Assessment on Corrosion Damage of Steel Reinforced Concrete Structures of Kathmandu Valley Using Corrosion Potential Mapping Method

Phulara, Nav Raj; Bhattarai, Jagadeesh

doi:10.3126/jie.v15i2.27640

Cited by 8 publications

(6 citation statements)

References 11 publications

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“…Extensive research has led to the discovery of a new class of corrosion inhibitors that are eco-friendly. Previous studies were reported about the corrosion behavior of different ferrous structural materials used in Nepal in different corrosive environments [42][43][44][45][46][47][48][49][50][51], although a few studies were focused on the effects of eco-friendly plant-extracted green inhibitors on the mild steel corrosion [14,15,18]. In this context, the present work was aimed to study the effects of four inorganic compounds; Ca(NO 3 ) 2 , ZnSO 4 , (…”

Section: Introductionmentioning

confidence: 99%

Appraisal of Different Inorganic Inhibitors Action on the Corrosion Control Mechanism of Mild Steel in HNO3 Solution

Magrati

Subedi

Pokharel

et al. 2020

J. Nepal Chem. Soc.

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Effects of eco-friendly inorganic inhibitors (i.e., calcium nitrate, zinc sulfate, sodium hexametaphosphate and sodium tetra-borate or borax) for the mild steel corrosion control in 1 M HNO3 solution open to air at 28±1 °C were studied using corrosion, inhibition efficiency, and corrosion potential tests. The corrosion rate of the mild steel is increased with increasing the concentrations of HNO3 solution from 0.01 M to 1 M. The uses of 200-2400 ppm of these inhibitors enhanced the corrosion resistance properties of the mild steel in 1 M HNO3 solution. The corrosion resistance property of the mild steel is generally decreased with increasing the concentration of all corrosion inhibitors used here. The most efficient corrosion inhibitor is found to be calcium nitrate and it is followed by zinc sulfate, sodium hexametaphosphate, and borax subsequently. Adsorption of these inorganic salts inhibitors on the mild steel surface obeyed Langmuir adsorption isotherm. Consequently, the corrosion inhibition mechanism of the four inorganic salts for the mild steel corrosion control can be explained based on the formation of the passive film. It is found from the corrosion potential measurement that the cathodic type of corrosion inhibition action was by calcium nitrate, whereas zinc sulfate, sodium hexametaphosphate, and borax are acted as a mixed type of the inhibitors in 1 M HNO3 solution. In summary, all four inorganic inhibitors utilized in the present study can be applied as an environmentally friendly inhibitor to control the corrosion of the mild steel in aggressive HNO3 solutions.

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Section: Introductionmentioning

confidence: 99%

Appraisal of Different Inorganic Inhibitors Action on the Corrosion Control Mechanism of Mild Steel in HNO3 Solution

Magrati

Subedi

Pokharel

et al. 2020

J. Nepal Chem. Soc.

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“…The CoP of each steel bar was recorded on a digital multi‐meter (UNI‐T Business, Hong Kong) using a saturated calomel electrode (SCE) and exposed steel rod of the concrete slab as a reference and working electrodes, respectively, as described elsewhere. [ 44 ] Eight points, marked like pt‐1, pt‐2, pt‐3, pt‐4, pt‐5, pt‐6, pt‐7, and pt‐8 at equidistant from the sides, were marked on each SCR slab surface. The SCE and steel rod was connected, respectively, to the negative and positive terminals of the voltmeter for the CoP measurement of all eight points of each slab after 1 week to about 5 months.…”

Section: Methodsmentioning

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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“…[36] Besides, the XPS surface analysis confirmed the formation of iron oxy-hydroxy (FeOOH) species, which developed the hypothesis on the responsibility of iron-polyphenol insoluble organometallic compounds for anticorrosive properties. [37] However, to the best of the author's knowledge and belief, the anticorrosive behavior of the LEPG and its blend with LEMI to the SRC structures have not been virtually clarified yet, although few studies reported the corrosion conditions of different steel materials in concrete infrastructures, [39,40] and in soil environments [41][42][43][44] of Nepal. In this vein, current research explores a viable cement-based additive as an anticorrosive substance derived from the untapped leaf part of Nepal-origin M. indica and P. guajava plants to monitor the corrosion condition of steel bars embedded in the concrete slab.…”

Section: Introductionmentioning

confidence: 99%

Performance of Anticorrosive Measures of Steel in Concrete Infrastructure by Plant‐Based Extracts

Giri

Gautam

Roka

et al. 2023

Macromolecular Symposia

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Competence to combat corrosion of steel‐reinforced concrete (SRC) infrastructures for long periods has become a fascinating topic for corrosion scientists. The longevity of such infrastructures is limited mainly by the corrosion process. Hence, urgent demands for developing effective and practical methods are necessary to minimize the corrosion of such concrete structures. The anti‐corrosive components can be designed from the green plants' parts to mitigate the SRC corrosion in recent years. The ongoing research aims to substantiate the success of the leaf extract of Psidium guajava (LEPG) and its 50% blend (BnD) with the leaf extract of Mangifera indica (LEMI) for assessing the steel corrosion condition in a concrete slab. For this purpose, a fast corrosion potential monitoring (CPM) method is applied per the ASTM procedure. Outcomes of the work summarized that the additions of 500–4000 ppm LEPG and its 50% BnD blend have significant corrosion‐inhibiting action. The corrosion potential (ϕcorr) shifts toward a less corrosion‐risk area of the steel bar for 6 months at ambient conditions.

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Assessment on Corrosion Damage of Steel Reinforced Concrete Structures of Kathmandu Valley Using Corrosion Potential Mapping Method

Cited by 8 publications

References 11 publications

Appraisal of Different Inorganic Inhibitors Action on the Corrosion Control Mechanism of Mild Steel in HNO3 Solution

Appraisal of Different Inorganic Inhibitors Action on the Corrosion Control Mechanism of Mild Steel in HNO3 Solution

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

Performance of Anticorrosive Measures of Steel in Concrete Infrastructure by Plant‐Based Extracts

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