理]