|
|
|
| ENVIRONMENTAL FACTORS CONTROLLING EARLY CORROSION PERFORMANCE OF CARBON STEEL UNDER LIQUID LAYER CONTAINING SO42- |
| TANG Zilong1,2, LI Hui1, LI Chao1 |
1．School of Materials Science and Engineering, Tianjin University, Tianjin 300072
2．Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072 |
|
|
|
|
Abstract Corrosion performance of carbon steel under 10 mmol/L Na2SO4 liquid layer is investigated by inductive resistance probe(IRP) and electrochemistry techniques. Average corrosion rate in wet period, named by IFACR, is calculated based on integration filter algorithm (IFA) with controlled environment factors including time of immersion (TOI), temperature and relative humidity (RH). A data-standardization approach is proposed in order to improve the accuracy of IFACR correlation with the control factors modeled by a linear equation. Two sets of corrosion kinetics parameters, corrosion current density Icorr, polarization resistance Rp and corrosion rate, of Q235 steel in 10 mmol/L Na2SO4 is measured by dynamic potential scan and potential step with an intension to benefit the understanding of corrosion under thin liquid layer. The results indicate that temperature has positive influence on IFACR, while TOI and RH show negative correlation with IFACR. A changed contribution of the factors to IFACR is specified around 24℃ and RH=70% called threshold. This threshold is consistent with that from previous TOW (Time of wetness) measurements. The contribution of TOI to IFACR is minor. However, the domination of temperature and RH on IFACR is strongly dependent on TOI. A detailed discussion on the dependence of IFACR and total corrosion loss on TOI, temperatures and RH is presented with the help of electrochemical measurements.
|
|
Received: 12 November 2008
|
|
|
|
Corresponding Authors:
TANG Zilong
E-mail: zlt633@gmail.com
|
| [1] |
Nishimura T. Rust formation and corrosion performance of Si- and Al-bearing ultrafine grained weathering steel [J]. Corros.Sci, 2008, 50(4):1306-1312 |
| [2] |
Frankel G S, Stratmann M, Rohwerder M. Potential control under thin aqueous layers using a kelvin probe [J]. Corros. Sci, 2007, 49(4):2021-2036 |
| [3] |
Cole I S, Ganther W D,Sinclair J D. A study of the wetting of metal surfaces in order to understand the processes controlling atmospheric corrosion [J]. J.Electrochem. Soc., 2004, 151(12): B627-B635 |
| [4] |
Monnier J, Legrand L, Bellot-Gurlet L. Study of archaeological artefacts to refine the model of iron long-term indoor atmospheric corrosion [J]. J. Nucl.Mater, 2008, 379:105-111 |
| [5] |
Tang Z L, Song X, Zhang Y P. Control factors of time of wetness and IRP corrosion rate of Q235 steel under pure water thin liquid film [J]. J. Chin. Soc. Corros.Prot.，2009，29(3): 161-166 |
| |
唐子龙, 宋鑫, 张义萍. 纯水薄液膜下Q235钢潮湿时间的影响 因素和腐蚀速度的磁阻研究 [J]. 中国腐蚀与防护学报, 2009, 29 (3):161-166 浏览 |
| [6] |
Refait P, Abdelmoula M, Genin J M R. Mechanisms of formation and structure of green rust one in aqueous corrosion of iron in the presence of chloride ions [J]. Corros. Sci, 1998, 40(9):1547-1560 |
| [7] |
Costa J M, Llorente J, Vilarrasa M. Atmospheric Corrosion: Field Study of Metals Runoff [A].Proceedings of the 14th International Corrosion Congress [C]. Cape Town, 1999 |
| [8] |
Corvo F, Minotas J, Delgado J, et al. Changes in atmospheric corrosion rate caused by chloride ions depending on rain regime [J]. Corros. Sci, 2005, 47(4):883-892 |
| [9] |
Kima S T, Maedab Y, Tsujino Y. Assessment of the effect of air pollution on material damages in northeast asia [J]. Atmos. Environ. 2004, 38(1): 37-48 |
| [10] |
Qu Q, Yan C W, Zhang L，et al. Synergism of NaCl and SO2 in the initial atmospheric corrosion of A3 Steel [J]. Acta Metall. Sin., 2002, 38(10): 1062-1066 |
| |
(屈庆, 严川伟, 张蕾等. NaC1和SO2在A3钢初期大气腐蚀中的协同效应 [J]. 金属学报, 2002,38(10): 1062-1066) |
| [11] |
Rodriguez J J S, Hernandez F J S, Gonzalez J E G. The effect of environmental and meteorological variables on atmospheric corrosion of carbon steel, copper, zinc and aluminium in a limited geographic zone with different types of environment [J]. Corros. Sci, 2003, 45:799-815 |
| [12] |
Yamashita M, Konishi H, Kozakura T, et al. In situ observation of initial rust formation process on carbon steel under Na2SO4 and NaCl solution films with wet/dry cycles using synchrotron radiation X-rays [J]. Corros.Sci, 2005, 47(10):2492-2498 |
| [13] |
Gamal A E. Atmospheric corrosion of copper under wet/dry cyclic conditions [J]. Corros. Sci, 2005, 47(6):1370-1383 |
| [14] |
Katayama H, Noda K, Masuda H.Corrosion simulation of carbon steels in atmospheric environment [J].Corros. Sci. 2005, 47(10): 2599-2606 |
| [15] |
Evgin, Tiefnig [P]. US, 5583426, 1996 |
| [16] |
Tang Z L, Song S Z. Numberic analysis of inductive resistance probe and application in atmospheric corrosion [J].J. Chem. Ind. Eng., 2007，58(3): 698-703 |
| [17] |
(唐子龙, 宋诗哲. 磁阻探头系统腐蚀速率解析及在大气腐蚀中的应用 [J], 化工学报，2007，58(3): 698-703) |
| [18] |
Tang Z L, Li C, Qu W C, et al. Correlation between the controlfactors and time of wetness of Q235 steel under Cl$^-$, SO$_4^{2-}$ and CO$_3^{2-}$ contaminants liquid film [J]. J. Chin. Soc. Corros.Prot., 2009，29（6）：426-430 |
| |
唐子龙, 李超,曲文超等. 污染离子对Q235钢潮湿时间的多因素关联性分析 [J]. 中国腐蚀与防护学报, 2009, 29(6):426-430 浏览 |
| [19] |
Tang Z L, Li C, Li H. Corrosion rate of carbon steel under liquid layer containing Cl- and correlation with environment control factors [J]. J. Chin. Soc. Corros. Prot., 2010，30（1）：67-71 |
| |
唐子龙，李超，李辉. NaCl液膜下碳钢腐蚀速率及其环境因素的关联性 [J]. 中国腐蚀与防护学报, 2010, 30(1):67-71 浏览 |
| [20] |
Stratmann M, Hoffmann K. In situ Moβbauer spectroscopic study of reactions within rust layers [J]. Corros. Sci, 1989, 29(11):1329-1352 |
|
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
