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Article
Publication date: 1 December 2000

D. Jayaperumal, S. Muralidharan, G. Venkatachari and N.S. Rengaswamy

Acidization is one of the most important techniques to increase the productivity of crude petroleum oil and gas wells. The effective way for protecting these oil well tubular…

418

Abstract

Acidization is one of the most important techniques to increase the productivity of crude petroleum oil and gas wells. The effective way for protecting these oil well tubular materials is by using corrosion inhibitors during the acidization process. The present study deals with the evaluation of inhibition effect of ethanolamines on oil well tubular materials of grade N‐80 steel in 15 per cent hydrochloric acid at room temperature with 0‐2 per cent amine concentrations. The amines such as mono, di and triethanolamine were studied for their inhibiting capacity by mass loss method, DC polarization method and AC Impedance method. The inhibitor efficiency increases with increasing concentration of amines. Monoethanolamine is found to be more effective than the other two amines.

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Anti-Corrosion Methods and Materials, vol. 47 no. 6
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 August 1997

D. Jayaperumal, S. Muralidharan, P. Subramanian, G. Venkatachari and S. Senthilvel

The inhibition effect of propargyl alcohol on the acidic corrosion of mild steel in 5 per cent commercial hydrochloric acid was studied at different temperatures by mass loss…

555

Abstract

The inhibition effect of propargyl alcohol on the acidic corrosion of mild steel in 5 per cent commercial hydrochloric acid was studied at different temperatures by mass loss measurements and polarization studies. Corrosion potential and corrosion current have been calculated in the presence and in the absence of inhibitor. The inhibitor efficiency increases with increase in concentration and it decreases with rise in temperature. The interrelationship between the surface coverage and concentration of the inhibitor was also studied. It has been found that the inhibitor obeys Temkin adsorption isotherm.

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Anti-Corrosion Methods and Materials, vol. 44 no. 4
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 June 1998

C. Jeyaprabha, S. Muralidharan, D. Jayaperumal, G. Venkatachari and N.S. Rengaswamy

To reduce the corrosion of oil‐ and gas‐well equipment during acid treatment, the acid must be inhibited. The behaviour of N‐80 oilfield material in 15 per cent hydrochloric acid…

374

Abstract

To reduce the corrosion of oil‐ and gas‐well equipment during acid treatment, the acid must be inhibited. The behaviour of N‐80 oilfield material in 15 per cent hydrochloric acid solution inhibited by different inhibitor formulations containing amine, ester and a quaternary ammonium compound was studied at 303K for five hours by the mass loss method. The corrosion rates were obtained by polarisation. Impedance studies were carried out to evaluate the performance of the inhibitor formulations. It was found that the formulation containing 3,000ppm amine, 1,000ppm ester and 1,000ppm quaternary ammonium compound was effective for the specific oil‐well tubular material.

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Anti-Corrosion Methods and Materials, vol. 45 no. 3
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 June 1996

D. Mukherjee, S. Muralidharan, G.T. Parthiban, D. Jayaperumal, S.P. Manoharan and K. Balakrishnan

Sensitization of stainless steels has been posing serious problems to the industries. Techniques for rapid detection of sensitized surfaces are being probed throughout the world…

72

Abstract

Sensitization of stainless steels has been posing serious problems to the industries. Techniques for rapid detection of sensitized surfaces are being probed throughout the world. Characterization over a wide behavioural range is essential for the above. Characterizes sensitized surfaces of AISI 304 stainless steel using impedance and tafel‐extrapolation techniques. Welded 304 stainless steel interfaces were subjected to dissolution tests, in different media, for assessing the effect of prolonged post‐stress relieving on the mitigation of surface dissolution. The corrosion rate values were correlated with the period of sensitization and Huey test results. The sensitized stainless steels were also subjected to electrochemical tests in different solutions. From the impedance behaviour of the sensitized surfaces in 3 per cent NaCl electrolyte, it was observed that the rate of fall in the polarization resistance may be used to monitor the extent of sensitization in 304 stainless steel, with better accuracy, than that in utilizing the polarization resistance itself.

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Anti-Corrosion Methods and Materials, vol. 43 no. 6
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 October 1997

D. Mukherjee, G.T. Parthiban, S. Muralidharan, D. Jayaperumal and C. Srividyarajagopalan

Three types of alloys have been chosen, and subjected to three different varieties of macro‐strains, e.g. corrosion‐pittings in a high strength low‐alloy, sensitization‐induced…

291

Abstract

Three types of alloys have been chosen, and subjected to three different varieties of macro‐strains, e.g. corrosion‐pittings in a high strength low‐alloy, sensitization‐induced precipitation in an unstabilized 304 s.s. and cold‐working stresses in FeNiMoB and FeNiMoBSi metallic glass foils for diagnostic studies in corrosion console. Attempts to correlate the galvanic activity of these substrates with the imposed galvanic micro‐strains using an entirely new type of criterion, namely the distance between the forward and backward‐scan, indicated by “d” value in terms of current at a particular chosen potential. This technique, however, is limited by a threshold extent of surface‐strains, in terms of either anodic or cathodic stress concentration‐points above which the surface either develops an anodically activated film or it starts behaving as an effective cathode. The galvanic interactions of the surface, under such conditions, become minimal so that the “d” values no longer remain an increasing function of the increasing surface galvanic strain.

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Anti-Corrosion Methods and Materials, vol. 44 no. 5
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 April 1998

D. Mukherjee

This paper discusses the lower concentration reinforcement of cathodic ultrafine ceramic particulates, on metal matrices like Zn, Al and alloy‐matrices like Cu Zn, Cu Mn, Al Zn…

336

Abstract

This paper discusses the lower concentration reinforcement of cathodic ultrafine ceramic particulates, on metal matrices like Zn, Al and alloy‐matrices like Cu Zn, Cu Mn, Al Zn and Ni‐P‐B alloy‐electrodeposits, etc. It is assumed that these ultrafine ceramic particulates in lower concentration‐range are effective in covering the anodic grain‐boundary networks and other anodic‐defect sites, such that there is an effective reduction of surface anodic‐current. It is shown that at a critical threshold particulate concentration, the surface dissolution is minimum, followed by a drastic increase above that concentration. Such increase in dissolution is attributed to the random dispersion of the particulates on the grain‐proper, as these cannot be accommodated within the anodic grain‐boundary channels, micro‐voids and other defect sites. As such they form stress‐raiser points and enhance surface dissolution. This paper also discusses the correlation of the grain boundary structures, particulate trapping capacity of the matrix and the galvanic stress factors due to random distribution of particulates.

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Anti-Corrosion Methods and Materials, vol. 45 no. 2
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 December 2004

M. Tariq Saeed

The cycloaddition of cyclic nitrone1‐pyrroline‐1‐oxide with 1‐dodecene and 1‐hexadecene afford a bicyclic (isoxazolidines). These isoxazolidines were tested for corrosion…

1346

Abstract

The cycloaddition of cyclic nitrone1‐pyrroline‐1‐oxide with 1‐dodecene and 1‐hexadecene afford a bicyclic (isoxazolidines). These isoxazolidines were tested for corrosion inhibition of carbon steel in 1N H2SO4 in the 30‐60°C temperature range by gravimetric and electrochemical methods. The compound isoxazolidines exhibited excellent inhibition efficiency in the acidic corrosion environment. The presence of heteroatoms such as N and O induce greater adsorption of the inhibitor molecules onto the surface of carbon steel and the long hydrocarbon chains ensure coverage of the metal surface. The values of activation energy and free energy of adsorption indicated the physical nature of the adsorption on the surface of the carbon steel. Thermodynamic parameters were determined for the adsorption process (ΔGadso, ΔHadso, ΔSadso), and kinetic parameters for the metal dissolution (or hydrogen evolution) reaction in the presence of the isoxazolidines. The adsorption of inhibitors on the metal surface was found to obey the Langmuir adsorption isotherm. The isoxazolidines were found to be mixed‐type inhibitors. The isoxazolidine which had a tetradecyl hydrophobe was found to be a better inhibitor than was the decyl analogue.

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Anti-Corrosion Methods and Materials, vol. 51 no. 6
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 12 March 2018

Samy Shaban, Abd Elaziz Fouda, Mohamed Elmorsi, Tarek Fayed and Omar Azazy

The purpose of this study is to inspect the corrosion inhibition of API N80 steel pipelines in uninhibited solution and inhibited with a synthesized surfactant compound…

252

Abstract

Purpose

The purpose of this study is to inspect the corrosion inhibition of API N80 steel pipelines in uninhibited solution and inhibited with a synthesized surfactant compound [N-(3-(dimethyl octyl ammonio) propyl) palmitamide bromide] (DMDPP), which is prepared through a simple and applicable method.

Design/methodology/approach

Weight loss was inspected at five different temperatures of 25°C, 30°C, 40°C, 50°C and 60°C Potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation were used at room temperature. Density functional theory was used to study the relation between the molecular structure and inhibition theoretically.

Findings

Adsorption of the prepared DMDPP fits the Langmuir isotherm model. The inhibition efficiency of the prepared DMDPP amphipathic inhibitor is directly proportional to temperature increase. Polarization results reveal that the investigated DMDPP amphipathic compound behaves as a mixed-type inhibitor. EIS spectra produced one individual capacitive loop.

Originality/value

The originality is the preparation of cationic surfactants through a simple method, which can be used as corrosion inhibitors in oil production. The synthesized inhibitors were prepared from low-price materials. The work studied the behavior of the synthesized surfactants in inhibiting the corrosion of the steel in an acidic medium. Electrochemical and theoretical studies were presented, besides gravimetric and surface examination.

Details

Anti-Corrosion Methods and Materials, vol. 65 no. 2
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 31 December 2015

B.M. Prasanna, B.M. Praveen, Narayana Hebbar and T.V. Venkatesha

The purpose of this paper is to investigate the inhibition effect of hydralazine hydrochloride as a corrosion inhibitor for mild steel in 1M HCl. The inhibition effect was studied…

143

Abstract

Purpose

The purpose of this paper is to investigate the inhibition effect of hydralazine hydrochloride as a corrosion inhibitor for mild steel in 1M HCl. The inhibition effect was studied at different temperatures, ranging from 303 to 333°K.

Design/methodology/approach

The inhibition efficiency of hydralazine hydrochloride was analyzed using weight loss, Tafel polarization, electrochemical impedance spectroscopy and surface morphology methods. The effect of temperature on the corrosion behavior of mild steel in 1M HCl was studied and discussed using an adsorption isotherm and activation parameters.

Findings

Weight loss, polarization and impedance showed that the inhibition efficiency increases with an increase in the concentration of hydralazine hydrochloride for mild steel in 1M HCl. The inhibitive action may be attributed to the adsorption of the inhibitor molecule on the active sites of the metal surface by the Langmuir adsorption isotherm. Polarization curves indicated that hydralazine hydrochloride acts as a mixed-type inhibitor. Scanning electron microscopy was performed on inhibited and uninhibited mild steel samples to characterize the surface. Thermodynamic parameter indicated that the adsorption of hydralazine hydrochloride is a spontaneous process and the adsorption occurs chemically.

Originality/value

The inhibition effect of hydralazine hydrochloride for mild steel has been investigated at different temperatures, ranging from 303 to 333°K. Hydralazine hydrochloride was a good inhibitor at a higher temperature.

Details

Anti-Corrosion Methods and Materials, vol. 63 no. 1
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 16 April 2018

Karima Dob, Emna Zouaoui and Daoiya Zouied

Electrochemical measurements were used to characterize the inhibiting effectiveness of Curcuma and saffron, considered as green inhibitors in a corrosive environment 3% NaCl on…

141

Abstract

Purpose

Electrochemical measurements were used to characterize the inhibiting effectiveness of Curcuma and saffron, considered as green inhibitors in a corrosive environment 3% NaCl on A106 Gr B carbon steel.

Design/methodology/approach

This study/paper aims to polarization and potentiodynamic impedance spectroscopy techniques were performed on A106 Gr B carbon steel in the 3% NaCl environment only and containing various concentrations of Curcuma and Saffron (0.005, 0.01, 0.02, 0.04, g/L) after 30 min of immersion; these measures were taken at a temperature of (298 ± 1)K. A voltlab PGZ 301 assembled by A 106 Gr B carbon steel working electrode, a platinum counter electrode (CE) and a saturated calomel electrode as the reference electrode were used in the experiment. In this research, potentiodynamic polarization and electrochemical impedance spectroscopy were used.

Findings

The inhibition efficiencies increased with increase in the concentrations of the inhibitor but decreased with rise in temperature. The obtained results show an optimal efficiency with 0.04 g/L which are ordered of 78 and 96 per cent successively for the two inhibitors. Curcuma and saffron acts as a mixed type inhibitor. Adsorption of the inhibitor molecules corresponds to Langmuir adsorption isotherm. Mechanism of inhibition was also investigated by calculating the thermodynamic and activation parameters like (ΔG), (Ea), (ΔHa) and (ΔSa). The inhibitor molecules followed physical adsorption on the surface of carbon steel.

Originality/value

The present trend in research on environmental friendly corrosion inhibitors is concentrating on products of natural origin due principally to non-toxicity and eco-friendliness. Among these natural products are curcuma and saffron.

Details

Anti-Corrosion Methods and Materials, vol. 65 no. 3
Type: Research Article
ISSN: 0003-5599

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