Investigation of Polyacrylamide Containing Capsaicin Monomer as a Novel Corrosion Inhibitor for Mild Steel in Hydrochloric Acid

Abstract

Polyacrylamide containing capsaicin-derived monomer P(AM-MAA-AMPS-HDDE-SA) (PAMAHS) was investigated as a novel green polymer inhibitor for Q235 mild steel at 298 K in 1 M hydrochloric acid solution. Weight loss measurements, electrochemical techniques, and surface investigation methods were conducted to evaluate the inhibition performance and mechanism. The results indicated that the green inhibitor performed well in inhibiting the corrosion of mild steel and that the inhibition efficiency increased with the increase in the PAMAHS concentration. The polarization curves revealed that PAMAHS functions as a mixed-type inhibitor. The outstanding anticorrosion effects could contribute to the PAMAHS molecule film adsorbed on the metal surface following a Langmuir adsorption isotherm, and the hydrophobic groups played an important role in protecting the metal surfaces from corrosion media.