Effects of Acrylate-Caffeylamide Copolymer and Its Analogous Compounds on Corrosion of Mild Steel in Cooling Water System

To develop a highly efficient polymer inhibitor on corrosion of mild steel in cooling water. poly (acrylate-co-caffeylamide) [P(AA/CAm)n, n=1-7], poly (acrylate-co-caffeic acid) [P(AA/CA)], and poly (acrylate-co-cinnamamide) [P(AA/CiAm)] were synthesized under adsorption control by a polymer carboxyl group and deoxygenation by polyphenol. Inhibition of corrosion and scale deposition were studeid. In a solution with a low ionic species concentration, P(AA/CAm)2 and P(AA/CiAm) showed a high corrosion inhibition over a wide range of additive concentrations due to polymer adsorption on the steel surface. In a solution with a high ionic species concentration, P(AA/CAm)4 and P(AA/CA) had improved corrosion inhibition at the addition of low inhibitor concentration and decreased inhibition of scale deposition due to scale retention and steel surface adsorption by polymers.