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Triazolic compounds as corrosion inhibitors for copper in hydrochloric acid

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Purpose ‐ To correlate the inhibitory effect of triazole compounds on the corrosion of copper in HCl at various temperatures by semi-empirical molecular orbital theory. Design/methodology/approach ‐ Two triazoles were selected as the best inhibitors among the triazole compounds tested. Gravimetric and electrochemical measurements were conducted. Findings ‐ Correlation between inhibition efficiency and calculation of molecular orbital of triazole compounds was obtained. Cu(I)-triazole complex formation was confirmed by UV spectroscopy. Research limitations/implications ‐ The calculation of energetic levels of molecular orbital may be a tool to explain the classification of inhibitor efficiency. Practical implications ‐ The theoretical calculation is a complementary mean to selecting an efficient inhibitor among a given series. Good agreement between the experimental methods explored and theoretical calculations was observed. Originality/value ‐ The originality of this work was the finding of the correlation between energetic levels of orbital molecular and inhibitor efficiency of triazole compounds. The confirmation of the formation of Cu(I)-triazole by UV-visible spectroscopy was also new.
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Keywords: Acids; Copper; Corrosion; Corrosion inhibitors

Document Type: Research Article

Publication date: May 29, 2007

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