engleski

The inhibiting effect of 1-phenyl-4-methyl imidazole on bronze

From antiquity bronzes have been widely used to produce sculptures and other objects of art. Bronze, as an alloy of copper, is much more stable than copper itself, in atmospheric conditions. Because of the later increased air pollution (acid rain), artifacts made of bronze have become more soluble. This is the reason why it has become necessary to protect these artifacts.To simulate atmospheric conditions the measurements on bronze were made in an aerated solution composed of 0.2 g L-1 Na2SO4 + 0.2 g L-1 NaHCO3. The SO42- ions are one of the main pollutants in urban atmosphere due to the industrial activity and the emission by automotive vehicles. To simulate conditions of acid rain the solutions pH value was adjusted to pH3 by addition of a dilute sulphuric acid. All experiments were performed at room temperature using by electrochemical methods: potentiodynamic measurements and the electrochemical impedance spectroscopy. Organic inhibitors are often used for protection of bronze. Previous investigations1-3 have shown that imidazole derivatives are good copper corrosion inhibitors in different media. The aim of this work was to investigate the efficiency and optimal concentration of a non-toxic organic inhibitor: 1-phenyl-4-methyl-imidazole as a bronze corrosion inhibitor.

bronze protection; acid rain; corrosion inhibitor

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