Corrosion control of Cu–Ni alloys in neutral chloride solutions by amino acids

Badawy, W. A.; Ismail, Khaled M.; Fathi, Ahlam M.

doi:10.1016/j.electacta.2005.11.037

Cited by 178 publications

(87 citation statements)

References 34 publications

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“…The slopes of the CInh/h versus CInh plots are close to :1.38 in case of nitric acid, whereas :2.53 in the case of NaOH solution which indicates the ideal simulating and expected from Temkin adsorption isotherm [65]. K ads values were calculated from the intercepts of the straight lines on the CInh/h axis [66]. Generally, the relatively high values of the adsorption equilibrium constant (K ads ) as given in Table 4 reflect the high adsorption ability [58,59] of the PSC molecules on the iron surface.…”

Section: Adsorption Isotherm and Thermodynamic Considerationmentioning

confidence: 99%

Inhibitive properties, thermodynamic, kinetics and quantum chemical calculations of polydentate Schiff base compounds as corrosion inhibitors for iron in acidic and alkaline media

Madkour

Elroby²

2015

Int J Ind Chem

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Quantum chemical calculations based on the density functional theory (DFT) method were performed on five polydentate Schiff base compounds (PSCs), act as corrosion inhibitors for iron in aerated 2.0 M HNO 3 and 2.0 M NaOH, aiming to analyze the characteristics of the inhibitor/surface mechanism as well as to analyze the experimental data and to describe the structural nature of the inhibitor on the corrosion process. The relationship between molecular structure of PSC and their inhibition efficiencies was discussed. The inhibition effect has been investigated using weight loss, thermometric, potentiodynamic polarization measurements and quantum chemical study. Among the compounds studied, 4-(2-hydroxynaphthylideneamino) antipyrine (PSC_1) exhibited the best inhibition efficiency IE (%) 78.4 % at 10 -4 M at 303 K. The high IE of (PSCs) was attributed to the blocking of active sites by adsorption of inhibitor molecules on the iron surface. Adsorption of (PSCs) inhibitors is spontaneous, exothermic, obeyed Temkin isotherm and is regarded as physiochemical mechanism. Polarization measurements indicate that all the examined Schiff bases are of mixedtype inhibitor in HNO 3 ; causing only inhibition of the cathode process in NaOH. The results showed that the inhibition efficiency of PSCs increased with the increase in E HOMO and decrease in E LUMO -E HOMO ; and the areas containing N and O atoms are most possible sites for bonding the metal iron surface by donating electrons to the metal.

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Section: Adsorption Isotherm and Thermodynamic Considerationmentioning

confidence: 99%

Inhibitive properties, thermodynamic, kinetics and quantum chemical calculations of polydentate Schiff base compounds as corrosion inhibitors for iron in acidic and alkaline media

Madkour

Elroby²

2015

Int J Ind Chem

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“…All correlation coefficients (r > 0.998) indicated that the inhibition of carbon steel by studied complex surfactants was attributed to the adsorption of inhibitors on the metal surface. However, the slopes of the C inh / θ versus C inh plots were close to 1 and showed a little deviation from unity which meant non-ideal simulating [31] and unexpected from Langmuir adsorption isotherm. They might be the results of the interactions between the adsorbed species on the metal surface [32,33].…”

Section: Weight Loss Measurements and Adsorption Isothermmentioning

confidence: 99%

Some surfactants based on the vegetable oils as CO2 corrosion inhibitors for mild steel in oilfield formation water

Abbasov¹,

Aliyeva²,

El‐Lateef³

et al. 2015

Int. J. Corros. Scale Inhib.

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The new complex surfactants were synthesized based on sunflower oil and its inhibiting action on the corrosion of carbon steel in CO 2 -saturated oilfield formation water was investigated by means of weight loss and linear polarization resistance corrosion rate. The results revealed that the studied surfactants were excellent inhibitors. The percentage inhibition efficiency (IE %) increases by increasing the inhibitor concentration until the critical micelle concentration (CMC) is reached. The strong adsorption ability of the surfactant molecules leads to formation of a mono-layer, which isolates the surface from the environment and thereby reduces the corrosion attack on the surface. The adsorption process was found to obey the Langmuir adsorption isotherm.

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“…There are slight changes in the OCP towards the negative direction at the different concentrations of inhibitor. This behaviour can be attributed to the adsorption -desorption equilibrium process for the inhibitor molecules on the surface of the electrode (Badawy et al, 2006). The extent of this displacement in the values of the OCP indicates that inhibitor molecules instantaneously impact both the cathodic and anodic processes, i.e, the organic compounds can be classified as a cathodic and/or an anodic inhibitor and necessitates to change in the values of OCP with the additive's inhibitor with reference to the blank acidic solution.…”

Section: Potentiodynamic Polarization Curvesmentioning

confidence: 99%

Adsorption Aspects, Inhibitory Properties and a Study of Surface Corrosion of Carbon Steel in Acidic Media

Qhatan¹,

Adel²

2016

MAS

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The impact of cupral compound on steel in presence of deaerated 0.25 M H 2 SO 4 and 0.5M HCl acidic solutions at 298.15K was examined by employing electrochemical measurements. It has been observed that the corrosion efficiency increased by increasing of cupral concentration of the corrosion inhibitor and this enhanced the inhibitory action as mixed type inhibitor. Several different adsorption models were examined which indicate the adsorption of cupral compound as inhibitor on the carbon steel electrode surface follows the Langmuir isotherm equation. The thermodynamic factors governing adsorption, as well as the parameters of kinetics corrosion have been estimated. The role of nanosilica has been observed to reduce the values of current density of corrosion process and this was confirmed by study the surface morphology of electrode via SEM-EDX and AFM techniques by formation a protective layer on carbon steel electrode.

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Corrosion control of Cu–Ni alloys in neutral chloride solutions by amino acids

Cited by 178 publications

References 34 publications

Inhibitive properties, thermodynamic, kinetics and quantum chemical calculations of polydentate Schiff base compounds as corrosion inhibitors for iron in acidic and alkaline media

Inhibitive properties, thermodynamic, kinetics and quantum chemical calculations of polydentate Schiff base compounds as corrosion inhibitors for iron in acidic and alkaline media

Some surfactants based on the vegetable oils as CO2 corrosion inhibitors for mild steel in oilfield formation water

Adsorption Aspects, Inhibitory Properties and a Study of Surface Corrosion of Carbon Steel in Acidic Media

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