A chromium free conversion coating at least equivalent in corrosion protective quality to conventional chromate conversion coatings can be formed on metals, particularly cold rolled steel, by a dry-in-place aqueous acidic liquid comprising: (A) a component of anions, each of said anions consisting o
A chromium free conversion coating at least equivalent in corrosion protective quality to conventional chromate conversion coatings can be formed on metals, particularly cold rolled steel, by a dry-in-place aqueous acidic liquid comprising: (A) a component of anions, each of said anions consisting of (i) at least four fluorine atoms and (ii) at least one atom of an element selected from the group consisting of titanium, zirconium, hafnium, silicon, and boron, and, optionally, (iii) ionizable hydrogen atoms, and, optionally, (iv) one or more oxygen atoms; (B) a component of cations of elements selected from the group consisting of cobalt, magnesium, manganese, zinc, nickel, tin, zirconium, iron, and copper; the ratio of the total number of cations of this component to the total number of anions of component (A) being at least 1:5; (C) sufficient free acid to give the composition a pH in the range from 0.5 to 5.0; (D) a component selected from the group consisting of phosphorus-containing inorganic oxyanions and phosphonate anions; and (E) a component selected from the group consisting of water-soluble and water-dispersible organic polymers and polymer-forming resins.
대표청구항▼
A process for treating a metal surface, said process comprising steps of: (I) coating the metal surface with a substantially uniform coating of a liquid composition having a pH value within the range of about 0.5 to about 5.0 and consisting essentially of: (A) a component of fluorometallate anions,
A process for treating a metal surface, said process comprising steps of: (I) coating the metal surface with a substantially uniform coating of a liquid composition having a pH value within the range of about 0.5 to about 5.0 and consisting essentially of: (A) a component of fluorometallate anions, each of said anions consisting of (i) at least four fluorine atoms, (ii) at least one atom of an element selected from the group consisting of titanium, zirconium, hafnium, silicon, aluminum, and boron, and, optionally, (iii) ionizable hydrogen atoms, and, optionally, (iv) one or more oxygen atoms; (B) a component of divalent or tetravalent cations of elements selected from the group consisting of cobalt, magnesium, manganese, zinc, nickel, tin, copper, zirconium, iron, and strontium in such an amount that the ratio of the total number of cations of component (B) to the number of anions in component (A) is at least about 1:5 but not greater than about 3:1; (C) a component selected from the group consisting of phosphorus-containing inorganic oxyanions and phosphonate anions; and (D) a component selected from the group consisting of water-soluble and water-dispersible organic polymers and polymer-forming resins; and, optionally, (E) a dissolved oxidizing agent; and, optionally, (F) a component selected from dissolved or dispersed complexes stabilized against settling, said complexes resulting from reaction between part of component (A) and one or more materials selected from the group consisting of metallic and metalloid elements and the oxides, hydroxides, and carbonates of metallic and metalloid elements to produce a reaction product other than a reaction product which is present in solution as part of component (B); and (II) drying into place on the surface of the metal the coating applied in step (I), without intermediate rinsing.
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