Photosynthesis of anticorrosive protective coatings for steel substrate based on acrylated oil containing unsaturated amino acid compounds

Abstract

Novel environment friendly anticorrosive coating formulations for mild steel substrate based on acrylated oil were prepared by using unsaturated amino acid compounds. In the first, epoxidized soybean oil acrylate (ESOA) was hardened and modified by the different functionality of monomers to be used in anticorrosive coating formulations. In this article, new corrosion inhibitors were synthesized through two steps. In step one; renewable resource based palm oil was epoxidized under a well-established condition to form epoxidized triglyceride ester of palm oil (EPO). FTIR and oxirane content analysis were used to confirm the formation of the epoxidation reaction. In step two, the EPO was reacted chemically with 4-aminobenzoic acid (AB) and 2-aminoacrylic acid (AA) under controlled conditions of an inert atmosphere and high temperature to produce EPO/AB and EPO/AA adducts. The prepared adducts were characterized by FTIR-spectroscopy and oxirane content analysis. The adducts are evaluated as corrosion inhibitors via adding different concentrations of them to the ESOA coating formulations. Then all coating films were subjected to UV irradiation. Degrees of rusting, blistering, failure at scribe, and weight loss values were measured for all UV cured films, in addition to the chemical and mechanical measurements. The obtained experimental results revealed that the cured coating films containing EPO/AB inhibitor displayed higher resistance to corrosion on the mild steel substrate than EPO/AA without any effect on the mechanical and chemical properties of cured films. Also, the optimum concentration of the prepared inhibitors was to be 0.5%.