几种超级不锈钢在模拟低温多效海水淡化环境中的点蚀行为研究
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摘要
在温度分别为20,40和70℃的2倍浓缩海水模拟溶液中,利用循环伏安曲线测试和SEM观察研究,对316不锈钢和超级不锈钢904L、254sMo以及2507的极化行为和表面点蚀形貌进行了研究。结果表明,在该环境中,升高温度可降低316、904L、254sMo和2507等4种不锈钢表面钝化膜的稳定性并提高其点蚀敏感性。在不同温度中,316不锈钢表面均发生严重点蚀损伤,而254sMo和2507不锈钢表面均无明显点蚀迹象。在低温时,904L不锈钢钝化膜击穿电位较高,点蚀坑尺寸较小,点蚀倾向较低;在高温时,其点蚀电位显著降低,点蚀坑尺寸明显增大,点蚀倾向较大。
The pitting corrosion behavior of stainless steels 316, 904 L, 2507 and 254 sMo in a twofold condensate sea water at different temperature was investigated, which aims to simulate the water environment encountered in low temperature multi effect desalination unit, by means of electrochemical cyclic polarization test and SEM. Results show that the increase of temperature can reduce the stability of passivation films of stainless steels 316, 904 L, 254 sMo and 2507 and increase their pitting sensitivity. Serious pitting corrosion occurred on the surface of 316 stainless steel at different temperatures, while no obvious pitting corrosion was found on stainless steels 254 sMo and 2507. At low temperature, the stainless steel 904 L presented higher pitting potential, smaller pitting size and lower pitting tendency. However, at high temperature, its pitting potential decreased significantly, pitting size increased and pitting corrosion tendency became larger.
The pitting corrosion behavior of stainless steels 316, 904 L, 2507 and 254 sMo in a twofold condensate sea water at different temperature was investigated, which aims to simulate the water environment encountered in low temperature multi effect desalination unit, by means of electrochemical cyclic polarization test and SEM. Results show that the increase of temperature can reduce the stability of passivation films of stainless steels 316, 904 L, 254 sMo and 2507 and increase their pitting sensitivity. Serious pitting corrosion occurred on the surface of 316 stainless steel at different temperatures, while no obvious pitting corrosion was found on stainless steels 254 sMo and 2507. At low temperature, the stainless steel 904 L presented higher pitting potential, smaller pitting size and lower pitting tendency. However, at high temperature, its pitting potential decreased significantly, pitting size increased and pitting corrosion tendency became larger.
引文
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[2]Wang B G.Corrosion analysis and treatment of condenser in low temperature multi effect desalination plant[A].Proceeding 2011Annual Academic Conference of Power Plant Chemistry[C].Shanghai,2011:285(王丙贵.低温多效海水淡化装置冷凝器腐蚀分析与治理[A].中国电机工程学会电厂化学2011学术年会论文集[C].上海,2011:285)
[3]Liu B D.Corrosion and anticorrosion measures of seawater desalination equipment[A].Proceeding 2006 Annual Academic Conference of Tianjin Electric Power Society[C].Beijing,2006:116(刘伯东.海水淡化设备的腐蚀与防腐措施[A].京津冀晋蒙鲁电机工程(电力)学会第十五届学术交流会论文集[C].北京,2006:116)
[4]Liu B D.Research on technology of preventing seawater demineralizing equipment from corrosion[J].North China Electr.Pow.,1999,(2):13(刘伯东.海水淡化设备防腐工艺的防腐研究[J].华北电力技术,1999,(2):13)
[5]Noh J S,Laycock N J,Gao W,et al.Effects of nitric acid passivation on the pitting resistance of 316 stainless steel[J].Corros.Sci.,2000,42:2069
[6]Zakeri M,Nakhaie D,Naghizadeh M,et al.The effect of dichromate ion on the pitting corrosion of AISI 316 stainless steel.Part I:Critical pitting temperature[J].Corros.Sci.,2015,93:234
[7]Naghizadeh M,Nakhaie D,Zakeri M,et al.The effect of dichromate ion on the pitting corrosion of AISI 316 stainless steel Part II:Pit initiation and transition to stability[J].Corros.Sci.,2015,94:420
[8]Sun C Q.Development,performance and application of super austenitic stainless steel:Part 2[J].Proc.Equip.Pip.,2000,37(1):52(孙长庆.超级奥氏体不锈钢的发展,性能与应用(下)[J].化工设备与管道,2000,37(1):52)
[9]Lee J S,Fushimi K,Nakanishi T,et al.Corrosion behaviour of ferrite and austenite phases on super duplex stainless steel in a modified green-death solution[J].Corros.Sci.,2014,89:111
[10]Kim S T,Kim S Y,Lee I S,et al.Effects of shielding gases on the microstructure and localized corrosion of tube-to-tube sheet welds of super austenitic stainless steel for seawater cooled condenser[J].Corros.Sci.,2011,53:2611
[11]Standard practice for the preparation of substitute ocean water[Z].ASTM D1141-98,2013
[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]Wang C G,Dong J H,Ke W,et al.Investigation on pitting corrosion behavior of copper in the mixed solution of HCO3-,SO42-and Cl-[J].Acta Metall.Sin.,2013,49:207(王长罡,董俊华,柯伟等.HCO3-,SO42-和Cl-混合体系中Cu点蚀行为的研究[J].金属学报,2013,49:207)
[15]Pistorius P C,Burstein G T.Metastable pitting corrosion of stainless steel and the transition to stability[J].Philosoph.Trans.:Soc.Mathemat.Phys.Eng.Sci.,1992,341R:531