engleski

Copper Protection under Flow Conditions

Imidazole compounds are known as efficient copper corrosion inhibitors. This work aims to study the inhibiting efficiency of 4-methyl-1-(p-tolyl) imidazole as a copper corrosion inhibitor in 0.5 M NaCl. Investigations are performed on rotating disc electrode (RDE) in order to evaluate the influence of the flow of electrolyte on inhibiting property of 4-methyl-1-(p-tolyl) imidazole. Studies are performed at four rotation rates of working electrode by means of polarization measurements and electrochemical impedance spectroscopy. Results show that the copper corrosion rate in 0.5 M NaCl, with and without studied inhibitor, significantly depends on rotation rate of RDE. Increase of corrosion rate with the increase of rotation rate is observed which can be attributed to faster dissolution of corrosion products. On contrary efficiency of 4-methyl 1-(p-tolyl) imidazole is not very much dependent on rotation of electrode ; it is between 86% and 95% for studied rotation rates. Results obtained by electrochemical impedance spectroscopy show that studied inhibitor acts mainly through hindering the dissolution kinetics rather than the formation of barrier film.

Copper; corrosion inhibitors; imidazole; electrochemical measurements; rotating disc electrode

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