Electrochemical and analytical study of corrosion inhibition on carbon steel in HCl medium by 1,12-bis(1,2,4-triazolyl)dodecane

Chikh, Z. Ait; Chebabe, Driss; Dermaj, A.; Hajjaji, Najat; Srhiri, A.; Montemor, M.F.; Ferreira, M.G.S.; Bastos, A.C.

doi:10.1016/j.corsci.2004.05.028

Cited by 78 publications

(23 citation statements)

References 8 publications

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“…The type of adsorption in the initial region was found to obey the Temkin adsorption isotherm, which characterizes the chemisorption of uncharged molecules on a heterogeneous surface. Figure 7 shows the plot of h vs. log C to be linear, which is in agreement with the Temkin equation [30]: …”

Section: Adsorption Considerationssupporting

confidence: 66%

“…4a) led to a negative shift of E corr and slightly increased the anodic and cathodic reaction rates at low overpotentials. This may be related to permeability of the AA film which permits oxygen diffusion from the bulk solution to the electrode surface [30]. This effect becomes unimportant at higher AA concentrations, where the interaction between the inhibitor and the steel electrode was not significantly affected by the presence of oxygen (Fig.…”

Section: Polarization Measurementsmentioning

confidence: 98%

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Effect of ascorbic acid on mild steel dissolution in sulphuric acid solution investigated by electrochemical polarization and surface probe techniques

Oguzie

Wang

2007

J Appl Electrochem

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The effect of ascorbic acid (AA) on the corrosion of mild steel in sulphuric acid solution has been investigated by open circuit potential (OCP) and polarization measurements. AA was observed to shift the OCP to more positive potentials with increasing concentration. The polarization curves revealed that AA inhibited the anodic metal dissolution reaction, although this effect became negligible at high anodic overpotentials. The trend of inhibition efficiency with concentration showed that efficiency increased rapidly at low concentrations, remained almost steady at intermediate concentrations and increased again at high concentrations. The mechanism of inhibition was considered in terms of initial chemisorption of AA according to the Temkin isotherm, followed by formation of chelate compounds with Fe 2+ ions at high concentrations. EDS and AFM analyses of the electrode surface support the proposed inhibition mechanisms.

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Section: Adsorption Considerationssupporting

confidence: 66%

Section: Polarization Measurementsmentioning

confidence: 98%

Effect of ascorbic acid on mild steel dissolution in sulphuric acid solution investigated by electrochemical polarization and surface probe techniques

Oguzie

Wang

2007

J Appl Electrochem

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“…[14] Other anticorrosive inhibitors studied in hydrochloric acid are as follows: polyvinyl alcohol, [15] ascorbic acid, [16] cyclic hydroxylamine, [17] N-propylaminolaurilamida and its derivates, [18] bipyrazole derivates, [19] sodium N,N-diethyl dithiocarbamate, [20] bis(2-hydroxy-1-naphthaldehyde)-1,6-hexadiamine, [21] 4-hydroxy-3-methoxy benzaldehyde (vanillin), [22] 2-aminobenzimidazole, [23] 2-(2-pyridyl)benzimidazole, [24] 4-salicylidenamino-3-phenyl-5-mercapto-1,2,4 triazole, [25] N,N-bis(dodecyldimethyl)-3-oxa-1,5-pentanediammonium dichloride. [26] The inhibition efficiency of organic compounds is strongly dependent on the structure and chemical properties of the layer formed on the metal surface under particular experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Kinetics corrosion process of carbon steel in hydrochloric acid in absence and presence of 2‐(cyclohexylaminomercapto) benzothiazole

Samide

Bibicu

2008

Surface & Interface Analysis

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The corrosion and inhibition behavior of carbon steel in 1 M HCl in the presence of 2-(cyclohexylaminomercapto) benzothiazole (CMB) was investigated using weight-loss measurements, galvanostatic polarization studies and UV-VIS spectrophotometry. The morphology of a surface was analyzed by using Mössbauer spectroscopy. Some samples were examined by scanning electron microscopy. The inhibition efficiency increased with increasing CMB concentration and decreased with increasing temperature of the corrosion medium. The activation energy (E a ) was determined from Arrhenius equation. The activation enthalpy ( H 0 ) and the activation entropy ( S 0 ) were calculated from the diagram of the transition state. The experimental results suggest that the presence of CMB in the solution increases the surface coverage (θ ) and therefore, indicates the adsorption of CMB. The adsorption of this compound on the metal surface is found to obey Langmuir's adsorption isotherm. The UV-VIS spectrophotometry shows a decrease of the concentration of CMB in HCl solution after corrosion, indicating that an adsorption process occurs between an organic compound from aqueous phase and the electrode surface. From the Mössbauerspectroscopy studied at this stage, it is expected that the main product of corrosion is a nonstoichiometric amorphous Fe 3+ oxyhydroxide, consisting of a mixture of α, β and γ -FeOOH, where γ -FeOOH is the main phase.

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“…The carbon steel surface is positively charged in hydrochloric acid solutions at the open corrosion potential, but becomes negatively charged when chloride ions are present. The adsorption of some filmic inhibitors can be obtained by the synergistic effect between chlorides anions and positive ions present in the inhibitor molecule [4]. In this example, the inhibitor acts by stopping hydrogen evolution reactions and decreasing cathodic currents.…”

Section: Introductionmentioning

confidence: 99%

Crude unit overhead corrosion — pH profile and corrosion rate of carbon steel under controlled condensation

Cypriano

Gomes²,

Jambo

2010

Materials & Corrosion

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For this paper a laboratory simulation of the crude unit overhead corrosion was conducted. The main variable that impacts the corrosion rates for pipes, heat exchangers, and drums that compound the overhead system is pH. To control this pH many companies use different kinds of neutralizers, trying to keep in an optimum range, determined for each unit, according to their own characteristics. For this study an apparatus that simulate the evaporation and subsequent condensation of a solution with hydrochloric acid and other with neutralizer, with five carbon steel coupons analyzed by metal mass-loss was used. To compare to field practices, three kinds of neutralizer solutions were used. It was possible to observe differences between the pH profiles along condensation, which certainly influences the corrosion rate from the first condensed solution until the last one. It can be compared with the process at the atmospheric tower, from the overhead pipe, passing by the condenser until the drum that accumulates sour water at the end. In this last one the pH is usually measured, but it cannot represent what we could observe with this laboratory apparatus, that the first solution condensed is the worst for corrosion, and that there is a direct relationship between them.

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Electrochemical and analytical study of corrosion inhibition on carbon steel in HCl medium by 1,12-bis(1,2,4-triazolyl)dodecane

Cited by 78 publications

References 8 publications

Effect of ascorbic acid on mild steel dissolution in sulphuric acid solution investigated by electrochemical polarization and surface probe techniques

Effect of ascorbic acid on mild steel dissolution in sulphuric acid solution investigated by electrochemical polarization and surface probe techniques

Kinetics corrosion process of carbon steel in hydrochloric acid in absence and presence of 2‐(cyclohexylaminomercapto) benzothiazole

Crude unit overhead corrosion — pH profile and corrosion rate of carbon steel under controlled condensation

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