将水淬、空冷方式热处理的X80钢与供货状态（原始组织）X80钢相比较，用动电位极化曲线和动电位交流阻抗谱研究不同组织X80 钢在0.5 mol/L Na2CO3+1 mol/L NaHCO3高pH值土壤模拟溶液中的点蚀电化学行为。结果表明，水淬热处理后的X80钢更易钝化，点蚀敏感性低，但维钝电流较其他两种组织的都大；三种组织的X80钢极化电阻和电极表面状态常数n值随电位的变化规律基本一致，但水淬组织的n值在不同电位区间分别高于或低于其他两种组织；这些电化学行为的差异与不同组织试样表面钝化膜的非均匀性和致密程度有关；动电位极化法和动电位电化学阻抗谱法所得结论一致，腐蚀电流密度随电位的变化及电极极化电阻随电位变化都可用来反映电极的点蚀行为。
The different microstructure of X80 steel was obtained by heat treatment, water quenching and air cooling. The pitting electrochemical behavior of X80 pipeline steel with three different microstructure in 0.5 mol/L Na2CO3+1 mol/L NaHCO3 high pH soil simulative solution was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The results indicated that the corrosion inhibition of X80 steel after heat treatment became worse compared with original microstructure, but passivated easily；the law of Rp and n of three microstructures steel varying with potential is same, and n is bigger or lower in different potential ranges; the difference of microstructure caused by heat treament and the uniformity of passive films should be responsible to the different electrochemical behavior. The conclusion from potentiodynamic polarization curve is the same to the conclusion reached by electrochemical impedance spectroscopy.
参考文献
| [1] | |
| [2] | Lv Y M, Li Z W, Zhao W J. The welding technology of X80 pipeline steel [J]. Oil-Gasfield, 2008, 27(9): 53-57[2](吕彦民，李作文，赵文杰．X80钢管道焊接技术 [J]．油气田地面工程，2008，27(9)：53-57)[3]Huang Z Q. The application and development prospect of grade X80 pipeline steel in high pressure large volume gas transmission pipeline [J]. Welded Pipe and Tube, 2005, 28(2): 1-9[4] 黄志潜. X80管线钢在高压大流量输气管道上的应用与发展前景 [J]. 焊管, 2005, 28(2):1-9 [5]Li X G, Du C W, Dong C F，et al. Study on the Corrosion Behavior of X70 Pipe Line Steel [M]. Beijing: Science Press, 2006[6](李晓钢，杜翠薇，董超芳等．X70钢的腐蚀行为与试验研究 [M]．北京: 科学出版社，2006)[7] Du C W, Li X. G, Liang PEffect of microstructure on corrosion of X70 pipe steel in an alkaline soil [J]. J. Mater. Eng. Perform, 2009, 18(2):216-220 [8] Liu Z Y, Li X. G, Du C W，et alStress corrosion cracking behavior of X70 pipe steel in an acidic soil environment [J]. Corros. Sci, 2008, 50(8):2251-2257[9] Liu Z Y, Li X G, Du C W. Effect of inclusions on initiation of stress corrosion cracks in X70 pipeline steel in an acidic soil environment [J]. Corros. Sci, 2009, 51(4):895-900[10]Huang F, Liu J, Lin C, et al.Electrochemical behavior of different microstructure of X80 pipeline steel in simulated Dagang soil solution [J]. Corros. Prot., 2010, 31(2): 1-5[11](黄峰，刘静，林超等．不同组织X80钢在大港盐碱土模拟溶液中的腐蚀电化学行为[J]．腐蚀与防护，2010, 31(2): 1-5)[12]Liu Z Y. Stress corrosion cracking behavior of X70 pipe steel in an acidic soil environment [D].Beijing: University of Science & |
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