The breakdown of passive films on iron

Bird, H.E.H.; Pearson, B.R.; Brook, P.A.

doi:10.1016/0010-938x(88)90009-1

Cited by 40 publications

(14 citation statements)

References 4 publications

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“…Many studies show that pH has an important role in pitting resistance [22,23]. If we admit that the pitting process is carried out in four phases: passive film formation, passive film breakdown, metastable pits apparition, irreversible evolution of pits [24], it becomes clear that increasing the pH will supply hydroxides that promotes the formation of iron hydroxides which precipitate and reinforce the passive film.…”

Section: 2effect Of Ph On the Pitting Penitentialmentioning

confidence: 99%

Artificial intelligence to predict inhibition performance of pitting corrosion

Boukhari¹,

Boucherit²,

Zaabat³

et al. 2017

J. Fundam and Appl Sci.

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Section: 2effect Of Ph On the Pitting Penitentialmentioning

confidence: 99%

Artificial intelligence to predict inhibition performance of pitting corrosion

Boukhari¹,

Boucherit²,

Zaabat³

et al. 2017

J. Fundam and Appl Sci.

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“…The basic arrangement refers to (Hsu et al 2000). The model is faithfully fitted to actual behaviour using coefficient values based on past experimental data (Bird et al 1988;Funahashi et al 1991;Kranc et al 1997). The micro-cell corrosion current density is at the intersection between the internal cathodal polarization curve and the internal anodal polarization curve.…”

Section: Micro-cell Corrosion Modelmentioning

confidence: 99%

“…(13) and the pitting potential, which constitutes an internal anodal polarization curve, is shown in Eq. (14) (Bird et al 1988). The half-cell potential is assumed to be the electric potential for a saturated copper sulphate electrode (V vs. CSE).…”

Section: Micro-cell Corrosion Modelmentioning

confidence: 99%

Establishment of Coupled Analysis of Interaction between Structural Deterioration and Reinforcement Corrosion by Salt Damage

Suzuki

Fukuura²,

Takeda

et al. 2016

ACT

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This study develops an analysis method for estimating the process of corrosion in concrete, including initial corrosion and the onset of corrosion-induced cracking. The method is suitable for application in rationalizing the verification of the durability of salt-damaged RC structures. Corrosion deterioration is computed by coupling the analysis of structure with the analysis of reinforcement corrosion. A method of calculating macro-cell corrosion in consideration of macro-cell corrosion current density is also proposed, focusing on cathodic elements of a reinforcing bar. The proposed analytical method is validated against dry-wet cyclic tests with salt solution to simulate macro-cell corrosion. We verify the accuracy of the method by confirming the non-uniformity of the concrete before cracking and, by coupling the analysis with structural analysis, investigating how the expansion ratio of corrosion products and diffusion coefficient of chloride ions affect the onset of corrosion, the time of initial corrosion cracking, the chloride ion density and the corrosion amount. This paper is based on an original paper (Suzuki et al. 2014) written in Japanese.

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“…The threshold concentration of chloride ions in concrete, sufficient for initiating corrosion, has been studied by several researchers [Hansson, 1984;Page and Treadaway, 1982;Bird et al, 1988;and Wheat and Eliezer, 1987]. The threshold concentration of Chloride ions act as a catalyst in the corrosion reaction since the corrosion reaction does not consume any chloride ions.…”

Section: Initiation Of Corrosion On Reinforcing Steelmentioning

confidence: 99%

“…Chloride ions in reinforced concrete can originate from several sources. For example, calcium chloride is often added to 56 concrete as an accelerating agent, de-icing salt is used in winter on highways for traffic safety purposes, coastal structures are exposed to salt spray, and sea sand and other natural aggregates may bring chloride into concrete.The threshold concentration of chloride ions in concrete, sufficient for initiating corrosion, has been studied by several researchers [Hansson, 1984;Page and Treadaway, 1982;Bird et al, 1988;and Wheat and Eliezer, 1987]. The threshold concentration of Chloride ions act as a catalyst in the corrosion reaction since the corrosion reaction does not consume any chloride ions.…”

mentioning

confidence: 99%

Development and Evaluation of Cement-Based Materials for Repair of Corrosion-Damaged Reinforced Concrete Slabs

Liu¹,

Olek²

2001

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Prepared in cooperation with the Indiana Department of Transportation and Federal Highway Administration. AbstractIn this study, the results of an extensive laboratory investigation conducted to evaluate the properties of concrete mixes used as patching materials to repair reinforced concrete slabs damaged by corrosion are reported.Seven special concrete mixes containing various combinations of chemical or mineral admixtures were developed and used as a patching material to improve the durability of the repaired slabs. Physical and mechanical properties of these mixes, such as compressive strength, static modulus of elasticity, dynamic modulus of elasticity, and shrinkage were evaluated. Durability-related parameters investigated included resistance of concrete to penetration of chloride ions and freeze-thaw resistance. The results generated during this research indicated that chemical and mineral admixtures improved physical, mechanical, and durability properties of repair concrete.In addition, the ability of various repair mixes to reduce the progress of corrosion was monitored using half-cell potential, polarization resistance, and electrochemical impedance spectroscopy techniques. Half-cell potential measurements provided information about the possibility of corrosion taking place on the steel surface. Polarization resistance measurements were used to determine the corrosion current density, and provided a quantitative estimation of the corrosion rate. Electrochemical impedance spectroscopy technique was used to monitor the corrosion rate, the change in resistivity of concrete, and change in polarization resistance.The results obtained from 21 reinforced concrete slabs exposed to cycles of wetting and drying indicated that both organic corrosion inhibitor and calcium nitrite (anodic corrosion inhibitor) delayed the initiation of active corrosion on the steel surface. Silica fume concrete, fly ash concrete, latex modified concrete, and concrete with shrinkage reducing admixture had low permeability and high resistivity. These properties improved the durability of repaired slabs either by delaying the initiation of active corrosion or by reducing the corrosion rate. Key WordsCorrosion, rehabilitation, concrete, durability, reinforcing steel, bridge deck, chloride ion, corrosion rate, polarization resistance, electrochemical impedance spectroscopy. Distribution StatementNo restrictions. This document is available to the public through the National Technical Information Service, Springfield, VA 22161 SPR-2141 Final Report Development and Evaluation of Cement-Based Patching Materials for Repair of Corrosion-DamagedReinforced Concrete Slabs IntroductionDamage of bridge decks due to corrosion of reinforcing steel resulting from the application of deicing salts is often extensive and typically requires expensive repairs.A common method of bridge decks repair involves removal of the contaminated and delaminated concrete, sandblasting of the steel surface and, in most extreme cases, replacement of damaged steel bar...

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The breakdown of passive films on iron

Cited by 40 publications

References 4 publications

Artificial intelligence to predict inhibition performance of pitting corrosion

Artificial intelligence to predict inhibition performance of pitting corrosion

Establishment of Coupled Analysis of Interaction between Structural Deterioration and Reinforcement Corrosion by Salt Damage

Development and Evaluation of Cement-Based Materials for Repair of Corrosion-Damaged Reinforced Concrete Slabs

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