Aromatic amine‐epoxidized sunflower free‐fatty‐acid adducts as corrosion inhibitors in epoxy‐curable varnishes

Abstract

With strict regulation of environmental pollution, sunflower fatty acids were used to prepare highmolecular-weight aromatic amine adducts by reaction of their epoxidized form [epoxidized sunflower free fatty acid (ESFA)] with five aromatic amines [o-toluidine (o-T), m-toluidine (m-T), p-toluidine (p-T), p-anizidine (p-A), and p-chloroaniline (p-ClA)] under severe conditions of an inert atmosphere and high temperature. The produced adducts were characterized physically, chemically, and by IR spectroscopy. The acid values and oxirane contents of the prepared adducts were determined to confirm the participation of carboxylic groups and epoxy groups, respectively, in the reaction of ESFA with aromatic amines. Also, to avoid volatile organic compounds, the prepared adducts of ESFA (o-T-ESFA, m-T-ESFA, p-T-ESFA, p-A-ESFA, and p-ClA-ESFA) were evaluated as corrosion inhibitors of mild steel in electron-beam-curable epoxy acrylate oligomer formulations. Physical and mechanical measurements were carried out, in addition to corrosionresistance tests and weight loss measurements of the coated steel panels. The optimum concentration of each adduct was determined for the prepared formulations. The corrosion-inhibition efficiency of the adducts in varnish formulations were determined. It was found that varnish formulations containing the prepared aromatic amine adducts could protect steel from corrosion. The corrosioninhibition efficiencies of the prepared aromatic amines in epoxy acrylate oligomer varnishes were arranged as fol-

o-Toluidine in electrochemistry – an overview

“…Similar results were obtained with further Schiff bases [57,58]. Adducts formed from sunflower fatty acids and various substituted anilines have been tested as efficiency-enhancing additives in varnishes [59]. o-Toluidine showed lower efficiency than m-and p-toluidine.…”

Preparation and comparative study of eco-friendly anticorrosion inhibitors based on aliphatic and aromatic compounds for electron beam curable steel coatings

“…Recent researches in corrosion protection of EB-cured steel coatings are focused on the development and using of innovative and eco-friendly corrosion inhibitors in different curable coating formulations ( Ibrahim et al , 2011; Mohamed et al , 2012). According to the increasing concern of green corrosion inhibitors and their reported remarkable performance, the present study is focused on the synthesis of two promising inhibitors based on the natural and biodegradable peanut oil fatty acids with different amines and compares these inhibitors with a common commercial inhibitor.…”