Extract of Different Plants of Nepalese Origin as Green Corrosion Inhibitor for Mild Steel in 0.5 M NaCl Solution

Rana, Manoj Kumar; Joshi, Susan; Bhattarai, Jagadeesh

doi:10.14233/ajchem.2017.20449

Cited by 20 publications

(22 citation statements)

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“…The approximate chemical constituents of the mild steel coupons were reported as in wt. (%); C = 0.17, P = 0.05, Si = 0.04, Mn = 0.90, S = 0.05 and balanced by iron as described elsewhere [15,16]. The surface of each sample coupon was mechanically polished with different grades (200-1500 grit) SiC paper using ethanol, rinsed with acetone, and dried by air blowing until the surface exhibited mirror-like reflection to obtain reproducible results from the corrosion as well as the electrochemical tests.…”

Section: Preparation Of Mild-steel Couponmentioning

confidence: 99%

“…The highly toxic nature of the widely used chromiumcontaining organic and inorganic corrosion inhibitors (CIs) in the early stage has motivated now to look the eco-friendly corrosion inhibitors [9,10], because such CIs are quite toxic with their direct impacts on human health, and do not fulfill completely the requirements imposed by the environmental protection standards. Therefore, nowadays, the corrosion control method of metallic materials using various eco-friendly CIs to prevent metallic corrosion is becoming a fundamental research concern of corrosionists, and chemical engineers [11][12][13][14][15][16][17][18][19], because the eco-friendly corrosion inhibitors generally impose zero or negligible toxicity to the environment and human beings.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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: Preparation Of Mild-steel Couponmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…In this condition, the potency of leaves of Nepal origin two plants (i.e., Catharanthus roseus (synonyms: Vinca rosea) and Vitex negundo) explored the first time for minimizing the corrosion level of the reinforced steel rebars in concrete infrastructures. Although previous works reported the effects of these two plant extracts as good anti-corrosion agents to different metals or alloys in acidic [28][29][30], neutral [31,32], and alkaline [33,34] electrolytes. Likewise, the C. roseus extracts acted as a mixed type of inhibitor for mild steel corrosion in an acidic medium due to the formation of an adsorptive film of electrostatic character [29,33].…”

Section: Introductionmentioning

confidence: 99%

“…Likewise, the C. roseus extracts acted as a mixed type of inhibitor for mild steel corrosion in an acidic medium due to the formation of an adsorptive film of electrostatic character [29,33]. Methanol extract of C. roseus leaves acted as an efficient and mixed corrosion inhibitor to the mild steel in NaCl solutions [31,32], usually due to the presence of several functional entities like hydroxyl, carbonyl groups, and fused heterocyclic compounds in the C. roseus extracts which enhanced the corrosion inhibition action. The corrosion inhibition of carbon steel in 1 M HCl containing aqueous extract of V. negundo leaves has been studied using chemical and electrochemical tests, and the results showed that the best concentration of 800 ppm of plant extract showed about 79 % of the inhibition efficiency [30].…”

Section: Introductionmentioning

confidence: 99%

Study on the effects of green-based plant extracts and water-proofers as anti-corrosion agents for steel-reinforced concrete slabs

et al. 2021

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Widespread applications of reinforced concrete structures have been practiced since the 20th century because of their excellent properties despite their early corrosion degradation. For the control of such a problem, a design strategy of corrosion-resistant environments of the reinforced concrete structures is highly desirable for extending of a lifetime. The present research work was focused to investigate the effects of the green plant extract-based inhibitors from Vitex negundo and Catharanthus roseus leaves, and one waterproofing chemical (PtS) for controlling the corrosion susceptibility of concrete rebar using a half-cell potential method following the ASTM C876-91 standard. Both plant extracts have good anti-corrosion properties, and hence could be applied as green concrete additives to increase the corrosion resistance of the steel reinforcing bars. The anti-corrosion performance of the steel rebars in concrete is remarkably higher with the additions of 1000 and 2000 ppm plant extracts than the additions of waterproofing chemicals used, based on the shifting of corrosion potential (ϕcorr.) values to a more positive direction than −126 mV (SCE). The results agreed that both the plant extracts could be promising for the formulation of effective, ecofriendly anti-corrosion additives to delay the corrosion susceptibility of the concrete infrastructures.

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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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Extract of Different Plants of Nepalese Origin as Green Corrosion Inhibitor for Mild Steel in 0.5 M NaCl Solution

Cited by 20 publications

References 0 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

Study on the effects of green-based plant extracts and water-proofers as anti-corrosion agents for steel-reinforced concrete slabs

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

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