Corrosion inhibition properties of pyrazolylindolenine compounds on copper surface in acidic media

Ebadi, Mehdi; Basirun, Wan Jeffrey; Khaledi, Hamid; Ali, Hapipah Mohd

doi:10.1186/1752-153x-6-163

Cited by 19 publications

(7 citation statements)

References 26 publications

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“…As it can be seen, both anodic and cathodic Tafel slopes were changed by the PT extract addition, evidencing that the extract constituents affect both anodic and cathodic reactions. The slight reduction in βa refers to the limiting of metal dissolution [9][10]. Table 3 shows that the inhibition efficiency increased from 58%, at 25 ppm, to 89%, at 200 ppm.…”

Section: Potentiodynamic Polarizationmentioning

confidence: 97%

Iron Corrosion Green Inhibition in a 3% NaCl Solution, by Leaves Extract from Pistacia Terebinthus L. Growing Wild in Morocco

Barbouchi¹,

Benzidia²,

Idrissi³

et al. 2020

Port. Electrochim. Acta

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In the present paper, the methanol extract from the leaves of Pistacia terebinthus L. (PT) was characterized by GC/MS analysis. It was tested as a corrosion inhibitor for iron in a 3% NaCl solution, using gravimetric measurements and electrochemical methods (potentiodynamic polarizations and electrochemical impedance spectroscopy). Fourteen compounds were identified; the major compounds are palmitic acid (31.5%), stearic acid (25.7%) and oleic acid (11.3%). The data showed that the tested extract offers good corrosion resistance. The constituents of the PT extract affected polarization resistance (Rp) and corrosion current density (icorr), demonstrating that the proposed inhibitor hinders corrosion reactions. The results obtained at 200 ppm are very interesting, and reach maximum values of 96.96%, 89% and 64.82%, respectively, which were confirmed by scanning electron microscopy (SEM), coupled with energy scattering of X-ray spectroscopy (EDX).

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Section: Potentiodynamic Polarizationmentioning

confidence: 97%

Iron Corrosion Green Inhibition in a 3% NaCl Solution, by Leaves Extract from Pistacia Terebinthus L. Growing Wild in Morocco

Barbouchi¹,

Benzidia²,

Idrissi³

et al. 2020

Port. Electrochim. Acta

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“…The maximum inhibition efficiency (IE%) of APE calculated using i corr value was 83%, which is significantly more than that of pectin (78.7%) for X60 steel in 0.5 M HCl solution [79] and that of Sarang Semut (Myrmecodia Pendans) extract (65.21%) for low carbon steel in 3.5% NaCl solution [62]. By adding the extract at 3% (v/v), the corrosion potential (E corr ) of the steel increased by more than 85 mV, which shows that APE is an anodic inhibitor and the corrosion inhibition is attributable to change in the activation energy [14,21]. Based on Table 4, the values of anodic and cathodic Tafel slopes were 104.1 and 384.4 mV/dec, respectively for the APE0 sample.…”

Section: Electrochemical Characterization Ocp Measurementsmentioning

confidence: 99%

Mechanism of corrosion protection in chloride solution by an apple-based green inhibitor: experimental and theoretical studies

Nazari

Shihab

Havens

et al. 2020

J Infrastruct Preserv Resil

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Preservation of metals in infrastructures and other assets requires cost-effective and sustainable solutions such as green corrosion inhibitors. This study assesses an apple pomace-derived green inhibitor synthesized by an innovative zero-waste method. Electrochemical measurements revealed the high performance of this liquid extract in reducing the corrosion of carbon steel in NaCl brine. The chemical composition of this inhibitor was characterized by liquid chromatography mass spectroscopy (LC-MS) to shed light on the corrosion inhibition mechanism. Based on LC-MS analysis, the results of surface analysis were interpreted. Specifically, the major corrosion inhibitor agent in the apple pomace extract was determined as C 26 H 50 NO 7 P (1-Linoleoylsn-glycero-3-phosphocholine), which can adsorb onto the steel surface to form a barrier layer and serve as a blocker of active anodic sites. Further study showed that the apple extract adsorption follows the Langmuir isotherm, and physical adsorption is dominant (vs. chemical adsorption). Theoretical calculations using quantum chemistry proposed a physisorption mechanism for the protection of steel by C 26 H 50 NO 7 P molecules.

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“…Kemudahan penambahan substituen ini memungkinkan untuk mengkaji lebih lanjut senyawa turunan pirazolindol sebagai anti korosi guna mencari senyawa terbaik untuk bahan anti korosi. Hasil kajian eksperimental oleh Abadi [15] menunjukkan perubahan gugus substituen pada pirazolindol dapat menyebabkan perubahan sifat anti korosi senyawa secara signifikan.…”

Section: Pendahuluanunclassified

“…Untuk meningkatkan efisiensi anti korosi senyawa pirazolindol maka perlu dilakukan pengujian turunan lain senyawa pirazolindol. Berdasarkan hasil kajian eksperimental dari Abadi [15] maka pada penelitian ini dipilih senyawa thiamida pirazolindol karena secara eksperimental memiliki sifat anti korosi yang tinggi dan turunan senyawa ini belum pernah dikaji secara teoritis.…”

Section: Pendahuluanunclassified

Optimasi Sifat Inhibitor Korosi Senyawa Thiaamida-Pirazolindol Berdasarkan Teori Fungsional Kerapatan

Hamdiani¹,

Arduha²,

Purwoko³

et al. 2016

J. Pijar MIPA

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Abstrak. Sifat inhibitor korosi senyawa turunan thiaamida-pirazolindol (TP) telah dikaji menggunakan teori fungsional kerapatan pada tingkatan teori B3LYP/6-31G(d). Pengaruh gugus substitusi pendonor dan penarik elektron (NH2, SH, CHCH2, CH3, OH, CHO, COOH, F, NO2) terhadap efisiensi anti korosi senyawa thiaamidapirazolindol juga dihitung. Parameter kuantum untuk senyawa anti korosi seperti energi orbital (EHOMO dan ELUMO), potensial ionisasi (I), afinitas elektron (A) dan elektronegativitas (χ) memiliki hubungan yang linier dengan efisiensi anti korosi (IE%) senyawa turunan thiaamida-pirazolindol. Gugus pendonor elektron meningkatkan nilai IE%. Urutan kenaikan IE% adalah NO2 < CHO < COOH < F < CHCH2 < OH < CH3 < NH2. Penambahan gugus pendonor elektron amina (NH2) meningkatkan IE% hingga 98,76 % dibandingkan IE% thiaamida-pirazolindol murni 90,80 %. Penambahan gugus penarik elektron menurunkan IE% hingga mencapai 82,82 %. Kajian teoritis ini akan berkontribusi besar dalam mendesain dan sintesis senyawa inhibitor organik dengan efisiensi inhibitor tinggi.Kata kunci: inhibitor korosi, teori fungsional kerapatan, thiaamida-pirazolindol Abstract. Corrosion inhibitor properties of thiamide pyrazolindole and its derivatives has been elucidated by means of density functional theory (DFT) at B3LYP/6-31G(d) level of theory. Effect of electron donating and withdrawing groups such as NH2, SH, CHCH2, CH3, OH, CHO, COOH, F and NO2 on the corrosion inhibitor of thiamide pyrazolindole derivatives also have been studied. The quantum chemical parameters such as the frontier orbital energies (EHOMO), ionization potential (I), electron affinity (A) and electronegativity (χ) are closely related to the corrosion inhibition efficiency (IE%) of thiamide pyrazolindole derivatives. The presence of electron donating groups increases IE% values meanwhile electron withdrawing groups reduce IE% values. The enhancement of IE% follows NO2 < CHO < COOH < SH < F < CH3 < CHCH2 < OH < NH2. Electron donating NH2 group gives 98,76 % of IE%, pure thiamide pyrazolindol IE% = 90,80 %. In contrast, electron withdrawing NO2 group gives IE% only 82,82 %. This theoretical study would have a significant contribution in designing high-efficiency organic corrosion inhibitors.

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Corrosion inhibition properties of pyrazolylindolenine compounds on copper surface in acidic media

Cited by 19 publications

References 26 publications

Iron Corrosion Green Inhibition in a 3% NaCl Solution, by Leaves Extract from Pistacia Terebinthus L. Growing Wild in Morocco

Iron Corrosion Green Inhibition in a 3% NaCl Solution, by Leaves Extract from Pistacia Terebinthus L. Growing Wild in Morocco

Mechanism of corrosion protection in chloride solution by an apple-based green inhibitor: experimental and theoretical studies

Optimasi Sifat Inhibitor Korosi Senyawa Thiaamida-Pirazolindol Berdasarkan Teori Fungsional Kerapatan

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