National Building and Civil Engineering Institute, Lj (ZAGLJ)
13.
An electrochemical impedance study of the corrosion protection of artificiallyformed patinas on recent bronze
Otmačić Ćurković, Helena ...
The patina that covers bronze often has an aesthetic andžor historical value. It should therefore be protected from corrosion in aggressive urban environments. In the present study, two green ...chemically obtained bronze patinas were examined, as well as an electrochemical patina that resembles thenatural patina. Different protective systems were applied to the samplesČ azole-based inhibitors in an ethanol solution, azole-based inhibitors in polymer coating or wax coating. The efficiency of these protective systems during immersion in simulated urban rainwater was monitored by electrochemicalimpedance spectroscopy. The results showed that the protection of patinated bronzes by the inhibitoržethanol system was long-lasting and mosteffective for electrochemically patinated bronze. Protective properties ofinvestigated inhibitoržParaloid B44 systems were found to depend on inhibitor present in the coating as well as on properties of the patina layer on which it was applied. For all types of patina BTAžParaloid B44 coating exhibited better protecting properties than MTIžParaloid B44 coating. Carnaubawax was found to provide stabile and effective protection, especially for nitrate patinated bronze.
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