Advancement of corrosion inhibitor system through N-heterocyclic compounds: a review

Abstract

Organic compounds containing heteroatoms have been comprehended to exhibit a remarkable tendency towards corrosion mitigation. This corrosion mitigating tendency is enabled by the presence of electron clouds composed of lone pairs, pi-electrons, which allow them to be adsorbed over metallic equivalents. Because of the availability of nitrogen as heteroatoms, these compounds are being extensively used for corrosion diminution. This article looks at a variety of heterocyclic organic compounds like imidazole, triazole, pyridine, pyrazole, quinoline, tetrazole, pyrimidine, purine and pyrrole, having nitrogen as their prime constituent heteroatom for their anti-corrosive properties. The anti-corrosive properties of these nitrogen-based compounds in acidic conditions have been demonstrated using all available experimental techniques such as EIS, PDP and other theoretical investigations such as DFT and MD. Furthermore, the shift in the trend of these compounds inhibitory efficiencies has been noted and underlined here.

Exploring corrosion protection for mild steel in HCl solution: An experimental and theoretical analysis of an antipyrine derivative as an anticorrosion agent

“…Numerous factors influence the inhibition process, with the metal surface charge and the state of organic molecules in a corrosive environment being particularly influential in the adsorption process. [95][96][97][98][99] Previous research [100][101][102][103] has demonstrated that mild steel surfaces in HCl solution carry a net positive charge, leading to preferential adsorption of chloride ions on the surface. As a result, excess electrons are generated, facilitating the adsorption of cationic species.…”

Heterocycles as supramolecular handles for crystal engineering: a case study with 7-(diethylamino)coumarin derivatives

“…As part of our investigation, we currently explore the integration of the 7-DAC core to nitrogenated heterocycles, as plausible interfaces between 7-DAC and complexes of transition metal ions. In this context, the 1,2,4-triazole ring caught our attention due to its known effectiveness as part of corrosion inhibitors for lowcarbon steel, [20][21][22][23][24][25][26] and to its use as a building block of lightemitting devices in organic electronic applications due to the luminescent properties and ready thin-lm formation of several of its derivatives. [27][28][29][30][31] Moreover, it has recently become an important synthon for Metal-Organic Frameworks (MOFs) and coordination polymers.…”

Experimental Study of Corrosion Inhibition of Carbon Steel in Acidic Environment Using Natural Guar Gum

“…The inhibition characteristic of natural extracts is greatly depends on available heteroatoms (O, N and S) with lone pair electrons and larger molecular size. These heteroatoms contain electron-rich sites which act as centre for adsorption, enables the inhibitor to adsorb on metallic surface, and hence, restrict the corrosion reactions [14]- [17].…”