Corrosion inhibition of copper in chloride solutions by pyrazole

Geler, Elizabeth; Azambuja, Denise Schermann

doi:10.1016/s0010-938x(99)00080-3

Cited by 104 publications

(44 citation statements)

References 29 publications

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“…From the relative current of the two peaks (peaks 1 and 2 of Figures 3(a) and 3(b)), it could be concluded that at higher polarization potential copper preferably dissolved as soluble Cu(II) soluble species and the proportion of formation of soluble Cu(I) species was reduced. The literature's [38][39][40][41] reports about the mechanism of dissolution of copper in aqueous solution agreed well with the present observation from RRDE measurements.…”

Section: Rotating Ring-disc Electrode Studysupporting

confidence: 92%

Electrochemical Study on Corrosion Inhibition of Copper in Hydrochloric Acid Medium and the Rotating Ring-Disc Voltammetry for Studying the Dissolution

Satpati

Reddy

2011

International Journal of Electrochemistry

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Dissolution characteristics of copper in hydrochloric acid medium and the effect of 4-amino 1,2,4-triazole (ATA) on the corrosion process have been studied using conventional electrochemical techniques and rotating ring-disc electrodes (RRDEs). Corrosion potential (E corr ) and corrosion current density (I corr ) were obtained by Tafel extrapolation methods. Charge transfer resistance (R ct ) and double-layer capacitance (C dl ) were obtained from the electrochemical impedance spectroscopy (EIS). ATA was shown to be an effective inhibitor for the copper-corrosion inhibition in acid medium. The corrosion rate was retarded in presence of inhibitors mainly because of the adsorption of the inhibitor on the electrode surface. Adsorption of the inhibitor on the metal surface was found to follow the Langmuir adsorption isotherm. Standard free energy change of the adsorption process (ΔG 0 ad ) was calculated to be −54.3 kJ mol −1 ; such a large negative value of ΔG 0 ad suggests the prescence of a chemisorption process.

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Section: Rotating Ring-disc Electrode Studysupporting

confidence: 92%

Electrochemical Study on Corrosion Inhibition of Copper in Hydrochloric Acid Medium and the Rotating Ring-Disc Voltammetry for Studying the Dissolution

Satpati

Reddy

2011

International Journal of Electrochemistry

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“…As shown in the table, the value of standard free energy of adsorption for J. Curcas leaves extract in H 2 SO 4 is negative, indicating that the adsorption process was spontaneous and stable. 32,37,38) The result also shows that adsorption of the inhibitor on the surface of the mild steel is exothermic.…”

Section: )mentioning

confidence: 93%

Corrosion Inhibition of Mild Steel in Acidic Medium by Jathropha Curcas Leaves Extract

Odusote¹,

Ajayi²

2013

Journal of Electrochemical Science and Technology

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:Inhibition of corrosion of mild steel in sulphuric acid by acidic extract of Jatropha Curcas leaves has been studied using weight loss and thermometric measurements. It was found that the leaves extract act as a good corrosion inhibitor for mild steel in all concentrations of the extract. The inhibition action depends on the concentration of the Jatropha Curcas leaves extract in the acid solution. Results for weight loss and thermometric measurements indicate that inhibition efficiency increase with increasing inhibitor concentration. The adsorption of Jatropha curcas leaves extract on the surface of the mild steel specimens obeys Langmuir adsorption isotherm. Based on the results, Jatropha curcas leaves extract is recommended for use in industries as a replacement for toxic chemical inhibitors.

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“…Generally, the absolute value of ∆G 0 ads is -20 kJ/mol lower than -20 kJ/mol, they are consistent with the electrostatic interaction between the charged molecules and the charged metal called physical adsorption (physisorption); when those that are -40 kJ/mol or more negative than -40 kJ/mol, which involve sharing or transfer of electrons from the inhibitor molecules to the metal surface to form a coordinate bond called chemical adsorption (chemisorption) [50][51][52] . Here, the calculated value of ∆G 0 ads for hexadecylamine from table are found to be ranged from -25.40 to -26.08 kJ mol -1 for different immersion time which indicate that the adsorption process of inhibitor on metal surface is mixed physical and chemical adsorption called physiochemical adsorption [53][54][55] . Also the negative values of ∆G 0 ads revealed that the adsorption of inhibitor on to the mild steel is a spontaneous process usually shows the strong interaction on the surface.…”

Section: Figures 3(a-c) Langmuir Adsorption Isothermmentioning

confidence: 99%

Corrosion Inhibition for Mild Steel in Acidic Medium by Using Hexadecylamine as Corrosion Inhibitor

2017

Chem Sci Trans

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Abstract:The corrosion study of mild steel in 1.0 M HCl solution at 298, 308 and 318 K using various concentrations of hexadecylamine as corrosion inhibitor for different immersion time were carried out by weight loss technique and other different techniques i.e. Potentiodynamic polarization, Electrochemical impedance spectroscopy (EIS) at 298 K and SEM techniques. The adsorption of this molecule leads to the formation of a protective layer on mild steel. From the weight loss measurement the maximum percentage corrosion inhibition efficiency 96.26% was observed for 1000 ppm concentration of inhibitor at 298 K. By electrochemical impedance study it observed that charge transfer resistance (R ct ) value increases and double layer capacitance (C dl ) value decreases with increasing the inhibitior concentration hence inhibition efficiency increases which related to the charge transfer resistance. From potentiodynamic polarization study it was observed that hexadecylamine behave as mixed type corrosion inhibitor. Adsorption of inhibitor on the mild steel surface is in agreement with the Langmuir adsorption isotherm. From the surface study it can be seen that on increasing the inhibitor concentration there is formation of protective layer on the surface of mild steel to protect the surface against corrosion and surface become smooth and more clean and clear. All above techniques study shows that hexadecylamine is a good corrosion inhibitor for mild steel in 1.0 M HCl solution.

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Corrosion inhibition of copper in chloride solutions by pyrazole

Cited by 104 publications

References 29 publications

Electrochemical Study on Corrosion Inhibition of Copper in Hydrochloric Acid Medium and the Rotating Ring-Disc Voltammetry for Studying the Dissolution

Electrochemical Study on Corrosion Inhibition of Copper in Hydrochloric Acid Medium and the Rotating Ring-Disc Voltammetry for Studying the Dissolution

Corrosion Inhibition of Mild Steel in Acidic Medium by Jathropha Curcas Leaves Extract

Corrosion Inhibition for Mild Steel in Acidic Medium by Using Hexadecylamine as Corrosion Inhibitor

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