Abstract: An accelerated buried coupon test coupled with electrochemical impedance spectroscopy and microanalysis was conducted to research the effect of chloride ions (Cl-) on soil corrosion mechanism, corrosion layer structure and corrosion products. The main conclusions are as follows. (1) Localized corrosion was the main corrosion type, and the corrosion rate and pitting depth of ductile iron increased with the increasing of Cl- content; the pitting depth and corrosion time presented a power function relationship, and the local corrosion was especially serious when the Cl- content was higher than 0.515%. (2) Three stages were observed during ductile iron corrosion: pitting induction stage, pitting developmental stage, and stable corrosion stage; charge transfer was the control step in the first two stages and oxygen mass diffusion turned to be the key step in the third stage. (3) Iron oxides and iron oxyhydroxides were main crystal minerals; β-FeOOH and ferrous oxychlorides appeared in high Cl- environment accelerated the electrochemical corrosion of ductile iron.
1 Wang H W, Shen S M, Yu X C. Review on research methods of soil corrosion for buried pipeline steels[J]. J Nanjing University of Technology:Nat Sci Ed,2008,30(4):105(in Chinese). 王和文,沈士明,於孝春.埋地管道钢土壤腐蚀研究方法进展[J].南京工业大学学报,2008,30(4):105. 2 Li J H, Zhang Y, et al. Water supply ductile pipe and tube rupture reason analysis[J]. Heat Treat Met,2011(S1):351(in Chinese). 李家华,张颖,等.供水球墨铸铁管及管件破裂原因分析[J].金属热处理,2011(S1):351. 3 Yang J, et al. Trend of development of piping material of water supply[J]. Heilongjiang Environmental J,2002, 26(2):8(in Chinese). 杨锦,等.论给水管材发展的新趋向[J].黑龙江环境通报,2002,26(2):8. 4 Huang F, Yu L, Liu J, et al. Relative function of influence factors on pitting sensitivity of X70 steel in a simulated soil solution[J]. Corros Sci Protection Technol,2010,22(3):166(in Chinese). 黄峰,余璐,刘静,等.X70钢在模拟土壤溶液中点蚀敏感性影响因素交互作用研究[J].腐蚀科学与防护技术,2010,22(3):166. 5 Du N, Ye C, Tian W M, et al. 304 stainless steel pitting behavior by means of electrochemical impedance spectroscopy[J]. J Mater Eng,2014(6):68(in Chinese). 杜楠,叶超,田文明,等.304不锈钢点蚀行为的电化学阻抗谱研究[J].材料工程,2014(6):68. 6 Shi Y H, Yu Y, Liang P, et al. Corrosion behaviors of 316L stainless steel in chloride ion environment[J]. Mater Protection,2015, 48(8):29(in Chinese). 史艳华,于洋,梁平,等.316L不锈钢在氯离子环境中的腐蚀行为[J].材料保护,2015,48(8):29. 7 Gao Y. Study on chloride ion corrosion behaviors of long-distance pipeline[D]. Xi’an: Xi’an Shiyou University, 2013(in Chinese). 高英.长输管线氯离子腐蚀行为研究[D].西安:西安石油大学,2013. 8 Du X Y, et al. Influence of Cl- concentration in soil on the corrosion rate[J]. Guangdong Chem Ind,2001, 38(9):41(in Chinese). 杜新燕,等.氯离子浓度对土壤腐蚀速率的影响[J].广东化工,2001,38(9):41. 9 Maslehuddin M, Al-Zahrani M M, Ibrahim M, et al. Effect of chloride concentration in soil on reinforcement corrosion[J]. Constr Build Mater,2007,21(8):1825. 10 Li Y Q, Li J, Cai D C. Electrochemical study on the corrosion behavior of X70 steel in soil with different Cl-[J]. J China West Normal University:Nat Sci,2008,29(1):93(in Chinese). 李永强,李江,蔡铎昌.土壤中氯离子对X70钢腐蚀影响的电化学研究[J].西华师范大学学报,2008,29(1):93. 11 Ma Y, et al. Corrosion of low carbon steel in atmospheric environments of different chloride content[J]. Corros Sci,2009, 51(5):997. 12 Alizadeh M, et al. The influence of microstructure on the protective properties of the corrosion product layer generated on the welded API X70 steel in chloride solution[J]. Corros Sci,2013,70(3):170. 13 Gadala I M, Alfantazi A. Electrochemical behavior of API-X100 pipeline steel in NS4, near-neutral, and mildly alkaline pH simulated soil solutions[J]. Corros Sci,2014,82(5):45. 14 Yin G Q, Zhang L H, Chang S W, et al. A brief introduction of methods used in soil corrosion researches[J]. Corros Sci Protection Technol,2004,16(6):367(in Chinese). 尹桂勤,张莉华,常守文,等.土壤腐蚀研究方法概述[J].腐蚀科学与防护技术,2004,16(6):367. 15 Xie Y, Li Y, Sun T, et al. Study on the protection performance of γ-FeOOH and α-FeOOH formed in-situ on Q235[J]. Chinese Sci Bull,2008(23):2848(in Chinese). 谢颖,李瑛,孙挺,等.原位生长的纯γ-FeOOH和α-FeOOH锈膜对Q235钢保护性能的研究[J].科学通报,2008(23):2848. 16 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(in Chinese). 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. 17 Yang F, Shi B Y, Gu J, et al. Morphological and physicochemical characteristics of iron corrosion scales formed under different water source histories in a drinking water distribution system[J]. Water Res,2012,46(16):5423. 18 Nishimura T, Noda K, Kodama T, et al. Electrochemical behavior of rust formed on carbon steel in a wet/dry environment containing chloride ions[J]. Corrosion,2000,56(9):935. 19 Kamimura T, Hara S, Miyuki H, et al. Composition and protective ability of rust layer formed on weathering steel exposed to various environments[J]. Corros Sci,2006,48(9):2799. 20 Refait P, Génin J M R. The mechanisms of oxidation of ferrous hydroxychloride β-Fe2(OH)3Cl in aqueous solution: The formation of akaganeite vs goethite[J]. Corros Sci,1997,39(3):539. 21 Neff D, Dillmann P, Bellot-Gurlet L, et al. Corrosion of iron archaeo-logical artefacts in soil: Characterisation of the corrosion system[J]. Corros Sci,2005,47(2):515. 22 Wei D, Xiao K, Chen C F, et al. Localized electrochemical impe-dance spectroscopy of the corrosion behavior of carbon steel in the alkaline solutions with Cl- and SO42-[J]. Sci Technol Rev,2013,31(20):43(in Chinese). 魏丹,肖葵,陈长风,等.碳钢在含Cl-和SO42-碱性溶液中腐蚀规律的局部交流阻抗[J].科技导报,2013,31(20):43. 23 Xu C M. Corrosion electrochemical characteristics of X80 pipeline steel in southwest area soil[J]. J Iron Steel Res,2001,23(9):25(in Chinese). 胥聪敏.X80管线钢在西南地区土壤中的腐蚀电化学特征[J].钢铁研究学报,2001,23(9):25. 24 Zhao W M, Wang Y, Xue J, et al. EIS study of the corrosion failure process of steel coated by nickel base alloy[J]. Acta Metall Sin, 2005,41(2):178(in Chinese). 赵卫民,王勇,薛锦,等.镍基合金涂层包覆钢腐蚀失效过程的电化学阻抗谱研究[J].金属学报,2005,41(2):178. 25 Ma Y, Li Y, Wang F. The effect of β-FeOOH on the corrosion behavior of low carbon steel exposed in tropic marine environment[J]. Mater Chem Phys,2008,112(3):844. 26 Antony H, Perrin S, Dillmann P, et al. Electrochemical study of indoor atmospheric corrosion layers formed on ancient iron artifacts[J]. Electrochim Acta,2007,52(27):7754.
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2017, Vol. 31 
