Electrochemical Behavior of Steel in Saturated Calcium Hydroxide Solution Containing Cl−, SO42−, and CO32−Ions

Boah, J.K.; Somuah, S. K.; Leblanc, P.

doi:10.5006/1.3585081

Cited by 23 publications

(14 citation statements)

References 4 publications

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“…Sulfate ions is the most common ionic forms in desulfurization solution. Liu et al [ 9 ] and Boah et al [ 10 ] obtained the consistent conclusion that sulfate ion was even more corrosive than chloride ion. Xu et al [ 11 ] demonstrated that sodium sulfate was harmful to the stability of the passive film.…”

Section: Introductionmentioning

confidence: 77%

The Corrosion Features of Q235B Steel under Immersion Test and Electrochemical Measurements in Desulfurization Solution

2020

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With the continuous tightening marine diesel engines emission standards, removing sulfur oxides (SOX) by sodium hydroxide solution absorption is a highly efficiency and economic method, which has been a hot area of research. The ensuing desulfurization solution is a new corrosive system, the aim of this paper is to ascertain the corrosion feature of Q235B steel in desulfurization solution, which lays a theoretical foundation for industrialization. For this purpose, mass loss, electrochemical techniques and surface analyses were applied. The results of mass loss highlight a reduction in the corrosion rate with 35 days of immersion. Higher exposure time increased the compactness of the corrosion product layer and changed phase composition. These conclusions are supported by surface analyses, such as X-ray diffraction and scanning electron microscope. However, electrochemical results showed that the polarization resistance Rp was fluctuant. Both of Rp and charge transfer resistance Rt reach a maximum after immersing 21 days. In addition, although the sediments attached to the steel surface could inhibit corrosion, pitting corrosion aggravated by hydrolyzation of FeSO4 should be given more attention.

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Section: Introductionmentioning

confidence: 77%

The Corrosion Features of Q235B Steel under Immersion Test and Electrochemical Measurements in Desulfurization Solution

2020

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“…Figures (1) to (3) represent the relation between the loads and buckling for the unenhanced specimens and enhanced specimens with 40 mm cover or with CFRP sheets, respectively. Figures (4) to (6) represent the relation between the loads and strain of steel for the unenhanced and enhanced specimens with 40 mm cover or with CFRP sheets, respectively. Figures (7) to (9) represent the relation between the loads and strain of concrete for the unenhanced and enhanced specimens with 40 mm cover or with CFRP sheets, respectively.…”

Section: Analyzing the Results And Presenting Themmentioning

confidence: 99%

Investigating Measures to Increase the Lifespan of Concrete Coastal Structures in the Nile Delta

Elnawawy

Atia

Elserafy

et al. 2014

The International Conference on Civil and Architecture Engineer

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In terms of the importance of enhancing concrete coastal structures exposed to chlorides, this study was initiated with the objective of increasing their lifespan. Two measures were proposed (i.e. to increase the thickness of the concrete cover oradd Carbon Fiber Reinforced Polymer (CFRB) sheets).27 R.C. specimens were investigated experimentally. The specimens were exposed to variable sodium chlorideratios by weight "salt cement ratio"(s/c) (i.e. 3:100 "3%", 3:50 "6%" and 1:10 "10%"). The specimens were prepared, cured, dried and tested. The Zagazig Structural Laboratory was set. Measuring devices were fixed and measurements were undertaken. Also, photos were captured and observations were documented. The strains, cracking load and cracking pattern were determined.The undertaken measurements, the shot photos and documented observations were analyzed; graphs relating the different parameters were plotted and were presented. It was found that these enhancement measures improved the behavior of the concrete specimens subjected to Chlorides which would most probably extend the lifespan of concrete coastal structures. U ‫ﺍﻟﻌﺮﺑﻰ:‬ ‫ﺍﻟﻤﻠﺨﺺ‬ ‫ﻳﺘﻌﻠﻖ‬ ‫ﻓﻴﻤﺎ‬ ‫ﺑﺄﻫﻤﻴﺔ‬ ‫ﺍﻟﺘﻰ‬ ‫ﺍﻟﺨﺮﺳﺎﻧﻴﺔ‬ ‫ﺍﻟﺴﺎﺣﻠﻴﺔ‬ ‫ﺍﻟﻤﻨﺸﺄﺕ‬ ‫ﻣﺸﺎﻛﻞ‬ ‫ﺍﻏﻠﺐ‬ ‫ﻋﻦ‬ ‫ﺗﺪﻫﻮﺭﻫﺎﻳﻨﺘﺞ‬ ‫ﺻﺪﺃ‬ ‫ﺻﻠﺐ‬ ‫ﺍﻟﺘﺴﻠﻴﺢ‬ ‫ﻫﺬﺍ‬ ‫ﻓﻰ‬ ‫ﺍﻟﺒﺪء‬ ‫ﺗﻢ‬ ‫ﺍﺟﺮﺍء‬ ‫ﺍﻟﻰ‬ ‫ﻳﻬﺪﻑ‬ ‫ﺍﻟﺬﻯ‬ ‫ﺍﻟﺒﺤﺚ‬ ‫ﺩﺭﺍﺳﺔ‬ ‫ﻋﻦ‬ ‫ﻣﻌﻤﻠﻴﺔ‬ ‫ﺻﺪﺃ‬ ‫ﺻﻠﺐ‬ ‫ﺍﻟﺘﺴﻠﻴﺢ‬ ‫ﺍﻣﻼﺡ‬ ‫ﻣﻦ‬ ‫ﻋﺎﻟﻴﺔ‬ ‫ﻧﺴﺐ‬ ‫ﺗﻮﺍﺟﺪ‬ ‫ﻋﻦ‬ ‫ﺍﻟﻨﺎﺗﺞ‬

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“…Cement paste contains large amount of hydroxyl radicals -OH. The high electronegativity of iron in steel (1.83) and oxygen in the radical -OH (3.44) favors the hydrogen bonding between the iron atom Fe and the radical -OH to form Fe(OH)2 molecules [33] followed by the transformation of the initial impermeable oxyhydroxide film into a porous, non-protective iron carbonate film [89]. The breakdown of this passive layer causes an increase in the substrate reactivity and corrosion rate.…”

Section: Electrochemical Bondingmentioning

confidence: 99%

Designing metallic surfaces in contact with hardening fresh concrete: A review

Coniglio

Spitz

Mansori

2020

Construction and Building Materials

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Concrete, a commonly used material in the construction industry, interacts with metallic surfaces such as formwork during pouring and reinforced bar during lifespan. Formworks are designed to minimize hardened concrete adherence in order to avoid wall defects after formwork removal. In opposite, reinforced bar designs aim at maximizing their adherence to concrete for optimizing the transmission of mechanical solicitations. The present review investigates the surface properties that govern bonding of freshly poured concrete onto metallic surfaces. Identifying the underlying mechanisms of adhesion highlighted the importance of substrate characteristics (roughness, composition), concrete curing and compaction), and interfacial additives (release agents, wetting). This paper addresses the basic requirements in designing a functional surface interacting with concrete and emphasizes today challenges.

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Electrochemical Behavior of Steel in Saturated Calcium Hydroxide Solution Containing Cl⁻, SO₄²⁻, and CO₃²⁻Ions

Cited by 23 publications

References 4 publications

The Corrosion Features of Q235B Steel under Immersion Test and Electrochemical Measurements in Desulfurization Solution

The Corrosion Features of Q235B Steel under Immersion Test and Electrochemical Measurements in Desulfurization Solution

Investigating Measures to Increase the Lifespan of Concrete Coastal Structures in the Nile Delta

Designing metallic surfaces in contact with hardening fresh concrete: A review

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