Investigation on some Schiff bases as HCl corrosioninhibitors for copper

Li, Shulan; Chen, Shenhao; Lei, Shengbin; Ma, Houyi; Yu, Rui; Liu, Dexin

doi:10.1016/s0010-938x(98)00183-8

Cited by 189 publications

(71 citation statements)

References 20 publications

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“…The nitrogen atom of azomethine may be involved in the formation of a hydrogen bond with the active centers of cell constituents and interferes in normal cell processes [17,18]. Apart from biological activities, Schiff bases are also used as catalysts, intermediates in organic synthesis, dyes, pigments, polymer stabilizers [3], and corrosion inhibitors [19]. Studies enlightened that metal complexes show greater biological activity than free organic compounds [20].…”

Section: Introductionmentioning

confidence: 99%

Schiff Bases: A Versatile Pharmacophore

Kajal

Bala

Kamboj

et al. 2013

Journal of Catalysts

329

196

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Schiff bases are condensation products of primary amines with carbonyl compounds gaining importance day by day in present scenario. Schiff bases are the compounds carrying imine or azomethine (-C=N-) functional group and are found to be a versatile pharmacophore for design and development of various bioactive lead compounds. Schiff bases exhibit useful biological activities such anti-inflammatory, analgesic, antimicrobial, anticonvulsant, antitubercular, anticancer, antioxidant, anthelmintic, antiglycation, and antidepressant activities. Schiff bases are also used as catalysts, pigments and dyes, intermediates in organic synthesis, polymer stabilizers, and corrosion inhibitors. The present review summarizes information on the diverse biological activities and also highlights the recently synthesized numerous Schiff bases as potential bioactive core.

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Section: Introductionmentioning

confidence: 99%

Schiff Bases: A Versatile Pharmacophore

Kajal

Bala

Kamboj

et al. 2013

Journal of Catalysts

329

196

View full text Add to dashboard Cite

show abstract

“…Fixed concentration of the halides (0.005 M) in combination with various concentrations of Al gum was used for synergistic studies. According to Eddy et al [19], synergism occurs when the combined inhibition efficiency of two or more inhibitors is greater than the sum of the inhibition efficiencies of the individual inhibitors, and that synergism of the corrosion inhibitor is due to the interaction between the components of the inhibitors, or the inhibitor and one of the ions present in aqueous solution. Table 2 presents values of the corrosion rate of mild steel and of the inhibition efficiency of various concentrations of KI, KBr, KCl, Al gum in combination with halides.…”

Section: Resultsmentioning

confidence: 99%

“…Synergism has become one of the most important effects in inhibition processes and serves as the basis for all modern corrosion inhibitor formulations. It is an effective method to improve the inhibitive performance, to decrease the amount of usage, and to diversify the application of the inhibitor in acidic media [19]. Eddy et al [3,20] stated that addition of Br -and I -ions to Lasianthera Africana and Gnetum African leaves extract antagonized their inhibition potentials for mild steel in solutions of H 2 SO 4 , while Cl -exerted synergistic effect in the same media.…”

Section: Introductionmentioning

confidence: 99%

Joint Effect of Anogessius Leocarpus Gum (AL Gum) Exudate and Halide Ions on the Corrosion of Mild Steel in 0.1 M HCl

Ameh¹,

Odiongenyi²,

Eddy³

2012

Port. Electrochim. Acta

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In an attempt to improve the corrosion inhibition potential of Anogessius leocarpus gum exudates for mild steel in solutions of HCl, corrosion inhibition efficiencies of the gum, KI, KCl, and KBr were determined experimentally using weight loss and gasometric methods. 0.05 M KI, 0.05 M KBr and 0.05 M KCl were combined with various concentrations of Anogessius leocarpus gum and their combined inhibition efficiencies were used in computing synergistic parameters for the respective combinations. The results obtained indicated that combination of 0.4 and 0.5 g/L of AL gum with 0.05 M solutions of KI and KBr, respectively, enhanced inhibition efficiency of the gum. However, for all concentrations of AL gum, combinations with 0.05 M KCl recorded a remarkable increase in inhibition efficiency, but calculated values of the synergistic parameter indicated that the adsorption of AL gum on mild steel surface is antagonized by the presence of Cl -. Theory of competitive and co-operative adsorption has been used to explain the co-adsorption of the gum and the halides. From calculated values of activation energy (< 80kJ/mol), free energy of adsorption (< -40 kJ/mol) and the variation of inhibition efficiency with temperature, the adsorption characteristics of the gum, halides and that of gum-halide mixtures were found to be consistent with the mechanism of physical adsorption. The adsorption was also found to be endothermic, spontaneous and favored the Langmuir adsorption model.

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“…The heteroatoms present in these molecules are of key importance and are responsible for the corrosion inhibition in acidic media on the metal surface [1][2][3]. Some recently reported Schiff bases showed effective inhibition for mild steel (MS), aluminum, copper, and zinc in acidic media [4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

3-Formylindole-4-aminobenzoic Acid: A Potential Corrosion Inhibitor for Mild Steel and Copper in Hydrochloric Acid Media

et al. 2012

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The corrosion inhibition efficiencies of Schiff base 3-formylindole-4-aminobenzoic acid (3FI4ABA) on mild steel (MS) and copper in 1.0 M HCl solution have been investigated using weight loss measurements, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization studies. The results show that inhibition efficiencies on both metals increase with increasing the concentration of the inhibitor. 3FI4ABA exhibited comparatively good inhibition towards mild steel in HCl medium even at low concentrations. The adsorption of inhibitor on the surfaces of the corroding metal mild steel and copper obeys the Langmuir isotherm. Polarization studies revealed that 3FI4ABA acts as a mixed-type inhibitor. Thermodynamic parameters (K ads , ΔG 0 ads ) were calculated using the Langmuir adsorption isotherm.

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Investigation on some Schiff bases as HCl corrosioninhibitors for copper

Cited by 189 publications

References 20 publications

Schiff Bases: A Versatile Pharmacophore

Schiff Bases: A Versatile Pharmacophore

Joint Effect of Anogessius Leocarpus Gum (AL Gum) Exudate and Halide Ions on the Corrosion of Mild Steel in 0.1 M HCl

3-Formylindole-4-aminobenzoic Acid: A Potential Corrosion Inhibitor for Mild Steel and Copper in Hydrochloric Acid Media

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