Synthesis, characterization and corrosion inhibition potential of two novel Schiff bases on mild steel in acidic medium

Pandey, Archana; Singh, Bhupendra; Verma, Chandrabhan; Ebenso, Eno E.

doi:10.1039/c7ra08887f

Cited by 49 publications

(26 citation statements)

References 58 publications

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“…However, the diameter of the capacitive semicircle remarkably increased with the addition of inhibitors indicating that these compounds formed an effective layer on C‐steel. Moreover, Nyquist curves display several inductive loops in the low frequency area, which is related to the relaxation adsorbed molecule of inhibitors on the surface of electrode . The Bode modulus, Figure (1‐b, 2‐b and 3‐b), showed a single time constant, which agreed with the Nyquist plots.…”

Section: Resultssupporting

confidence: 76%

Sulfonated salicylidene thiadiazole complexes with Co (II) and Ni (II) ions as sustainable corrosion inhibitors and catalysts for cross coupling reaction

El‐Lateef

Sayed

Adam

2019

Applied Organom Chemis

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Condensation of 2,5-dihydrazinyl thiadiazole with 5-sodium sulfonate salicylaldehyde afforded dibasic tetradentate pincer N,O,O,N-salicyldiene thiadiazole ligand (H 2 Sanp). The novel dipolar ligand formed para-magnetic pincer complexes within Co (II) and Ni (II) ions (Co-Sanp and Ni-Sanp) under sustainable conditions. The water-soluble ligand and its metal-complexes were estimated by mass, IR and UV-Visible spectroscopy, EA (elemental analyses), TGA (Thermogravimetric analyses), magnetic susceptibility, and conductivity measurements. The catalytic reactivity of Co-Sanp and Ni-Sanp were evaluated in the Suzuki and Buchwald-Hartwig cross coupling reaction in aqueousmethanol binary mixtures. Both reactions of boronic acid or aryl amines with aryl halides gave high chemoselective yield of C-C or C-N product. The inhibition characteristics of H 2 Sanp and its Ni-and Co-complexes were performed for the C-steel corrosion in 1.0 M HCl using electrochemical measurements and surface analysis methods. These methods indicated that the synthesized compounds have served as efficient mixed-type corrosion inhibitors and their adsorption on the steel surface obeyed isotherm model of Langmuir. Co-Sanp inhibitor displays the best corrosion inhibition efficiency, and the capacity is up to 97.11% at of 250 mg L −1 . Surface analysis confirms formation of protective layer on the C-steel surface.

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Section: Resultssupporting

confidence: 76%

Sulfonated salicylidene thiadiazole complexes with Co (II) and Ni (II) ions as sustainable corrosion inhibitors and catalysts for cross coupling reaction

El‐Lateef

Sayed

Adam

2019

Applied Organom Chemis

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“…[32][33][34] In strong corrosive electrolytic media like HCl, H 2 SO 4 , HNO 3 and H 3 PO 4 , the heteroatoms of inhibitor molecules (N, O, S, and P) easily undergo protonation because of their unshared electron pairs. [4,[35][36][37] Therefore, in such electrolytic media, inhibitor molecules (or heteroatoms) exist in the cationic/ protonated forms. [38][39][40] On the other hand, metallic surface become negatively charged because of the adsorption of counterions of electrolytes on the positively charged metallic surface.…”

Section: Interactions: Coordination Chemistrymentioning

confidence: 99%

“…In view of the very high safety and economic losses, the several preventive measures have been developed and implemented depending upon the nature of metallic materials and surrounding atmospheres. Out of all implemented methods, use of synthetic corrosion inhibitors is one of the best methods because of their ease of synthesis, economic behavior, ease of implementation, and high effectiveness . Obviously, the synthetic inhibitors associated with high electron (charge) density in form of extended conjugation and polar functional groups such as –CN, –OH, –NH 2 , –OCH 3 , –NO 2 , –COOC 2 H 5 , –O–, –CONH 2 , –SH, –S–S–, –CSNH 2 , –NH–CS–NH–, –NH–SO 2 –, and –PO (–OC 2 H 5 ) 2 offer strong metal‐inhibitor bondings .…”

Section: Introductionmentioning

confidence: 99%

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Sulfur and phosphorus heteroatom‐containing compounds as corrosion inhibitors: An overview

Verma

Verma²,

Ebenso

et al. 2018

Heteroatom Chemistry

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130

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Use of organic compounds containing nitrogen (N), oxygen (O), sulfur (S), and phosphorus (P) heteroatoms in their molecular structures is one of the most effective, economic, and practical corrosion inhibitors. The effectiveness of the heteroatoms toward metallic corrosion inhibition follows the order: P > S > N > O. The metal‐inhibitor interactions involve the charge sharing between the heteroatoms and empty d‐orbitals of the surface metallic atoms; therefore, a heteroatom with lower electronegativity value is more potent to form strong bonding (charge sharing) with metallic surface as compared to more electronegative heteroatom. Literature study reveals that almost all corrosion inhibitors have either one or more heteroatoms in their molecular structures particularly in the form of polar functional groups, which enhance their adsorption tendency on metallic surface. Present review paper features the collection of some major works that have been published on metallic corrosion inhibition containing these P, S, O, and N heteroatoms. Since now, several review articles have been published describing the application of N and O atoms; however, the reviews on use of P and S heteroatoms are scare. Therefore, aim of the present article was to mainly describe the collection of corrosion inhibitors containing S and P heteroatoms.

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“…Additionally, HCl is used in oil-well in oil and gas industries, industrial cleaning purposes, acid pickling, and impregnating different metallic compounds [5,6]. These days, the use of synthetic corrosion inhibitors is one of the most reliable, convenient, and handy methods for the protection of mild steel from corrosion in acidic environments, due to convenient and effective synthesis procedures and use; easy-to-achieve, tunable properties; and economical value [7,8].…”

Section: Introductionmentioning

confidence: 99%

New, Amino Acid Based Zwitterionic Polymers as Promising Corrosion Inhibitors of Mild Steel in 1 M HCl

Mazumder

2019

Coatings

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The zwitterionic monomers, N,N'-diallylamino propanephosphonate and amino acid residual N,N'-diallyl-l-methionine hydrochloride were synthesized, with excellent yields. These monomers were utilized in the preparation of zwitterionic homo and co-cyclopolymers 5-7 in aqueous solution using 2,2 -azobis (2-methylpropionamidine) dihydrochloride as an initiator. The polymers were characterized by FT-IR, NMR, and TGA. The performance of these synthesized polymers on mild steel in acidic solution was investigated by gravimetric method, Tafel extrapolation, linear polarization resistance, and electrochemical impedance spectroscopy. At 313 K, the maximum inhibition efficiencies of corrosion inhibitors 5-7 at 4.50 × 10 −4 mol L −1 were found to be 85.2%, 83.3%, and 99.5%, respectively. The inhibition efficiencies obtained from gravimetric weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy measurements were in good agreement. Different adsorption isotherms were also explored to find the best fit, and found to obey Langmuir adsorption isotherm. The thermodynamic parameters, such as activation energy (E a ), standard enthalpy of activation (∆H*), standard entropy of activation (∆S*), adsorption-desorption equilibrium constant (K ads ), and standard free energy of adsorption (∆G o ads ), were determined. Electrochemical data indicated that the zwitterionic copolymer 7 acts as a mixed type inhibitor under the influence of anodic control. The surface morphology of mild steel corrosion was evaluated without and with corrosion inhibitors by AFM, SEM-EDX, and XPS, which confirmed the adsorption of inhibitor molecules on the metal surface.

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Synthesis, characterization and corrosion inhibition potential of two novel Schiff bases on mild steel in acidic medium

Abstract: This study reports the synthesis of new Schiff bases namely 5-((4-chloro-3-nitrophenylimino)methyl)-2-methoxyphenol and 2-(4-hydroxy-3-methoxybenzylidineamino)-4-nitrophenol using solid–liquid phase equilibrium diagram and their characterization.

Cited by 49 publications

References 58 publications

Sulfonated salicylidene thiadiazole complexes with Co (II) and Ni (II) ions as sustainable corrosion inhibitors and catalysts for cross coupling reaction

Sulfonated salicylidene thiadiazole complexes with Co (II) and Ni (II) ions as sustainable corrosion inhibitors and catalysts for cross coupling reaction

Sulfur and phosphorus heteroatom‐containing compounds as corrosion inhibitors: An overview

New, Amino Acid Based Zwitterionic Polymers as Promising Corrosion Inhibitors of Mild Steel in 1 M HCl

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