Treating aluminum with tannin and lithium
AssigneeOxy Metal Industries Corporation
InventorJohn K. Howell, Jr.
Life of this patent
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Abstract
Disclosed are an improved composition and process for the treatment of aluminum surfaces for the purpose of imparting corrosion resistance and improved receptivity of an organic finish. A lithium compound is added to an aqueous tannin composition to obtain this effect.
Claims14
An aqueous chromium-free concentrate composition comprising a vegetable tannin compound and a soluble lithium compound in an amount, at least 0.001 g/l, sufficient, when the concentrate is diluted for use, to improve the corrosion resistance of an aluminum surface treated therewith.
An aqueous chromium-free composition suitable for treating an aluminum surface to improve the corrosion resistance thereof comprising at least 0.00025 g/l of a vegetable tannin compound and a soluble lithium compound in an amount, at least 0.001 g/l, sufficient to improve the corrosion resistance of an aluminum surface treated therewith.
Dependencies are inferred from the claim text.