Gravimetric, electrochemical and quantum chemical studies of some pyridazine derivatives as corrosion inhibitors for mild steel in 1 M HCl solution

Khadiri, Abdellali El; Saddik, Rafik; Bekkouche, K.; Aouniti, A.; Hammouti, B.; Benchat, N.; Bouachrine, Mohammed; Solmaz, Ramazan

doi:10.1016/j.jtice.2015.06.031

Cited by 141 publications

(67 citation statements)

References 85 publications

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“…A “ k ” atom with a higher f k + is a nucleophilic attack site, whereas a site for electrophilic attack has lower f k – value. Moreover, some researchers like Morell and Khadiri had proposed a dual descriptor, Δ f k , which is defined as the difference between the nucleophilic and electrophilic Fukui functions:

∆ f = f_{k}^{+} - f_{k}^{-} .

…”

Section: Resultsmentioning

confidence: 99%

Experimental and theoretical evaluation of two benzimidazole derivatives for steel corrosion protection in HCl

Zafari

Sarabi

Movassagh

2019

Asia-Pacific J Chem Eng

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The introduction of two new benzimidazole derivatives, 2-nonyl-1H-benzo [d] imidazole (NB) and 2-benzyl-1-hexyl-1H-benzo [d]imidazole (HB), as corrosion inhibitors for steel is presented, and their activities are compared with 1Hbenzo[d]imidazole (B). The experimental performance of these molecules was evaluated by electrochemical techniques, surface observations, and contact angle measurement. The results showed the prominent action with inhibition efficiencies of 98.8% and 99.3% for 3 mM of NB and HB, respectively, at 303K. They are adsorbed on the metal surface base on Langmuir isotherm. It is noteworthy to note that increment of environment acidity causes more efficiency for both molecules so that the order of inhibitive activity in different pHs is pH = 2>pH = 1>pH = 0.1. Additionally, HB provides little better protection than NB. Statistical analysis was conducted to identify influential factors on the efficiency of HB and NB. A general factorial model in the main effect order was used by design of experiment 7 software. Analysis of variance resulted in acceptable R 2 values of 99% and 98% and significance of the applied model. Quantum chemical calculations were carried out to find the optimum structure, molecular parameters, and local reactive sites in gas and solution phase. Calculations exhibited a planar structure for 1-hexyl-1H-benzo[d]imidazole and 2-nonyl-1H-benzo [d]imidazole that is the reason of their high efficiencies.

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∆ f = f_{k}^{+} - f_{k}^{-} .

…”

Section: Resultsmentioning

confidence: 99%

Experimental and theoretical evaluation of two benzimidazole derivatives for steel corrosion protection in HCl

Zafari

Sarabi

Movassagh

2019

Asia-Pacific J Chem Eng

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“…The inhibitory effect of pyridazines decreases with an increase in temperature: the Z value of 5- According to corrosion tests in 1 M HCl (6 h, 25°C) on mild steel, a derivative of hydrogenated pyridazine, 6-methyl-4,5-dihydro-2H-pyridazine-3-one (C in = 0.1-10 mM), provides Z = 92-98%, but in 0.5 M H 2 SO 4 , Z = 21-55% even at C in = 0.1-50 mM [74]. More recent studies performed under similar conditions [75] have shown that mild steel protection by 0.5 mM of this compound is even weaker: Z = 17.7%. However, replacement of the methyl in its molecule with the more hydrophobic phenyl and replacement of the O atom with S results in Z = 98.0%.…”

Section: сOmpoundmentioning

confidence: 88%

Nitrogen-containing six-membered heterocyclic compounds as corrosion inhibitors for metals in solutions of mineral acids – A review

2018

Int. J. Corros. Scale Inhib.

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The current state of studies on metal protection from corrosion in mineral acid solutions by six-membered N-containing heterocyclic compounds is reviewed. Literature data on the protection of various metals in acid solutions by these compounds are summarized. The specific features of their protective action mechanism are discussed. The feasibility of metal protection by formulations containing these compounds, even in high-temperature corrosion, is noted. N-Containing six-membered heterocyclic compounds are prone to adsorption on metal surfaces from mineral acid solutions. Based on the free adsorption energy values of these corrosion inhibitors (CIs) on metal surfaces, it can be deemed with high probability that they are mostly bound to a metal by physical forces, but upon adsorption on its surface they slow down the cathodic and anodic reactions, and eventually inhibit its corrosion. Compounds containing S atoms or bulky substituents are most interesting. These compounds are adsorbed on metals more strongly and behave as more efficient CIs. It often happens that such CIs hinder metal corrosion in HCl solutions but do it much more weakly in H 2 SO 4 , HClO 4 , and H 3 PO 4. A known method for improving the protective effect of N-containing six-membered heterocyclic CIs in these media involves combining them with anionic additives, e.g., halide or rhodanide anions. The heterocycles discussed behave as CIs in "cold" solutions but lose these properties at higher temperatures. Examples of the use of six-membered N-containing heterocycles as CIs of various steels and non-ferrous metals (Al, Cu, Sn, Zn and their alloys) are available in literature. The industrial application of individual six-membered N-containing heterocycles and their derivatives for metal protection in acid media is of little promise and is unjustified. It is more appropriate to use these compounds as components of inhibitor mixtures. Mixed CIs containing these compounds can hinder corrosion even in such corrosive media as high-temperature HCl solutions or hot H 3 PO 4 solutions. The base for creating prospective mixed corrosion inhibitors for metals in acids should be searched for among six-membered heterocyclic compounds containing two or more nitrogen atoms or compounds obtained from natural raw materials. The bibliography includes 150 references.

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“…Without 2,2'-Bipyridyl, the impedance spectrum is composed of two loops: a semicircular high frequency (HF) capacitive loop attributed to charge transfer reaction 26,27 and an inductive loop at low frequencies (LF) attributed either to relaxation process due to FeSO 4 species' adsorption or the inhibitor species on metal surface 28 , and / or at passive film's re-dissolution 29 . With 2,2'-Bipyridyl, the impedance spectra are composed of a single capacitive loop indicating that the corrosion process is controlled by charge transfer phenomenon 11 .…”

Section: Measurements Of Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Inhibition Effect of 2,2’-Bipyridyl on the Corrosion of Austenitic Stainless Steel in 0.5M H2 SO4

Gharbi¹,

Himour²,

Abderrahmane³

et al. 2018

Orient. J. Chem

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The corrosion inhibition of AISI309 austenitic stainless steel by 2,2'-Bipyridyl in 0.5M H 2 SO 4 at 298K was studied using the mass loss' method, the potentiodynamic polarization (Tafel), the linear polarization (LRP) and the electrochemical impedance spectroscopy (EIS). The results showed a mixed inhibition mode and an increase in the charge transfer resistance, due to inhibitor molecules' adsorption at steel surface. This latter obeys to Langmuir isotherm. The observation by scanning electron microscopy (SEM) and the analysis by energy dispersion spectrometry (EDS) confirm an inhibitor film's presence. The calculated inhibition efficiencies are in accordance with 87.78% maximum value.

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Gravimetric, electrochemical and quantum chemical studies of some pyridazine derivatives as corrosion inhibitors for mild steel in 1 M HCl solution

Cited by 141 publications

References 85 publications

Experimental and theoretical evaluation of two benzimidazole derivatives for steel corrosion protection in HCl

Experimental and theoretical evaluation of two benzimidazole derivatives for steel corrosion protection in HCl

Nitrogen-containing six-membered heterocyclic compounds as corrosion inhibitors for metals in solutions of mineral acids – A review

Inhibition Effect of 2,2’-Bipyridyl on the Corrosion of Austenitic Stainless Steel in 0.5M H2 SO4

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