简述了混凝土中钢筋锈蚀的电化学阻抗谱测试常用的等效电路, 对比分析了不同等效电路的优劣性. 根据混凝土中钢筋的钝化、初锈与锈蚀发展期三个阶段选取相应的等效电路进行拟合分析. 结果表明, 随着钢筋锈蚀的发展, 等效电路拟合时需要增加时间常数; 应用常相角元件CPE和Warburg扩散元件能更好地进行阻抗谱拟合.
The commonly used equivalent circuits for electrochemical impedance spectroscopy (EIS) testing in reinforcing steel corrosion in concrete have been reviewed, and the advantages and disadvantages of different equivalent circuits were discussed. Appropriate equivalent circuits were selected and analysed for EIS fitting according to the three stages of reinforcing steel corrosion proces, i.e. passivation, corrosion initiation and corrosion propagation. The results indicated that additional time constants may be required with the evolution of reinforcing steel corrosion; moreover, constant phase element (CPE) and Warburg diffusion element were also demanded for best EIS fittings.
参考文献
| [1] | John D G, Searson P C, Dawson J L. Use of impedance technique in studies on steel in concrete in immersed conditions[J].Bri. Corros. J., 1981, 16(2): 102.[2] Montemor M F, Simoes A M P, Ferreira M G S. Chloride-induced corrosion on reinforcing steel from the fundamentals to the monitoring techniques[J]. Cem. Concr. Compos.,2003, 25(4-5): 491.[3] Andrade C, Soler L, Novoa X R. Advances in electrochemical impedance measurements in reinforced concrete[J]. Mater. Sci. Forum,1995, 192-194: 843.[4] MacDonald D D. Reflections on the history of electrochemical impedance spectroscopy[J]. Electrochim. Acta, 2006,51(8-9): 1376.[5] Metha P K, Monteiro P J M. Concrete-Microstructure, properties, and materials (Third edition)[M]. McGraw Hill, 2006.[6] Feliu V, Gonzalez J A, Feliu S. Algorithm for extracting corrosion parameters from the response of the steel-concrete system to a current pulse[J]. J. Electrochem. Soc., 2004, 151(3): B134.[7] Feliu V, Gonzalez J A, Andrade C. Equivalent circuit for modelling the steel-concrete interface. I. experimental evidence and theoretical predictions[J]. Corros. Sci., 1998, 39(5): 864.[8] Andrade C, Keddam M, Novoa X R, et al. Electrochemical behaviour of steel rebars in concrete: influence of environmental factors and cement chemistry [J]. Electrochim. Acta, 2001, 46 (24-25): 3905.[9] Jamil H E, Shriri A, Boulif R, et al. Corrosion behaviour of reinforcing steel exposed to an amino alcohol based corrosion inhibitor[J]. Cem. Concr. Compos., 2005, 27 (6): 671.[10] Hachani L, Fiaud C, Triki E, et al. Characterisation of steel/concrete interface by electrochemical impedance spectroscopy[J]. Bri. Corros. J., 1994, 29(2): 122.[11] Feliu S, Gonzalez J A, Andrade C, et al. The determination of the corrosion rate of steel in concrete by a non-stationary method[J]. Corros. Sci., 1986, 26(11): 961.[12] Keddam M, Novoa X R, Soler L. An equivalent electrical circuit of macrocell activity in facing electrodes embedded in cement mortar[J]. Corros. Sci., 1994, 36(7): 1155.[13] Sagoe-Crentsil K K, Glasser F P, Irvine J T S.Electrochemical characteristics of reinforced concrete corrosion as determined by impedance spectroscopy[J]. Bri. Corros. J., 1992,27(2): 113.[14] Newton C J, Sykes J M. A galvanostatic pulse technique for investigation of steel corrosion in concrete[J]. Corros. Sci., 1988,28(11): 1051.[15] Wenger F, Galland J. Study of corrosion of steel in concrete by electrochemical impedance measurements[J]. Mater. Sci.Forum, 1989, 44-45: 375.[16] Koleva D A, Wit J H W de, Breugel K van, Investigation of corrosion and cathodic protection in reinforced concrete. I.application of electrochemical techniques[J]. J. Electrochem. Soc.,2007, 154(4): 52.[17] Gu P, Beaudoin J J. Estimation of steel corrosion rate in reinforced concrete by means of equivalent circuit fittings of impedance spectra[J]. Adv. Cem. Res., 1998, 10(2): 43.[18] Vedalakshmi R, Palaniswamy N. Analysis of the electrochemical phenomenon at the rebar-concrete interface using the electrochemical impedance spectroscopic technique[J]. Mag. Concr.Res., 2010, 62(3): 177.[19] Ford S J, Shane J D, Mason T O. Assignment of features in impedance spectra of the cement-paste steel system[J]. Cem. Concr.Res., 1998, 28(12): 1737. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%