| abstract |
An aqueous autodeposition coating composition that is essentially free of chromium compounds and which produces a film with a much better adherence and corrosion resistance than heretofore obtained, but which does so without a rinse treatment with a chromium-containing solution prior to film curing. The aqueous autodeposition coating composition has a pH of about 1.6 to about 5 and contains (i) water-dispersable or water-soluble organic film-forming resin; (ii) at least one of fluoride ions and fluoride ions and complex fluoride ions; (iii) ions of at least one metal selected from zinc, colbat, manganese, nickel, iron, and aluminum; and (iv) tungstate ion and/or molybdate ion. |