Two pyrazine derivatives as inhibitors of the cold rolled steel corrosion in hydrochloric acid solution

• DOI: 10.1016/j.corsci.2010.11.019
• Publication Date: 2010-11-24T04:25:40Z
• Authors: Shuduan Deng; Xianghong Li; Hui Fu
• Keywords: 02 engineering and technology; 0210 nano-technology

The inhibition effect of two pyrazine derivatives of 2-aminopyrazine (AP) and 2-amino-5-bromopyrazine (ABP) on the corrosion of cold rolled steel (CRS) in 1.0 M hydrochloric acid (HCl) was studied by weight loss, potentiodynamic polarization curves, and electrochemical impedance spectroscopy (EIS) methods. The results show that both AP and ABP are good inhibitors, and inhibition efficiency follows the order: ABP > AP. The adsorption of each inhibitor on CRS surface obeys Langmuir adsorption isotherm. Potentiodynamic polarization curves show that two pyrazine derivatives act as mixed-type inhibitors. EIS spectra exhibit one capacitive loop and confirm the inhibitive ability.