The inhibition of mild steel corrosion in 1 M HCL in the presence of linear and cyclic thiocarbamides—Effect of concentration and temperature of the corrosion medium on their protective action

Stoyanova, Antonia; Соколова, Е. И.; Raicheva, S.N.

doi:10.1016/s0010-938x(97)00063-2

Cited by 105 publications

(41 citation statements)

References 11 publications

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“…A plot of  versus log C displays a linear relationship (Figure 8), signifying that the adsorption of BPTU on the low carbon steel surface obeys Temkin's adsorption isotherm. The applicability of Temkin's adsorption isotherm confirms the assumption of a monolayer adsorption on a uniform homogeneous metal surface with an interaction in the adsorption layer (Stoyanova et al, 1997;Pandian & Sethuraman, 2009). The photographs of the low carbon steel sample corroded in a 0.1 M HCl medium at 28°C in the absence and presence of 0.0004 mol/L of BPTU are shown in Figures 9a and 9b.…”

supporting

confidence: 54%

Electrochemical Corrosion of Low Carbon Steel in a Hydrochloric Acid Medium

Shetty¹,

Shetty²

2016

IJTech

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Inhibition is one of the mechanisms used for mitigating the metallic corrosion, particularly in an acid environment. The present work aims to investigate the inhibiting effect of N-benzyl-N / -phenyl thiourea (BPTU) on the corrosion of low carbon steel in a 0.1 M hydrochloric acid (HCl) solution using a Tafel extrapolation and linear polarization techniques. The study reveals that BPTU acts as an excellent anodic inhibitor for low carbon steel in a HCl solution. The protective efficiency of the compound was found to be more than 97% even at higher temperatures. The study demonstrated that BPTU gets adsorbed on the steel surface, following Temkin's adsorption isotherm and the inhibition is controlled by a chemisorption mechanism. The investigation shows that the results obtained from the Tafel extrapolation and linear polarization techniques for the corrosion of mild steel in HCl medium were in good agreement. The influence of temperatures and concentrations of BPTU on the corrosion of low carbon steel are also examined in the present work.

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supporting

confidence: 54%

Electrochemical Corrosion of Low Carbon Steel in a Hydrochloric Acid Medium

Shetty¹,

Shetty²

2016

IJTech

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“…Temkin's adsorption plot for mild steel in the presence of 0.0001-0.0004 mol/L of BPTU and CPTU at different temperatures are shown in Figures 6a, 6b. It can be seen that  has a linear correlation with log C. This signifies that the compounds adsorbed on the steel surface follows Temkin's adsorption isotherm and its applicability verifies the assumption of a single layer adsorption on a uniform homogeneous metal surface (Stoyanova et al, 1997;Shetty et al, 2007). …”

Section: Kinetic Parameters Of Adsorptionmentioning

confidence: 53%

Inhibition of Mild Steel Corrosion in Acid Medium

Shetty¹,

Shetty²

2017

IJTech

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Since inhibition is the simplest mechanism used for mitigating the corrosion of metals and alloys, particularly in acidic environments, the present work aims to investigate the inhibiting effect of N-benzyl-N′-phenyl thiourea (BPTU) and N-cyclohexyl-N′-phenyl thiourea (CPTU) on mild steel corrosion in 0.1M HCl medium using the Tafel extrapolation technique. Tafel experiments were conducted with ±250 mV vs. rest potential (RP) in steps of 20 mV from the cathodic side for recording the corrosion currents, and then, the Tafel plot of potential vs. current was drawn for determining the corrosion current density (icorr). The linear polarization method was also used for validating the Tafel results. It was performed by polarizing the specimen with ±20 mV vs. RP in steps of 5 mV, and the corrosion currents were noted. The plot of potential vs. current was drawn for calculating icorr. The study reveals that both BPTU and CPTU act as anodic inhibitors for mild steel in the HCl medium, and good inhibition efficiency (>97%) was evidenced from both the compounds even at elevated temperatures. The study also reveals that the investigated compounds get adsorbed quickly on the steel surface, following Temkin's adsorption isotherm. The kinetic parameters obtained from the study indicated that the inhibition was governed by a chemisorption mechanism and the presence of inhibitors substantially reduced the metal dissolution in the studied temperature range. The investigation shows that there was a good correlation between the Tafel extrapolation and linear polarization results.

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“…Such a procedure represents a challenge to the application of regular structure-activity chemometric thinking applied in biological fields, since the physical adsorption is nonspecific, in opposition to the key-lock mechanism found in molecular biology. Although under such circunstance we should expect lower statistical correlations than those found on biological studies, early corrosion studies, on the contrary, showed several successful results [4][5][6][7][8][9] correlating small number of inhibitors and quantum descriptors.…”

Section: Introductionmentioning

confidence: 76%

“…The stripping profile of the score plot shows that each family interacts with the duplex steel in a different way, with a major distinction for the aromatic amine molecules. It is also interesting to note that the largest aliphatic amines (1,5,6,9) are slightly apart from the main group, especially the larger ones like tributyl amine (1) and dodecylamine (5). This might be an indication of a different interaction mechanism with amines having large number of carbon atoms.…”

Section: Principal Component Analysis (Pca)mentioning

confidence: 99%

QSPR prediction analysis of corrosion inhibitors in hydrochloric acid on 22%-Cr stainless steel

Cardoso¹,

Hollauer²,

Borges³

et al. 2006

J. Braz. Chem. Soc.

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Inibidores de corrosão são largamente utilizados na prevenção de corrosão em operações de estimulação em poços de petróleo. Investigações teóricas e experimentais detalhadas de vinte e três compostos incluindo aminas, derivados de tiouréia e álcoois acetilênicos foram realizadas para estimar a sua eficiência na inibição de corrosão do aço 22% Cr (de estrutura austenítico-ferrítica; duplex) em soluções de ácido clorídrico (15% m/v). Os dados obtidos foram interpretados teoricamente com respeito à análise de regressão (OLS), análise de componentes principais (PCA), predição e análise de regressão parcial (PLS) empregando descritores quânticos e baseados na contribuição de grupos. Em nosso estudo vemos vantagem no uso da função de adsorção de Langmuir isoestérica em peso (WILA), ln(θM/(1-θ)) or ln(K ads ). Excelentes correlações foram obtidas para a maioria dos modelos e algumas equações, resultados, curvas de calibração e validação estão descritas no texto. O resultado do presente trabalho representa um esforço preliminar no sentido de prover um eficiente método para a estimativa da eficiência da inibição de corrosão, de inibidores arbitrários em vários metais, ligas e tipos de aço.Corrosion inhibitors have been widely used to prevent corrosion on stimulation operations on petroleum wells. Detailed experimental and theoretical investigation of twenty three different compounds including amines, thiourea derivatives, and acetylenic alcohols were carried out to estimate their inhibition corrosion efficiency on 22% Cr stainless steel (austenitic-ferritic, duplex) in hydrochloric acid (15% m/v) solutions. The obtained data were theoretically interpreted with respect to prediction, regression analysis (OLS), principal analysis component (PCA) and partial regression analysis (PLS) employing quantum and group contribution descriptors. In our study we found advantage in the use of the weight isoesteric Langmuir adsorption function (WILA), ln(θM/(1-θ)) or lnK ads . Excellent correlations were obtained for most models and few equations, results, calibration and validation plots were discussed in the text. The content of the present work represents a first step toward an efficient estimation of the inhibition corrosion efficiency (ICE) of arbitrary inhibitors towards several metals, alloys and steel types.

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The inhibition of mild steel corrosion in 1 M HCL in the presence of linear and cyclic thiocarbamides—Effect of concentration and temperature of the corrosion medium on their protective action

Cited by 105 publications

References 11 publications

Electrochemical Corrosion of Low Carbon Steel in a Hydrochloric Acid Medium

Electrochemical Corrosion of Low Carbon Steel in a Hydrochloric Acid Medium

Inhibition of Mild Steel Corrosion in Acid Medium

QSPR prediction analysis of corrosion inhibitors in hydrochloric acid on 22%-Cr stainless steel

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