含铜低合金耐磨钢在盐雾环境中的腐蚀行为
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摘要
对含铜和不含铜实验钢在中性盐雾试验箱中连续喷雾120、240、480和720 h,研究了在盐雾环境下Cu对低合金耐磨钢耐腐蚀性能的影响规律,通过失重法计算腐蚀速率,并利用XRD和SEM对腐蚀产物进行表征,利用动电位扫描、电化学阻抗谱(EIS)对比分析Cu在低合金耐磨钢腐蚀过程中起到的作用。结果表明:低合金耐磨钢的腐蚀产物主要包括γ-FeOOH、α-FeOOH、Fe_3O_4、γ-Fe_2O_3,前期腐蚀产物疏松多孔,后期产物致密难剥落,腐蚀速率先升高后下降,含铜实验钢的腐蚀速率明显低于不含铜实验钢,添加Cu后,实验钢的自腐蚀电位上升,阻抗谱容抗弧增大,电荷转移难度增加,说明Cu能有效降低实验钢腐蚀速率,增强其耐腐蚀性能。
The effect of Cu on the corrosion resistance of low alloy wear-resistant steel in neutral salt spray environment was studied for 120, 240, 480 and 720 h respectively in salt spray test chamber. The corrosion rate was calculated by mass loss method, and the corrosion products were characterized by XRD and SEM. The effect of Cu on the corrosion process of low alloy wear-resistant steel was assessed by potentiodynamic measurement and electrochemical impedance spectroscopy(EIS). Results show that the corrosion product of low alloy wear-resistant steel composed mainly of γ-FeOOH, α-FeOOH,Fe_3O_4, γ-Fe_2O_3. The corrosion product in the early stage is loose and porous, but became better adhesive in the late stage. The corrosion rate of Cu bearing steels increases first and then decreases, however which is significantly lower than that of Cu-free steel. With the addition of Cu, the free-corrosion potential of the Cu-bearing steel increases, correspondingly, the electrochemical impedance, the capacitive arc on impedance spectra, and the charge transfer resistance are obviously enhanced, indicating that Cu can effectively enhance the corrosion resistance of the steel.
The effect of Cu on the corrosion resistance of low alloy wear-resistant steel in neutral salt spray environment was studied for 120, 240, 480 and 720 h respectively in salt spray test chamber. The corrosion rate was calculated by mass loss method, and the corrosion products were characterized by XRD and SEM. The effect of Cu on the corrosion process of low alloy wear-resistant steel was assessed by potentiodynamic measurement and electrochemical impedance spectroscopy(EIS). Results show that the corrosion product of low alloy wear-resistant steel composed mainly of γ-FeOOH, α-FeOOH,Fe_3O_4, γ-Fe_2O_3. The corrosion product in the early stage is loose and porous, but became better adhesive in the late stage. The corrosion rate of Cu bearing steels increases first and then decreases, however which is significantly lower than that of Cu-free steel. With the addition of Cu, the free-corrosion potential of the Cu-bearing steel increases, correspondingly, the electrochemical impedance, the capacitive arc on impedance spectra, and the charge transfer resistance are obviously enhanced, indicating that Cu can effectively enhance the corrosion resistance of the steel.
引文
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[2]Yao H,Zhou Y.Discussion on the important application of wear and wear resistant steel for coal machinery[J].Shandong Ind.Technol.,2014,(3):110(姚昊,周圆.浅谈煤炭机械的磨损及耐磨钢的重要应用[J].山东工业技术,2014,(3):110)
[3]Dai B Q.Analysis to abrasion and corrosion failure of mining machinery and prevention measures[J].Min.Process.Equip.,2008,36(2):44(戴葆青.矿山机械磨损与腐蚀失效分析及防护措施[J].矿山机械,2008,36(2):44)
[4]Mao W M,Ren H P.Investigation of new structural steel strengthened by Cu precipitation[J].Trans.Mater.Heat Treat.,1999,20(1):1(毛卫民,任慧平.新型铜析出强化结构钢的研究[J].金属热处理学报,1999,20(1):1)
[5]Han G,Xie Z J,Xiong L,et al.Evolution of nano-size precipitation and mechanical properties in a high strength-ductility low alloy steel through intercritical treatment[J].Mater.Sci.Eng.,2017,A705:89
[6]Zhou W H,Guo H,Xie Z J,et al.Copper precipitation and its impact on mechanical properties in a low carbon microalloyed steel processed by a three-step heat treatment[J].Mater.Des.,2014,63:42
[7]ТомашовНД,translated by Yu B N.Metal Corrosion Theory[M].Beijing:Science Press,1957(ТомашовНД著,余柏年译.金属腐蚀理论[M].北京:科学出版社,1957)
[8]Liu L H,Qi H B,Lu Y P,et al.A review on weathering steel research[J].Corros.Sci.Prot.Technol.,2003,15:86(刘丽宏,齐慧滨,卢燕平等.耐大气腐蚀钢的研究概况[J].腐蚀科学与防护技术,2003,15:86)
[9]Dünnwald J,Otto A.An investigation of phase transitions in rust layers using raman spectroscopy[J].Corros.Sci.,1989,29:1167
[10]Xie C S,Zhu C J,Hong C,et al.Salt spray accelerated corrosion test of 22MnCrNiMo steel for mooring chain[J].J.Jiangsu Univ.Sci.Technol.(Nat.Sci.Ed.),2011,25:224(谢春生,朱才进,洪昌等.22MnCrNiMo系泊链钢的盐雾加速腐蚀实验研究[J].江苏科技大学学报(自然科学版),2011,25:224)
[11]Yamashita M,Miyuki H,Matsuda Y,et al.ChemInform abstract:long term growth of the protective rust layer formed on weathering steel by atmospheric corrosion during a quarter of a century[J].ChemInform,1994,25:283
[12]Zhang Q C,Wu J S,Zheng W L,et al.Formation mechanism of protective rust on weathering steel[J].Corros.Sci.Prot.Technol.,2001,13:143(张全成,吴建生,郑文龙等.耐候钢表面稳定锈层形成机理的研究[J].腐蚀科学与防护技术,2001,13:143)
[13]Nie X H,Li Y L,Li J K,et al.Morphology,products and corrosion mechanism analysis of Q235 carbon steel in sea-shore salty soil[J].J.Mater.Eng.,2010,(8):24(聂向晖,李云龙,李记科等.Q235碳钢在滨海盐土中的腐蚀形貌、产物及机理分析[J].材料工程,2010,(8):24)
[14]Ishikawa T,Takeuchi K,Kandori K,et al.Transformation ofγ-FeOOH toα-FeOOH in acidic solutions containing metal ions[J].Colloids Surf.,2005,266A:155
[15]Ma L W,Wang X D,Chen X P,et al.Effect of Cu on the corrosion resistance of the carbon steel[J].Tianjin Metall.,2007,(5):21(马丽微,王向东,陈小平等.铜对碳钢耐大气腐蚀性能的影响[J].天津冶金,2007,(5):21)
[16]Wei B M.Metal Corrosion Theory and Application[M].Beijing:Chemical Industry Press,1984(魏宝明.金属腐蚀理论及应用[M].北京:化学工业出版社,1984)
[17]Cao C N.Silent Destruction:Metal Corrosion[M].Guangzhou:Jinan University Press,2000(曹楚南.悄悄进行的破坏-金属腐蚀[M].广州:暨南大学出版社,2000)
[18]Liu G C,Dong J H,Han E-H,et al.Influence of Cu and Mn on corrosion behavior of low alloy steel in a simulated coastal environment[J].Corros.Sci.Prot.Technol.,2008,20:235(刘国超,董俊华,韩恩厚等.Cu、Mn的协同作用对低合金钢在模拟海洋大气环境中腐蚀的影响[J].腐蚀科学与防护技术,2008,20:235)
[19]Wang F P,Kang W L,Jing H M.Corrosion Electrochemical Principle,Method and Application[M].Beijing:Chemical Industry Press,2008(王凤平,康万利,敬和民.腐蚀电化学原理、方法及应用[M].北京:化学工业出版社,2008)
[20]Feng H,Jiang H C,Rong L J,et al.Effect of Cu content on corrosion resistance of a high strength low alloy weathering steel[J].Corros.Sci.Prot.Technol.,2011,23:318(封辉,姜海昌,戎利建等.Cu对低合金高强耐候钢耐蚀性的影响[J].腐蚀科学与防护技术,2011,23:318)
[21]Ishii T,Ujiro T,Hamada E,et al.A mechanism of improvement in the corrosion resistance of ferritic stainless steels by Cu addition[J].Tetsu-to-Hagané,2011,97:441
[22]Dong J,Cui W F,Zhang S X,et al.Study on corrosion properties of fully immersed seawater in low alloy steel for marine engineering[A].2006 National Doctoral Academic Forum-Metallurgical Engineering Sub-forum[C].Shenyang,2006:187(董杰,崔文芳,张思勋等.海洋工程用低合金钢全浸海水腐蚀性能的研究[A].2006年全国博士生学术论坛-冶金工程分论坛论文集[C].沈阳,2006:187)
[23]Hao X C,Xiao K,Zhang H Q,et al.Influence of alloying elements Cu and Cr on the corrosion resistance of weathering steels in simulated ocean atmospheric environment[J].Mater.Prot.,2009,42(1):21(郝献超,肖葵,张汉青等.模拟海洋大气环境下Cu和Cr对耐候钢耐腐蚀性能的影响[J].材料保护,2009,42(1):21)
[24]Feng H.Effects of Cu,Cr and P on weathering steel of 355 MPa Grade[D].Shenyang:Northeastern University,2010(封辉.355 MPa级耐候钢中Cu、Cr和P元素的作用[D].沈阳:东北大学,2010)
[25]Xia X M,Xing L K,Song H Q,et al.Corrosion resistance of weathering steels in simulated south China sea atmospheric environment[J].Equip.Environ.Eng.,2018,15(3):39(夏昕鸣,邢路阔,宋泓清等.模拟南海大气环境下耐候钢腐蚀性能研究[J].装备环境工程,2018,15(3):39)
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