Benzenethiols as inhibitors for the corrosion of copper

Sankarapapavinasam, S.; Ahmed, M.F.

doi:10.1007/bf01092694

Cited by 50 publications

(12 citation statements)

References 9 publications

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“…The inhibition efficiency of azorhodanine derivatives increases with the increase of their concentrations and with the increase of the donating substituted groups. 15,16 were tested to fit the experimental data. As shown in the Figure , the curves are straight lines and are characterized by a sharp rise in weight loss from the beginning and the curves for additives containing systems fall below that of the free acid.…”

Section: Resultsmentioning

confidence: 99%

Azorhodanine Derivatives as Inhibitors for Acidic Corrosion of Nickel

2005

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Azorhodanine derivatives (HL1-HL5) were tested as corrosion inhibitors for nickel in 2M HNO3 solution using weight loss and galvanostatic polarization techniques. The results showed that these derivatives act as inhibitors for nickel in this medium. The inhibition was assumed to occur via adsorption of the inhibitor molecule on the metal surface. Polarization measurements indicated that these compounds act as mixed-type inhibitors, but the cathode is more polarized when an external current was applied. This means that these compounds retard the rate of hydrogen evolution and the rate of dissolution of the metal. Results showed that azorhodanine derivatives are adsorbed on the nickel surface following Temkin's adsorption isotherm. The activation energy and thermodynamic parameters were calculated and discussed at different temperatures (30-45 degrees C).

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Section: Resultsmentioning

confidence: 99%

Azorhodanine Derivatives as Inhibitors for Acidic Corrosion of Nickel

2005

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“…This may be attributed due to the presence of energy barrier for the reaction; that is adsorption of the inhibitor leads to rise in enthalpy and free energy. The negative values of the entropy imply that the activated complex in the rate determining step represents an association rather than a dissociation step, meaning that a decrease in disordering takes place on going from reactants to the activated complex 34 . More the negativity of free energy and enthalpy, more is the spontaneity of the reaction.…”

Section: Thermodynamic Parameters For the Metal Dissolution Processmentioning

confidence: 99%

Synthesis of Magnetite-Containing Polyaniline-Polyacrylamide Nanocomposite, Characterization and Corrosion Inhibition Behavior on Mild Steel in Acid Media

2013

Chem Sci Trans

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A novel method for synthesizing magnetite-containing polyaniline-polyacrylamide nanocomposite (PAni-PAAm/Fe 3 O 4 ) nanocomposite has been reported. The synthesized polymer was characterized with Fourier transform infrared spectroscopy (FTIR) and size of the polymer particles was determined using particle analyzer. The corrosion inhibition action of the polymer nanocomposite has been investigated using weight loss measurements, Tafel polarization and electrochemical impedance spectroscopic techniques. The experimental results obtained revealed that the synthesized polymer inhibits the mild steel corrosion in HCl medium and maximum efficiency was obtained at 100 ppm concentration of the inhibitor. Potentiodynamic polarization studies clearly showed that the PAni-PAAm/Fe 3 O 4 acted as mixed inhibitor. Adsorption of the inhibitor on the metal surface obeyed Langmuir adsorption isotherm.

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“…The electronic properties of the inhibitors, the effect of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energies, the difference between highest occupied molecular orbital and lowest unoccupied molecular orbital energies (E LUMO -E HOMO ), charge on the reactive center had to be investigated to achieve the appropriate correlation (Quraishi et al, 1996;Al-Mayouf et al, 1998). Benzothiazoles have been used as corrosion inhibitors for copper (Sankarapapavinasam and Ahmed, 1992). Thiazole derivatives are proved to be effective in protecting copper corrosion in acidic sulfate containing medium.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Evaluation of Corrosion Inhibition Performance of Some Benzenthiol Derivatives for Copper in Acid Media

Al-Baalawi¹,

Muhammed²

2016

Int. J. Curr. Res. Biosci. Plant Biol.

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A b s t r a c t A r t i c l e I n f oThe adsorption mechanism and inhibition performance of two benzenthiol derivatives benzenthiol (BT) and 4-mehtyl-benzenthiol (4-M) and 4-isopropylbenzenthiol (4Iso) were investigated as corrosion inhibitors using semiempirical methods (AM1 and PM3) and ab-nitio (HF). The result showed that the theoretically calculated order was found to be in close agreement with the experimental order. The calculated quantum chemical parameters correlated to the inhibition efficiency are HOMO energy level (highest occupied molecular orbital energy), LUMO energy level (lowest unoccupied molecular orbital energy), the energy gap (ΔE), hardness (η), electrophilicity (ω).

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Benzenethiols as inhibitors for the corrosion of copper

Cited by 50 publications

References 9 publications

Azorhodanine Derivatives as Inhibitors for Acidic Corrosion of Nickel

Azorhodanine Derivatives as Inhibitors for Acidic Corrosion of Nickel

Synthesis of Magnetite-Containing Polyaniline-Polyacrylamide Nanocomposite, Characterization and Corrosion Inhibition Behavior on Mild Steel in Acid Media

Theoretical Evaluation of Corrosion Inhibition Performance of Some Benzenthiol Derivatives for Copper in Acid Media

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