|
|
|
| Electrochemical Behavior of X80 Steel Covered by A Rust Layer Formed after Short-term Corrosion |
| LIANG Ping, WANG Ying |
| School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, China |
|
|
|
|
Abstract A rust layer was formed on X80 pipeline steel in Yingtan acid soil simulated solution for 30 d, and the micrographs and element compositions of this rust layer were investigated by using SEM, EDS, and XRD. The electrochemical corrosion behavior of the X80 steel with short-term rust layer was investigated by means of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. The results showed that, as compared with the X80 steel, the X80 steel with the rust layer possessed more negative free corrosion potential and larger free corrosion current density. This is because that short-term rust layer was composed of Fe3O4 and β-FeOOH, had a great number of microcracks and microvoids, which provided the sites for adsorbing of Cl- in the simulated solution. Moreover, these defects also increased the effective reaction areas for corrosion reactions. β-FeOOH could not prevent aggressive ions from inward penetration, and was reduced in the cathodic sites. These factors resulted in increasing of the corrosion rate of X80 steel with pre-formed rust layer in acid soil simulated solution.
|
|
|
|
|
[1] Li H L. Research development trends and prospects of steel tube for transmission pipeline of oil and gas [J]. Weld. Pipe Tube, 2004, 27(6): 1-11
(李鹤林. 油气输送钢管的发展动向与展望 [J]. 焊管, 2004, 27(6): 1-11)
[2] Kong J H, Guo B, Liu C M, et al. Research and development of high strength pipeline steel X80 [J]. Mater. Rev., 2004, 18(4): 23-27
(孔君华, 郭斌, 刘昌明等. 高钢级管线钢X80的研制与发展 [J]. 材料导报, 2004, 18(4): 23-27)
[3] Chen X, Du C W, Li X G, et al. Influences of soil water content on corrosion behavior of X70 steel in Yingtan acidic soil [J]. J. Petrochem. Univ., 2007, 20(4): 55-58
(陈旭, 杜翠薇, 李晓刚等. 含水率对X70 钢在鹰潭酸性土壤中腐蚀行为的影响 [J]. 石油化工高等学校学报, 2007, 20(4): 55-58)
[4] Tian L, Lv X Y, Wu D K. Welding training of the second west-east gas transportation pipeline project [J]. Elec. Weld. Mach., 2009, 39(5): 124-126
(田丽, 吕向阳, 吴大可. 西气东输二线管道工程焊工培训 [J]. 电焊机, 2009. 39(5): 124-126)
[5] Liu Z Y, Wang C P, Du C W, et al. Effect of applied potentials on stress corrosion cracking of X80 pipeline steel in simulated Yingtan soil solution [J]. Acta Metall. Sin., 2011, 47(11): 1434-1439
(刘智勇, 王长鹏, 杜翠薇等. 外加电位对X80管线钢在鹰潭酸性土壤模拟溶液中应力腐蚀行为的影响 [J]. 金属学报, 2011, 47(11): 1434-1439)
[6] Chen X, Wu M, He C, et al. The cyclic voltammogram behaviors of welded X80 pipeline in Yingtan simulated soil solution [J]. J. Petrochem. Univ., 2010, 23(3): 62-67
(陈旭, 吴明, 何川等. X80钢及其焊缝在鹰潭土壤模拟溶液中的循环伏安行为 [J]. 石油化工高等学校学报, 2010, 23(3): 62-67)
[7] Liu Z Y, Li X G, Zhang Y R, et al. Relationship between electrochemical characteristics and SCC of X70 pipeline steel in an acidic soil simulated solution [J]. Acta Metall. Sin. (Engl. Lett.), 2009, 22(1): 58-64
[8] Wang F P, Kang W L, Jing H M. Fundaments, Methods and Applications of Corrosion Electrochemical [M]. Beijing: Chemical Industry Press, 2008, 218
(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, 218)
[9] Cao C N, Zhang J Q. An Introduction to Electrochemical Impedance Spectroscopy [M]. Beijing: Science Press, 2002, 46
(曹楚南, 张鉴清. 电化学阻抗谱导论 [M]. 北京: 科学出版社, 2002, 46)
[10] Rubinstein I, Sabatanie E, Rishpon J. Electrochemical impedance analysis of polyaniline films on electrodes [J]. J. Electrochem. Soc., 1987, 134(12): 3078-3083
[11] Li Q X, Wang Z Y, Han W, et al. Characterization of the rust formed on weathering steel exposed to Qinghai salt lake atmosphere [J]. Corros. Sci., 2008, 50(2): 365-371
[12] Sun M, Xiao K, Dong C F, et al. Electrochemical behaviors of ultra high strength steels with corrosion products [J]. Acta Metall. Sin., 2011, 47(4): 442-448
(孙敏, 肖葵, 董超芳等. 覆腐蚀产物超高强度钢的电化学行为 [J]. 金属学报, 2011, 47(4): 442-448)
[13] Ohtsukat T, Komatsu T. Enhancement of electric conductivity of the rust layer by adsorption of water [J]. Corros. Sci., 2005, 47(10): 2571-2577
[14] Zhao G X, Chen C F, Lu M X, et al. The formation of product scale and mass transfer channels during corrosion [J]. J. Chin. Soc. Corros. Prot., 2002, 22(6): 200-204
(赵国仙, 陈长风, 路民旭等. CO2腐蚀的产物膜及膜中物质交换通道的形成 [J]. 中国腐蚀与防护学报, 2002, 22(6): 200-204)
[15] Zhang L J. The studies of the corrosion mechanism of X70 pipeline steel in the neutral solutions and its surface protection methods [D]. Hangzhou: Zhejing University, 2005
(张丽君. X70管线钢在中性介质中的腐蚀机理及其表面处理方法的研究 [D]. 杭州: 浙江大学, 2005)
[16] Zeng Y M, Luo J L. Electronic band structure of passive film on X70 pipeline steel [J]. Electrochim. Acta, 2003, 48(23): 3551-3562 |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
