New bipyrazole derivatives as effective inhibitors for the corrosion of mild steel in 1M HCI medium

Ouafi, A. El; Hammouti, B.; Oudda, H.; Kertit, S.; Touzani, Rachid; Ramdani, Abdelkrim

doi:10.1108/00035590210426463

Cited by 65 publications

(28 citation statements)

References 13 publications

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“…The higher values of Tafel slope can be attributed to surface kinetic process rather the diffusion-controlled process [28]. The constancy and the parallel of cathodic slope obtained from the electrochemical measurements indicate that the hydrogen evolution reaction was activation controlled [29] and the addition of these derivatives did not modify the mechanism of this process. This result suggests that the inhibition mode of the thiadiazole derivatives used was by simple blockage of the surface by adsorption.…”

Section: Potentiodynamic Polarizationmentioning

confidence: 87%

Role of some thiadiazole derivatives as inhibitors for the corrosion of C-steel in 1 M H2SO4

Fouda

Heakal

Radwan³

2008

J Appl Electrochem

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Inhibition of C-steel corrosion by some thiadiazole derivatives (I-VI) in 1 M H 2 SO 4 was investigated by weight loss, potentiodynamic polarization, linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) techniques. The presence of these compounds in the solution decreases the double layer capacitance, increases the charge transfer resistance and increase of linear polarization. Polarization studies were carried out at room temperature, and showed that all the compounds studied are mixed type inhibitors with a slight predominance of cathodic character. The effect of temperature on corrosion inhibition has been studied and the thermodynamic activation and adsorption parameters were calculated and discussed. Electrochemical impedance was used to investigate the mechanism of corrosion inhibition. The adsorption of the compounds on C-steel was found to obey Langmuir's adsorption isotherm. The synergistic effect brought about by combination of the inhibitors and KSCN, KI and KBr was examined and explained. The mechanism of inhibition process was discussed in the light of the chemical structure and quantum-chemical calculations of the investigated inhibitors.

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Section: Potentiodynamic Polarizationmentioning

confidence: 87%

Role of some thiadiazole derivatives as inhibitors for the corrosion of C-steel in 1 M H2SO4

Fouda

Heakal

Radwan³

2008

J Appl Electrochem

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“…Several adsorption isotherms were examined to adjust the values of the degree of the cover surface, following the Langmuir isotherm, [54][55][56][57][58] given by the following relationships (10):…”

Section: Isotherm and Thermodynamic Parameters Of Adsorptionmentioning

confidence: 99%

Synthesis and characterization of new quinoxaline d erivatives of 8- hydroxyquinoline as corrosion inhibitors for mild s teel in 1.0 M HCl medium

Rbaa¹,

Galai²,

Faydy³

et al. 2018

jmes

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“…It is well known that pyrazole [8][9][10], bipyrazole [11][12][13][14][15][16], tripyrazole [17], triazole [18][19][20] and tetrazole [5,21] derivatives are excellent inhibitors of corrosion of many metals and alloys in aggressive media. Substitution in the pyrazole ring (R = H, CH 3 , CO 2 C 2 H 5 , etc.)…”

Section: Introductionmentioning

confidence: 99%

The effect of 1′,3,5,5′-tetramethyl-1′H-1,3′-bipyrazole on the corrosion of steel in 1.0 M hydrochloric acid

et al. 2011

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The effect of some prepared compounds, namely 3,5-dimethyl-1H-pyrazole (P1), 3(5)-amino-5(3)-methylpyrazole (P2), and 1 0 ,3,5,5 0 -tetramethyl-1 0 H-1,3 0 -bipyrazole (P3), on the corrosion behaviour of steel in 1.0 M hydrochloric acid solution as corrosive medium has been investigated at 308 K using weight-loss measurement, potentiodynamic polarisation, linear polarisation, and impedance spectroscopy (EIS). Generally, inhibition efficiency of the investigated compounds was found to depend on the concentration and nature of the inhibitor. P3 was a better inhibitor than P1 and P2, and its inhibition efficiency increased with increasing concentration of inhibitor, attaining 94% above 10 -3 M. Potentiodynamic polarisation studies clearly reveal that P3 acts essentially as a cathodic inhibitor. E (%) values obtained from different methods are in reasonably good agreement. EIS measurements show an increase of transfer resistance with inhibitor concentration. Partial p-charge on atoms was calculated. Correlation between the highest occupied molecular orbital energy E HOMO and inhibition efficiencies was sought. The temperature effect on the corrosion behaviour of steel in 1.0 M HCl without and with different concentrations of inhibitor P3 was studied in the temperature range 308 to 343 K. Thermodynamic data, for example heat of adsorption (DH ads ), entropy of adsorption (DS ads ) and free energy of adsorption (DG ads ) were calculated by use of thermodynamic equations. Kinetic activation data, for example E a , DH*, DS* and pre-exponential factor, were calculated, and are discussed. The inhibiting action of P3 on the corrosion of steel in 1-10 M hydrochloric acid was also studied by weight-loss measurement. The rate constant and reaction constant were calculated for the corrosion reactions. Adsorption of P3 on the steel surface in 1.0 M HCl follows the Langmuir isotherm model.

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New bipyrazole derivatives as effective inhibitors for the corrosion of mild steel in 1M HCI medium

Cited by 65 publications

References 13 publications

Role of some thiadiazole derivatives as inhibitors for the corrosion of C-steel in 1 M H2SO4

Role of some thiadiazole derivatives as inhibitors for the corrosion of C-steel in 1 M H2SO4

Synthesis and characterization of new quinoxaline d erivatives of 8- hydroxyquinoline as corrosion inhibitors for mild s teel in 1.0 M HCl medium

The effect of 1′,3,5,5′-tetramethyl-1′H-1,3′-bipyrazole on the corrosion of steel in 1.0 M hydrochloric acid

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