Compositions for inhibiting the corrosion of metals in contact with an aqueous system are provided. The corrosion inhibiting compositions may be used to maintain effective amounts of (1) an amino acid-based polymer, such as a polyaspartic acid compound, and (2) a dispersible and/or soluble tin compound in the aqueous system. The corrosion inhibiting compositions include the amino acid-based polymer and a dispersible and/or soluble tin compound and may optionally include a polycarboxylic acid chelating agent and/or a carboxylate/sulfonate functional copolymer.