Patent ID: RE40406

Claim:
A composition for coating or touching up or both coating and touching up a metal surface, said composition comprising water and: from about 0.5 millimoles per kilogram to about 240 millimoles per kilogram, a unit hereafter abbreviated as “mM/kg” of a component of fluorometallate 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, aluminum, and boron, and, optionally, one or both of (iii) at least one ionizable hydrogen atom; and (iv) at least one oxygen atom; (B) from about 0.5 grams/liter to about 10 grams/liter, a unit hereafter abbreviated as g/l, of a component of phosphorus-containing inorganic oxyanions or phosphonate anions or both phosphorus-containing inorganic oxyanions and phosphonates anions calculated as the stoichiometric equivalent of H 3 PO 4 ; and (C) from about 0.5 g/l to about 3.5 g/l of hexavalent chromium , ; (D) from about 0.10 g/l to about 2.20 g/l of trivalent chromium cations; and ( E ) a component of surfactant molecules that are not part of any of immediately previously recited components, said surfactant containing carbon atoms and fluorine atoms, said fluorine atoms bonded directly to carbon atoms in the molecules and being selected from the group consisting of anionic surfactants, nonionic surfactants, and cationic surfactants; said liquid composition comprising not more than 0.06% of dispersed silica and silicates.