Abstract

1,2,4,7,9,10-Hexaazacyclo-pentadeca-10,15-dien-3,5,6,8-tetraone (HPT) a macrocyclic compound has been studied using electrochemical methods and scanning electrochemical microscopy (SECM) techniques. The Rct values increased and Cdl values decreased with the increase in concentration of the inhibitor. The corrosion inhibition of J55 steel in 3.5wt.% NaCl solution saturated with CO2 by polarization studies revealed that HPT acted as a mixed type inhibitor. The adsorption of HPT on the J55 steel surface obeyed the Langmuir adsorption isotherm. The thermodynamic parameters (Kads, ΔG°ads) were also computed and discussed.

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