Croatica Chemica Acta, Vol. 91 No. 4, 2018.
Original scientific paper
https://doi.org/10.5562/cca3440
Two Imidazole Based Corrosion Inhibitors for Protection of Bronze from Urban Atmospheres
Katarina Marušić
orcid.org/0000-0002-5981-8590
; Ruđer Bošković Institute, Radiation chemistry and dosimetry laboratory, Bijenička c. 54, HR-10000 Zagreb, Croatia
Helena Otmačić Ćurković
; Faculty of chemical engineering and technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia
Ema Supnišek Lisac
; Faculty of chemical engineering and technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia
Hisasi Takenouti
; LISE – UPR 15 du CNRS, Université Pierre et Marie Curie, Case 133, 4 Place Jussieu, 75252 Paris Cedex 05, France
Abstract
Two different imidazole based molecules were investigated as corrosion inhibitors for Cu-6Sn bronze in a sulphate/carbonate solution at pH 3 and 5 which simulate a mild and strong polluted urban environment. The tested corrosion inhibitors were 4-methyl-1-phenylimidazole (PMI) and 4-methy1-1-p-tolylimidazole (TMI). The difference between structures is in the additional para positioned methyl, –CH3, group in the phenyl ring of the TMI molecule. Their protective effect was investigated by different electrochemical methods: polarization in wide and narrow potential range and electrochemical impedance spectroscopy. The investigations have shown that both molecules give good protection to the bronze at pH 3, but only TMI showed a good effect at pH 5. The additional –CH3 group in TMI affects the orientation in which the molecule is absorbed on the surface.
This work is licensed under a Creative Commons Attribution 4.0 International License.
Keywords
bronze; corrosion; inhibitor; imidazole; polarization; electrochemical impedance spectroscopy
Hrčak ID:
216277
URI
Publication date:
30.12.2018.
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