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.
出处
《材料保护》
CAS
CSCD
北大核心
2002年第4期44-46,共3页
Materials Protection
