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AssigneeNone recorded
InventorsSatoshi Nishimura, Tomoyuki Kanda, Masayuki Kamimura, Minoru Inoue
Estimating the term…
An object of the present invention is to provide a nonchromate metallic surface-treating agent capable of achieving the corrosion resistance and adhesion with a coating film equal to a chromium phosphate surface-treating agent. A nonchromate metallic surface-treating agent comprising a water-soluble zirconium compound and/or a water-soluble titanium compound (1), an organic phosphonic acid compound (2) and a tannin (3), wherein a content of zirconium and/or titanium of said water-soluble zirconium compound and/or the water-soluble titanium compound (1) is 40 to 1000 ppm on a mass basis, a content of said organic phosphonic acid compound (2) is 20 to 500 ppm on a mass basis, a content of said tannin (3) is 200 to 5000 ppm on a mass basis, and a nonchromate metallic surface-treating agent has a pH of 1.6 to 4.0.
A nonchromate metallic surface-treating agent comprising
Dependencies are inferred from the claim text.
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Not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates: treatment…
Using aqueous acidic solutions with pH less than 6: containing fluorides or complex fluorides
Coating metallic material
Term end not estimated
The present invention relates to a nonchromate metallic surface-treating agent, nonchromate metallic surface-treating method, and aluminum or an aluminum alloy.
As surface treatment of aluminum plates, a chromium phosphate surface-treating agent has been used. Since chemical conversion coats formed with the chromium phosphate surf-ace-treating agent are excellent in the corrosion resistance of the coatings alone and in the corrosion resistance and adhesion after applying various resin base coatings, they are adopted in a wide range of uses of aluminum materials for construction materials, an electric home appliance, fin materials, car evaporators, beverage can materials and the like. However, in recent years, there is required a nonchromate metallic surface-treating agent, which can provide the high corrosion resistance and adhesion equal to a chromium phosphate surface-treating agent, from the view point of environmental protection.
As a nonchromate chemical conversion treating agent, for example, a system where a zirconium or titanium compound is used in conjunction with a phosphoric acid compound for a beverage can material. However, since the chemical conversion coats formed by these systems are of inferior corrosion resistance and adhesion after applying coating in comparison with the coatings formed by the chromium phosphate surface-treating agent, these could not be used for a wide range of uses.
FIG. 1 is a schematic view illustrating the shape of a sample for evaluating corrosion resistance.
1: Plane portion
2: Edge portion
3: Side portion