Process for touching up pretreated metal surfaces

Details Process for touching up pretreated metal surfaces Process for touching up pretreated metal surfaces

C - Chemistry, Metallurgy

23

C

C23C 22/83 (2006.01) B05D 5/00 (2006.01) B05D 7/14 (2006.01) C23C 22/36 (2006.01)

Patent

CA 2286220

Defects in an initial protective coating, particularly a conversion coating, on a metal substrate can be touched up so as to at least equal the original coating in corrosion protection by use of a dry-in-place aqueous acidic liquid comprising: (A) fluorometallate anions; (B) divalent or tetravalent cations of elements selected from the group consisting of cobalt, magnesium, manganese, zinc, nickel, tin, copper, zirconium, iron, and strontium; (C) a component selected from the group consisting of phosphorus-containing inorganic oxyanions and phosphonate anions; and (D) a component of water-soluble and/or dispersible organic polymers and/or polymer-forming resins.

L'invention concerne un procédé de retouche pour corriger les défauts d'une enduction protectrice initiale (en particulier, couche de conversion), sur un substrat métallique, de manière à retrouver au moins la couche d'origine du point de vue de la protection contre la corrosion, en utilisant un liquide acide aqueux à laisser sécher sur place et composé comme suit : (A) anions fluorométallate; (B) cations divalents ou tétravalents d'éléments choisis parmi les cobalt, magnésium, manganèse, zinc, nickel, étain, cuivre, zirconium, fer et strontium; (C) constituant choisi parmi les anions phosphonate et des oxyanions inorganiques à base de phosphore; et (D) constituant à base de polymères organiques hydrosolubles et/ou dispersables dans l'eau et/ou de résines polymériseuses.

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