Inhibition of Mild Steel Corrosion under Hydrodynamic Conditions

Inhibition of corrosion of nickel-aluminum bronze alloy (NAB) by use of 4-amino-5-phenyl-4H-1,2,4-triazole-3-thiol (APTT) was investigated by monitoring weight loss and open-circuit potentials (OCP), and by use of electrochemical impedance spectroscopy (EIS). Quantum chemical data were calculated by use of the density functional theory (DFT) model. Results showed that APTT inhibits corrosion of NAB alloy fairly well. The efficiency of inhibition increases with increasing concentration of APTT, and adsorption of the inhibitor obeys the Langmuir adsorption isotherm model. Negative values of adsorption free energy indicate chemical adsorption is spontaneous. The theoretical study showed that sulfur and nitrogen atoms (S, N7 and N8) were the reactive sites.

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“…and is depicted in Table 1 [27]. The results show that s values increased with inhibitor concentration.…”

Section: Open-circuit Potentials (Ocp)mentioning

confidence: 77%

The role of 4-amino-5-phenyl-4H-1,2,4-triazole-3-thiol in the inhibition of nickel–aluminum bronze alloy corrosion: electrochemical and DFT studies

et al. 2011

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“…The calculated value of DG ads was found to be negative with value around -40 kJ mol -1 , indicating that the adsorption mechanism of inhibitor on mild steel surface occurred spontaneously and chemically [8].…”

Section: Adsorption Isotherm Modelmentioning

confidence: 91%

Electrochemical and quantum chemical studies on phthalhydrazide as corrosion inhibitor for mild steel in 1 M HCl solution

et al. 2011

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The inhibition ability of phthalhydrazide (PTD) for mild steel in 1 M HCl at 30°C was investigated by electrochemical measurements [impedance spectroscopy (EIS) and potentiodynamic polarization techniques] and quantum chemical calculations. The frontier molecular orbital energy E HOMO (highest occupied molecular orbital), E LUMO (lowest unoccupied molecular orbital), and the Mulliken charge distribution were calculated and are discussed. Results showed that the inhibition efficiency of PTD increased with inhibitor concentration. The maximum corrosion inhibition efficiency was 77.6% at 2 mM PTD. Adsorption of the inhibitor followed the Langmuir adsorption isotherm. Adsorption of inhibitor molecules on mild steel surface occurred spontaneously and chemically. Quantum chemical calculations showed that the low performance of PTD as a corrosion inhibitor is due to the large energy gap (E HOMO -E LUMO ).

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“…Each test was carried out in duplicate and the average value was taken. The data are expressed as mass loss per unit time per unit area; in the present work the units of corrosion rate were g/m 2 .day (gmd). The chemical compositions of Cu-Ni alloy were (0.148 %Sn, 0.2%Fe, 0.134%Zn, 0.015%Al, 0.0003%P, 0.5%Sb, 0.0583%Pb, 0.0202%Si, 0.017%S, 0.0056%As, 10%Ni, and the balance is Cu).…”

Section: Experimental Workmentioning

confidence: 99%

“…In fact, the corrosion of metallic materials in acidic solution causes considerable costs [1]. One of the most practical methods for protection against corrosion in acidic media is use of inhibitors [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Most of the efficient organic inhibitors are the compounds which contain hetero-atoms such as oxygen, nitrogen, sulfur, and phosphorus which allowed adsorption on the metal surface [17]Various corrosion inhibitors were suggested for copper inhibition in acidic solutions, but not all of them can be used for a long time [18,19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature on Corrosion Inhibition of Copper - Nickel Alloy by Tetraethylenepentamine Under Flow Conditions

Khadom¹

2014

J. Chil. Chem. Soc.

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The corrosion of copper -nickel alloy in hydrochloric acid was investigated at different temperatures, inhibitor concentrations, and corrosive solution rotation rates. Weight loss technique was used to evaluate the corrosion rate data. Tetraethylenepentamine was used as organic corrosion inhibitor, while hydrochloric acid was the corrosive solution. Different parameters, such as inhibitor efficiency, activation energy were obtained. Corrosion rate increased with both temperature and acid rotation rate, while it decreased with increases of Tetraethylenepentamine concentration. Maximum inhibitor efficiency was at lower level of temperature, acid rotation rate and higher level of inhibitor concentration.

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Inhibition of Mild Steel Corrosion under Hydrodynamic Conditions

Cited by 32 publications

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The role of 4-amino-5-phenyl-4H-1,2,4-triazole-3-thiol in the inhibition of nickel–aluminum bronze alloy corrosion: electrochemical and DFT studies

The role of 4-amino-5-phenyl-4H-1,2,4-triazole-3-thiol in the inhibition of nickel–aluminum bronze alloy corrosion: electrochemical and DFT studies

Electrochemical and quantum chemical studies on phthalhydrazide as corrosion inhibitor for mild steel in 1 M HCl solution

Effect of Temperature on Corrosion Inhibition of Copper - Nickel Alloy by Tetraethylenepentamine Under Flow Conditions

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