Theoretical and experimental studies on the corrosion inhibition potentials of 3-nitrobenzoic acid for mild steel in 0.1 M H<sub>2</sub>SO<sub>4</sub>

Ameh, Paul Ocheje; Eddy, Nnabuk Okon

doi:10.1080/23312009.2016.1253904

Cited by 31 publications

(14 citation statements)

References 24 publications

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“…The withdrawn metal coupon was washed dried and weighed. From the difference in weight, weight loss, corrosion rate and inhibition efficiency were calculated using the following equations [11]:…”

Section: Weight Loss Experimentsmentioning

confidence: 99%

Experimental and computational chemistry studies on the inhibition of aluminium and mild steel in 0.1 M HCl by 3-nitrobenzoic acid

Eddy

Ameh

Essien

2018

Journal of Taibah University for Science

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The effectiveness of 3-nitrobenzoic acid towards the inhibition of the corrosion of mild steel and aluminium in solution of HCl was investigated using theoretical and experimental methods (weight loss, thermometric, polarization, FTIR and SEM techniques). Inhibition efficiency of 3-nitrobenzoic acid, evaluated from weight loss technique ranged from 71% to 90% and from 71% to 82% for mild steel and aluminium, respectively. Results from linear polarization and potentiodynamic studies were comparable to weight loss results. Calculated kinetic (activation energy), thermodynamic (changes in entropy and enthalpy) and adsorption parameters indicated that the adsorption of the inhibitor on the surface of the respective metal is accompanied by molecular association and is endothermic, spontaneous and favoured the mechanism of physical adsorption. Best-fitted adsorption isotherms were Langmuir and Frumkin models, which gave evidences for the existence of interaction, characterized by attractive behaviour of the inhibitor on both mild steel and aluminium surfaces. Scanning electron micrographs of the metal before and after inhibition clearly revealed that the inhibitor prevented crevice and pitting corrosion by forming adsorbed protective layer on the respective metal surface. FTIR spectra of the inhibitor and the corrosion products indicated the formation of new bond, existence of interaction between the inhibitor molecules and the involvement of some functional groups in the adsorption and inhibition processes. Quantum chemical study revealed that the inhibitor is adsorbed on the metal surface through the nitro functional group in the ring. Calculated semi empirical parameters were comparable to those reported for excellent corrosion inhibitors.

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Section: Weight Loss Experimentsmentioning

confidence: 99%

Experimental and computational chemistry studies on the inhibition of aluminium and mild steel in 0.1 M HCl by 3-nitrobenzoic acid

Eddy

Ameh

Essien

2018

Journal of Taibah University for Science

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“…Therefore, there are two major Fukui functions corresponding to N− 1 and N + 1 systems, respectively. These are defined according to the following equations [42],…”

Section: Desorption Studymentioning

confidence: 99%

Experimental and computational chemistry studies on the removal of methylene blue and malachite green dyes from aqueous solution by neem (Azadirachta indica) leaves

Odoemelam

Emeh

Eddy

2018

Journal of Taibah University for Science

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Adsorption of methylene blue and malachite green dyes from aqueous solution by neem leaves was studied using experimental and computational chemistry approaches. The two dyes have N-H stretch, C≡C vibration vibration, C=C stretch and C-Cl stretch as common functional groups. Batch adsorption experiments were concluded by measuring absorbance (at wavelength of maximum absorption, i.e. 660 and 630 nm for methylene blue and malachite green dyes, respectively). The adsorption of the dyes on neem leaves favoured Langmuir and Temkin isotherms and was influenced by concentration, biomass dose, pH and by contact time, and favoured chemisorption mechanism. Although surface adsorption and intra particle diffusion were identified as the rate-limiting steps, a pseudo second-order kinetics was also favoured. Quantum chemical analysis supported better adsorption of methylene blue dye on neem seed surface than malachite green dye and through Fukui function analysis, the site for adsorption of the dyes was proposed.ARTICLE HISTORY

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“…Corrosion current density can be translate a into the corrosion inhibition efficiency (IE) using following equation [33][34][35]:…”

Section: Linear Polarisation Resistancementioning

confidence: 99%

Gemini surfactant as multifunctional corrosion and biocorrosion inhibitors for mild steel

Pakiet

Kowalczyk

Garcı́a

et al. 2019

Bioelectrochemistry

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Biocorrosion is an important type of corrosion which leads to economic losses across oli and gas industries, due to increased monitoring, maintenance, and a reduction in platform availability. Anaerobic sulfate reducing bacteria (SRB) are known to accelerate the rate of corrosion tenfold, by secreting specific enzymes. Mitigation strategies include: (i) cleaning procedures; (ii) addition of microbiocides; (iii) antifouling coatings and (iv) cathodic protection. Ideally, a chemical compound engineered to mitigate against biocorrosion would possess both antimicrobial properties, as well as efficient corrosion inhibition. Gemini surfactants have shown efficacy in both of these properties, however there still remains a lack of electrochemical information regarding biocorrosion inhibition. The inhibition of corrosion and biocorrosion, by cationic gemini surfactants, of carbon steel was investigated. The results showed that the inhibition efficiency of the gemini surfactants was high (consistently > 95 %), even at low concentrations, with the most efficient concentration being above the critical micelle concentration (CMC). Gemini surfactants also showed strong antimicrobial activity, with a minimum inhibitory concentration (0.018 mM). Corrosion inhibition was investigated by electrochemical impedance spectroscopy (EIS) and linear polarisation resistance (LPR), with biocorrosion experiments carried out in an anaerobic environment. Surface morphology was analysed using scanning electron microscopy (SEM).

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Theoretical and experimental studies on the corrosion inhibition potentials of 3-nitrobenzoic acid for mild steel in 0.1 M H₂SO₄

Cited by 31 publications

References 24 publications

Experimental and computational chemistry studies on the inhibition of aluminium and mild steel in 0.1 M HCl by 3-nitrobenzoic acid

Experimental and computational chemistry studies on the inhibition of aluminium and mild steel in 0.1 M HCl by 3-nitrobenzoic acid

Experimental and computational chemistry studies on the removal of methylene blue and malachite green dyes from aqueous solution by neem (Azadirachta indica) leaves

Gemini surfactant as multifunctional corrosion and biocorrosion inhibitors for mild steel

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Theoretical and experimental studies on the corrosion inhibition potentials of 3-nitrobenzoic acid for mild steel in 0.1 M H2SO4

Cited by 31 publications

References 24 publications

Experimental and computational chemistry studies on the inhibition of aluminium and mild steel in 0.1 M HCl by 3-nitrobenzoic acid

Experimental and computational chemistry studies on the inhibition of aluminium and mild steel in 0.1 M HCl by 3-nitrobenzoic acid

Experimental and computational chemistry studies on the removal of methylene blue and malachite green dyes from aqueous solution by neem (Azadirachta indica) leaves

Gemini surfactant as multifunctional corrosion and biocorrosion inhibitors for mild steel

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Theoretical and experimental studies on the corrosion inhibition potentials of 3-nitrobenzoic acid for mild steel in 0.1 M H₂SO₄