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Article
Publication date: 1 August 1976

S. Siddagangappa, S.M. Mayanna and F. Pushpanadan

Corrosion rates of copper in 1N sulphuric acid with various concentrations (10−8 to 10−4 M) of 2, 4‐dinitrophenylhydrazine (2, 4‐DNP) are determined by weight loss method. The…

36

Abstract

Corrosion rates of copper in 1N sulphuric acid with various concentrations (10−8 to 10−4 M) of 2, 4‐dinitrophenylhydrazine (2, 4‐DNP) are determined by weight loss method. The corrosion rates (under diffusion control), are a function of the stirring rate and the concentration of 2, 4‐DNP. The corrosion rate decreased markedly on increasing the concentration of 2, 4‐DNP. The maximum corrosion inhibition (85%) is observed at 10−4 M 2, 4‐DNP. The anodic polarization data and the drift in corrosion potential with time towards the less noble direction reveal the inhibition of cathodic reaction of the corrosion process by 2, 4‐DNP. A mechanism is proposed to explain the inhibitor action of 2, 4‐DNP on copper during corrosion in 1N sulphuric acid.

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Anti-Corrosion Methods and Materials, vol. 23 no. 8
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 January 1994

S. Abd El Wanees

Corrosion inhibitors are widely used in industry, although in many cases their surface chemistry is not well understood. Several nitrogen‐containing organic compounds have been…

80

Abstract

Corrosion inhibitors are widely used in industry, although in many cases their surface chemistry is not well understood. Several nitrogen‐containing organic compounds have been used as corrosion inhibitors. Corrosion inhibition is a surface process which involves the specific adsorption of inhibitors on the metal surface. The extent of inhibition of metallic corrosion may depend on the nature of the metal surface and extent of adsorption of the inhibitor. The type of interaction of the inhibitor on the metal surface during corrosion has been deduced from its adsorption characteristics.

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Anti-Corrosion Methods and Materials, vol. 41 no. 1
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 April 2005

A.S. Fouda, A. Abd El‐Aal and A.B. Kandil

To show the effect of organic compounds containing O and N atoms on the corrosion inhibition of Cu in HNO3 and; the effect of some donating substituent groups on the corrosion…

407

Abstract

Purpose

To show the effect of organic compounds containing O and N atoms on the corrosion inhibition of Cu in HNO3 and; the effect of some donating substituent groups on the corrosion inhibition.

Design/methodology/approach

A range of published papers (1956‐1995), which aim to discuss the effect of organic compounds on the corrosion inhibition process. Two methods were used to determine the rate of corrosion, these methods were weight loss and polarisation. The effect of temperature and concentration were studied. The thermodynamic parameters for the process were computed and discussed.

Findings

Provides information about weight loss and polarisation methods and how to prepare the Cu samples before and after tests. This will provide many academics relevant information before teaching or researching duties.

Research limitation/implications

The paper may be using withdrawing substituting groups in addition to donating groups, this will improve the discussion, also the paper does not use the technique of impedance spectroscopy for comparison.

Practical implications

To use Cu alloy for comparison and to use other compounds with larger molecular weights.

Originality value

The use of some phthalimide derivatives as corrosion inhibitors for Cu in HNO3, provide more information on Cu corrosion for academic researchers and provide practical help for starting researchers.

Details

Anti-Corrosion Methods and Materials, vol. 52 no. 2
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 August 2000

C.L. Aravinda, L. Ramesh, S.M. Mayanna and V.S. Muralidharan

Cyclic voltametric studies were carried out on mixtures of nickel sulphate, ferrous ammonium sulphate containing ethylene diamine tetra acetic acid, triammonium citrate, boric…

668

Abstract

Cyclic voltametric studies were carried out on mixtures of nickel sulphate, ferrous ammonium sulphate containing ethylene diamine tetra acetic acid, triammonium citrate, boric acid, Sodium chloride in the pH range of 8.5‐10.5 on platinum. The deposition of iron was found to involve the formation of FeOH+ and the second electron transfer is slow. The formation of iron nickel alloy film is anomalous. The charge transfer rates of FeOH+ and NiOH+ determine the deposition. Stripping voltametric curves revealed the dissolution of iron from an intermediate phase rich of iron in the iron‐nickel films.

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Anti-Corrosion Methods and Materials, vol. 47 no. 4
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 March 1992

Y.A. Elewady, M.M. El‐Tagoury, G.E. Bekheit and S.M. Hassan

The effect of some pyrazoline derivatives as inhibitors on the dissolution of A1 in 2 mol.L−1 HC1 has been studied by weight‐loss, galvanostatic polarization, polarographic and…

12

Abstract

The effect of some pyrazoline derivatives as inhibitors on the dissolution of A1 in 2 mol.L−1 HC1 has been studied by weight‐loss, galvanostatic polarization, polarographic and scanning electron microscopy methods. Additions of Cu2+ Co2+ or Ni2+ ions increases the efficiency of the inhibitors.

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Anti-Corrosion Methods and Materials, vol. 39 no. 3
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 27 June 2008

A. Yurt and Y. Mihrican

The purpose of this paper is to investigate the inhibition effect of 2‐aminoethane thiol hydrochloride, 2‐cystamine dihydrochloride, 2,3‐dimercapto‐1‐propanol, 1,2‐ethanedithiol…

497

Abstract

Purpose

The purpose of this paper is to investigate the inhibition effect of 2‐aminoethane thiol hydrochloride, 2‐cystamine dihydrochloride, 2,3‐dimercapto‐1‐propanol, 1,2‐ethanedithiol, and the synergistic effect of these compounds with halide ions (Cl, Br, I) and with some metal cations (Co2 + , Ni2 + , Cu2 + , Zn2 + ).

Design/methodology/approach

The inhibiting effect of the studied thiols on the corrosion of carbon steel in 0.5 M H2SO4 solution were investigated using potentiodynamic polarisation, electrochemical impedance spectroscopy and linear polarisation methods.

Findings

The inhibition action of thiols depends mainly on the type of the heteroatom present in the inhibitor molecule. The increase in inhibition efficiencies with increase in inhibitor concentration revealed that the studied compounds were adsorbed onto steel surfaces and the adsorption mechanism obeyed the Langmuir adsorption isotherm. Polarisation curves indicated that thiols containing both N and S atoms in their structure behaved as mixed type inhibitors, while thiols containing only an S atom in their structure acted essentially as anodic inhibitors. The increase in the inhibition efficiencies of thiols with the addition of halide ions indicates that halides play important role in the adsorption process. The synergistic effect of the studied metal cations could be explained by the adsorption of complex ions formed from thiol molecules and metal cations.

Originality/value

This paper provides useful information about the relationship between inhibition efficiencies and the structures of thiols and clarifies the mechanism of the synergistic effects of some halides and some metal cations.

Details

Anti-Corrosion Methods and Materials, vol. 55 no. 4
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 February 1990

S.M. Hassan, M.N. Moussa, M.M. El‐Tagoury and A.A. Radi

The inhibition of aluminium corrosion in solutions of hydrochloric acid or sodium hydroxide has been studied using weight‐loss and hydrogen evolution methods. Benzoic acid and its…

95

Abstract

The inhibition of aluminium corrosion in solutions of hydrochloric acid or sodium hydroxide has been studied using weight‐loss and hydrogen evolution methods. Benzoic acid and its derivatives inhibit acidic and alkaline corrosion effectively. The efficiency of inhibitors increases in the order: benzamide < benzaldehyde < acetophenone < benzoic acid < benzophenone (100%). The inhibition efficiency of acid anhydrides follows the sequence: pyromellitic > naphthalic > trimellitic. Inhibition takes place through adsorption by a one‐step process with greater efficiency in alkaline than in acidic methanolic solutions.

Details

Anti-Corrosion Methods and Materials, vol. 37 no. 2
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 August 1988

Awad I. Ahmed, S.N. Basahel and R.M. Khalil Chemistry

The inhibitive effect of some morpholine and thiosemicarbazide derivatives on the dissolution of aluminium in 2M HCI has been investigated by using thermometric, weight loss and…

59

Abstract

The inhibitive effect of some morpholine and thiosemicarbazide derivatives on the dissolution of aluminium in 2M HCI has been investigated by using thermometric, weight loss and hydrogen evolution techniques. The effect of the inhibitors on the protection efficiency and the corrosion rate were determined at various inhibitor concentrations and temperatures. It was observed that the percentage inhibition of aluminium increases with the increase of inhibitor concentration and decreases with rise of reaction temperature. Retardation of dissolution is due to weak adsorption of the additives on the metal surface. The order of inhibition efficiency of the inhibitors used depends on the number of adsorption sites in the molecule, their charge density and molecular size.

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Anti-Corrosion Methods and Materials, vol. 35 no. 8
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 August 1989

A.S. Fouda, S.S Elkaabi and A.K. Mohamed

The inhibitive effect of some substituted phenyl n‐phenylcarbamates on corrosion of iron in 2N HCI have been studied using gaivanostatic polarization measurement. Studies carried…

26

Abstract

The inhibitive effect of some substituted phenyl n‐phenylcarbamates on corrosion of iron in 2N HCI have been studied using gaivanostatic polarization measurement. Studies carried out with different concentrations of the inhibitor indicated that the compounds act as a mixed inhibitor. The results indicate that the additives reduce the corrosion rate by way of adsorption through the oxygen atom of phenoxy group and nitrogen atom of NH group. The inhibitory character of the compounds depends upon the concentration of the inhibitor, as well as its chemical composition. The results of electrocapillary measurements are consistent with the electrochemical measurements. Thermodynamic parameters for absorption of inhibitors have been calculated and discussed.

Details

Anti-Corrosion Methods and Materials, vol. 36 no. 8
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 7 November 2008

A.S. Fouda, Y.A. El‐Ewady, O.M. Abo‐El‐Enien and F.A. Agizah

The purpose of this paper is to show the effect of cinnamoylmalononitrile (CMN) compounds on the corrosion inhibition of carbon steel in HCl and the effect of some substituent…

374

Abstract

Purpose

The purpose of this paper is to show the effect of cinnamoylmalononitrile (CMN) compounds on the corrosion inhibition of carbon steel in HCl and the effect of some substituent groups on the corrosion inhibition.

Design/methodology/approach

Several papers have been published (1900‐1999), which aimed to investigate and explain the effect of organic compounds on the corrosion inhibition process. Two methods were used to determine the corrosion rate, weight loss and galvanostatic polarization. Additionally, the effects of temperature and concentration of the inhibitors were studied. The thermodynamic parameters for the process were computed and discussed.

Findings

The paper finds that surface analytical techniques such as X‐ray photoelectron spectroscopy and Auger spectroscopy can shed more light, on the mechanism of corrosion inhibition.

Research limitations/implications

The use of donating and withdrawing groups will improve understanding of the mechanisms of corrosion and inhibition. However, the paper does not use the technique of impedance measurement for comparison purposes.

Practical implications

Other steel alloys and compounds with large or small molecular weights can be used for comparison.

Originality/value

The use of CMN compounds as corrosion inhibitors for carbon steel in HCl provides more information on carbon steel corrosion for academic and starting researchers.

Details

Anti-Corrosion Methods and Materials, vol. 55 no. 6
Type: Research Article
ISSN: 0003-5599

Keywords

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