Experimental and theoretical evaluation of semicarbazones and thiosemicarbazones as organic corrosion inhibitors

Goulart, Carla Marins; Esteves-Souza, Andressa; Martínez‐Huitle, Carlos A.; Rodrigues, Ciro José Ferreira; Maciel, Maria Aparecida Medeiros; Echevarrı́a, Aurea

doi:10.1016/j.corsci.2012.10.029

Cited by 258 publications

(90 citation statements)

References 61 publications

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“…It is clear Nyquist plots describe semi-circular shapes as well as one time constant, which are displayed in the Bode diagram. This refers to the corrosion of carbon steel in deaerated acidic solution is primarily controlled through the process of charge transfer [35,36]. Even though the Nyquist plots remain without change in general style, the diameter of the semi-circular portion of the plot increased following the addition of the corrosion inhibitors in the aggressive media and the resulting enhanced corrosion resistance of the carbon steel electrode.…”

Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

“…As predicted, the addition of corrosion inhibitors to the 0.05 M sulfuric acid reduced the dissolution of free metal in anodic reaction and the cathodic reaction by retarding the hydrogen evolution reaction. This occurs consequently of the adsorption of the drug inhibitors on thecarbon steel electrode which in turn block the active site 36 . The inhibitory action may affect either or both theanodic and cathodic corrosion reactions 37 .…”

Section: Potentiodynamic Polarization Curve Measurementsmentioning

confidence: 99%

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A Study into the Corrosion Inhibition of Carbon Steel in Acidic Medium Using Eco-Friendly Compounds

2017

Irq. Nat. J. Chem.

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The corrosion inhibition effects of cefixima and aminobenzylpenicillin drug inhibitors in 0.05M deaerated sulfuric acid solution for carbon steel have been studied by using electrochemical techniques and quantum chemical calculations as well as scanning electron microscope (SEM). It is observed from the experimental findings that both compounds perform as good inhibitors and behave according to mixed type inhibitor in terms of their inhibitory action. Additionally, it was found the percentage of corrosion inhibition become maximal when the concentrations of the cefixima and aminobenzylpenicillin inhibitors are increased. The influence of temperature on the corrosion of carbon steel has been investigated and the activation energy values estimated. The corrosion efficiency decreases with increasing the temperature range. The parameters of thermodynamic have been determined and indicate that the adsorption mechanism follows the Langmuir isotherm model and forms a protective layer on carbon steel surface electrode, which was characterized by scanning electron microscope measurements, to prevent a corrosion process. Quantum chemical calculations have been performed to provide evidence for corrosion inhibition according to the chemical structures of the cefixima and aminobenzylpenicillin drug inhibitors.

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Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

Section: Potentiodynamic Polarization Curve Measurementsmentioning

confidence: 99%

A Study into the Corrosion Inhibition of Carbon Steel in Acidic Medium Using Eco-Friendly Compounds

2017

Irq. Nat. J. Chem.

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“…The solubility of aluminum oxide film formed on its surface increases beyond the limits of a pH range from 4 to 9 1 . The inhibition of materials corrosion by non-toxic organic inhibitors and heavy metal free is an encouraging solution that can effectively replace the use of chemical inhibitors [2][3][4] . The mechanism action of organic inhibitors is explained by physical and / or chemical adsorption on the metal surface 3,[5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Inhibition of aluminum corrosion in 0.1 M Na2CO3 by Ricinus communis oil

Hamdou¹,

Essahli²,

Lamiri³

2017

Mediterr.J.Chem.,

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The study was carried out using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) technique. The inhibition efficiency was found around 87 % with 1600 ppm of inhibitor. The efficiency was accentuated with the increase of the concentration while it decreased with the rise of the temperature. Analysis of the polarization curves revealed that the Ricinus communis oil is considered as a mixed inhibitor. The Influence of the temperature was also studied, the values of the activation energy showed that the inhibition occurred by physisorption.

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“…The aim of this study is to report the inhibitory ability of the compound 2-(2,3-dihydro- [1,4] oxazino [2,3-b]quinoxalin-4-yl) ethanol (OAQX) against corrosion of AISI 1018 mild steel, in saline conditions. The benzopyrazine OAQX derivative ( Figure 1) was chosen because it is structurally suitable on the referred purpose due to the different Lewis basic sites which could strongly coordinate with metallic materials.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5] Mild steels have been extensively employed in many industrial fields due to their interesting properties, easy fabrication and low cost. 6 However, they are sensitive to corrosion phenomenon, and become an environmental problem.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Analysis of an Oxazinoquinoxaline Derivative for Corrosion Inhibition of Aisi 1018 Steel

et al. 2017

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The inhibitory ability of an oxazinoquinoxaline derivative (OAQX) against the corrosion of AISI 1018 mild steel induced by aqueous 0.6 mol L -1 NaCl solution is herein evaluated. Linear polarization resistance studies showed the inhibitory efficiency of OAQX varying from 62.75% to 75.93% with OAQX concentration ranged from 0.259 x 10 -4 mol L -1 to 3.243 x 10 -4 mol L -1 . Aiming at to investigate the Tafel curves on the OAQX electrochemical behavior at saline (0.6 mol L -1 NaCl) aqueous media the linear Tafel segments of anodic and cathodic curves were extrapolated to the intersection point which afforded corrosion potential (E corr ) and corrosion current density (i corr ) data. By applying Tafel approach the efficiency of OAQX ranges from 55.30% to 87.60%. In both analysis Langmuir isotherm lead to optimized adsorption parameter. The adsorption mechanism of OAQX is proposed from FTIR experiments and quantum calculations. The theoretical employed method is hybrid B3LYP combined with 6-311++G(d,p). Theoretical results showed OAQX as a promising inhibitor that form a stable protective metal-ligand film on metal surfaces, and differs from several heterocyclic compounds due to its solubility in small amount of DMSO (0.627 x 10 -4 mol L -1 ) which is resistant to a saline aqueous media (0.6 mol L -1 NaCl).Keywords: oxazinoquinoxaline derivative; corrosion inhibitor; linear polarization resistance; FTIR analysis; modeling studies. INTRODUÇÃOCorrosion is one of the main problems found in several industrial processes since it leads to material failure and this damage cause several consequences, including pollution, risks of accidents and financial losses. [1][2][3][4][5] Mild steels have been extensively employed in many industrial fields due to their interesting properties, easy fabrication and low cost. 6 However, they are sensitive to corrosion phenomenon, and become an environmental problem. In this sense, it is important to focuses on the demand for fossil fuels from which a major application of mild steels arrives from their use in the petroleum industry. Since the largest oil sources are located underground in oceans and seas, corrosion of these materials by saline conditions has been attracting considerable attention. [7][8][9][10] The addition of a corrosion inhibitor in the corrosive medium is one of the most common approaches to control corrosion process. 11 In this context, since mild steels are basically composed of metallic atoms (iron, manganese, copper, among others) the choice of a corrosion inhibitor especially comes from its electron donation ability or electrostatic interaction. The chemical structure of organic compounds contain elements like oxygen, sulfur, nitrogen as well as π bonds, which shows high electron density. In fact, heterocyclic compounds containing nitrogen, oxygen sulfur, and phosphorous have been extensively reported for their effectiveness in this field. 2,4,[12][13][14][15][16][17][18][19][20][21][22][23][24][25] Such important characteristic contributes to the adsorption phenom...

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Experimental and theoretical evaluation of semicarbazones and thiosemicarbazones as organic corrosion inhibitors

Cited by 258 publications

References 61 publications

A Study into the Corrosion Inhibition of Carbon Steel in Acidic Medium Using Eco-Friendly Compounds

A Study into the Corrosion Inhibition of Carbon Steel in Acidic Medium Using Eco-Friendly Compounds

Inhibition of aluminum corrosion in 0.1 M Na2CO3 by Ricinus communis oil

Experimental and Theoretical Analysis of an Oxazinoquinoxaline Derivative for Corrosion Inhibition of Aisi 1018 Steel

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