Abstract
Aqueous extracts from metallic lead and litharge are corrosive to aluminum due to their initially high pH and to the galvanic corrosion resulting from lead deposition on the aluminum. Aqueous extracts from red lead and basic lead carbonate have lower pH, do not deposit metallic lead on aluminum, and are much less corrosive. Aqueous extracts from lead linoleate, lead ricinoleate, and lead laurate inhibit the corrosion of aluminum and the galvanic corrosion of aluminum coupled to lead. Inhibition is believed to be due to the adsorption of fatty acid anions on the oxide covered aluminum surface. Since the diameter of the fatty acid anions is large, the electric fields accelerating aluminum ions from the metal through the oxide film are very weak. Consequently the corrosion of aluminum in lead soaps is prevented. Inhibition by lead soaps is easily broken down by the simultaneous presence of small quantities of chloride ions.
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