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Original Articles Open Access
Corrosion inhibition effect of 4-(2-chlorobenzyl)-6-hydrazino-3-methyl-1,6-dihydropyridazine (P2) on copper corrosion was studied in 2.0 M HNO3 solutions in the temperature range from 303K to 343K using gravimetric and electrochemical impedance spectroscopy (EIS) technique. The results obtained from the both measurement techniques revealed good inhibitor efficiency in the studied concentration range. The inhibition efficiency decrease with rise in temperature. Impedance measurements showed that the double-layer capacitance decreased and charge-transfer resistance increased with increase in the inhibitor concentration and hence increasing in inhibition efficiency. The results obtained from the different methods are in good agreement. Various parameters (Ea, DGads, Kads) for adsorption reveal a strong interaction between inhibitor and copper surface. Adsorption followed the Langmuir isotherm with negative values of DGads , suggesting a stable and a spontaneous inhibition process. Kinetic parameters activation such as Ea, ΔHa, ΔSa and pre-exponential factor have been calculated and discussed.
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Author(s): L Afrine A Zarrouk H Zarrok R Salghi R Touir B Hammouti H Oudda M Assouag H Hannache M El Harti and M Bouachrine
Pyridazine inhibitor, Copper, HNO3, EIS, Gravimetric, electrochemical impedance spectroscopy