Synthesis and application of poly ionic liquid-based on 2-acrylamido-2-methyl propane sulfonic acid as corrosion protective film of steel

Abstract

The present work aims to prepare new ionic liquid polymers based on protonation of diethylethanol amine (DEEA) with polymerizable monomers such as 2-acrylamido-2-methyl propane sulfonic acid (AMPS) and acrylic acid (AA). The polymerizable monomer was polymerized without solvent to prepare viscous poly ionic liquid as AMPS/AA-QA. The chemical structure and thermal characteristics of AMPS/AA-QA were investigated by NMR, DSC and TGA. The wetting characteristics of AMPS/AA-QA were measured at the steel surface by measuring the contact angles. This work describes the successful performance of AMPS/AA-QA as eco-friendly corrosion inhibitors for steel in acidic chloride solution. Corrosion inhibition of steel was carried out by electrochemical techniques. The experimental results reveal that AMPS/AA-QA is efficient mixed type corrosion inhibitors. Inhibition efficiency of 93.7% is reached with 25ppm of AMPS/AA-QA. The Nyquist plots composed of one capacitive loop and its diameter increases with increasing AMPS/AA-QA concentrations. The adsorption of AMPS/AA-QA on steel surface obeys Langmuir isotherm.