Composition and process for treating metals

Details Composition and process for treating metals Composition and process for treating metals

C - Chemistry, Metallurgy

23

C

C23C 22/78 (2006.01) C23C 22/34 (2006.01) C23C 22/36 (2006.01)

Patent

CA 2166331

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 phosphorous-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.

Un revêtement de passivation sans chrome, équivalent au moins par sa qualité anticorrosion aux revêtements de passivation traditionnels au chromate, peut être appliqué sur des métaux, de l'acier laminé à froid notamment, grâce à un liquide acidifère aqueux séchant sur place et comprenant: (A) un composant anionique dont chaque anion consiste en (i) quatre atomes de fluor au moins et (ii) un atome au moins d'un élément sélectionné parmi titane, zirconium, hafnium, silicium et bore et éventuellement (iii) des atomes d'hydrogène ionisables et éventuellement (iv) un ou plusieurs atomes d'oxygène; (B) un composant cationique comprenant des éléments choisis parmi cobalt, magnésium, manganèse, zinc, nickel, étain, zirconium, fer et cuivre; le rapport entre le nombre total d'anions du composant (A) atteignant au moins 1:5; (C) suffisamment d'acide libre pour conférer à cette composition un pH allant de 0,5 à 5; (D) un composant choisi parmi des oxyanions inorganiques et des anions phosphonate contenant du phosphore; et (E) un composant choisi parmi des polymères organiques et des résines formant des polymères, qui soient solubles et dispersables dans l'eau.

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