Abstract
Imidazoline and imidazoline derivatives are extensively employed as effective corrosion inhibitors due to their low toxicity, low cost and environmental friendliness. Their chemical structure consists of a 5-membered heterocyclic ring (C3N2H4) with two nitrogen atoms that are readily adsorbed onto metal surfaces. Also, a pendant side chain or alkyl amine substituent acts as an anchor that helps to maintain its adsorption on steel surfaces. The tail portion is a long hydrocarbon chain that can form a hydrophobic film on a surface. These molecular structures make it very attractive as a starting point for several enhancements in corrosion inhibition research. Moreover, modification of an imidazoline structure can be more effective in enhancing its effectiveness in corrosion inhibition. This review compiled all information regarding imidazoline and imidazoline derivatives used as effective corrosion inhibitors in the petroleum industry. It includes their chemical structures and properties, synthesis processes, characterisation and performance evaluations. The review also gives an overview of various types of imidazoline inhibitors with their preparation processes, metal types, corrosive media and concentration range for measurements.
Funding source: National Energy Technology Center (ENTEC), National Science and Technology Development Agency
About the authors
Nipaporn Sriplai received a PhD degree in material science and nanotechnology from Khon Kaen University, Thailand. Presently, she works as a postdoctoral researcher at National Energy Technology Center (ENTEC), National Science and Technology Development Agency (NSTDA), Thailand. Her research interests lie in the development of corrosion inhibitor formulations to prevent corrosion in gas pipelines and synthesis of corrosion inhibition compounds.
Korakot Sombatmankhong received a PhD in chemical engineering from of University of Cambridge, UK. Currently, she is a senior researcher at National Energy Technology Center (ENTEC), National Science and Technology Development Agency (NSTDA), Thailand. She has more than 10 years of research experience on chemical deformulation/formulation, polymer gel electrolyte, fuel cells, organic synthesis and arsenic/mercury removal. She has been working in several industry-sponsored research projects, such as the development of corrosion inhibition formulation, imidazoline synthesis and pipeline decommissioning processes.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This work was supported by National Energy Technology Center (ENTEC), National Science and Technology Development Agency (NSTDA).
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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