National Building and Civil Engineering Institute, Lj (ZAGLJ)
13.
Protection of electrochemical and chemical patina in aggressive environments containing chlorides [Elektronski vir]
Marušić, Katarina ; Kosec, Tadeja ; Otmačić Ćurković, Helena
Numerous cultural and historical artefacts are made of bronze. In humid and unpolluted air bronze is protected by oxide films, called patina. However, in urban atmospheres aggressive pollutants ...concentrate in acid rain which dissolves patina and the bronze itself. This leads to enhanced deterioration of bronze artefacts. In protection of historical and cultural artefacts, only methods that do not change the visual appearance of the artefact itself can beapplied. Such methods include protection of bare metal as well as the patinacovering it. One of the possible methods is the use of corrosion inhibitors. Recent research has shown that imidazole based inhibitors can be succesfully used to protect patinated bronze. The aim of this study is to investigate the use of imidazole and benzotriazole type inhibitors in protection of patinated bronze. The possibility of prolonged service-life was evaluated for the corrosion inhibitors tested. Since the studies can not be performed using cultural and hystorical objects, patina similar to patina naturally formed in marine environments was synthesized electrochemically. Also, chemical patina was applied to bronze surface. Both patinas were studiedin solutions that simulate agressive marine environment. The protectiveproperties of the investigated corrosion inhibitors were evaluated on differently patinated bronze samples.
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