Mitigation of concrete reinforced steel corrosion by penta sodium triphosphate: physicochemical and electrochemical investigations

Paulson, Binsi M.; Thomas, K. Joby; Raphael, Vinod P.; Shaju, K. S.; Ragi, K.

doi:10.1007/s42452-020-03586-1

Cited by 12 publications

(5 citation statements)

References 59 publications

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“…More recently, the use of alternative pentasodium triphosphate compounds Na 5 P 3 O 10 , also known as sodium tripolyphospate, has shown an increased inhibition efficiency of around 80% for 480 days exposure in 3.5% NaCl, which is attributed to the development of a protective film barrier of PST on the steel rebar surface. Potentiodynamic polarization results revealed that PST affects the anodic and cathodic sites uniformly, thus presenting a mixed-type corrosion-inhibitor protection mechanism [54]. The use of inorganic corrosioninhibitor mixtures containing hexametaphosphate compounds (NaPO 3 ) 6 , used in 3.5% NaCl contained SCPS, have been proven to reduce the corrosion rate by 8.60 and 25.52 times for 3 and 5% inhibitor addition, respectively [55].…”

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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“…[68] These plant constituents are responsible for the formation of stable diffusion-barrier layers on the steel surface by an adsorption mechanism that isolates the steel from the corrosive concrete environments. [69,70] Consequently, the extent of corrosion level of the SRC infrastructures extended for a long time.…”

Section: Inhibitory Potentiality Of Cement-based Additivesmentioning

confidence: 99%

Comparative Studies on the Anti‐Corrosive Action of Waterproofing Agent and Plant Extract to Steel Rebar

Somai

Giri

Roka

et al. 2023

Macromolecular Symposia

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Reinforcement of steel rebar in concrete infrastructure practices for a long time, mostly to improve tensile strength as well their service time. However, shortcomings related to damage of reinforced concrete (RfC) infrastructures becomes the business of corrosion researchers over the past few years, primarily from a safety and economic perspective. In general, the steel‐reinforced concrete (SRC) infrastructures are porous, and thence water as well different atmospheric pollutant gases penetrate it, causing the corrosion damages of the rebar, which shorten the prolonged existence of the RfC structures. The research aims to differentiate the efficacy and prosperity of waterproofing chemicals and methanol extract of Mangifera indica plant leaves for controlling the RfC susceptibility using a half‐cell corrosion potential measurement method following ASTM standard. The methanolic extract of M. indica leaves and waterproofing agents show high anti‐corrosion characteristics and can prescribe for the protection of the RfC infrastructures. The corrosion controlling performance level of 1000 and 2000 ppm M. indica extracts on the steel rebars in concrete has higher than the additions of alike concentration of both the water‐repellents depend on open‐circuit corrosion potential (CoP) shifting values to a noble direction.

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“…It is also known that the formation of hydrated iron oxide and pitting corrosion of chlorides, sulfates, uorides, nitrates, and so forth expands steel bars, generating internal pressure in the surrounding concrete, which in turn causes structural degradation in the carcass of the buildings 43 . To overcome this drawback, micro lament steel (MS) bers with low ber content are incorporated into concrete 44 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical and Corrosion Behavior of Amorphous 316-type Stainless Steel Microfibers in Saline Environment

Sarac

Sharifikolouei

Zheng

et al. 2023

Preprint

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The resistance of commercial stainless steel (SS) types in harsh environments is problematic because of the breakdown of the passive chromium oxide layer. This study reports fully amorphized 316 SS microfibers using a customized multi-nozzled melt-spinning technique. Electrochemical tests in 3.5 wt.% NaCl shows a high corrosion resistance with an annual corrosion rate of less than 60 µm year–1 under ambient conditions, which increases slightly as the temperature rises to 50°C. The room temperature sample also shows a low passivation current at the level of 10–4 A cm–2 with long-term stability, and no pitting is observed for all the samples until 1.5 V. The sample polarized at 37°C shows the smallest bulk resistance (~ 1400 Ω cm2) and the largest double-layer capacitance (28.6 µF cm–2), where large amounts of salt accumulation on the surface creating a passive layer on the microfibers were detected by energy dispersive X-ray (EDX)–scanning electron microscopy. Cross-sectional investigation by EDX-scanning transmission electron microscopy corroborates the homogenous bulk composition and Fe-rich, Ni and Cr-containing amorphous oxides, both of which contribute to the enhanced corrosion and passivation properties compared to commercial SS counterparts in the literature.

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Mitigation of concrete reinforced steel corrosion by penta sodium triphosphate: physicochemical and electrochemical investigations

Cited by 12 publications

References 59 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

Comparative Studies on the Anti‐Corrosive Action of Waterproofing Agent and Plant Extract to Steel Rebar

Enhanced Electrochemical and Corrosion Behavior of Amorphous 316-type Stainless Steel Microfibers in Saline Environment

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