| 摘要 |
<p>The invention concerns a process for producing phosphate coatings on the surfaces of metals, in particular iron, steel, zinc, zinc/nickel alloys, aluminium and/or its alloys or aluminium-steel composites, by spraying, spray dipping and/or dipping, with an aqueous solution containing: 0.01 to 5 g/l of zinc(II) ions, 0.3 to 10 g/l of barium(II) ions, 3 to 50 g/l of phosphate ions, 0 to 2 g/l of fluoride ions, and as accelerator: 0.5 to 30 g/l of nitrate ions and/or 0.01 to 1 g/l of nitrite ions and/or 0.2 to 10 g/l of chlorate ions and/or 0.1 to 2 g/l of an organic nitro compound and/or 0.01 to 5 g/l of a peroxide compound, the pH value of the solution being adjusted to between 2 and 4.</p> |
