engleski

Bronze Protection in Simulated Acid Rain

Bronzes have been widely used to produce sculptures and other objects of art. Very often they are exposed to corrosive action of polluted atmosphere. Acid rain that forms due to the presence of polluting gases may cause extensive damage on the bronze objects. The SO2 is one of the main pollutants in urban atmosphere due to the industrial activity and the emission by automotive vehicles. For this reason studies of bronze corrosion were performed in simulated acid rain with the composition: 0.2 g L-1 Na2SO4 + 0.2 g L-1 NaHCO3 at pH 3. In order to preserve metal works from the aggressive atmosphere, organic inhibitors are often required. Previous investigations have shown that imidazole derivatives are good copper corrosion inhibitors in different media. In this work the efficiency of two imidazole based corrosion inhibitors: (4-methyl-1-(p-tolyl) imidazole and benzimidazole), was examined on the Cu-6Sn bronze. Corrosion studies were performed by the potentiodynamic measurements and electrochemical impedance spectroscopy (EIS). The results have shown that both studied corrosion inhibitors efficiently protect Cu-6Sn bronze in sulphate-carbonate media.

atmospheric corrosion; bronze; sulfate; corrosion inhibition

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