Trichrome passivates for treating galvanized steel
AssigneeHenkel AG & Co. KGaA
InventorsDavid R. McCormick, Thomas W. Cape
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Abstract
In one embodiment, the invention provides a composition useful for passivating a metal surface, in particular a zinciferous surface, comprising, preferably consisting essentially of, most preferably consisting of water and: (A) dissolved phosphate ions; (B) dissolved trivalent chromium ions; (C) dissolved anions of at least one complex fluoride of an element selected from the group consisting of Ti, Zr, Hf, Si, Sn, Al, Ge and B; preferably Ti, Si and/or Zr; (D) an optional component of dissolved free fluoride ions; (E) organic acid inhibitor, preferably comprising quaternary ammonium compounds; and, optionally (F) a pH adjusting component; and optionally organic hydroxyl acids.
Claims28
A passivation composition for treating a metal substrate, the passivation composition comprising water and the following components:
- dissolved phosphate ions;
- dissolved trivalent chromium ions;
- dissolved fluorometallate ions;
- and
- an organic acid inhibitor comprising a quaternized ammonium compound, wherein the composition contains less than 0.04 percent by weight of nitrates or peroxides, is substantially hexavalent chromium-free and further includes hydroxyorganic acid.
A passivation composition for treating a metal substrate, the passivation composition comprising water and the following components:
- dissolved phosphate ions;
- dissolved trivalent chromium ions;
- dissolved fluorometallate ions;
- and
- an organic acid inhibitor comprising a quaternized ammonium compound, wherein the composition contains less than 0.04 percent by weight of nitrates or peroxides, wherein the quaternized ammonium compound comprises at least one of a nitrogen atom-containing ring having a quantity of ring-carbon atoms ranging from 5 to 14.
A passivation composition for treating a metal substrate, the passivation composition comprising water and the following components:
- dissolved phosphate ions;
- dissolved trivalent chromium ions;
- dissolved fluorometallate ions;
- and
- an organic acid inhibitor comprising a quaternized ammonium compound, wherein the composition contains less than 0.04 percent by weight of nitrates or peroxides, wherein the quaternized ammonium compound comprises an aromatic quaternary ammonium.
Dependencies are inferred from the claim text.