低温省煤器防腐换热管表面耐蚀性能  

Corrosion Resistance of Different Tube Coatings for Low-temperature Economizers

作　　者：王帅 吴新[2] 张庆国 WANG Shuai;WU Xin;ZHANG Qingguo(Huadian Electric PowerResearch Institute, Hangzhou 310030, China;School of Energy and Environment, Southeast University, Nanjing 210096, China)

机构地区：[1]华电电力科学研究院,杭州310030 [2]东南大学能源与环境学院,南京210096

出　　处：《腐蚀科学与防护技术》2018年第3期266-272,共7页Corrosion Science and Protection Technology

基　　金："十二五"国家科技支撑计划(2012BAA02B01-02)~~

摘　　要：采用重量法测量了紫铜管、Ni-P镀层管、Ni-P-Cu镀层管和PTFE涂层管表面的腐蚀速率,并借助X射线衍射仪(XRD)、扫描电镜(SEM)和能谱仪(EDX),分别对不同管表面的物相结构和腐蚀前后的微观形貌及成分进行了研究和分析。结果表明:PTFE涂层管表面具有最优的耐蚀性能,其次是Ni-P-Cu镀层管和Ni-P镀层管,三者的耐蚀性能相比紫铜管均有明显的提高;紫铜管、Ni-P镀层管和Ni-P-Cu镀层管表面的物相结构分别为晶体结构、混晶体结构(以非晶结构为主)和非晶体结构,晶体含量越低,耐蚀性能越强;就耐蚀性能而言,PTFE涂层管是低温省煤器换热管的最优选择。The corrosion performance of heat exchange tube of cupper without and with different coatings, such as Ni-P, Ni-P-Cu and polytetrafluoroethylene（PTFE） in simulated flue gas solution of 3.5%（mass fraction） NaCl＋3.5% H2 SO4 at 25 ℃ was studied by means weigh change methods,X-ray diffractometer（XRD）, scanning electron microscopy（SEM） and energy spectrometer（EDX）. It is found that the corrosion resistance of Ni-P and Ni-P-Cu coated tubes are superior to that of the plain copper tube, and among others PTFE coated tubes have the optimal corrosion resistance. Besides, the Ni-P and Ni-P-Cu coatings present partially amorphous（mainly amorphous structure） and fully amorphous structure respectively, while the later shows better corrosion resistance. In general, the PTFE coated heat exchange tube is the optimal choice for the low-temperature economizer in terms of corrosion resistance.

关 键 词：低温省煤器 腐蚀 表面 晶体 紫铜管 电化学 

分 类 号：TB304[一般工业技术—材料科学与工程]