| abstract |
A corrosion-protection composition that generally includes a water-soluble trivalent chromium salt and a water-soluble polymer is disclosed. The composition preferably is in the form of an aqueous solution (i.e., the composition additionally includes water as a solvent) that can be applied to an active-metal substrate to form a coated substrate and a corrosion-protection film upon drying. Additional ingredients in the corrosion-protection composition can include a second water-soluble salt (e.g., cobalt, manganese, nickel, and/or iron salts), a crosslinking agent, and/or a coloring agent. The corrosion-protection composition is substantially free of hexavalent chromium, capable of forming a film on an active-metal substrate, and is substantially non-reactive with the active-metal substrate. Once applied, the corrosion protection-film is resistant to moisture. |