Experimental and theoretical studies of benzoxazines corrosion inhibitors

Kadhim, Abdulhadi; Al-Okbi, Ahmed K.; Jamil, Dalia M.; Qussay, Ahmed; Al-Amiery, Ahmed A.; Gaaz, Tayser Sumer; Kadhum, Abdul Amir H.; Mohamad, Abu Bakar; Nassir, Mohamed H.

doi:10.1016/j.rinp.2017.10.027

Cited by 81 publications

(30 citation statements)

References 41 publications

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“…Compounds with sulfur atoms are preferred for H 2 SO 4 , whereas that with a nitrogen-containing function are more efficient in HCl [31]. In the continuation of previous studies [32][33][34][35][36], we report on the synthesis and characterization of a new inhibitor derived from thiosemicarbazide. The novelty of this work lies in the synthesis, characterization (spectral techniques and CHN analysis), and employment of novel thiosemicarbazone as a corrosion inhibitor for the protection of mild steel in a 1N H 2 SO 4 solution.…”

Section: Introductionmentioning

confidence: 90%

Synthesis, Characterization, and Corrosion Inhibition Potential of Novel Thiosemicarbazone on Mild Steel in Sulfuric Acid Environment

et al. 2019

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Corrosion of a material by reaction with a corrosive environment is a common problem across many industries. Iraq is an oil country and corrosion represents a large portion of the total costs for oil producing and a natural potential hazard associated with oil production and transportation. The synthesis of novel thiosemicarbazone, namely 2-(2,4-dimethoxybenzylidene)hydrazinecarbothioamide (DMBHC), was conducted and the chemical structure was elucidated via the 1H and 13C NMR (Nuclear magnetic resonance), and FT-IR (Fourier-transform infrared) spectroscopic spectroscopic techniques in addition to carbon, hydrogen, and nitrogen analyses (CHN analyses). The inhibition properties of the investigated thiosemicarbazone were evaluated for mild steel (MS) corrosion in 1N H2SO4 using electrochemical impedance spectroscopy (EIS), weight loss method, and scanning electron microscopy (SEM). Electrochemical and weight loss techniques revealed that the tested thiosemicarbazone acted as a superior inhibitor for the acidic corrosion of MS and the efficiency increased with increasing concentrations. The EIS results revealed that thiosemicarbazone demonstrated the highest inhibition efficiency of 94.86%, at a concentration of 0.5 mM. Results from the weight loss technique suggested that the thiosemicarbazone acted as a mixed type corrosion inhibitor. The impact of temperature on the mechanism of inhibition of the new synthesized inhibitor of the surface of MS in 1N H2SO4 was investigated at various temperatures (30–60 °C) where the inhibitive efficiency diminished with increasing temperatures. The mechanism of inhibition was additionally verified with the methodological data.

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Section: Introductionmentioning

confidence: 90%

Synthesis, Characterization, and Corrosion Inhibition Potential of Novel Thiosemicarbazone on Mild Steel in Sulfuric Acid Environment

et al. 2019

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“…Mild steel coupons texture of C (0.21%), Si (0.38%), Mn (0.05%), P (0.09%), Al (0.01%), and Fe (99.21%) were utilized for weight loss investigations. The coupons were cleaned according to the standard procedure to be specific ASTM G1-03 (13)(14)(15)(16)(17)(18)(19)(20)(21)(22). In a typical methodology, coupons were suspended volume 200 mL of a corrosive solution (in duplicate) to try or not of 2-((thiophen-2-ylmethylene) amino) benzenethiol.…”

Section: Corrosion Testsmentioning

confidence: 99%

Experimental and Quantum Chemical Studies on the Corrosion Inhibition of Mild Steel By 2-((Thiophen-2-Ylmethylene) Amino)Benzenethio in 1M HCl

Mohammed¹

2019

Baghdad Sci.J

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The impact of a Schiff base namely 2-((thiophen-2-ylmethylene)amino)benzenethiol to corrode mild steel in 1 M HCl resolved was evaluated using different weight loss technique and scanning electron microscopy (SEM).different weight measurements to expand that the 2-((thiophen-2-ylmethylene) amino) benzenethiol inhibits the corrosion of mild steel through adsorbing of top for mild steel and block the active locality. The inhibitive impacts of 2-((thiophen-2-ylmethylene)amino)benzenethiol increase with increasing concentration and decrease with increasing temperature. SEM to checking revealed that the alloy surface was quite unaffected and formed protective film on its surface. The investigated inhibitor become as a shield for the mild steel surface from corrosive solution. Quantum chemical investigations corroborate experimental results well. The synthesized inhibitor was characterized employing NMR (nuclear magnetic resonance), FT-IR (Fourier-transform infrared) spectroscopies and CHN elemental analysis.

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“…The parameters as the corrosion potential (Ecorr), Tafel anodic pendant (ba), cathodic pendant (bc), and corrosion current density (icorr) obtained from the curves are shown in Table 2. The inhibition efficiency (ηpol) is calculated with the following equation [40][41][42]:…”

Section: Potentiodynamic Polarization Evaluationmentioning

confidence: 99%

PREPRINT- Adsorption behavior of new theophylline-triazole based derivatives as effective corrosion inhibitors for steel in acidic medium

Espinoza-Vázquez¹,

Rodríguez-Gómez²,

Martínez-Cruz³

et al. 2019

Preprint

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The design and synthesis of a series of theophylline derivatives containing 1,2,3-triazole moieties is presented. The corrosion inhibition activities of these new triazole-theophylline compounds were evaluated by studying the corrosion of API 5L X52 steel in 1 M HCl media. The results showed that an increase in the concentration of the theophylline-triazole derivatives also increases the charge transference resistance (Rct) value, enhancing inhibition efficiency and decreasing the corrosion process. The electrochemical impedance spectroscopy under static conditions studies revealed that the best inhibition efficiencies (~90%) at 50 ppm are presented by the all- substituted compounds. According to the Langmuir isotherm, the compounds 4 and 5 analyzed exhibit physisorption-chemisorption process, with exception of the hydrogen 3, bromo 6 and iodo 7 substituted compound, which exhibit chemisorption process. The corrosion when submerging a steel bar in 1 M HCl was studied using SEM-EDS. This experiment showed that the corrosion process decreases considerably in the presence of 50 ppm of the organic inhibitors. Finally, theoretical study showed a correlation between EHOMO, hardness (η), electrophilicity (W), atomic charge and the inhibition efficiency in which the iodo 7 substituted compound presents the best inhibitor behavior.

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Experimental and theoretical studies of benzoxazines corrosion inhibitors

Cited by 81 publications

References 41 publications

Synthesis, Characterization, and Corrosion Inhibition Potential of Novel Thiosemicarbazone on Mild Steel in Sulfuric Acid Environment

Synthesis, Characterization, and Corrosion Inhibition Potential of Novel Thiosemicarbazone on Mild Steel in Sulfuric Acid Environment

Experimental and Quantum Chemical Studies on the Corrosion Inhibition of Mild Steel By 2-((Thiophen-2-Ylmethylene) Amino)Benzenethio in 1M HCl

PREPRINT- Adsorption behavior of new theophylline-triazole based derivatives as effective corrosion inhibitors for steel in acidic medium

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