Adsorption and inhibition effect of two aminopyrimidine derivatives on steel surface in H2SO4 solution

Li, Xianghong; Xie, Xiaoguang

doi:10.1016/j.jtice.2014.08.019

Cited by 42 publications

(8 citation statements)

References 75 publications

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“…The low-frequency inductive loop is obtained due to either adsorption of M 2+ (Fe 2+ ) or relaxation of already adsorbed species, such as SO 4 2– and H ads + . 48…”

Section: Resultsmentioning

confidence: 99%

“…Increasing concentration of HTMBH resulted in increased diameter of capacitive loop, which is an indication of increased effectiveness of HTMBH against corrosion of mild steel. The low-frequency inductive loop is obtained due to either adsorption of M 2+ (Fe 2+ ) or relaxation of already adsorbed species, such as SO 4 2– and H ads + …”

Section: Resultsmentioning

confidence: 99%

“…The low-frequency inductive loop is obtained due to either adsorption of M 2+ (Fe 2+ ) or relaxation of already adsorbed species, such as SO 4 2− and H ads + . 48 The increment of impedance or decrease in C dl (double-layer capacitance) with increasing HTMBH concentration, as observed in Table 2, is due to adsorption of the same on MS surface, resulting in increased thickness of the double layer. The relation between double-layer capacitance, C dl , and thickness of the protective layer is given by eq 2.…”

Section: Acs Omegamentioning

confidence: 93%

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2-Hydroxy-N′-((Thiophene-2-yl)methylene)benzohydrazide: Ultrasound-Assisted Synthesis and Corrosion Inhibition Study

et al. 2018

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2-Hydroxy- N ′-((thiophene-2-yl)methylene)benzohydrazide (HTMBH) was synthesized by conventional method as well as by ultrasonication (US). The ultrasound-assisted synthesis of HTMBH was found to have good yield and be more eco-friendly compared to the conventional method of synthesis. The synthesized compound HTMBH was characterized by Fourier transform infrared, 1 H NMR, and CHN analyses. The corrosion inhibition behavior of HTMBH was investigated using gravimetric and electrochemical methods in 0.5 M H 2 SO 4 . The thermodynamic adsorption parameters revealed that HTMBH was adsorbed on the mild steel surface in both ways, physically and chemically, although physisorption is predominant. The study of activation parameters revealed that it is the increase in activation energy that is a prominent factor to lower the corrosion rate in acid medium. Atomic force microscopy analysis is also carried out to investigate the effect of HTMBH on the surface of mild steel surface in acid solution. The contact angle measurement showed decreased affinity of mild steel surface for acid solution containing HTMBH. The results obtained from all of these methods showed good consistency.

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“…The low-frequency inductive loop is obtained due to either adsorption of M 2+ (Fe 2+ ) or relaxation of already adsorbed species, such as SO 4 2– and H ads + . 48…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Acs Omegamentioning

confidence: 93%

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2-Hydroxy-N′-((Thiophene-2-yl)methylene)benzohydrazide: Ultrasound-Assisted Synthesis and Corrosion Inhibition Study

et al. 2018

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“…In 1 M HCl (20°C), 0.5 mM 2-amino-4,6-dihydroxypyrimidine provides good protection of carbon steel, Z = 94.5%, but at t = 50°C it decreases to 79.5% [50]. According to electrochemical studies, in 0.5 M H 2 SO 4 (20C) 10 mM 2-aminopyrimidine and 2,4-diaminopyrimidine hinder the corrosion of cold rolled steel (composition, mass%: С 0.07; Si 0.01; Mn 0,3; P 0.022; S 0,010; Al 0.030) to reach Z = 82.0 and 89.6%, respectively [51]. In dilute 0.05 M HNO 3 (30C) on 1018 carbon steel (composition, mass%: С 0.2; Si 0.003; Mn 0.6; P 0.04) at C in = 17 M, protection increases in the series: 2-aminopyrimidine  2,4-diaminopyrimidine  2,4-diamino-6-hydroxypyrimidine  2,4,6triaminopyrimidine, the observed effects being Z = 36.3, 42.7, 48.5 and 53.3%, respectively.…”

Section: N-containing Six-membered Heterocyclic Compoundsmentioning

confidence: 99%

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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“…According to frontier orbital theory, the reaction of reactants mainly occurred on the HOMO and LUMO, and the formation of a transition state is due to an interaction between the frontier orbitals of the reactants. [26][27][28] So, it was important to investigate the distribution of HOMO and LUMO for exploration of inhibition mechanism. One the one hand, the unoccupied d orbitals of Fe atom can accept electrons from inhibitor molecule to form coordinate bond, and on the other hand, the inhibitor molecule can also accept electrons from Fe atom with its anti-bonding orbitals to form back-donating bond.…”

Section: Computational Studiesmentioning

confidence: 99%

Corrosion control of mild steel in 0.1 M H₂SO₄solution by benzimidazole and its derivatives: an experimental and theoretical study

et al. 2017

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Adsorption and inhibition effect of two aminopyrimidine derivatives on steel surface in H2SO4 solution

Cited by 42 publications

References 75 publications

2-Hydroxy-N′-((Thiophene-2-yl)methylene)benzohydrazide: Ultrasound-Assisted Synthesis and Corrosion Inhibition Study

2-Hydroxy-N′-((Thiophene-2-yl)methylene)benzohydrazide: Ultrasound-Assisted Synthesis and Corrosion Inhibition Study

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

Corrosion control of mild steel in 0.1 M H₂SO₄solution by benzimidazole and its derivatives: an experimental and theoretical study

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Adsorption and inhibition effect of two aminopyrimidine derivatives on steel surface in H2SO4 solution

Cited by 42 publications

References 75 publications

2-Hydroxy-N′-((Thiophene-2-yl)methylene)benzohydrazide: Ultrasound-Assisted Synthesis and Corrosion Inhibition Study

2-Hydroxy-N′-((Thiophene-2-yl)methylene)benzohydrazide: Ultrasound-Assisted Synthesis and Corrosion Inhibition Study

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

Corrosion control of mild steel in 0.1 M H2SO4solution by benzimidazole and its derivatives: an experimental and theoretical study

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Product

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Corrosion control of mild steel in 0.1 M H₂SO₄solution by benzimidazole and its derivatives: an experimental and theoretical study