Influence of Carbonization and Chloride Salt on Passivation of Steel Bars in Concrete Pore Solution

被引：0
|
作者：
Li X. [1 ]
Liu J. [1 ]
Yan J. [1 ]
Wang J. [1 ]
机构：
[1] Faculty of Civil Engineering and Environment, Ningbo University, Ningbo
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2020年 / 23卷 / 01期
关键词：
Carbonation; Chloride ion; Concrete pore solution; Corrosion product; Microstructure;
D O I：
10.3969/j.issn.1007-9629.2020.01.033
中图分类号：
学科分类号：
摘要：
The microstructures and composition of steel corrosion products in concrete pore solution under carbonation and chloride salt were studied by X-ray photoelectron spectroscopy(XPS). The corrosion mechanism of steel bars under the corrosion factors was elucidated. The results show that the passivation film and corrosion coexist in chloride-salt pore solution. The surface of corrosion is relatively dense and mainly consists of FeOOH and FeO. Yellow and black corrosions are on the surface of the steel immersed in the carbonized solution. The main components of corrosion products are FeOOH, Fe3O4 and Fe2O3. The surface of the steel bar has a large amount of tawny corrosion products in the mixed pore solution of carbonization and chloride. The surface of the corrosion products are stripped and the main components are FeOOH, Fe3O4 and FeCl3, where the content of FeOOH is as high as 60% or even higher. The XPS scanning peak value of iron is gradually increased from the chloride salt pore solution, carbonized solution to the mixed pore solution of carbonation and chloride. The iron oxide content is increased and corrosion of steel is obviously serious. © 2020, Editorial Department of Journal of Building Materials. All right reserved.
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页码：224 / 229
页数：5
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共 20 条
  • [11] Ai Z., Sun W., Jiang J., Et al., Passive behavior of new alloy corrosion resistant steel Cr10Mo1 in chloride-containing environment, Materials Review, 30, 8, pp. 92-101, (2016)
  • [12] Tang Y., Wang S., Xu Y., Influence of calcium nitrite on the passive films of rebar in simulated concrete pore solution, Anti-Corrosuin Methods and Mateials, 64, 3, pp. 265-272, (2017)
  • [13] Alhozaimy A., Hussain R.R., Al-Negheimish A., Et al., Effect of simulated concrete pore solution chemistry, chloride ions, and temperature on passive layer formed on steel reinforcement, ACI Materials Journal, 111, 4, pp. 411-421, (2014)
  • [14] Zhou Y., Zuo Y., Surface films on plasma nitrided stainless steel subjected to passivation treatments, Applied Surface Science, 353, pp. 924-932, (2015)
  • [15] Liu J., Sun W., Chen J., Et al., Carbonation rate and microstructural characteristics of hardened cement paste with high alkali content, Journal of the Chinese Ceramic Society, 42, 7, pp. 1005-1010, (2014)
  • [16] Ghods P., Lsgor O.B., Brwon J.R., XPS depth profiling study on the passive oxide film of carbon steel in saturated calcium hydroxide solution and the effect of chloride on the film properties, Applied Surface Science, 259, pp. 4669-4677, (2011)
  • [17] Robert B., Batric P., Jacob K., Threshold chloride concentrations and passivity breakdown of rebar steel in real concrete solution at different pH conditions with the addition of glycerol, Acta Metallurgica Sinica-English Letters, 30, 4, pp. 376-389, (2017)
  • [18] Ye H., Tian Y., Jin N., Et al., Influence of cracking on chloride diffusivity and moisture influential depth in concrete subjected to simulated environmental conditions, Construction and Building Materials, 47, pp. 66-79, (2013)
  • [19] Rosas O., Maya-Visuet E., Castaneda H., Effect of chloride ions on the electrochemical performance of LDX 2003 alloy in concrete and simulated concrete-pore solutions, Journal of Applied Electrochemistry, 44, 5, pp. 631-646, (2014)
  • [20] Liu J., Ba M., Du Y., Et al., Effects of chloride ions on carbonation rate of hardened cement paste by X-ray CT technics, Construction and Building Materials, 122, pp. 619-627, (2016)
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