Pore Solution Composition and Electrochemical Behavior of Steel Bars in Mortars with Ca (NO2) 2 and NaNO2

Kawamura, Mitsunori; Tanikawa, Shin; Koto, Hidefumi

doi:10.3151/crt1990.8.1_75

Cited by 4 publications

(2 citation statements)

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“…The presence of CNI in the pore solution leads to precipitate calcium hydroxide (and consequent reduction in pH) [Li et al, 2000] [5]. Kawamura et al (1997) [6] [7]. In salt solution the AMAbased inhibitor delayed the initiation of corrosion and reduced the Icorr (when the NaCl concentration is 0.3%, Icorr was 0.45 and 0.1µA/cm 2 for the control and the inhibitor samples, respectively) [Heiyantuduwa et al,2003] [8].…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of corrosion inhibitors in simulated concrete pore solution

Elshami

Bonnet

Khelidj

et al. 2018

European Journal of Environmental and Civil Engineering

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Steel embedded in concrete is normally in a passive state against corrosion due to a thin iron oxide layer that forms on the steel surface and remains stable in the high alkaline environment of the concrete. This protective film must be destroyed (depassivation) and this can be mainly done in two ways: by the attack of chlorides on the steel (seawater, de-icing salt, unwashed sea sand, admixtures etc.) or by carbonation. Corrosion inhibitors may be a good alternative to protection steel against corrosion due to its lower cost and easy application. Many researchers are inclined to use surface applied corrosion inhibitors and prefer to use the Cl-/inhibitor parameter as an indication of chloride inhibitor threshold level. The objective of this study was to fill the gap left by public research in developing methods of corrosion control of reinforcement in concrete by synthetic solutions to emulate concrete environment. Three inhibitors were distinguished as passivation inhibitors in real solution extract and synthetic. In this study the tests with calcium nitrite (CNI), sodium monoflurophosphate (MFP) and ethanolamine based inhibitors showed reductions in the overall rates of corrosion after the inhibitive treatments.

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Section: Introductionmentioning

confidence: 99%

Effectiveness of corrosion inhibitors in simulated concrete pore solution

Elshami

Bonnet

Khelidj

et al. 2018

European Journal of Environmental and Civil Engineering

View full text Add to dashboard Cite

show abstract

“…The effectiveness of nitrite compounds as an admixture to prevent steel bars from corroding in concrete containing chloride ions is generally well documented [1][2][3][4][5]. However, there is still little attempt to prevent the corrosion of steel bars by the penetration of nitrite ions from the outside to hardened concrete with relatively large amounts of chloride ions except that Ngala et al [3] assessed the efficiency of calcium nitrite as an inhibitor when used in surface treatment.…”

Section: Introductionmentioning

confidence: 99%