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Abstract
Triethylbismuthine, an organic bismuth compound, was examined as a corrosion inhibitor for iron in 1 N HClO 4, 1 N HCl and 1 N H 2SO 4 by polarization and impedance measurements. This inhibitor is less effective for iron corrosion in acid solutions than the corresponding antimony compound which has previously been tested. However, the protective film formed on the iron surface by treatment with this compound in 1 N HClO 4 is more persistent in the protection of iron against acid corrosion than that formed with the antimony compound. The protective film comprises a monolayer of the inhibitor and anion adsorbed at the solution interface and a film with an outer layer composed of ferrous oxide containing small amounts of bismuth oxide and chloride ion and an inner layer of metallic bismuth. The high persistence of the protective film arises from this inner layer.
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