某电厂锅炉水冷壁管及表面电弧喷涂NiCr涂层高温腐蚀行为机理分析  

Mechanism analysis for high-temperature corrosion behaviors of boiler water-wall tube and its arc spraying NiCr coating in a power plant

作　　者：朱秋瑜 秦建新[2] ZHU Qiuyu;QIN Jianxin(Queen Mary University of London Engineering School,Northwestern Polytechnical University,Xi’an 710129,China;Huaneng Hanfeng Power Plant,Handan 056200,China)

机构地区：[1]西北工业大学伦敦玛丽女王大学工程学院,陕西西安710129 [2]华能邯峰电厂,河北邯郸056200

出　　处：《热力发电》2024年第7期143-148,共6页Thermal Power Generation

摘　　要：在低氮氧燃烧技术及深度调峰技术广泛应用的背景下,锅炉水冷壁管在服役过程中的高温腐蚀失效更为严重。对比研究了取自某电厂锅炉水冷壁管及高速电弧喷涂PS45涂层管的高温腐蚀行为特征,利用SEM、EDS、XRD等手段对腐蚀表面形貌特征、腐蚀产物组成及腐蚀截面特征进行了系统分析。结果表明:高速电弧喷涂PS45涂层可有效提高水冷壁管的抗高温腐蚀性能,其表面腐蚀层厚度较小;在高温服役过程中,PS45涂层因其高Cr、Ni元素而表现出更好的抗腐蚀性能,其表面腐蚀产物层较薄,但涂层粒子间的微观孔隙会导致高温腐蚀反应的侵入,甚至导致涂层/基材界面处水冷壁管的直接腐蚀。Under the background of wide application of low nitrogen and oxygen combustion technology and deep peaking technology,the high temperature corrosion failure of water wall tubes is more serious in service process.The high-temperature corrosion behavior characteristics of the boiler water wall tube and high-speed arc spraying PS45 coated tube from a power plant were comparatively investigated.Moreover,the corrosion surface morphology,corrosion products compositions and corrosion cross section characteristics were systematically analyzed by means of SEM,EDS and XRD.The results show that,the high-speed arc spraying PS45 coating can effectively improve the high temperature corrosion resistance of water wall tubes,and the thickness of the surface corrosion layer is small.In the process of high temperature service,the PS45 coating shows better corrosion resistance due to its high content of Cr and Ni,and the thickness of the surface corrosion products layer is thin.However,the microscopic pores between the coating particles will lead to intrusion of high-temperature corrosion reactions,and even cause direct corrosion of the water wall tubes at the coating/substrate interface.

关 键 词：水冷壁 高温腐蚀 腐蚀机理 电弧喷涂 NICR涂层 

分 类 号：TM621.2[电气工程—电力系统及自动化]