NOVEL NON-CHROME METAL TREATMENT COMPOSITION
Chromate-free compositions for applying a conversion or passivation coating for metals, more particularly zinc coated metal surfaces. The methods of the invention comprise contacting the requisite metal surface with a phosphonomethylated polyamine. Other aspects of the disclosed tech involve methods and compositions in which the following optional components can be included: fluoacid, silane, inorganic phosphorus, acid, latex film forming component and pH adjustment agent.
1 . Composition for treating metal surfaces to form a conversion or passivation coating thereon, said composition comprising (a) a phosphonomethylated polyamine, (b) a fluoacid, (c) a silane, (d) an inorganic phosphorus acid, and water.
2 . Composition for treating metal surfaces to form a conversion or passivation coating thereon, said composition comprising
(a)
0.01-40 wt %
phosphonomethylated polyamine
(b)
0.00-40 wt %
fluoacid
(c)
0.00-20 wt %
silane
(d)
0.00-50 wt %
inorganic phosphorus acid
(e)
0.00-40 wt %
film forming latex
(f)
0.00-5 wt %
lubricity additive
remainder water, wherein the weight of the composition is, in total, 100 wt %.
3 . Composition as recited in claim 1 comprising
(a)
0.01-40 wt %
phosphonomethylated polyamine
(b)
1-30 wt %
fluoacid
(c)
0.01-20 wt %
silane
(d)
1-30 wt %
inorganic phosphorus acid
(e)
0.00-40 wt %
film forming latex
(f)
0.00-5 wt %
lubricity additive
remainder water and pH adjustment agent, wherein the weight of the composition is, in total, 100 wt %.
4 . Composition as recited in claim 3 wherein said fluoacid (b) comprises H 2 TiF 6 , said silane (c) comprises an aminosilane and said inorganic phosphorus acid comprises H 3 PO 4 .
5 . Composition as recited in claim 4 being devoid of chromium.