用线性极化法(LPR)研究了3Cr管线钢在高温高压CO2腐蚀环境下的腐蚀速率, 利用电化学阻抗谱(EIS)结合SEM与EDS研究了腐蚀不同时间的腐蚀产物膜. 利用EIS监测到腐蚀产物膜中出现二次富Cr程度低的内层膜, 并对其进行了分析. 结果表明, 腐蚀产物膜分为向基体内部原位生长的非晶富Cr层与腐蚀后期在其上沉积的FeCO3晶粒层两部分, 腐蚀膜内含Cr化合物的不断富集和致密度的提高, 是腐蚀速率持续下降的主因; 含Cr化合物的成膜需要一定的Cr3+浓度; 由于3Cr管线钢的点蚀源处的局部腐蚀速率较快, 导致Cr3+局部富集成膜, 使点蚀源内腐蚀产物膜Cr/Fe比远高于周围, 从而抑制了蚀坑的发展.
Linear polarisation resistance (LPR) was used to trace the corrosion rate of 3Cr pipe line steel during corrosion process. EIS and SEM were used to detect the structure of protective CO2 corrosion product films. The appearance and evolvement of the loose internal–layer with lower Cr/Fe ration which was observed by SEM, was analyzed by EIS. Amorphous corrosion product film grew from outside to inside with time. The increase of the Cr/Fe ratio and the thickness of the film cause the decrease of momentary corrosion rate. The chromic compound produced by a certainty Cr3+ concentration. When the pitting corrosion suppressed, high corrosion rate in the pit resulted in high Cr3+ concentration which would produce much chromic compound, and in this way, the development of the pit would be prevented.
[1] Inaba H, Kimura M, Yokokawa H. Corros Sci, 1996; 38: 1449
[2] Nyborg R, Dugstad A. 53rd NACE Annual Conf. Houston: NACE, 1998: 98029
[3] Takabe H, Ueda M. 56th NACE Annual Conf. Houston: NACE, 2001: 01066
[4] Wang X F, Dong Z J, Liang Y J. Corros Sci Prot Technol, 2006; 18: 436
(王献昉, 董振江, 梁拥军. 腐蚀科学与防护技术, 2006; 18: 436)
[5] Kermani M B, Gonzales J C, Linne C. 56th NACE Annual Conf. Houston: NACE, 2001: 1065
[6] Nice P I, Takabe H, Ueda M. 55th NACE Annual Conf. Houston: NACE, 2000: 154
[7] Pigliacampo L, Gonzales J C, Turconi G L. 61st NACE Annual Confer. Houston: NACE, 2006: 06133
[8] Ueda M, Ikeda A. 51st NACE Annual Conf. Houston: NACE, 1996: 96013
[9] Nice P I, Ueda M. 53rd NACE Annual Conf. Houston: NACE, 1998: 98003
[10] Chen C F, Lu M X, Zhao G X. Acta Metall Sin, 2002; 38: 411
(陈长风, 路民旭, 赵国仙. 金属学报, 2002; 38: 411)
[11] Kermani M B, Gonzales J C, Edmonds D, Dicken G, Scoppio L. 58th NACE Annual Conf. Houston: NACE, 2003:03116
[12] Kermani M B, Gonzales J C, Turconi G L, Perez T, Morales C. 59th NACE Annual Conf. Houston: NACE, 2004: 04111
[13] Wei B M. Metallic Corrosion Theories and Application. Beijing: Chemical Industry Press, 1984: 83
(魏宝明. 金属腐蚀理论及应用. 北京: 化学工业出版社, 1984: 83)
[14] Kimura M, Saito Y, Yoshifumi Y. 49th NACE Annual Conf. Houston: NACE, 1994: 94018
[15] Sun J B, Liu W, Chang W, Zhang Z H, Li Z T, Yu T, Lu M X. Acta Metall Sin, 2009; 45: 86
(孙建波, 柳伟, 常炜, 张忠铧, 李忠涛, 于湉, 路民旭.金属学报, 2009; 45: 86)
[16] Zhang G A, Lu M X, Wu Y S. Chin J Mater Res, 2005;19: 537
(张国安, 路民旭, 吴荫顺. 材料研究学报, 2005; 19: 537)
[17] Zhang G A, Lu M X, Wu Y S. J Univ Sci Technol, 2007;29B: 1219
(张国安, 路民旭, 吴荫顺. 北京科技大学学报, 2007; 29B: 1219)
[18] Cao C N, Zhang J Q. An Introduction to Electrochemical Impedance Spectroscopy. Beijing: Science Press, 2002: 162
(曹楚南, 张鉴清. 电化学阻抗谱导论. 北京: 科学出版社, 2002: 162)
[19] Chen C F, Lu M X, Zhao G X, Bai Z Q, Yan M L, Yan Y Q. Acta Metall Sin, 2002; 38: 771
(陈长风, 路民旭, 赵国仙, 白真权, 严密林, 杨延清. 金属学报, 2002; 38: 771)
[20] Zhang G A, Cheng Y F. Corros Sci, 2009; 51: 90
[21] Farelas F, Galicia M, Brown B, Nesic S, Castaneda H. Corros Sci, 2010; 52: 514
[22] Zhang G A, Cheng Y F. Corros Sci, 2009; 51: 1595
[23] Lopez D A, Simison S N, Sanchez S R. Corros Sci, 2005; 47: 750
[24] Yang D J, Shen Z S. Corrosion Science of Metal. 2nd Ed. Beijing: Metallurgy Industry Press, 1999: 124
(杨德钧, 沈卓身. 金属腐蚀学. 第2版. 北京: 冶金工业出版社, 1999: 124)
