Experimental and theoretical investigation on corrosion inhibition of hexamethylenetetramine [HMT] for mild steel in acidic solution

Aribo, Sunday; Olusegun, Sunday J.; Rodrigues, Gabriel L. S.; Ogunbadejo, A. S.; Igbaroola, B.; Alò, Alessio; Rocha, Willian R.; Mohallem, Nelcy Della Santina; Olubambi, Peter Apata

doi:10.1016/j.jtice.2020.06.011

Cited by 19 publications

(3 citation statements)

References 47 publications

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“…Hexamine was shown to be an excellent corrosion inhibitor for API 5L X65 in 0.1M HCl, with an optimal concentration of 600 ppm required to achieve a corrosion rate of 0.4 mm/year [26], according to Ogunbadejo et al Hexamine was investigated by Aribo et al for its ability to prevent mild steel in 1M HCl from corroding. The findings revealed that the inhibition effectiveness was 86% when the inhibitor concentration was 0.8 g/L [27]. In agreement with the Langmuir isotherm, the findings show that the adsorption was caused by physical reactions.…”

Section: Introductionsupporting

confidence: 79%

Investigation of the corrosion inhibition properties of hexamine (HMTA) for mild steel in NaCl solution

Ebrahim¹,

Ghorbani²

2023

Zaštita materijala

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An effective corrosion inhibitor for steel is Hexamine (HMTA). There have been few studies on its corrosion-inhibiting characteristics, particularly in NaCl solution. The electrochemical characteristics of HMTA performance in NaCl 3.5 wt% solution were examined during this study. Additionally, the properties of the HMTA film on the steel surface was investigated. When tested in NaCl solution, electrochemical results revealed that HMTA is a very efficient corrosion inhibitor for mild steel, with an efficacy of 92% at a concentration of 0.08 M. HMTA exhibited mixed type activity in terms of inhibition, according to the findings. Due to the physical adsorption of HMTA compound, as shown by the XRD results, an organic layer was formed as a strategy for HMTA inhibition. Adsorption of chloride ions as a corrosive factor is reduced by the HMTA films, according to EDS and thermodynamic studies.

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Section: Introductionsupporting

confidence: 79%

Investigation of the corrosion inhibition properties of hexamine (HMTA) for mild steel in NaCl solution

Ebrahim¹,

Ghorbani²

2023

Zaštita materijala

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“…2 compounds contain electronegative functional groups and π-electrons in triple or conjugated double bonds that slow down the corrosion rate [5][6][7].…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

Mild steel corrosion inhibition by synthesized 7-(Ethylthiobenzimidazolyl) Theophylline

Diki

Coulibaly²,

Kassi³

et al. 2021

J. Electrochem. Sci. Eng.

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The corrosion inhibition of mild steel by 7-(ethylthiobenzimidazolyl) theophylline (7-ETBT) in 1 M HCl medium was investigated through weight loss and Tafel polarization techniques within a temperature range of 298 to 318 K. The inhibition efficiency depends on the concentration of 7-ETBT and reaction system temperature. The maximum inhibition efficiency values of 90.73 and 87.06 %, respectively, were estimated using both weight loss and Tafel polarization techniques at 298 K. The results suggest spontaneous and predominant physical adsorption of 7-ETBT on the metal surface which obeys Langmuir isotherm model. Furthermore, Tafel polarization method revealed that 7-ETBT is a mixed-type inhibitor. Potentiodynamic polarization results are in accordance with weight loss data to a good extent.

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“…Potassium thiocyanate is widely used to enhance the protection of iron alloys in acid environments by nitrogen-containing CorIs [14,[27][28][29][30]. Hexamethylenetetramine [31][32][33][34][35][36][37], which by itself weakly slows down the corrosion of iron alloys, is also often used as a component of mixed inhibitors. We hypothesized that mixed inhibitors based on TrzD are capable of forming polymer protective layers on the steel surface, which would provide not only efficient inhibition of the corrosion process of iron alloys in H 3 PO 4 but also prevent the bulk sorption of evolved hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Thin Films of a Complex Polymer Compound for the Inhibition of Iron Alloy Corrosion in a H3PO4 Solution

Avdeev,

Nenasheva,

Luchkin

et al. 2023

Polymers

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The etching of iron alloy items in a H3PO4 solution is used in various human activities (gas and oil production, metalworking, transport, utilities, etc.). The etching of iron alloys is associated with significant material losses due to their corrosion. It has been found that an efficient way to prevent the corrosion of iron alloys in a H3PO4 solution involves the formation of thin complex compound films consisting of the corrosion inhibitor molecules of a triazole derivative (TrzD) on their surface. It has been shown that the protection of iron alloys with a mixture of TrzD + KNCS in a H3PO4 solution is accompanied by the formation of a thin film of coordination polymer compounds thicker than 4 nm consisting of TrzD molecules, Fe2+ cations and NCS−. The layer of the complex compound immediately adjacent to the iron alloy surface is chemisorbed on it. The efficiency of this composition as an inhibitor of iron alloy corrosion and hydrogen bulk sorption by iron alloys is determined by its ability to form a coordination polymer compound layer, as experimentally confirmed by electrochemical, AFM and XPS data. The efficiency values of inhibitor compositions 5 mM TrzD + 0.5 mM KNCS and 5 mM TrzD + 0.5 mM KNCS + 200 mM C6H12N4 at a temperature of 20 ± 1 °C are 97% and 98%, respectively. The kinetic parameters of the limiting processes of hydrogen evolution and permeation into an iron alloy in a H3PO4 solution were determined. A significant decrease in both the reaction rate of hydrogen evolution and the rate of hydrogen permeation into the iron alloy by the TrzD and its mixtures in question was noted. The inhibitor compositions 5 mM TrzD + 0.5 mM KNCS and 5 mM TrzD + 0.5 mM KNCS + 200 mM C6H12N4 decreased the total hydrogen concentration in the iron alloy up to 9.3- and 11-fold, respectively. The preservation of the iron alloy plasticity in the corrosive environment containing the inhibitor under study was determined by a decrease in the hydrogen content in the alloy bulk.

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Experimental and theoretical investigation on corrosion inhibition of hexamethylenetetramine [HMT] for mild steel in acidic solution

Cited by 19 publications

References 47 publications

Investigation of the corrosion inhibition properties of hexamine (HMTA) for mild steel in NaCl solution

Investigation of the corrosion inhibition properties of hexamine (HMTA) for mild steel in NaCl solution

Mild steel corrosion inhibition by synthesized 7-(Ethylthiobenzimidazolyl) Theophylline

Thin Films of a Complex Polymer Compound for the Inhibition of Iron Alloy Corrosion in a H3PO4 Solution

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