T91钢在KCl+Na_2SO_4+K_2SO_4熔融盐中的热腐蚀行为研究  

Hot Corrosion of T91 Steel in Molten Mixture of KCl+Na_2SO_4+K_2SO_4

作　　者：刘光明[1] 刘康生[1] 毛晓飞 万中平 黄健航[1] 于明明 汪元奎 

机构地区：[1]南昌航空大学材料科学与工程学院,南昌330063 [2]国电科学技术研究院,武汉430066 [3]东方锅炉股份有限公司材料研究所,自贡643001

出　　处：《中国腐蚀与防护学报》2017年第1期23-28,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51161022);江西省教育厅科技计划(DB201301133和201301050);国电集团科技项目(2016-02)~~

摘　　要：研究了T91钢在600,650和700℃10%KCl+10%K_2SO_4+80%Na_2SO_4(质量分数)混合熔融盐中的热腐蚀行为。采用XRD,SEM/EDS对腐蚀产物膜相组成和形貌进行了分析。结果表明,T91钢在腐蚀过程中均表现为失重,特别是在650和700℃下失重尤为严重。600℃下的腐蚀产物膜主要由Fe_3O_4组成;而650和700℃下的腐蚀产物膜基本剥落殆尽,EDS分析表明残留的腐蚀产物中S含量较高,这导致腐蚀产物严重剥落。熔盐中Cl可与Cr_2O_3反应生成挥发性的CrO_2Cl_2,导致腐蚀进一步加速。The hot corrosion behavior of T91 steel in molten salts of 10%KCl＋10%K2SO4＋80%Na2SO, was studied at 600, 650 and 700℃ respectively. The microstructure and composition of the corrosion products were characterized by scanning electron microscope/energy dispersive spectroscope （SEMI EDS） and X-ray diffraction （XRD）. Mass loss was observed at various temperatures during the tests, especially disastrous mass loss occurred at 650 and 700℃. The main corrosion product was identified as Fe30, after corrosion at 600℃. However, the corrosion products spalled off seriously during the hot corrosion at 650 and 700℃. The residual corrosion products were rich in S, which was the main reason for serious spallation of the corrosion products. Cl existed in the molten salts could react with Cr2O3 to form volatile CRO2Cl2, which accelerated the hot corrosion process.

关 键 词：T91钢 热腐蚀KCl+K2SO4+Na2SO4熔盐 

分 类 号：TG174.45[金属学及工艺—金属表面处理]