Coordination compounds as corrosion inhibitors of metals: A review

Akpan, Ekemini D.; Kumar Singh, Ashish; Lgaz, Hassane; Quadri, Taiwo W.; Kumar Shukla, Sudhish; Mangla, Bindu; Dwivedi, Abhishek; Dagdag, Omar; Sheetal,; Edem Inyang, Etienying; Ebenso, Eno E.

doi:10.1016/j.ccr.2023.215503

Cited by 22 publications

(2 citation statements)

References 170 publications

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“…At the current, organic inhibitor technology receives considerable interests to safeguard mild steel in acid environment due to the available and convenient performance. − The organic compounds that contain conjugated π-systems and heteroatoms such as N, O, P, and S are considered as the basic criteria to be used as the effective corrosion inhibitors. − These organic molecules are attached to a mild steel surface by adsorption, which may be processed by physisorption (such as electrostatic interaction, van der Waals force and π-empty orbitals interactions, and so on) and chemisorption (forming chemical bonds). , As a result, the adsorption of the organic inhibitors is followed by the supply of a protection barrier on mild steel that reduces the occurrence of corrosion of metals.…”

Section: Introductionmentioning

confidence: 99%

Helmet-Roled Molecules Carrying Double Metronidazole Frameworks and Phenyl Ring for Strengthening Adsorption and Anticorrosion on Mild Steel

Zhong,

Chen,

Jian

et al. 2024

Langmuir

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This study prepared new helmet-roled molecules (HMs) carrying metronidazole frameworks and a phenyl ring for strengthening adsorption and anticorrosion on mild steel. The adsorption of the HMs on the copper surface was understood by material simulation computation. Furthermore, the surface analysis experiments suggest that the studied molecules could be adsorbed to a mild steel surface through the chemical coordination bonding. The remarkable corrosion resistance of the HMs for mild steel in HCl was surveyed by potentiodynamic polarization and electrochemical impedance spectroscopy at 298 K. The HMs including two metronidazole skeletons displayed the stronger corrosion inhibition effect on mild steel than the HM1 bearing one single metronidazole part (the corrosion inhibition efficiency, HM3, 98.03%, HM2, 95.14%, HM1, 88.72%). The results presented in this study provided an efficient strategy to develop new clinical medicine-based corrosion inhibitors for metal in acid medium through molecular preconstruction.

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Section: Introductionmentioning

confidence: 99%

Helmet-Roled Molecules Carrying Double Metronidazole Frameworks and Phenyl Ring for Strengthening Adsorption and Anticorrosion on Mild Steel

Zhong,

Chen,

Jian

et al. 2024

Langmuir

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“…If the pigment is easily soluble, it is quickly depleted, and blisters are formed by osmotic processes [2][3][4][5]. Pigments with chemical action and complexing properties bind iron ions leaving the metal surface during corrosion in the form of coordination compounds, and through further reactions with atmospheric oxygen, they then create a film that blocks the activity of the anodic sites of corrosion cells (for example phosphates, molybdates) [6,7].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Testing of Anti-Corrosion Properties of New Pigments Containing Structural Units of Melamine and Magnesium Cations (Mg2+)

Kohl,

Alafid,

Boštíková

et al. 2023

Coatings

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This paper deals with the properties and testing of newly prepared organic pigments based on melamine cyanurate containing magnesium or zinc cations depending on their composition and anticorrosive properties in model coatings. Organic pigments based on melamine cyanurate with Mg2+ in the form of a complex differing in the ratio of melamine and cyanurate units were prepared. Furthermore, a pigment based on melamine citrate with magnesium cation Mg2+, a pigment based on melamine citrate with magnesium cation, and a pigment based on melamine cyanurate with zinc cation were prepared. The properties of Mg-containing organic pigments were also compared with those of selected magnesium-containing inorganic oxide-type pigments. The above-synthesized pigments were characterized by inductively coupled plasma-optical emission spectroscopy, elemental analysis, scanning electron microscopy, and X-ray diffraction. In addition, the basic parameters that are indicative of the applicability of the pigments in the binders of anti-corrosion coatings were determined. The anti-corrosive properties of the tested pigments were verified after application to the epoxy-ester resin-based paint binder in three different concentrations: at pigment volume concentrations of 0.10%, 0.25%, and 0.50%. The anticorrosive effectiveness of pigmented organic coatings was verified by cyclic corrosion tests in a salt electrolyte fog (NaCl + (NH4)2SO4) in an atmosphere containing SO2 and by the electrochemical technique of linear polarization. Finally, the effect of the structure of the pigments on the mechanical resistance of the organic coatings was investigated. The results obtained showed that the new organic pigments exhibit anticorrosive properties, and at the same time, differences in performance were found depending on the structure of the pigments tested. Specifically, the results of cyclic corrosion tests and the electrochemical technique of linear polarization clearly demonstrated that synthesized pigments of the organic type based on melamine cyanurate containing magnesium or zinc cations ensure the anti-corrosion efficiency of the tested organic coatings. The highest anti-corrosion efficiency was achieved by the system pigmented with synthesized melamine cyanurate with magnesium cation (C12H16MgN18O6), whose anti-corrosion efficiency was comparable to the anti-corrosion efficiency of the tested inorganic pigment MgFe2O4, which was prepared by high-temperature solid-phase synthesis. In addition, these organic coatings achieved high mechanical resistance after being tested using the most used standardized mechanical tests.

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Advancing Heterogeneous Organic Synthesis With Coordination Chemistry‐Empowered Single‐Atom Catalysts

Ye,

Li,

Zhang

et al. 2024

Advanced Materials

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For traditional metal complexes, intricate chemistry is required to acquire appropriate ligands for controlling the electron and steric hindrance of metal active centers. Comparatively, the preparation of single‐atom catalysts is much easier with more straightforward and effective accesses for the arrangement and control of metal active centers. The presence of coordination atoms or neighboring functional atoms on the supports' surface ensures the stability of metal single‐atoms and their interactions with individual metal atoms substantially regulate the performance of metal active centers. Therefore, the collaborative interaction between metal and the surrounding coordination environment enhances the initiation of reaction substrates and the formation and transformation of crucial intermediate compounds, which imparts single‐atom catalysts with significant catalytic efficacy, rendering them a valuable framework for investigating the correlation between structure and activity, as well as the reaction mechanism of catalysts in organic reactions. Herein, comprehensive overviews of the coordination interaction for both homogeneous metal complexes and single‐atom catalysts in organic reactions are provided. Additionally, reflective conjectures about the advancement of single‐atom catalysts in organic synthesis are also proposed to present as a reference for later development.

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Coordination compounds as corrosion inhibitors of metals: A review

Cited by 22 publications

References 170 publications

Helmet-Roled Molecules Carrying Double Metronidazole Frameworks and Phenyl Ring for Strengthening Adsorption and Anticorrosion on Mild Steel

Helmet-Roled Molecules Carrying Double Metronidazole Frameworks and Phenyl Ring for Strengthening Adsorption and Anticorrosion on Mild Steel

Preparation and Testing of Anti-Corrosion Properties of New Pigments Containing Structural Units of Melamine and Magnesium Cations (Mg2+)

Advancing Heterogeneous Organic Synthesis With Coordination Chemistry‐Empowered Single‐Atom Catalysts

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