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Copper is resistive to corrosion in dry and chloride-free 1-butyl-3-methylimidazolium tetrafluoroborate at room temperature (j(corr) about 1 mu A/cm(2)), and the corrosion rate increases with the temperature and with the concentration of water and chloride (to 20 mu A/cm(2) in the presence of 0.87% of Cl, and of 1.07% water). The activation energy of corrosion is 43.9 kJ/mol in dry and chloride-free 1-butyl-3-methylimidazolium tetrafluoroborate, and it decreases with the water and chloride concentration. The corrosion products contain boron, fluorine, carbon, and nitrogen, that is, products of decomposition of the ionic liquid.
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