Abstract: The inhibition effect of 2-aminopyrimidine(2-AP) on the corrosion of cold rolled steel(CRS) in 1.0~5.0 mol/L HCl media at 20~50 ℃ has been studied by mass loss, potentiodynamic polarization curves and electrochemical impedance spectroscopy(EIS) methods. The results showed that the neutral 2-AP is a good inhibitor for CRS, and the adsorption of 2-AP on the CRS surface follows the amended Langmuir adsorption isotherm equation. Inhibition efficiency increases with the inhibitor concentration, while decreases with temperature and the concentration of HCl. Polarization curves showed that 2-AP is a mixed-type inhibitor. EIS spectra exhibited one capacitive loop, and the charge transfer resistance increased with the inhibitor 2-AP concentration.

Key words: aminopyrimidne, hydrochloric acid, cold rolled steel, corrosion inhibition, adsorption