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Antioxidants
Published in Leslie R. Rudnick, Lubricant Additives, 2017
Robert G. Rowland, Jun Dong, Cyril A. Migdal
The Mannich reaction was used to couple an ethoxylated alkyl phenol with an alkyl arylamine. The resulting products had markedly improved antioxidant activity relative to an equal weight loading of the amine alone and were noted as having improved solubility in oils [145]. Phenolic imidazolines have been prepared from polyaminophenols and carbonyl compounds [146]. In addition to providing antioxidant activity, the products also have corrosion inhibition and metal deactivation properties owing to the cyclic imidazoline moiety.
Corrosion protection of 1018 carbon steel using an avocado oil-based inhibitor
Published in Green Chemistry Letters and Reviews, 2019
O. Sotelo-Mazon, S. Valdez-Rodriguez, J. Porcayo-Calderon, M. Casales-Diaz, J. Henao, G. Salinas-Solano, J. L. Valenzuela-Lagarda, L. Martinez-Gomez
There are two types of corrosion inhibitors developed to prevent CO2 induced corrosion; these inhibitors are based on inorganic and organic compounds. Inorganic inhibitors are mainly chromates and nitrates, which form a film on the metal surface acting as a barrier against corrosive species. The disadvantage of inorganic inhibitors is that these must be added in large doses and sometimes they present low effectiveness. On the other hand, organic inhibitors are added in small doses, and as a result, the cost of investment to inhibit corrosion is reduced. Among the different types of organic inhibitors, imidazoline and their precursors (amide) have been used successfully to prevent corrosion (2). Oleic imidazoline inhibitors have especially proved to be effective for protecting metallic surfaces against corrosion. These are compounds that can be adsorbed on the surface of the metal by the displacement of water molecules, forming a protective barrier/layer which is of an oil-like nature, avoiding free access of corrosive agents (H2O, Cl−, H+ and ) and/or blocking the active sites (3, 4). The adsorption of organic inhibitors depends on the inhibitor’s molecular structure, the metal’s surface charge and type of electrolyte (5).
Electrochemical and molecular modelling studies of corrosion inhibition characteristics of imidazolines on 1Cr steel under sweet conditions
Published in Corrosion Engineering, Science and Technology, 2023
Shivangi Gupta, Rouhollah Yazdi, Martin Andersson, Rajan Ambat
Among the various organic compounds that are currently being used for corrosion inhibition, derivatives of imidazoline are highly preferred due to their high corrosion inhibition efficiency and low toxicity. The imidazoline adheres to the metallic surface and also repels substances that are present in the medium [1]. Therefore, minimal concentrations of inhibitors are required for better efficiencies, leading to lower environmental toxicity [1].