Electrochemical behaviour of steel in plain and blended cement concretes in sulphate and/or chloride environments

Jarrah, N.R.; Al‐Amoudi, Omar S. Baghabra; Maslehuddin, Mohammed; Ashiru, O. A.; Al-Mana, A.I.

doi:10.1016/0950-0618(95)00002-w

Cited by 55 publications

(13 citation statements)

References 6 publications

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“…There is also a significant decrease in the redox potentials of steel reinforcement in PC-slag blends with [ 75% replacement of PC with slag [4,18], primarily due to the release of reduced sulfur species. A recent study [14] (also highlighted in [4,18,19]) showed that the highly reducing nature of the slag limits the concentration of dissolved oxygen, yielding significantly lower electrochemical potentials of the steel reinforcement embedded in PC-slag blends compared to plain PC.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of passivation and chloride-induced corrosion of mild steel in sulfide-containing alkaline solutions

Mundra

Provis

2021

J Mater Sci

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The pore fluid within many concretes is highly alkaline and rich in reduced sulfur species, but the influence of such alkaline-sulfide solutions on the surface film formed on steel reinforcement is poorly understood. This study investigates the critical role of HS− in defining mild steel passivation chemistry. The surface film formed on the steel in alkaline-sulfide solutions contains Fe(OH)2 and Fe–S complexes, and the critical chloride concentration to induce corrosion increases at high sulfide concentration. However, this behavior is dependent on the duration of exposure of the steel to the electrolyte, and the nature of the sulfidic surface layer.

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Section: Introductionmentioning

confidence: 99%

Mechanisms of passivation and chloride-induced corrosion of mild steel in sulfide-containing alkaline solutions

Mundra

Provis

2021

J Mater Sci

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“…Given the dependence of the potential value on the properties of the embedding concrete, it may be envisaged that a potential monitoring over time is a better indicator of corrosion initiation than a potential value [2,3]. This method has been adopted in several studies to detect the initiation of corrosion in the case of reinforcement embedded in concrete [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A new approach to determine the chloride threshold initiating corrosion: Preliminary results

2018

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The initiation of corrosion by chlorides is traditionally based on the existence of a threshold that would lead to corrosion. Almost all existing approaches considered implicitly that corrosion induced by chlorides is uniform and take not into account the intrinsic localized character of corrosion in reinforced concrete structures. This work aims to implement a new test protocol that takes explicitly into account the localized nature of chlorides-induced corrosion by inducing physical separation between anode and cathode thus permitting to measure the corrosion current. The anodic part allows to test different levels of chlorides and the cathodic part to highlight the ohmic (limiting ionic current by low porosity) and cathodic (restricting access to oxygen due to saturation of porosity, low porosity, dioxygen consumption by additions) control of corrosion. The chloride threshold is set on the basis of a threshold corrosion current that is considered acceptable with respect to the structure’s life. The first results provide a preliminary idea of the variation of corrosion rate in function of chlorides content. This method also highlights the influence of surface condition of the steel-concrete interface on the corrosion current.

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“…As described above, many researches have been done for chloride-induced steel corrosion. However, fewer works are focused on sulfate-induced steel corrosion, even the corrosion mechanism of sulfate ions is still not clear, and there are also some controversies on the corrosivity of sulfate against chloride ions in alkaline and neutral environments [16][17][18][19][20][21][22][23]. Additionally, all of these works for sulfate-induced 2 International Journal of Corrosion corrosion are just performed in concrete or solution without the addition of any corrosion inhibitor.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitrite Ions on Steel Corrosion Induced by Chloride or Sulfate Ions

Cao

Hibino

Goda

2013

International Journal of Corrosion

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The influence of nitrite concentration on the corrosion of steel immersed in three simulated pH environments containing chloride ions or sulfate ions has been investigated by comparing and analyzing the change of half-cell potential, the change of threshold level of Cl − or SO 4 2− , the change of threshold level of NO 2 − /Cl − or NO 2 − /SO 4 2− mole ratio, and the changes of anodic/cathodic polarization curves and Stern-Geary constant. The corrosivity of chloride ions against sulfate ions also has been discussed in pH 12.6, pH 10.3, and pH 8.1 environments containing 0, 0.053, and 0.2 mol/L NO 2 , respectively.

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Electrochemical behaviour of steel in plain and blended cement concretes in sulphate and/or chloride environments

Cited by 55 publications

References 6 publications

Mechanisms of passivation and chloride-induced corrosion of mild steel in sulfide-containing alkaline solutions

Mechanisms of passivation and chloride-induced corrosion of mild steel in sulfide-containing alkaline solutions

A new approach to determine the chloride threshold initiating corrosion: Preliminary results

Effect of Nitrite Ions on Steel Corrosion Induced by Chloride or Sulfate Ions

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