Process for coating and/or touching up coatings on metal...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/38 (2006.01) B05D 1/18 (2006.01) C23C 22/30 (2006.01) C23C 22/83 (2006.01)

Patent

CA 2300942

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: fluorometallate anions; a component selected from the group consisting of phosphorus-containing inorganic oxyanions and phosphonate anions; and an oxidizing agent, preferably a mixture of hexavalent and trivalent chromium. Other preferred optional active ingredients include free fluoride ions, which stabilize the fluorometallate ions against the formation of precipitates, and a fluorinated surfactant. The same composition also forms an effective protective coating over previously uncoated metal, particularly aluminum. The compositions do not contain any substantial amount of silica, which has often been previously used in compositions for similar purposes.

Les défauts d'un couche de revêtement de protection initiale, notamment d'une couche de revêtement obtenue par conversion, sur un substrat en métal peuvent être retouchés de manière à être au moins identiques à la couche de revêtement original du point de vue de la protection contre la corrosion, au moyen d'un liquide acide aqueux séchant sur place et comprenant des anions fluorométallate, un constituant choisi dans le groupe comprenant des oxyanions inorganiques et des anions phosphonate contenant du phosphore, ainsi qu'un agent oxydant, de préférence un mélange d'un chrome hexavalent et d'un chrome trivalent. Les autres ingrédients actifs facultatifs préférés sont les ions fluorure libres, lesquels stabilisent les ions fluorométallate contre la formation de précipités, et un tensioactif fluoré. La même composition forme également une couche de revêtement protectrice efficace sur du métal non revêtu préalablement, notamment l'aluminium. Les compositions ne contiennent aucune quantité sensible de silice que l'on a souvent utilisé antérieurement dans des compositions à des fins similaires.

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