低合金高强度钢的耐模拟工业大气腐蚀行为研究
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摘要
选择Q345E和Cr-Ni-Cu两种典型的低合金高强度钢,在0.052%(质量分数) NaHSO_3水溶液中进行极化实验和间浸挂片实验,比较了两种钢的腐蚀速率,评价了两种钢的耐蚀性。利用SEM和XRD分析两种钢的腐蚀形貌,锈层结构及其相组成。结果表明,Q345E和Cr-Ni-Cu钢的腐蚀电位分别为-730和-705 mV;两种钢的腐蚀锈层物相均含有γ-FeO(OH)和少量的α-Fe,随腐蚀时间延长,存在少量α-FeO(OH)和Fe_3O_4。Cr-Ni-Cu钢相比Q345E钢,其腐蚀速率较低,Cr,Ni和Cu等元素的存在提高了其耐蚀性能;Cr-Ni-Cu钢的表面锈层比Q345E钢更加致密,锈层微裂纹更少。
The corrosion resistance of Q345E and Cr-Ni-Cu steels was comparatively assessed by means of potentiodynamic polarization and cyclic immersion corrosion tests in 0.052%(mass fraction) NaHSO_3 solution, which aims to simulate the common SO_2-containing atmosphere. The characteristic of corrosion rust was studied by means of scanning electron microscope(SEM) and X-ray diffraction(XRD). Results show that the open circuit corrosion potential of Q345E and Cr-Ni-Cu steel are-730 and-705 m V, respectively. The rust layers of two steels contain γ-FeO(OH) and α-Fe phase. Some α-FeO(OH) and Fe_3O_4 products generate with increasing of the corrosion time. Compared with Q345E steel, the Cr-Ni-Cu steel has lower corrosion rate due to the formation of a much more compact rust layer containing elements such as Cr, Ni and Cu, which are beneficial to corrosion resistance.
The corrosion resistance of Q345E and Cr-Ni-Cu steels was comparatively assessed by means of potentiodynamic polarization and cyclic immersion corrosion tests in 0.052%(mass fraction) NaHSO_3 solution, which aims to simulate the common SO_2-containing atmosphere. The characteristic of corrosion rust was studied by means of scanning electron microscope(SEM) and X-ray diffraction(XRD). Results show that the open circuit corrosion potential of Q345E and Cr-Ni-Cu steel are-730 and-705 m V, respectively. The rust layers of two steels contain γ-FeO(OH) and α-Fe phase. Some α-FeO(OH) and Fe_3O_4 products generate with increasing of the corrosion time. Compared with Q345E steel, the Cr-Ni-Cu steel has lower corrosion rate due to the formation of a much more compact rust layer containing elements such as Cr, Ni and Cu, which are beneficial to corrosion resistance.
引文
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[2]Zhou W H,Xie Z J,Guo H,et al.Regulation of multi-phase micro‐structure and mechanical properties in a 700 MPa grade low carbon low alloy steel with good ductility[J].Acta Metall.Sin.,2015,51:407(周文浩,谢振家,郭晖等.700 MPa级高塑低碳低合金钢的多相组织调控及性能[J].金属学报,2015,51:407)
[3]Li J,Zhang X Z,Liu J S.Static recrystallization models of low-al‐loy Q345E steel[J].Heavy Cast.Forg.,2014,(1):14(李佳,张秀芝,刘建生.低合金钢Q345E静态再结晶模型研究[J].大型铸锻件,2014,(1):14)
[4]Cai H C.Electrochemical testing method of low alloy steel in atmo‐spheric corrosion[J].Res.Iron Steel,1986,39(2):29(蔡慧超.低合金钢大气腐蚀电化学测试方法[J].钢铁研究,1986,39(2):29)
[5]Han W,Wang J,Wang Z Y,et al.Study on atmospheric corrosion of low alloy steels[J].J.Chin.Soc.Corros.Prot.,2004,24:147(韩薇,汪俊,王振尧等.碳钢与低合金钢耐大气腐蚀规律研究[J].中国腐蚀与防护学报,2004,24:147)
[6]Tewary N K,Kundu A,Nandi R,et al.Microstructural characterisa‐tion and corrosion performance of old railway girder bridge steel and modern weathering structural steel[J].Corros.Sci.,2016,113:57
[7]Guo M X,Pan C,Wang Z Y,et al.A study on the initial corrosion behavior of carbon steel exposed to a simulated coastal-industrial at‐mosphere[J].Acta Metall.Sin.,2018,54:65(郭明晓,潘晨,王振尧等.碳钢在模拟海洋工业大气环境中初期腐蚀行为研究[J].金属学报,2018,54:65)
[8]Urban V,Krivy V,Kubzova M.Development of corrosion processes on weathering railway bridge[J].Proced.Eng.,2017,190:275
[9]Morcillo M,Chico B,Díaz I,et al.Atmospheric corrosion data of weathering steels.A review[J].Corros.Sci.,2013,77:6
[10]Mi F Y.The effect of rare earth on industrial and sea atmosphere corrosion resistance for low alloy steel[D].Kunming:Kunming University of Science and Technology,2011(米丰毅.稀土对低碳结构钢耐工业及海洋大气腐蚀性能的影响研究[D].昆明:昆明理工大学,2011)
[11]Ma X Y,Wang X Y,Qu Z Y,et al.Comparison of several different models in atmospheric corrosion prediction[J].J.Univ.Sci.Tech‐nol.Beijing,2000,22:145(马小彦,汪轩义,屈祖玉等.几种不同大气腐蚀预测模型的比较[J].北京科技大学学报,2000,22:145)
[12]Yu Q,Dong C F,Fang Y H,et al.Atmospheric corrosion of Q235carbon steel and Q450 weathering steel in Turpan,China[J].J.Iron Steel Res.Int.,2016,23:1061
[13]Wu Z F,Song Y Q,Feng Y F,et al.Study on corrosion behavior of low alloy high strength weathering steel in simulated industrial at‐mosphere under wet and dry alternating condition[J].Hot Work.Technol.,2017,46(12):104(吴志锋,宋义全,冯宇飞等.低合金高强度耐候钢在干湿交替环境下模拟工业大气的腐蚀行为研究[J].热加工工艺,2017,46(12):104)
[14]Cao G L,Li G M,Chen S,et al.Comparison on pitting corrosion resistance of nickel and chromium in typical sea water resistance steels[J].Acta Metall.Sin.,2010,46:748(曹国良,李国明,陈珊等.典型耐海水腐蚀钢中Ni和Cr耐点蚀作用的比较[J].金属学报,2010,46:748)
[15]Choi Y S,Shim J J,Kim J G.Corrosion behavior of low alloy steels containing Cr,Co and W in synthetic potable water[J].Ma‐ter.Sci.Eng.,2004,A385:148
[16]Ke W,Dong J H.Study on the rusting evolution and the perfor‐mance of resisting to atmospheric corrosion for Mn-Cu steel[J].Acta Metall.Sin.,2010,46:1365(柯伟,董俊华.Mn-Cu钢大气腐蚀锈层演化规律及其耐候性的研究[J].金属学报,2010,46:1365)
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