节镍含稀土23Cr型双相不锈钢点蚀性能研究
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摘要
为了研究节镍型含稀土双相不锈钢在中性氯化物溶液中的点蚀行为,采用阳极极化曲线、交流阻抗、扫描电镜(SEM)及X射线能谱仪(EDS)等方法研究了微量稀土元素对23Cr型双相不锈钢耐点蚀性能的影响。研究结果表明,加稀土后,23Cr型双相不锈钢在1.0 mol/L Na Cl溶液中的点蚀电位及钝化能力明显提高,稀土含量为0.028%的实验钢耐点蚀能力最强,稀土能提高23Cr型双相不锈钢的耐点蚀性能;硫化物夹杂是23Cr型双相不锈钢的主要点蚀诱发源;合适的稀土含量可以有效的净化钢液,变质长条硫化物夹杂为球状稀土夹杂;稀土夹杂弥散分布在钢中,且相互独立,不形成腐蚀的活性通道,抑制了23Cr型双相不锈钢点蚀的发生。
In order to study the pitting corrosion resistance of rare earth and saving Ni alloying 23Cr type duplex stainless in neutral chloride solution,the effects of rare earth element on corrosion resistance of 23Cr type duplex stainless steel(DSS)were investigated by anodic polarization curve,electrochemical impedance spectroscopy(EIS),scanning electron microscopy(SEM) and energy dispersive spectrometer(EDS). The results indicate that the pitting potential and passivation ability of 23Cr duplex stainless steel in 1. 0 mol/L Na Cl solution are significantly improved. The pitting corrosion resistance of 23Cr duplex stainless steel with 0. 028% RE is the best. The rare earth can improve the corrosion resistance of 23Cr duplex stainless steel. The sulphide inclusion is the main origin of pitting. The appropriate content of rare earth can effectively purify liquid steel and the strip sulphide inclusion can be replaced by spherical rare earth inclusion. The rare earth inclusion is dispersed in steel and independent of each other. And the rare earth inclusion doesn't form active path of corrosion and inhibits the occurrence of the pitting corrosion.
In order to study the pitting corrosion resistance of rare earth and saving Ni alloying 23Cr type duplex stainless in neutral chloride solution,the effects of rare earth element on corrosion resistance of 23Cr type duplex stainless steel(DSS)were investigated by anodic polarization curve,electrochemical impedance spectroscopy(EIS),scanning electron microscopy(SEM) and energy dispersive spectrometer(EDS). The results indicate that the pitting potential and passivation ability of 23Cr duplex stainless steel in 1. 0 mol/L Na Cl solution are significantly improved. The pitting corrosion resistance of 23Cr duplex stainless steel with 0. 028% RE is the best. The rare earth can improve the corrosion resistance of 23Cr duplex stainless steel. The sulphide inclusion is the main origin of pitting. The appropriate content of rare earth can effectively purify liquid steel and the strip sulphide inclusion can be replaced by spherical rare earth inclusion. The rare earth inclusion is dispersed in steel and independent of each other. And the rare earth inclusion doesn't form active path of corrosion and inhibits the occurrence of the pitting corrosion.
引文
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[2]J C de Lacerda,L C Candido,L B Godefroid.Effect of volume fraction of phases and precipitates on the mechanical behavior of UNS S31803 duplex stainless steel[J].International Journal of Fatigue,2015,74:81-87.
[3]Tucker J D,Miller M K,Young G A.Assessment of thermal embrittlement in duplex stainless steels 2003and2205 for nuclear power applications[J].Acta Materialia,2015,87(1):15-24.
[4]Hoseinpoor M,Momeni M,Moayed M H,et al.EIS assessment of critical pitting temperature of 2205 duplex stainless steel in acidified ferric chloride solution[J].Corrosion Science,2014,80:197-204.
[5]Wan J Q,Ran Q X,Li J,et al.A new resource-saving,low chromium and low nickel duplex stainless steel15Cr-x Al-2Ni-y Mn[J].Materials and Design,2014,53:43-50.
[6]刘丽珍,金自力,任慧平,等.稀土对取向硅钢初次再结晶组织及织构的影响[J].稀土,2015,36(6):1-6.Liu L Z,Jin Z L,Ren H P,et al.Influence of RE on primarily recrystallized texture and microstructure of grain oriented silicon steel[J].Chinese Rare Earths,2015,36(6):1-6.
[7]方琪,李春龙,白海瑞,等.高温条件下镧对高铌钢显微组织的影响[J].稀土,2015,36(5):32-36.Fang Q,Li C L,Bai H R,et al.Effects of La on microstructure of high niobium steel under high temperature conditions[J].Chinese Rare Earths,2015,36(5):32-36.
[8]李伟,武健鹏,徐静波,等.非金属夹杂物对耐候钢耐大气腐蚀性能的影响[J].稀土,2016,37(1):91-97.Li W,Wu J P,Xu J B,et al.The effects of non-metallic inclusions on the weatherability of weathering steel[J].Chinese Rare Earths,2016,37(1):91-97.
[9]赵莉萍,袁雪,李钊.镧对低镍奥氏体不锈钢晶间腐蚀的影响[J].稀土,2015,36(3):78-83.Zhao L P,Yuan X,Li Z.Effect of rare earth lanthanum on intergranular corrosion of low Ni Cr Mn N austenitic stainless steel[J].Chinese Rare Earths,2015,36(3):78-83.
[10]张慧敏,钦祥斗,赵莉萍,等.镧对低镍铬锰氮不锈钢组织和耐蚀性的影响[J].稀土,2014,35(3):36-39.Zhang H M,Qin X D,Zhao L P,et al.Effect of rare earth La on microstructure and corrosion resistance of low-nickel Cr-Mn-N stainless steel[J].Chinese Rare Earths,2014,35(3):36-39.
[11]邓博,蒋益明,龚佳,等.双相不锈钢临界点蚀温度和再钝化温度[J].中国有色金属学报,2007,17(S1):47-53.Deng B,Jiang Y M,Gong J,et al.Critical pitting and repassivation temperature for duplex stainless steel by cyclic-thermammetry method[J].The Chinese Journal of Nonferrous Metals,2007,17(S1):47-53.
[12]Cristofaro N D,Piantini M,Zacchetti N.The influence of temperature on the passivation behaviour of a super duplex stainless steel in a boric-borate buffer solution[J].Corrosion Science,1997,39(12):2181-2191.
[13]Cabot P L,Garrido J A,Pe'rez E,et al.EIS study of heat-treated Al-Zn-Mg alloys in the passive and transpassive potential regions[J].Electrochimica Acta,1995,40(4):447-454.
[14]Mu1oz A I,García A J,Gui1ón J L,et al.Inhibition effect of chromate on the passivation and pitting corrosion of a duplex stainless steel in Li Br solutions using electrochemical techniques[J].Corrosion Science,2007,49(8):3200-3225.
[15]Vannevik H,Nilsson J O,Frodigh J,et al.Effect of elemental partitioning on pitting resistance of high nitrogen duplex stainless steels[J].ISIJ International,1996,36(7):807-812.
[16]杨德钧,沈卓身.金属腐蚀学[M].北京:冶金工业出版社,1999,124-127.Yang D J,Shen Z S.Metallurgy Corrosion[M].Beijing:Metallurgical Industry Press,1999,124-127.
[17]张恒,陈学群,常万顺.冶金因素对钢点蚀扩展的影响[J].北京科技大学学报,2008,30(10):1133-1138.Zhang H,Chen X Q,Chang W S.Effect of metallurgical factors on the susceptibil ity to pitting initiation in steels[J].Journal of University of Science and Technology Beijing,2008,30(10):1133-1138.
[18]Ha H Y,Park C J,Kwon H S.Effects of misch metal on the formation of non-metallic inclusions and the associated resistance to pitting corrosion in 25%Cr duplex stainless steels[J].Scripta Materialia,2006,55(11):991-994.
[19]陈学群,孔小东,杨思诚.硫化物夹杂对低碳钢孔蚀扩展的影响[J].中国腐蚀与防护学报,2000,20(2):65-73.Chen X Q,Kong X D,Yang S C.Effect of sulfide inclusions on propagations of pitting in carbon steels[J].Journal of Chinese Society for Corrosion and Protection,2000,20(2):65-73.