| 摘要 |
A phosphate conversion coating composition that gives superior results, particularly in phosphating surfaces including aluminum, has a composition containing water and: (A) 0.4 - 2.5 g/L of zinc(II) ions, (B) 0.5 to 3.5 g/L of nickel(II) ions, (C) 0.4 to 2.0 g/L manganese(II) ions, (D) at least 8 g/L of phosphate ions, (E) 2.0 to 20 g/L of nitrate ions, (F) 10 to 250 ppm of nitrite ions, (G) not more than 1,000 ppm of aluminum ions, and (H) 10 to 3,500 ppm total fluorine in anions, and the composition has a nickel ion to aluminum ion molar ratio that is at least 1.6, a total fluorine to aluminum ion molar ratio that is at least 5.0, and a nickel ion to total fluorine molar ratio that is at least 0.3. |
