Author/Authors :
bouayad, k. sidi mohamed ben abdellah university - faculty of sciences and technology of fez - laboratory of applied organic chemistry, laboratoire de chimie de la matière condensée, Fez, Morocco , rodi, y. kandri sidi mohamed ben abdellah university - faculty of sciences and technology of fez - laboratory of applied organic chemistry, Fez, Morocco , elmsellem, h. faculté des sciences - laboratoire de chimie analytique appliquée, matériaux et environnement (lc2ame), Oujda, Morocco , abdel-rahman, i. university of sharjah - college of sciences - department of chemistry, Sharjah, United Arab Emirates , el ghadraoui, e.h. université sidi mohamed ben abdallah - faculté des sciences et techniques - laboratoire de chimie de la matière condensée, Fès, Morocco , chakroune, s. sidi mohamed ben abdellah university - faculty of sciences and technology of fez - laboratory of applied organic chemistry, Fez, Morocco , essassi, e. m. université mohamed v - faculté des sciences, urac - laboratoire de chimie organique hétérocyclique, Rabat, Morocco
Abstract :
The corrosion inhibition properties of two imidazo[4,5-b]pyridine derivatives namely, 1-allyl-6-bromo-2-methyl-1H-imidazo[4,5-b]pyridine(KA-2) and 6-bromo-2-methyl-1- (prop-2-ynyl)-1H-imidazo[4,5-b]pyridine (KA-3) for mild steel in 1.0 M HCl at 308 K were studied using density functional theory, weight loss measurements and electrochemical techniques. The obtained experimental results showed that the imidazo[4,5-b]pyridine derivatives are excellent inhibitors and their adsorption on the metal surface was found to follow the Langmuir adsorption model. Electrochemical findings revealed that the imidazo[4,5-b]pyridine derivatives act as a catholic-type inhibitor. These inhibitors increase the polarization resistance and simultaneously decrease the double layer capacitance, which confirm their high ability to protect the metal against dissolution. The mechanism of inhibition of the studied imidazo[4,5- b]pyridine derivatives was discussed in the light of the DFT simulations studies. The theoretical results agree well with the experimental ones.
Keywords :
Imidazo[4 , 5 , b]pyridine , Corrosion , HCl , inhibition , DFT
