The double layer capacity at the interface between iron and acid solutions with and without organic materials

Murakawa, Takao; Hackerman, Norman

doi:10.1016/0010-938x(64)90040-x

Cited by 76 publications

(29 citation statements)

References 20 publications

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“…Comparing the inhibition efficiencies of the compound in both studied media (3% NaCl and 3% Na 2 SO 4 solutions), it was observed that the imidazoline exhibited a higher efficiency in the 3% NaCl than in the Na 2 SO 4 solutions. It is reported that the surface of iron is found to be positively charged in an inhibitor-free sulphate containing solution [51] and the protonated inhibitor compound species would be less strongly adsorbed onto the metal surface resulting in less inhibition efficiencies [31]. In the presence of halide ions, the surface of the metal is negatively charged (as a result of the specific adsorption of chloride ions) and coulombic attraction between the metal and the imidazoline contributes to the higher inhibition efficiency observed in the NaCl solutions.…”

Section: Mechanism Of Corrosion Inhibitionmentioning

confidence: 99%

Inhibition of CO2 corrosion of N80 carbon steel by carboxylic quaternary imidazoline and halide ions additives

Okafor

Liu

et al. 2009

J Appl Electrochem

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The inhibition of the corrosion of N80 mild steel by 2-undecyl-1-1-ethylamino-1-ethylcarboxyl quaternary imidazoline (CQI) in CO 2 -saturated 3% NaCl and 3% Na 2 SO 4 solutions was studied using electrochemical methods. Inhibition efficiency increased with increase in CQI concentration and synergistically increased in the presence of halide ions. CQI inhibited the corrosion reaction by chemical adsorption on the metal/solution interface in halide free solutions and by a combination of chemical and coulombic attraction in the presence of halide ions. The adsorption characteristics of the inhibitor were approximated by Frumkin isotherm and El-Awady et al. kinetic-thermodynamic model.

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Section: Mechanism Of Corrosion Inhibitionmentioning

confidence: 99%

Inhibition of CO2 corrosion of N80 carbon steel by carboxylic quaternary imidazoline and halide ions additives

Okafor

Liu

et al. 2009

J Appl Electrochem

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“…Heterocyclic nitrogen compounds may also adsorb through electrostatic interactions between the positively charged nitrogen atom and the negatively charged metal surface [37]. It is well known that SO 4 2-ions are strongly adsorbed [38] on the metal surface leaving less space available for organic molecules to adsorb. Molecular structure of organic compound is important in synergistic inhibition [39].…”

Section: Corrosion Inhibition Mechanismmentioning

confidence: 99%

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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“…The PZC of iron in sulphuric acid solutions is about À650 mV vs. SCE [9]. In this condition, the aromatic amines interact through the p-electrons of benzene ring with the positively charged metal surface [26] where as in acidic chloride solutions the amines adsorb through electrostatic interaction between the positively charged anilinium cation and negatively charged metal surface due to specific adsorption of chloride on the metal [27]. The adsorption of the inhibitor molecules can be visualized as predominantly as RNH þ 3 ions lying flat on the electrode surface, with the principal adsorption forces arising from a p-bond orbital as reported by Blomgren and Bockris [28].…”

Section: Corrosion Inhibition By Diphenylaminementioning

confidence: 99%

Investigation of the inhibitive effect of poly(diphenylamine) on corrosion of iron in 0.5M H2SO4 solutions

Jeyaprabha

Sathiyanarayanan

Phani

et al. 2005

Journal of Electroanalytical Chemistry

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The double layer capacity at the interface between iron and acid solutions with and without organic materials

Cited by 76 publications

References 20 publications

Inhibition of CO2 corrosion of N80 carbon steel by carboxylic quaternary imidazoline and halide ions additives

Inhibition of CO2 corrosion of N80 carbon steel by carboxylic quaternary imidazoline and halide ions additives

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

Investigation of the inhibitive effect of poly(diphenylamine) on corrosion of iron in 0.5M H2SO4 solutions

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