National Building and Civil Engineering Institute, Lj (ZAGLJ)
13.
Protection of patinas on various bronzes by different type s of inhibitors [Elektronski vir]
Kosec, Tadeja ...
Numerous cultural and historical artefacts are made of bronze. In humid air, bronze is spontaneously covered by oxide films, called patina. However, in urban atmospheres the aggressive air species ...concentrate in acid rain which dissolves patina and the bronze itself. This leads to enhanced deterioration of bronze artefacts and formation of secondary corrosion pro duct. In protection of historical and cultural artefacts, only methods that do not change the visual appearance of the artefact itself can be applied. Such methods include protection of bare metal as well as the patina covering it. One of the possible met hods is the use of corrosion inhibitors. Recent research has shown that imidazole based inhibitors can be succesfully used to protect patinated bronze. A im of this study is to investigate the use of imidazole and benzotriazole type inhibitors (TMI, BTAH) in protection of differe nt type s of bronzes, namely CuSnZn bronze, CuSn ZnPb bronze and CuSnSi bronze. Bronzes that will be studied, will be bare or covered by two type s of patinas: sulphide brown type of patina and electrochemically f ormedpatina that sim ulate s nat urally formed patina on bronze exposed to atmospher e . Morphology and structure of the patinas will be determined usingSEM/EDX and Raman spectroscopy. Then both chemical and electrochemical patina will be studied in environments that simulate u rban environments. The protection properties of corrosion inhibitors will be studied on differentbronzes and on differently patinated bronze samples by the use of electrochemical techniques, such as potentiodynamic measurements and electrochemical imped ance spectroscopy in simulated urban rain. SEM /EDX analysis as well as Raman spectroscopy will be used to evaluate the differently formed patina s before and after the electrochemical experiments. The combination of electrochemical and spectroscopic techniques will enable the study of inhibition mechanisms and inhibition efficiency of the chosen protection method.
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