碳化物及合金元素对酸液膜中晶粒腐蚀形态的影响
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摘要
选用10#钢、65#钢和W6Mo5Cr4V2Al钢为实验材料,利用光学显微镜、扫描电镜和电子探针对其在酸性环境中腐蚀后的晶粒微观形貌和合金元素的分布进行观察分析,考察合金元素和碳化物的存在形式对晶粒腐蚀形态的影响.结果表明,晶粒的腐蚀形貌与碳化物分布有关,钢中碳元素以固溶形式存在或钢中添加Cr,Al元素,可显著提高钢的耐酸蚀性;在以电化学腐蚀为主的酸性环境中,组织中各相电极电位的高低才是晶粒是否易被腐蚀的本质;晶界是否易被腐蚀也主要与晶界处物相的电极电位高低有关.
Taking the steels#10,#65 and W6 Mo5Cr4V2Al as experimental materials,the grain microstructure and alloying element distribution after corrosion treatment in acid environment were observed and analyzed by optical microscope,scanning electron microscope and electron probe.The effects of existing forms of carbides and alloying elements on the grain corrosion morphology in these steels were also studied. The results showthat the corrosion morphology of grains is related to distribution of carbides in steel and that C in the form of solid solution and Cr,Al added in steel can significantly improve the corrosion resistance of the steel. In acid environment with electrochemical corrosion,the electrode potential level of each phase in microstructure is the essence that determines whether or not the grains are liable to be corroded,while grain boundary is apt to be corroded or not is also mainly related to the electrode potential level of phases at grain boundary.
Taking the steels#10,#65 and W6 Mo5Cr4V2Al as experimental materials,the grain microstructure and alloying element distribution after corrosion treatment in acid environment were observed and analyzed by optical microscope,scanning electron microscope and electron probe.The effects of existing forms of carbides and alloying elements on the grain corrosion morphology in these steels were also studied. The results showthat the corrosion morphology of grains is related to distribution of carbides in steel and that C in the form of solid solution and Cr,Al added in steel can significantly improve the corrosion resistance of the steel. In acid environment with electrochemical corrosion,the electrode potential level of each phase in microstructure is the essence that determines whether or not the grains are liable to be corroded,while grain boundary is apt to be corroded or not is also mainly related to the electrode potential level of phases at grain boundary.
引文
[1]Ma Y,Li Y,Wang F.Corrosion of lowcarbon steel in atmospheric environments of different chloride content[J].Corrosion Science,2009,51(5):997-1006.
[2]Fu A Q,Tang X,Cheng Y F.Characterization of corrosion of X70 pipeline steel in thin electrolyte layer under disbonded coating by scanning Kelvin probe[J].Corrosion Science,2009,51(1):186-190.
[3]Thee C,Hao L,Dong J,et al.Atmospheric corrosion monitoring of a weathering steel under an electrolyte film in cyclic wet-dry condition[J].Corrosion Science,2014,78(1):130-137.
[4]Hao L,Zhang S,Dong J,et al.Evolution of atmospheric corrosion of M n Cu P weathering steel in a simulated coastalindustrial atmosphere[J].Corrosion Science,2012,59:270-276.
[5]Clover D,Kinsella B,Pejcic B,et al.The influence of microstructure on the corrosion rate of various carbon steels[J].Journal of Applied Electrochemistry,2005,35(2):139-149.
[6]Lewis A C,Bingert J F,Rowenhorst D J,et al.Two-and three-dimensional microstructural characterization of a superaustenitic stainless steel[J].Materials Science and Engineering:A,2006,418(1):11-18.
[7]Kina A Y,Souza V M,Tavares S S M,et al.Influence of heat treatments on the intergranular corrosion resistance of the AISI 347 cast and weld metal for high temperature services[J].Journal of Materials Processing Technology,2008,199(1/2/3):391-395.
[8]崔忠析.金属学与热处理[M].北京:机械工业出版社,2009:112.(Cui Zhong-xi.Metallography and heat treatment[M].Beijing:China M achine Press,2009:112.)
[9]郝雪卉,董俊华,魏洁,等.AH32耐蚀钢显微组织对其腐蚀行为的影响[J].金属学报,2012,48(5):534-540.(Hao Xue-hui,Dong Jun-hua,Wei Jie,et al.Influence of microstructure of AH32 corrosion resistant steel on corrosion behavior[J].Acta Metallurgica Sinica,2012,48(5):534-540.)
[10]王力伟,杜翠薇,刘智勇,等.Fe3C和珠光体对低碳铁素体钢腐蚀电化学行为的影响[J].金属学报,2011,47(10):1227-1232.(Wang Li-wei,Du Cui-wei,Liu Zhi-yong,et al.Influences of Fe3C and pearlite on the electrochemical corrosion behaviors of lowcarbon ferrite steel[J].Acta Metallurgica Sinica,2011,47(10):1227-1232.)
[11]王增娣,闫永贵,马力,等.高纯锌参比电极电位稳定性研究[J].腐蚀与防护,2006,27(9):450-453.(Wang Zeng-di,Yan Yong-gui,Ma Li,et al.Potential stability of 99.999 9%high purity zinc reference electrode[J].Corrosion&Protection,2006,27(9):450-453.)
[12]谢建治,张书廷,赵新华.不同因素对三维电极体系电极电位的影响[J].天津大学学报,2005,38(7):644-648.(Xie Jian-zhi,Zhang Shu-ting,Zhao Xin-hua.Effects of different factors on electrode potential of three-dimensional electrode system[J].Journal of Tianjin University,2005,38(7):644-648.)
[13]Karma A,Rappel W J.Quantitative phase-field modeling of dendritic growth in two and three dimensions[J].Physical Review:E,1998,57(4):4323-4349.
[14]Karma A,Rappel W J.Numerical simulation of threedimensional dendritic growth[J].Physical ReviewLetters,1996,77(4):753-756.
[15]Ben-Jacob E,Goldenfeld N,Langer J S,et al.Boundary-layer model of pattern formation in solidification[J].Physical Review:A,1984,29(1):330-340.
[2]Fu A Q,Tang X,Cheng Y F.Characterization of corrosion of X70 pipeline steel in thin electrolyte layer under disbonded coating by scanning Kelvin probe[J].Corrosion Science,2009,51(1):186-190.
[3]Thee C,Hao L,Dong J,et al.Atmospheric corrosion monitoring of a weathering steel under an electrolyte film in cyclic wet-dry condition[J].Corrosion Science,2014,78(1):130-137.
[4]Hao L,Zhang S,Dong J,et al.Evolution of atmospheric corrosion of M n Cu P weathering steel in a simulated coastalindustrial atmosphere[J].Corrosion Science,2012,59:270-276.
[5]Clover D,Kinsella B,Pejcic B,et al.The influence of microstructure on the corrosion rate of various carbon steels[J].Journal of Applied Electrochemistry,2005,35(2):139-149.
[6]Lewis A C,Bingert J F,Rowenhorst D J,et al.Two-and three-dimensional microstructural characterization of a superaustenitic stainless steel[J].Materials Science and Engineering:A,2006,418(1):11-18.
[7]Kina A Y,Souza V M,Tavares S S M,et al.Influence of heat treatments on the intergranular corrosion resistance of the AISI 347 cast and weld metal for high temperature services[J].Journal of Materials Processing Technology,2008,199(1/2/3):391-395.
[8]崔忠析.金属学与热处理[M].北京:机械工业出版社,2009:112.(Cui Zhong-xi.Metallography and heat treatment[M].Beijing:China M achine Press,2009:112.)
[9]郝雪卉,董俊华,魏洁,等.AH32耐蚀钢显微组织对其腐蚀行为的影响[J].金属学报,2012,48(5):534-540.(Hao Xue-hui,Dong Jun-hua,Wei Jie,et al.Influence of microstructure of AH32 corrosion resistant steel on corrosion behavior[J].Acta Metallurgica Sinica,2012,48(5):534-540.)
[10]王力伟,杜翠薇,刘智勇,等.Fe3C和珠光体对低碳铁素体钢腐蚀电化学行为的影响[J].金属学报,2011,47(10):1227-1232.(Wang Li-wei,Du Cui-wei,Liu Zhi-yong,et al.Influences of Fe3C and pearlite on the electrochemical corrosion behaviors of lowcarbon ferrite steel[J].Acta Metallurgica Sinica,2011,47(10):1227-1232.)
[11]王增娣,闫永贵,马力,等.高纯锌参比电极电位稳定性研究[J].腐蚀与防护,2006,27(9):450-453.(Wang Zeng-di,Yan Yong-gui,Ma Li,et al.Potential stability of 99.999 9%high purity zinc reference electrode[J].Corrosion&Protection,2006,27(9):450-453.)
[12]谢建治,张书廷,赵新华.不同因素对三维电极体系电极电位的影响[J].天津大学学报,2005,38(7):644-648.(Xie Jian-zhi,Zhang Shu-ting,Zhao Xin-hua.Effects of different factors on electrode potential of three-dimensional electrode system[J].Journal of Tianjin University,2005,38(7):644-648.)
[13]Karma A,Rappel W J.Quantitative phase-field modeling of dendritic growth in two and three dimensions[J].Physical Review:E,1998,57(4):4323-4349.
[14]Karma A,Rappel W J.Numerical simulation of threedimensional dendritic growth[J].Physical ReviewLetters,1996,77(4):753-756.
[15]Ben-Jacob E,Goldenfeld N,Langer J S,et al.Boundary-layer model of pattern formation in solidification[J].Physical Review:A,1984,29(1):330-340.