NiCrAlY涂层在模拟烟气中的热腐蚀行为
Hot Corrosion Behavior of NiCrAlY Coating in Simulated Flue Gas
摘 要
采用超声速火焰喷涂在Super304H钢表面制备NiCrAlY涂层，研究了表面涂覆Na2SO4+K2SO4+Fe2O3盐膜的NiCrAlY涂层在650℃不同SO2含量模拟烟气环境中的热腐蚀行为。采用X射线衍射（XRD），扫描电镜（SEM）能谱仪（EDS）对该涂层及其高温腐蚀产物的成分、形貌进行了分析。结果表明：NiCrAlY涂层在含0.15%（质量分数）SO2的模拟烟气环境中表现出良好的耐蚀性，随着SO2含量的升高腐蚀加重，涂层表面腐蚀产物主要为NiCr2O4并含有少量Fe2O3；由于腐蚀介质通过涂层缺陷向内扩散，在涂层与基体界面生成了硫的富集腐蚀产物带。
模拟烟气
热腐蚀
NiCrAlY coating
simulated flue gas
hot corrosion
Abstract
NiCrAlY coating was prepared on Super304H steel surface by high velocity oxygen fuel spray. The hot corrosion behavior of the prepared NiCrAlY coatings covered with Na2SO4+K2SO4+Fe2O3 salt film was investigated in simulated flue gas with different content of SO2 at 650℃. The microstructure and composition of the coating and corrosion products were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The results show that the NiCrAlY coating exhibited good corrosion resistance in the simulated flue gas with 0.15% (mass fraction) SO2. The corrosion rate of the NiCrAlY coating was accelerated with increase of SO2 content. The corrosion products on the surface of NiCrAlY coating were mainly NiCr2O4 and contained a small amount of Fe2O3. Due to the corrosive medium diffused inward through coating defects, a sulfur-rich corrosion layer formed at the interface between coating and substrate.
中图分类号 TG147.45 DOI 10.11973/fsyfh-201908006
所属栏目 试验研究
基金项目
收稿日期 2018/2/10
修改稿日期
网络出版日期
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引用该论文: NI Jinfei,HONG Jia,LIU Guangming,LI Maodong,ZHANG Minqiang,PENG Yuchen. Hot Corrosion Behavior of NiCrAlY Coating in Simulated Flue Gas[J]. Corrosion & Protection, 2019, 40(8): 578
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【3】邢娜,黄宝,何立波,等.超临界超超临界锅炉管品种的开发现状.特殊钢,2016,37(1):17-21.
【4】鲁金涛,朱圣龙,王福会.共渗制备NiCrAlY涂层及抗高温腐蚀研究.中国表面工程,2010,23(2):15-19,25.
【5】李美栓,张亚明.活性元素对合金高温氧化的作用机制.腐蚀科学与防护技术,2001,13(6):333-337.
【6】靳惠明,陈荣发,张剑峰,等.金属镍高温氧化机理及稀土元素效应研究.机械工程材料,2004,28(5):7-10.
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【9】LIU G M, YANG H C, LIANG Q, et al. Corrosion behavior of the Ni-Cr-Fe base superalloy GH984G in a synthetic coal ash and flue gas environment. Acta Metallurgica Sinica (English Letters), 2017, 30(9):863-868.
【10】GORMAN D M, HIGGINSON R L, DU H, et al. Microstructural analysis of IN617 and IN625 oxidised in the presence of steam for use in ultra-supercritical power plant.Oxidation of Metals, 2013, 79(5/6):553-566.
【11】杨华春,梁勤,杨小川,等.镍-铬-铁基高温合金GH984G在不同SO2浓度烟气中的腐蚀行为.材料热处理学报,2017,38(1):83-88.
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【13】付广艳,俞立艳,刘群,等.Y2O3对机械合金化Fe-20Cr-2.5Al合金电化学腐蚀行为的影响.铸造,2016,65(3):280-283.
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【15】任鑫.几种高温防护涂层的高温氧化和热腐蚀行为研究.南京:南京理工大学,2005.
【16】SIDHU B S, PURI D, PRAKASH S. Characterisations of plasma sprayed and laser remelted NiCrAlY bond coats and Ni3Al coatings on boiler tube steels. Materials Science and Engineering:A, 2004, 368(1/2):149-158.
【17】BIRKS N, MEIER G H, PETTIT F S.金属高温氧化导论.辛丽,王文,译.北京:高等教育出版社,2010.
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