Coordination bonding and corrosion inhibition potential of nitrogen-rich heterocycles: Azoles and triazines as specific examples

• Published in: Coordination chemistry reviews 2023-08, Vol.488, p.215177, Article 215177
• Main Authors: Verma, Chandrabhan, Thakur, Abhinay, Ganjoo, Richika, Sharma, Shveta, Assad, Humira, Kumar, Ashish, Quraishi, M.A., Alfantazi, Akram
• Format: Article
• Language: English
• Subjects: Azoles & triazines; Chelation ability; Coordination bonding; Corrosion inhibition; Multidentate ligands; Nitrogenous heterocyclics
• ISSN: 0010-8545; 1873-3840
• DOI: 10.1016/j.ccr.2023.215177

•The coordination, chelation and corrosion inhibition potential of N-rich heterocyclic are surveyed.•N-rich heterocyclics are widely used in pickling, oil-well acidification and sour, sour and scaling environments.•They become effective by adsorbing using the N-nonbonding electron together with additional adsorption sites.•They form strong chelating complexes and separate metallic species from corrosive environments.•How N-based heterocyclic compounds can form chelates and limit corrosion is also discussed. Heterocyclic compounds including the atoms N, O, S, and P have excellent corrosion inhibition potential due to their ability to coordinate and bond with metallic substrates. For preventing corrosion in a variety of extreme circumstances, such as acid pickling, oil-well acidification, and sour, sour, and scaling environments, nitrogenous heterocyclic compounds have been utilized most frequently. The N-based heterocyclic compounds effectively adsorb on the metal's surface using the nitrogen's nonbonding electron and other adsorption sites. These compounds act as powerful ligands. When their derivatives are appropriately substituted, they combine with the metal and metallic ions to form chelating complexes that keep metallic species away from corrosive environments and so prevent corrosion. The review of the literature indicates that azoles and triazines, as well as other N-heterocyclic compounds having one, two, three, or more nitrogen atoms, are particularly efficient in reducing corrosive effects in aqueous electrolytes. The goal of this review is to talk about the coordination and bonding characteristics of N-based heterocyclic compounds and how they can prevent corrosion. The formation of chelates by N-based heterocyclic compounds and their ability to prevent corrosion has also been covered.