Elaine F. Silva, Ph.D.; Julio S. Wysard, M.Sc., Chemistry; Tatiana C. Almeida; Merlin C. E. Bandeira, Ph.D., Materials Science; Oscar R. Mattos
Resumo: Adsorption of imidazole, 4-methylimidazole and guanine on copper in chloride solutions was investigated by a combination of weight loss tests with electrochemical and Raman techniques to understand their inhibition efficiency and interaction with the metal. Results revealed that imidazole and 4-methyimidazole are inefficient while guanine was an efficient inhibitor (86 %) due to formation of a passive film. Guanine was not efficient towards API 5L X65 steel corrosion in HCl (~22 %) and the low efficiency was due to physisorption. The insights obtained with the combination of spectroscopic and electrochemical results should aid selecting new efficient nontoxic inhibitors.
