Adsorption and Quantum Chemical Studies on the Inhibition Potential of Mannich Base for the Corrosion of Brass in Acid Medium

Zulfareen, N.; Kannan, K.; Venugopal, T.; Gnanavel, S.

doi:10.1007/s13369-016-2088-4

Cited by 9 publications

(10 citation statements)

References 21 publications

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“…In this study the polished, pre-cleaned and weighed mild steel specimens were immersed in 100 ml of 1.0 M aerated nitric acid solution without and with the addition of various concentrations of KYNA for a period of 3 h and the temperature range was set from 303 to 328 K. The experiments were carried out in triplicate and the mean values were reported. From this study, the weight loss corrosion parameters such as corrosion rate (W), surface coverage (θ) and inhibition efficiency (η%) were calculated by the following equations [22,28,29]:…”

Section: Chemical Method: Weight Loss Studymentioning

confidence: 99%

“…The KYNA inhibitor has a very large value of global softness (12.47 eV) owing to that the soft molecules are more reactive than hard molecules, because they offer electrons to the acceptors easily [29]. The inhibitor molecule associated with lower ΔE value is also related to high softness, lower hardness and high chemical reactivity and thereby high protection ability [78,79].…”

Section: Quantum Chemical Analysismentioning

confidence: 99%

“…The Mulliken atomic charge of KYNA molecules was calculated using B3LYP/6-31+G (d, p) method within the framework of DFT. An atomic charge of KYNA molecules was used to delineate the electro-negativity process and transfer of charges in a chemical reaction [29]. The atomic charges of KYNA molecule are summarized in Table 12.…”

Section: Mulliken Charge Analysismentioning

confidence: 99%

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Experimental and computational approach of an expired antibiotic drug Kynurenic acid as an efficient corrosion inhibitor for mild steel in HNO3 medium

et al. 2021

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An expired antibiotic drug Kynurenic acid (KYNA) was investigated for its adsorption and corrosion inhibition performance on mild steel (MS) in 1.0 M HNO 3 solution. Chemical methods like weight loss measurement, electrochemical methods like impedance spectroscopy, potentiodynamic polarization and linear polarization measurements were used to identify the adsorption behavior of KYNA in HNO 3 solution. The inhibition efficiency improved with an increase in KYNA concentration in nitric acid medium. The adsorption process of KYNA was spontaneous and favored Langmuir adsorption isotherm. Potentiodynamic polarization measurements indicate that the evaluated inhibitor acts as mixed type. The values of thermodynamic and activation parameters (R 2 and ΔG ads 0 ) were calculated and discussed. The surface morphology of MS was characterized by using scanning electron microscopy, atomic force microscopy, Fourier transforms infrared spectroscopy and theoretical study. From both the experimental and theoretical studies, the investigated inhibitor molecule exhibited surface active properties and performed as a good inhibitor for corrosion control of MS in nitric acid medium. The experimental results corroborated with results obtained from theoretical molecular dynamics simulation with density functional theory studies.

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Section: Chemical Method: Weight Loss Studymentioning

confidence: 99%

Section: Quantum Chemical Analysismentioning

confidence: 99%

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Experimental and computational approach of an expired antibiotic drug Kynurenic acid as an efficient corrosion inhibitor for mild steel in HNO3 medium

et al. 2021

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“…Brass, an alloy of copper and zinc, generally has a zinc content ranging from 30% to 39% with zinc percentages affecting the properties of the alloy. Brass is commonly used in marine applications, tubing, pipelines, and electronic equipment owing to its excellent thermal conductivity and corrosion resistance [ 3 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, brass surfaces are susceptible to atmospheric corrosion over time, and this can lead to formation of large scale and corrosion products [ 3 , 4 , 7 , 8 ]. This can severely affect the thermal conducting ability of brass [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Inhibition Effect of Pyridine-2-Thiol for Brass in An Acidic Environment

et al. 2022

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In this study, the inhibitive performance of pyridine-2-thiol added to a corrosive solution was investigated for brass using potentiodynamic polarization, electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy. Electrochemical experiments were performed with different inhibitor concentrations in 0.5 M H2SO4 as the corrosive medium. For potentiodynamic polarization, icorr values decreased significantly for the inhibited solutions in contrast with the uninhibited solution. Pyridine-2-thiol had an optimum inhibition concentration of 0.25 mM, giving an icorr value of 1.8 µA/cm2 compared to 26 µA/cm2 for the blank solution. EIS data indicated that Rp and Rct values increased substantially after the addition of the corrosion inhibitor and corrosion inhibition efficiencies of more than 85% was achieved for the majority of the inhibited solutions. Scanning electron microscopy showed defect free and less scale formation for the inhibited surface but the bare brass surface had larger amounts of scale formation. X-ray photoelectron spectroscopy and UV-vis spectroscopy was used to investigate surface chemical composition and inhibitor structural changes over time.

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Synthesis, characterization and anticancer activity of Ni(II), Cu(II), Pd(II) and Au(III) complexes derived from novel Mannich base

Manhee,

Alabdali

2024

Vietnam Journal of Chemistry

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New four complexes of Ni(II), Cu(II), Pd(II), and Au(III) were derived from the tridentate ligand 3‐((3‐(4‐hydroxyphenyl)‐5‐mercapto‐4H‐1,2,4‐triazol‐4‐yl)(3‐oxobutyl)amino)naphtho[2,3‐b]furan‐2(3H)‐one (L), which synthesized using condensation reaction of formaldehyde, acetone, and secondary amine (Mannich reaction). The secondary amine is a heterocyclic compound possesses two rings, naphthafuran and triazole, both rings prepared through intermolecular cyclization reactions. Considering that naphthafuran‐2‐one derived from α‐amino nitrile. The α‐amino nitrile compound contains the other triazole ring which illustrated to the structure through successive steps. The compounds were characterized using elemental analysis (C.H.N.S), FT‐IR, ultraviolet–visble spectroscopy, thermal gravimetric analysis (TGA), flame atomic absorption, molar conductivity, and magnetic susceptibility measurements. Accordingly, the probable geometries of the complexes were suggested as square planner, and they have electrolytic nature. Thus, chemical formula; [NiLCl]Cl·6H2O, [CuLCl]Cl·2H2O, [PdLCl]Cl·2H2O, and [AuLCl]Cl2·3H2O. Cytotoxic effect was studied on brain cancer cell line (AMJM cell line) at different concentrations for L and complexes. The results showed that gold(III) complex has the highest cytotoxicity among all compounds.

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Adsorption and Quantum Chemical Studies on the Inhibition Potential of Mannich Base for the Corrosion of Brass in Acid Medium

Cited by 9 publications

References 21 publications

Experimental and computational approach of an expired antibiotic drug Kynurenic acid as an efficient corrosion inhibitor for mild steel in HNO3 medium

Experimental and computational approach of an expired antibiotic drug Kynurenic acid as an efficient corrosion inhibitor for mild steel in HNO3 medium

Corrosion Inhibition Effect of Pyridine-2-Thiol for Brass in An Acidic Environment

Synthesis, characterization and anticancer activity of Ni(II), Cu(II), Pd(II) and Au(III) complexes derived from novel Mannich base

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