Berberine isolated from Mahonia nepalensis as an eco-friendly and thermally stable corrosion inhibitor for mild steel in acid medium

Karki, Nabin; Neupane, Shova; Gupta, Dipak Kumar; Das, Anju Kumari; Singh, Sanjay; Koju, Gayatri Maiya; Chaudhary, Yogesh; Yadav, Amar Prasad

doi:10.1016/j.arabjc.2021.103423

Cited by 33 publications

(23 citation statements)

References 60 publications

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“…cathodic hydrogen evolution reaction, resulting in the decrease in total reaction volume. The values of E a and ∆H* also confirm the adsorption of the alkaloid by both physical and chemical interactions [22,24]. Calculated values of E a , ΔH°, and ΔS° for acid without and with inhibitor are tabulated in Table 4.…”

Section: Activation Energy and Thermodynamic Parametersmentioning

confidence: 60%

“…These calculated values are intermediate values between physical (less than or equal to 20 kJ/mol) and chemical interactions (more than 80 kJ/mol). Therefore, the adsorption of alkaloids on MS surface in 1M H 2 SO 4 solution involves chemical-dominated physical interaction [24].…”

Section: Activation Energy and Thermodynamic Parametersmentioning

confidence: 99%

“…In addition to inhibitor, ∆S* value increases as negative 31.02, 12.72, and 15.38 J -1 mol -1 K for 200, 600, and 1000 ppm inhibitor solutions, respectively. This implies that the randomness increased in the transition state due to the replacement of water molecules with alkaloid molecules [24].…”

Section: Activation Energy and Thermodynamic Parametersmentioning

confidence: 99%

“…This indicates that ANA might act as a mixed type of inhibitor. The positive shifting of potential from OCP indicates the formation of a protective layer by ANAs in acid solution on the MS surface that limits the interaction of aggressive ions with the MS surface [24].…”

Section: Electrochemical Measurements Open Circuit Potential (Ocp) Me...mentioning

confidence: 99%

“…Similarly, H 2 O(ads) represents the adsorbed water molecules on the MS surface, and x represents the size ratio i.e. the number of water molecules that are replaced by one organic molecule [24].…”

Section: Potentiodynamic Polarization Measurementmentioning

confidence: 99%

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Alkaloids extract of Alnus nepalensis bark as a green inhibitor for mild steel corrosion in 1 M H2SO4 solution

Dhakal

Bohora

Bista

et al. 2022

J. Nepal Chem. Soc.

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Extraction of alkaloids from Alnus nepalensis bark has been successfully carried out and used as a green inhibitor for mild steel corrosion exposed to 1 M H2SO4 solution. Alkaloids have been tested by chemical, UV and FTIR spectroscopic methods.Corrosion inhibition was monitored by weight loss measurement and electrochemical methods(open circuit potential method and potentiodynamic polarization method). Weight loss measurement was employed to study the inhibitor concentration and immersion time effect. Similarly, the temperature effect on inhibition efficiency was also carried out by this method. The maximum corrosion inhibition efficiency observed for 1000 ppm solution for 3 h was 71.94 % at 25 °C. The OCP measurement revealed that alkaloids acted as a mixed type of inhibitor. Potentiodynamic polarization for 3 h immersed samples in the presence and absence of inhibitors was carried out. The corrosion current density was decreased with the increasing concentration. The maximum efficiency of immersed sample in 1000 ppm inhibitor solution was 78.48 %. The adsorption isotherm and thermodynamic parameters were calculated and the energy of activation (Ea) was found to be 71.41 kJ/mol. The positive value of enthalpy indicated that the reaction involves is endothermic.

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Section: Activation Energy and Thermodynamic Parametersmentioning

confidence: 60%

Section: Activation Energy and Thermodynamic Parametersmentioning

confidence: 99%

Section: Activation Energy and Thermodynamic Parametersmentioning

confidence: 99%

Section: Electrochemical Measurements Open Circuit Potential (Ocp) Me...mentioning

confidence: 99%

Section: Potentiodynamic Polarization Measurementmentioning

confidence: 99%

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