几种超级不锈钢在模拟烟气脱硫环境中的缝隙腐蚀行为研究
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摘要
在70℃的死亡绿液中,对316不锈钢以及超级不锈钢904L,254sMo和2507的人造缝隙电极进行了循环伏安测试和腐蚀形貌观察。结果表明,在70℃的死亡绿液中,254sMo和2507不锈钢具有良好的耐缝隙腐蚀能力,316和904L不锈钢的缝隙腐蚀损伤均十分严重。在缝隙边缘,316和904L不锈钢均呈现"蕾丝盖"结构,254sMo和2507不锈钢未见该腐蚀形貌。在缝隙腐蚀坑底部,超级双相不锈钢2507呈现电偶腐蚀的形貌特征。
The crevice corrosion of 316, 904L, 254sMo and 2507 stainless steels in a liquid of the so called green death at 70 ℃, which aims to simulate the corrosive environment of flue gas desulfurization process, was comparatively investigated by means of electrochemical cyclic polarization test and SEM.The results showed that 254sMo and 2507 stainless steel have excellent resistance to crevice corrosion,while the crevice corrosion induced damage of SS316 and SS904L is serious. The "lace cover" structures were observed on the edges of the gap of SS316 and SS904L, but not on that of SS254sMo and SS2507.At the bottom of crevice corrosion pit, duplex super stainless steel 2507 exhibits galvanic corrosion characteristics.
The crevice corrosion of 316, 904L, 254sMo and 2507 stainless steels in a liquid of the so called green death at 70 ℃, which aims to simulate the corrosive environment of flue gas desulfurization process, was comparatively investigated by means of electrochemical cyclic polarization test and SEM.The results showed that 254sMo and 2507 stainless steel have excellent resistance to crevice corrosion,while the crevice corrosion induced damage of SS316 and SS904L is serious. The "lace cover" structures were observed on the edges of the gap of SS316 and SS904L, but not on that of SS254sMo and SS2507.At the bottom of crevice corrosion pit, duplex super stainless steel 2507 exhibits galvanic corrosion characteristics.
引文
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[2]Xu S Q.Dew point corrosion and material selection(2)[J].Petrochem.Corros.Prot.,2000,17(3):1(许适群.关于露点腐蚀及用钢的综述(二)[J].石油化工腐蚀与防护,2000,17(3):1)
[3]He J J,Xiang X X.A review of chimney corrosion study and anticorrosion material research in WFGD[J].Environ.Technol.,2011,35(4):33(何佳杰,向贤伟.湿法烟气脱硫中烟囱腐蚀及其防腐材料研究现状[J].环境技术,2011,35(4):33)
[4]Gao W,Luo J M,Yang J J.Research progress and application of double phase stainless steel[J].Ordnance Mater.Sci.Eng.,2005,28(3):61(高娃,罗建民,杨建君.双相不锈钢的研究进展及其应用[J].兵器材料科学与工程,2005,28(3):61)
[5]Xu Q.Corrosion-resisting alloy selection for flue gas desulfurization unit(FGD)[J].Total Corros.Control,2010,24(10):6(许青.烟气脱硫(FGD)装置耐腐蚀合金的选择[J].全面腐蚀控制,2010,24(10):6)
[6]Kim M T,Oh O Y,Chang S Y.Analysis of degradation of a superaustenitic stainless steel for flue gas desulfurization system after a fire accident[J].Eng.Fail.Anal.,2008,15:575
[7]Han D,Jiang Y,Deng B,et al.Detecting critical crevice temperature for duplex stainless steels in chloride solutions[J].Corrosion,2011,67:025004
[8]Jamaluddin A M,Malika A U,Andijani I,et al.Crevice corrosion behavior of high-alloy stainless steels in a SWRO pilot plant[J].Desalination,2004,171:289
[9]Rajendran N,Rajeswari S.Super austenitic stainless steels-a promising replacement for the currently used type 316L stainless steel as the construction material for flue-gas desulphurization plant[J].J.Mater.Sci.,1996,31:6615
[10]Zhang Y G,Li S Y,Fan H Q,et al.Corrosion behavior of stainless steel in flue gas desulphurization system[J].Mater.Prot.,2010,43(3):64(张贻刚,李淑英,范洪强等.不锈钢在烟气脱硫系统中的腐蚀行为[J].材料保护,2010,43(3):64)
[11]Feng H.Research on corrosion behaviour of super austenitic stainless steel with high Mo and N in typically extreme environments[D].Shenyang:Northeastern University Dissertations,2014:21(冯浩.高钼高氮超级奥氏体不锈钢在典型极端环境中的腐蚀行为研究[D].沈阳:东北大学,2014:21)
[12]Wang C G,Dong J H,Ke W,et al.Research on pitting corrosion behavior of copper in the solution with HCO3-and Cl-[J].Acta Metall.Sin.,2012,48:1365(王长罡,董俊华,柯伟等.HCO3-和Cl-混合体系中Cu的点蚀行为研究[J].金属学报,2012,48:1365)
[13]Wang C G,Dong J H,Ke W,et al.Effect of HCO3-and SO42-on the pitting corrosion behavior of Cu[J].Acta Metall.Sin.,2012,48:85(王长罡,董俊华,柯伟等.HCO3-和SO42-对Cu点蚀行为的影响[J].金属学报2012,48:85)
[14]Yang Y Z,Jiang Y M,Li J.In situ investigation of crevice corrosion on UNS S32101 duplex stainless steel in sodium chloride solution[J].Corros.Sci.,2013,76:163
[15]Al-khamis J N,Pickering H W.IR mechanism of crevice corrosion for alloy T-2205 duplex stainless steel in acidic-chloride media[J].J.Electrochem.Soc.,2001,148:B314
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