Ricinus communis – A green extract for the improvement of anti-corrosion and mechanical properties of reinforcing steel in concrete in chloride media

Palanisamy, S. P.; Maheswaran, G.; Selvarani, A. Geetha; Kamal, C.; Venkatesh, G.

doi:10.1016/j.jobe.2018.05.020

Cited by 67 publications

(11 citation statements)

References 39 publications

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“…The use of biological inhibitors is based on biomolecules such as those derived from green plants that are used as ACIs and, also, are used by applying the inhibitor to concrete, acting as MCIs [96,97]. Other inhibitors are made up of yeast extracts, bacterial cells or other organic substances [98].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Inhibition Mechanism of Steel Reinforcements in Mortar Using Soluble Phosphates: A Critical Review

et al. 2021

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The corrosion inhibition mechanism of soluble phosphates on steel reinforcement embedded in mortar fabricated with ordinary Portland cement (OPC) are reviewed. This review focuses soluble phosphate compounds, sodium monofluorophosphate (Na2PO3F) (MFP), disodium hydrogen phosphate (Na2HPO4) (DHP) and trisodium phosphate (Na3PO4) (TSP), embedded in mortar. Phosphate corrosion inhibitors have been deployed in two different ways, as migrating corrosion inhibitors (MCI), or as admixed corrosion inhibitors (ACI). The chemical stability of phosphate corrosion inhibitors depends on the pH of the solution, H2PO4− ions being stable in the pH range of 3–6, the HPO42− in the pH range of 8–12, while the PO43− ions are stable above pH 12. The formation of iron phosphate compounds is a thermodynamically favored spontaneous reaction. Phosphate ions promote ferrous phosphate precipitation due to the higher solubility of ferric phosphate, thus producing a protective barrier layer that hinders corrosion. Therefore, the MFP as well as the DHP and TSP compounds are considered anodic corrosion inhibitors. Both types of application (MCI and ACI) of phosphate corrosion inhibitors found MFP to present the higher inhibition efficiency in the following order MFP > DHP > TSP.

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Section: Introductionmentioning

confidence: 99%

Corrosion Inhibition Mechanism of Steel Reinforcements in Mortar Using Soluble Phosphates: A Critical Review

et al. 2021

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“…Back-donation energy (ΔEback-donation) can be considered as a tool to predict the electron donating abilities. The mentioned parameter is widely considered in material efficiency studies and is based on chemical hardness of molecules via the following equation [34].…”

Section: Computational Detailsmentioning

confidence: 99%

Synthesis, photophysical, electrochemical, and DFT examinations of two new organic dye molecules based on phenothiazine and dibenzofuran

Periyasamy¹,

Sakthivel²,

Venkatesh³

et al. 2022

J Mol Model

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New dyes were developed and produced utilizing distinct electron donors (phenothiazine and dibenzofuran), a -spacer, and an electron acceptor of cyanoacetohydrazide, and their structures were studied using FT-IR and NMR spectroscopy. Following the synthesis of dye molecules, the photophysical and photovoltaic characteristics were investigated using experimental and theoretical methods. The photosensitizers have been exposed to electrochemical and optical property experiments in order to study their absorption performance and also molecular orbital energies. The monochromatic optical conversion efficiency of (Z)-N-((5-(10H-phenothiazin-2-yl)furan-2-yl)methylene)-2-cyanoacetohydrazide (PFCH) found higher than that of (Z)-2-cyano-N'- ((5-(dibenzo[b,d]furan-4-yl)furan-2-yl)methylene)acetohydrazide (BFCH), with IPCEs of 58 and 64% for BFCH and PFCH, respectively. According to the photosensitizer molecular energy level diagram, the studied dye molecules have strong thermodynamically advantageous ground and excited state oxidation potentials for electron injection into the conduction band of titanium oxide. It was observed that the ability to attract electrons correlated favorably with molecular orbital energy. While density functional theory calculations were used to examine molecule geometries, vertical electronic excitations, and frontier molecular orbitals, experimental and computed results were consistent. Natural bond orbital and nonlinear optical properties were also calculated and discussed.

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“…These results illustrate that gummy cedar extract has a corrosion inhibiting effect, probably due to the formation of an adsorption film on the original passive layer on the surface of the reinforcing bar, as well as inside the mixture, which restricts the cathodic reaction. This property could be provided by phenolic and limonoid constituents, such as flavonoids and proanthocyanidins [43], which are responsible for the formation of the film [44] During the corrosive activity of ions, the gummy extract inhibited concrete corrosion by limiting the anodic reaction, a mechanism also provided by ginger extract [7], castor oil [19], Arabic gum [45], guar gum [46], and other green inhibitors [22], [25], [47], [48].…”

Section: Probability Of Steel Corrosionmentioning

confidence: 99%

“…In this sense, cedar has been used as a coating on steel, obtaining corrosion inhibitions of up to 46.4 % [17]. Other elements that have been employed as anticorrosive agents include ginger extract [7], maize gluten meal [18], castor oil [19], cactus mucilage, marine brown algae, dehydrated cactus mucilage [20], apricot pomaces [15], Rhizophora mangle L. [9], [21], among others [22]- [25], because they contain compounds and functional groups that act as inhibitors of corrosive mechanisms. Therefore, the present article intends to evaluate the use of cedar exudate as an inhibitor of corrosion caused by the action of chlorides and the probability of steel corrosion in rc.…”

Section: Introductionmentioning

confidence: 99%

Use of Cedrela odorata Linnaeus Exudate for Inhibiting Corrosion by Chlorides in Reinforced Concrete

Barrios-Fontalvo

Tovar

Villabona-Ortíz

et al. 2020

Cien.Ing.Neogranadina

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This paper evaluates the use of cedar tree exudate in chloride penetration and the probability of steel corrosion in reinforced concrete (rc), considering 0.3, 0.5, 0.7, and 0.9 % exudate by cement weight in the mixture at water/cement (w/c) ratios of 0.55 and 0.60. Under these conditions, cylindrical specimens of 4 inches in diameter and 8 inches in height were constructed. The water-sol- uble chloride content of the extracted concrete powder was measured at 0.5, 1.0, and 2.0 cm depth according to astm C1218/C1218M, while the probability of corrosion was determined by measuring electric potentials with astm C876. A favorable incidence of 0.46 % by weight of concrete was found when using 0.7 % exudate at the w/c ratio of 0.55 at the closest depth to the steel, compared to the 0.55 % target. The probability of steel corrosion is reduced to 10 % with potentials higher than -0.2 V with more prolonged exposure to chlorides.

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Ricinus communis – A green extract for the improvement of anti-corrosion and mechanical properties of reinforcing steel in concrete in chloride media

Cited by 67 publications

References 39 publications

Corrosion Inhibition Mechanism of Steel Reinforcements in Mortar Using Soluble Phosphates: A Critical Review

Corrosion Inhibition Mechanism of Steel Reinforcements in Mortar Using Soluble Phosphates: A Critical Review

Synthesis, photophysical, electrochemical, and DFT examinations of two new organic dye molecules based on phenothiazine and dibenzofuran

Use of Cedrela odorata Linnaeus Exudate for Inhibiting Corrosion by Chlorides in Reinforced Concrete

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