5-(3-Pryridyl)-4H-1,2,4-triazole-3-thiol as Potential Corrosion Inhibitor for AA6061 Aluminium Alloy in 0.1 M Hydrochloric Acid Solution

Raviprabha, K.; Bhat, Ramesh S.

doi:10.3103/s1068375519060103

“…It is also evident from AT-1 and AT-3 alloy that the addition of inhibitor shifted corrosion potential E corr in an anodic direction, indicating that the inhibitor's adsorption was more successful at anodic than cathodic sites 32 . The observed variation in E corr values has been repeatedly reported [33][34][35] . Specifically, if the E corr displacement is greater than 85 mV, the inhibitor would be classified as a cathodic or anodic type inhibitor.…”

Section: Electrochemical Behavior Of Al and Al-ti Alloys In The Absen...supporting

confidence: 71%

The inhibitive action of 2-mercaptobenzothiazole on the porosity of corrosion film formed on aluminum and aluminum–titanium alloys in hydrochloric acid solution

El-Sayed

¹

,

El‐Hendawy

²

,

El-Mahdy

³

et al. 2023

Sci Rep

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Abstract2-Mercaptobenzothiazole (2-MBT) in a solution of 0.5 M HCl is an effective corrosion inhibitor for aluminum and aluminum–titanium alloys. Tafel polarization and electrochemical impedance spectroscopy (EIS) were employed to assess this heterocyclic compound’s anticorrosive potential and complementary by scanning electron microscope (SEM) and calculating porosity percentage in the absence and presence of various inhibitor concentrations. Inhibition efficiency (IE%) was strongly related to concentration (10–6–10–3 M). Temperature’s effect on corrosion behavior was investigated. The data exhibited that the IE% decreases as the temperature increases. An increase in activation energy (Ea) with increasing the inhibitor concentration and the decrease in the IE% value of the mentioned compound with raising the temperature indicates that the inhibitor molecules are adsorbed physically on the surface. Thermodynamic activation parameters for Al and Al–Ti alloy dissolution in both 0.5 M HCl and the inhibited solution were calculated and discussed. According to Langmuir’s adsorption isotherm, the inhibitor molecules were adsorbed. The evaluated standard values of the enthalpy ($$\Delta {H}_{ads.}^{o})$$ Δ H a d s . o ) , entropy ($$\Delta {S}_{ads.}^{o})$$ Δ S a d s . o ) and free energy changes ($$\Delta {G}_{ads.}^{o})$$ Δ G a d s . o ) showed that $$\Delta {H}_{ads.}^{o}$$ Δ H a d s . o and $$\Delta {G}_{ads.}^{o}$$ Δ G a d s . o are negative, while $$\Delta {S}_{ads.}^{o}$$ Δ S a d s . o was positive. The formation of a protective layer adsorbed on the surfaces of the substrates was confirmed with the surface analysis (SEM). The porosity percentage is significantly reduced in the inhibitor presence and gradually decreased with increasing concentration. Furthermore, the density functional theory (DFT) and Monte Carlo (MC) simulations were employed to explain the variance in protecting the Al surface from corrosion. Interestingly, the theoretical findings align with their experimental counterparts. The planarity of 2-MBT and the presence of heteroatoms are the playmakers in the adsorption process.

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“…Table shows that THTA-I has a smaller Δ E value (1.52 eV) than THTA-II (2.24 eV) confirming that THTA-I has a greater tendency to be adsorbed on the N80 steel exterior. Furthermore, the low values of electronegativity (χ) provide a high potential reactivity for the examined inhibitors to allow electrons to the investigated surface; however, THTA-I has a greater value of χ (3.75) than THTA-II (3.58), signifying agreement with experimental conclusions; moreover, THTA-I has greater inhibition tendency than THTA-II . Furthermore, the compound stability and susceptibility can be determined by hardness (η) and softness (σ), that is, soft compounds have additional protected potency than hard compounds owing to the smooth delivery of electrons to the N80 steel exterior during the adsorption, thus, they were evaluated as effective protective inhibitors .…”

Section: Resultssupporting

confidence: 62%

“…Furthermore, the low values of electronegativity (χ) provide a high potential reactivity for the examined inhibitors to allow electrons to the investigated surface; however, THTA-I has a greater value of χ (3.75) than THTA-II (3.58), signifying agreement with experimental conclusions; moreover, THTA-I has greater inhibition tendency than THTA-II . 63 Furthermore, the compound stability and susceptibility can be determined by hardness (η) and softness (σ), that is, soft compounds have additional protected potency than hard compounds owing to the smooth delivery of electrons to the N80 steel exterior during the adsorption, thus, they were evaluated as effective protective inhibitors. 64 As evidenced in Table 5 , THTA-I has lower η values and greater σ values than THTA-II , indicating that THTA-I has a high potency for donating electrons to the examined steel and more prohibition potency.…”

Section: Resultsmentioning

confidence: 99%

Corrosion Mitigation Performance of N80 Steel in 5% Sulfamic Acid Medium by Applying Novel Tetrahydro-1,2,4-triazines Including Triazene Moieties: Electrochemical and Theoretical Approaches

El‐Lateef

¹

,

Shalabi

²

,

Arab

³

et al. 2022

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We observed our newly developed tetrahydro-1,2,4-triazines, including triazene moieties ( THTA ), namely, 6-((1E)-1-((2E)-(4-(((Z)-1-(2,4-diphenyl-2,3,4,5-tetrahydro-1,2,4-triazin-5-yl) ethylidene) triaz-1-en-1-yl)piperazin-1-yl) triaz-2-en-1-ylidene) ethyl)-2,4-diphenyl-2,3,4,5-tetrahydro-1,2,4-triazine ( THTA-I ), and 1-((E)-((E)-1-(2,4-diphenyl-2,3,4,5-tetrahydro-1,2,4-triazin-6-yl) ethylidene) triaz-1-en-1-yl) naphthalen-2-ol ( THTA-II ), as effective inhibitors for the corrosion protection of N80 carbon steel metal in 5% sulfamic acid as the corrosive medium via electrochemical approaches such as potentiodynamic polarization and electrochemical impedance spectroscopy. Furthermore, the tested steel exterior was monitored using X-ray photoelectron spectroscopy after the treatment with the investigated components to verify the establishment of the adsorbed shielding film. The investigated compounds acted as mixed-type inhibitors, as shown by Tafel diagrams. The compounds considered obey the Langmuir adsorption isotherm, and their adsorption on the steel surface was chemisorption. When the tested inhibitors were added, the double-layer capacitances, which can be determined by the adsorption of the tested inhibitors on N80 steel specimens, decreased compared with that of the blank solution. At 10 –4 M, the inhibitory efficacy of THTA-I and THTA-II achieved maximum values of 88.5 and 86.5%, respectively. Density-functional theory computations and Monte-Carlo simulation were applied to determine the adsorption attributes and inhibition mechanism through the studied components. Furthermore, the investigated inhibitors were considered to adsorb on the Fe (1 1 0) surface. The adsorption energy was then measured on steel specimens.

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“…6 a,b), and this means that the inhibitor acts as a both anodic, and cathodic inhibitor (mixed one), with predominant anodic effect in H 2 SO 4 medium. On the other hand, for H 2 SO 4 , and HCl solutions, the maximum shift in E corr value is positive/negative side 41, and 15 mV, respectively, and a literature survey revealed that if a shift in corrosion potential is less than ± 85 mV with respect to the blank solution, the inhibitor acts as a mixed-type inhibitor; thus, this inhibitor is a mixed-type inhibitor 51 .…”

Section: Resultsmentioning

confidence: 99%

Investigation of Dracocephalum extract based on bulk and nanometer size as green corrosion inhibitor for mild steel in different corrosive media

Golshani

¹

,

Arjmand

²

,

Amiri

³

et al. 2023

Sci Rep

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In recent years, green corrosion inhibitors derived from natural plant resources have garnered much interest. In the present work, at first, we investigated the corrosion behavior of mild steel (st-37) in the presence, and absence of Dracocephalum extract based on bulk size as a corrosion inhibitor in two widely used acidic environments (0.5 M H2SO4, and 1.0 M HCl), at room temperature. Then, we used Dracocephalum extract based on nanometer size to reduce the optimal concentration of inhibitor, increase the corrosion resistant, and efficiency. Dracocephalum extract does not contain heavy metals or other toxic compounds, and also good characteristics such as low cost, eco-friendly, and widespread availability, make it suitable nature candidate as an environmentally safe green inhibitor. The anticorrosive behavior was assessed using electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PP). In all of the studies, the inhibitory efficiency (IE%) increased as the extract dose was increased. But by using nano extract, in addition to maintaining high efficiency, the amount of inhibitor was reduced significantly. The highest IE% is 94% at the best dose of nano extract (75 ppm), but the highest IE% is 89% at the best dose of the bulk extract (200 ppm) in H2SO4 solution. Also, for the HCl solution, the highest IE% is 88% at the best dose of nano extract (100 ppm), but the highest IE% is 90% at the best dose of the bulk extract (400 ppm), by polarization method. The PP results suggest that this compound has an effect on both anodic, and cathodic processes, and that it adsorbs on mild steel surface according to the Langmuir adsorption isotherm. Optical microscopy, scanning electron microscopy (SEM) analysis, and a solid UV–Visible reflection spectrum were used to investigate the alloys' surface morphology.

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5-(3-Pryridyl)-4H-1,2,4-triazole-3-thiol as Potential Corrosion Inhibitor for AA6061 Aluminium Alloy in 0.1 M Hydrochloric Acid Solution

Cited by 22 publications

References 29 publications

The inhibitive action of 2-mercaptobenzothiazole on the porosity of corrosion film formed on aluminum and aluminum–titanium alloys in hydrochloric acid solution

The inhibitive action of 2-mercaptobenzothiazole on the porosity of corrosion film formed on aluminum and aluminum–titanium alloys in hydrochloric acid solution

Corrosion Mitigation Performance of N80 Steel in 5% Sulfamic Acid Medium by Applying Novel Tetrahydro-1,2,4-triazines Including Triazene Moieties: Electrochemical and Theoretical Approaches

Investigation of Dracocephalum extract based on bulk and nanometer size as green corrosion inhibitor for mild steel in different corrosive media

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