Electrochemical investigation of chloride-induced depassivation of black steel rebar under simulated service conditions

Ghods, Pouria; Isgor, O. Burkan; McRae, Glenn; Gu, Gordon Ping

doi:10.1016/j.corsci.2010.02.016

Cited by 163 publications

(72 citation statements)

References 42 publications

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“…The steel surface was machined [30], ground [31], sandblasted [26,32] or in most cases mechanically polished [33][34][35][36][37]. Upon exposure to alkaline solutions, literature work agrees on an asymptotical increase of the open circuit potential (OCP) [26,[30][31][32][33][34][36][37][38][39][40] and of the polarization resistance [32,37,38,40] with time of exposure, indicating the formation of a protective iron oxide film. Although a protective passive film starts to form soon after exposure of steel to passivating solutions, the quality and stability of the film depends on the exposure duration and the chemical composition of the passivating solution.…”

Section: Passive Filmmentioning

confidence: 69%

“…Although a protective passive film starts to form soon after exposure of steel to passivating solutions, the quality and stability of the film depends on the exposure duration and the chemical composition of the passivating solution. Longer immersion times lead to higher polarization resistance [30,37,40]. While at pH [ 13, protective properties of the passive film are clearly observed after about 1d of immersion, at least 3-5 days are required for steel in saturated Ca(OH) 2 (pH * 12.5) [26,38,[40][41][42].…”

Section: Passive Filmmentioning

confidence: 99%

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The steel–concrete interface

et al. 2017

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Although the steel-concrete interface (SCI) is widely recognized to influence the durability of reinforced concrete, a systematic overview and detailed documentation of the various aspects of the SCI are lacking. In this paper, we compiled a comprehensive list of possible local characteristics at the SCI and reviewed available information regarding their properties as well as their occurrence in engineering structures and in the laboratory. Given the complexity of the SCI, we suggested a systematic approach to describe it in terms of local characteristics and their physical and chemical properties. It was found that the SCI exhibits significant spatial inhomogeneity along and around as well as perpendicular to the reinforcing steel. The SCI can differ strongly between different engineering structures and also between different members within a structure; particular differences are expected between structures built before and after the 1970/1980s. A single SCI representing all on-site conditions does not exist. Additionally, SCIs in common laboratory-made specimens exhibit significant differences compared to engineering structures. Thus, results from laboratory studies and from practical experience should be applied to engineering structures with caution. Finally, recommendations for further research are made. This report was prepared by the working group within RILEM TC 262-SCI, and further reviewed and approved by all members of the RILEM TC 262-SCI.

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Section: Passive Filmmentioning

confidence: 69%

Section: Passive Filmmentioning

confidence: 99%

The steel–concrete interface

et al. 2017

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“…Several research papers have investigated the corrosion behaviour of metals in presence of simulated concrete pore (SCP) solutions [14][15][16][17][18][19][20][21][22][23][24][25] . Usually steel rebars have been used in such studies.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of Mild Steel in Simulated Concrete Pore Solution

Pandiarajan¹,

Prabhakar²,

Rajendran³

2013

Chem Sci Trans

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Concrete admixtures can be prepared in various water samples such as rainwater, well water, and seawater. These waters contain various types of ions. So corrosion behavior of mild steel immersed in simulated concrete pore solution prepared with the above water samples will vary. Corrosion resistance of mild steel in simulated concrete pore solution prepared with above water samples has been evaluated by AC impedance spectra. The corrosion resistance of mild steel in various samples of water is as follows: Rainwater>Well water>Seawater. The corrosion resistance of mild steel in simulated concrete pore solution prepared in various water samples are in the decreasing order: Rainwater > Well water > Seawater. This is revealed by charge transfer resistance values and double layer capacitance values.

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“…15,16) The polished carbon steel stabilizes at about − 220 mV (SCE) in pore solution. 17,18) We measured the potential of samples in pore solution without chloride addition up to 624 h is shown in Fig. 2.…”

Section: Corrosion Potentialmentioning

confidence: 99%

Optimized Cr Concentration in Reinforcement Steel for High Corrosion Resistance in Simulated Pore Solution by Electrochemical and Cyclic Corrosion Tests

2016

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Nine samples of low-carbon steel were prepared by varying composition of Cr and Mn. The weight% of Cr and Mn in samples are 0.2Cr, 0.5Cr and 5Cr, and 0.5Mn, 1.0Mn and 1.5Mn respectively.The electrochemical tests such as corrosion potential, EIS, Linear polarization and Cyclic polarization were conducted on samples in simulated pore solution with and without the presence of 3.5% NaCl. Separately, samples were exposed to wet-dry corrosion test and their corrosion products were examined by XRD and FTIR. Further, oxidised surface was studied by SEM/EDS.The samples show passive behaviour in chloride free pore solution but passivity breaks after chloride addition. Even, 5Cr containing steels could not hold passive characteristic in chloride medium. In wet-dry corrosion test, 5Cr containing steels develop loose and voluminous corrosion products which is highly detrimental for rebar application.On the contrary, the lower Cr containing steels, 0.2Cr and 0.5Cr, produce thin and adherent rust in wetdry corrosion test. In electrochemical test, these steel samples too transfer from passive to active state after chloride ion addition in pore solution but their behaviour is superior. More particularly, two steel chemistry 0.2Cr, 0.5Mn and 0.5Cr, 1.5Mn show a sign of repassivation and pitting resistance respectively.

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Electrochemical investigation of chloride-induced depassivation of black steel rebar under simulated service conditions

Cited by 163 publications

References 42 publications

The steel–concrete interface

The steel–concrete interface

Corrosion Resistance of Mild Steel in Simulated Concrete Pore Solution

Optimized Cr Concentration in Reinforcement Steel for High Corrosion Resistance in Simulated Pore Solution by Electrochemical and Cyclic Corrosion Tests

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