Abstract
In this work, an eco-friendly ionic liquid, 1-pentyl pyridazinium bromide (PPB) was used to investigate the copper corrosion inhibition process in 2M H3PO4 containing 0.3M of NaCl, using weight loss (WL) measurements, potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). Results show that PPB is a good inhibitor and inhibition efficiency (IE %) reach 91% at 10-3 M. Potentiodynamic polarization curves showed that the PPB affects both cathodic and anodic current and may be classified as mixed type inhibitor in 2M H3PO4 + 0.3M NaCl. In addition, the IE % increased with a rise in PPB concentration. While the adsorption of tested compound on copper surface was found to follow the Langmuir isotherm. The mechanism of corrosion inhibition was discussed with the help of the theoretical calculations and molecular dynamic (MD) simulation.
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