Autodeposition coating composition
AssigneeHenkel Corporation
InventorsTakumi Honda, Kazuhisa Naito, Mitsuyuki Koga
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Abstract
The invention is an aqueous autodeposition coating composition that produces a film that has a better adherence and corrosion resistance than the films formed by the prior-art coating compositions, but which does so without a rinse treatment (for example, a chromium containing solution, rinse) prior to film curing. The aqueous autodeposition coating composition has a pH of 1.6 to 5.0 and contains (i) water-dispersible or water-soluble organic film-forming resin, (ii) at least one of fluoride ions or fluoride ions and complex fluoride ions, (iii) hexavalent chromium ion or hexavalent chromium ion+trivalent chromium ion, and (iv) tungstate ion and/or molybdate ion.
Claims17
An aqueous autodeposition coating composition having a pH in the range of about 1.6 to about 5.0 which comprises:
- a) a water dispersible or water-soluble organic film forming resin;
- b) at least one of fluoride ion or fluoride ion and complex fluoride ion;
- c) at least one of water-soluble hexavalent chromium ion or water-soluble hexavalent chromium ion and trivalent chromium ion;
- d) at least one of tungstate ion and molybdate ion;
- and
- e) water.
An autodeposition coating composition having a pH in the range of about 1.6 to about 5.0 which comprises:
- a) 5 to 550 grams/liter of a water soluble or water dispersible film forming resin;
- b) 0.1 to 5 grams per liter of fluoride ion or fluoride ion and complex fluoride ion measured as fluorine;
- c) 0.1 to 20 grams per liter total chromium comprising hexavalent chromium ion and trivalent chromium ion;
- d) 0.1 to 5 grams/liter of at least one of tungstate ion and molybdate ion, wherein the ratio of hexavalent chromium:
- trivalent chromium is from 0.6 to 5.
Dependencies are inferred from the claim text.