Experimental and Theoretical Studies of Volatile Corrosion Inhibitors Adsorption on Zinc Electrode

Teixeira, Deiver Alessandro; Valente, Marco A. G.; Benedetti, Assis Vicente; Feliciano, Gustavo Troiano; Silva, Sebastião C. da; Fugivara, Cecilio Sadao

doi:10.5935/0103-5053.20140296

Cited by 4 publications

(4 citation statements)

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“…Despite the presence of corrosion spots, it can be seen (Figures 12C–E ) that the vapors of the caprylate salts provided some protection to the surface in the following order: CDCHA > CCHA > CETA. In a previous study (Teixeira et al, 2015 ), the presence of vapors of CHA, DCHA and ETA amines also modified the zinc surface: DCHA protected the surface and no corrosion was observed; CHA showed partial protection with the presence of corrosion spots; ETA oxidized all the zinc surface (Teixeira et al, 2015 ). The poor performance of CETA is related to the complexes formation with ETA and the free space suggested from theoretical calculations (Figure 8 ) due to the ETA the strong lateral interactions and molecules distribution on the zinc surface.…”

Section: Resultsmentioning

confidence: 90%

“…Many organic molecules containing an amino functional group have been investigated and used as corrosion inhibitors for the zinc surface (Subramanian et al, 1999 ; Rammelt et al, 2009 ; Teixeira et al, 2015 ). The high electron density and the presence of oxygen, sulfur, nitrogen, and π-bonds are the main characteristics of these molecules tested as corrosion inhibitors (Quraishi et al, 2002 ; Vuorinen et al, 2004 ).…”

Section: Introductionmentioning

confidence: 99%

“…The efficiency of VCI tests can be investigated, among others, using the wet chamber (Skinner, 1993 ; Wan et al, 2005 ), electrochemical tests (Rammelt et al, 2009 , 2011 ), and theoretical and computational treatment (Teixeira et al, 2015 ).…”

Section: Introductionmentioning

confidence: 99%

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Caprylate Salts Based on Amines as Volatile Corrosion Inhibitors for Metallic Zinc: Theoretical and Experimental Studies

et al. 2017

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The interaction of volatile corrosion inhibitors (VCI), caprylate salt derivatives from amines, with zinc metallic surfaces is assessed by density functional theory (DFT) computer simulations, electrochemical impedance (EIS) measurements and humid chamber tests. The results obtained by the different methods were compared, and linear correlations were obtained between theoretical and experimental data. The correlations between experimental and theoretical results showed that the molecular size is the determining factor in the inhibition efficiency. The models used and experimental results indicated that dicyclohexylamine caprylate is the most efficient inhibitor.

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Caprylate Salts Based on Amines as Volatile Corrosion Inhibitors for Metallic Zinc: Theoretical and Experimental Studies

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“…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 phenomena on the metal surface 15 and organic molecules containing functional groups showed to be efficient corrosion inhibitors, such as amino group which act as inhibitor on metal surfaces. On the other hand, molecular solubility and degradation aspects also must be taken into account.…”

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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 study of xanthene derivatives as corrosion inhibitor for mild steel in hydrochloric acid solution

et al. 2022

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Experimental and Theoretical Studies of Volatile Corrosion Inhibitors Adsorption on Zinc Electrode

Cited by 4 publications

References 1 publication

Caprylate Salts Based on Amines as Volatile Corrosion Inhibitors for Metallic Zinc: Theoretical and Experimental Studies

Caprylate Salts Based on Amines as Volatile Corrosion Inhibitors for Metallic Zinc: Theoretical and Experimental Studies

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

Experimental and theoretical study of xanthene derivatives as corrosion inhibitor for mild steel in hydrochloric acid solution

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