TWO-STEP ZINC PHOSPHATING PROCESS

Described are methods for treating a multi-metal assembly. The assembly has a first portion that includes an aluminum substrate and a second portion that includes a non-aluminum metal substrate. The methods include treating the multi-metal assembly by contacting the assembly with a zinc-phosphate composition and contacting the treated assembly with a composition that includes a Group IIIB and/or IVB metal and free fluoride. 1. A method for treating a multi-metal assembly comprising: (i) a first portion comprising an aluminum substrate and (ii) a second portion comprising a non-aluminum metal substrate , the method comprising: (1) phosphate ions;', '(2) zinc ions;', '(3) free fluoride; and', '(4) a Group IIIB and/or IVB metal; and, '(a) treating the multi-metal assembly by contacting the assembly with a zinc-phosphate composition comprising (1) fluorozirconic acid; and', '(2) a second source of fluoride ions., '(b) contacting the treated multi-metal assembly with a composition comprising2. The method of claim 1 , wherein the aluminum substrate comprises an aluminum alloy.3. The method of claim 2 , wherein the aluminum alloy comprises at least 0.25% by weight copper.4. The method of claim 3 , wherein the aluminum alloy comprises 0.50% to 0.90% by weight copper.5. The method of claim 1 , wherein the zinc-phosphate composition comprises a Group IIIB and/or IVB metal comprising zirconium.6. The method of claim 5 , wherein a ratio of the concentration of free fluoride in the zinc-phosphate composition claim 5 , in ppm claim 5 , to the concentration of zirconium in the zinc-phosphate composition claim 5 , in ppm claim 5 , is at least 2.5 to 1.7. The method of claim 5 , wherein the zirconium is present in the zinc-phosphate composition in a concentration of no more than 100 ppm.8. The method of claim 5 , wherein a ratio of the moles per liter of free fluoride in the zinc-phosphate composition to the square root of the moles per liter of zirconium in the zinc-phosphate ...

Pretreatment compositions and methods for coating a metal substrate

Disclosed are pretreatment compositions and associated methods for treating metal substrates with pretreatment compositions, including ferrous substrates, such as cold rolled steel and electrogalvanized steel. The pretreatment composition includes: (a) a group IIIB and/or IVB metal; (b) free fluorine; (c) a source of aluminum ions; and (d) water. The methods include contacting the metal substrates with the pretreatment composition.

METHOD FOR REFUELING A PRE-TREATMENT COMPOSITION

Replenishing compositions and methods of replenishing pretreatment compositions

Replenishing compositions and methods of replenishing pretreatment compositions

Disclosed are replenisher compositions and methods of replenishing pretreatment compositions. The methods include adding a replenisher composition to a pretreatment composition wherein the replenisher composition includes: (a) a dissolved complex metal fluoride ion wherein the metal ion comprises a Group IIIA metal, Group IVA metal, Group IVB metal, or combinations thereof; (b) a component comprising an oxide, hydroxide, or carbonate of Group IIIA, Group IVA, Group IVB metals, or combinations thereof; and optionally (c) a dissolved metal ion comprising a Group IB metal, Group IIB metal, Group VIIB metal, Group VIII metal, Lanthanide Series metal, or combinations thereof.

Replenishing compositions and methods of replenishing pretreatment compositions

Replenishing compositions and methods of replenishing pretreatment compositions

Replenishing compositions and methods of replenishing pretreatment compositions

Disclosed are replenisher compositions and methods of replenishing pretreatment compositions. The methods include adding a replenisher composition to a pretreatment composition wherein the replenisher composition includes: (a) a dissolved complex metal fluoride ion wherein the metal ion comprises a Group IIIA metal, Group IVA metal, Group IVB metal, or combinations thereof; (b) a component comprising an oxide, hydroxide, or carbonate of Group IIIA, Group IVA, Group IVB metals, or combinations thereof; and optionally (c) a dissolved metal ion comprising a Group IB metal, Group IIB metal, Group VIIB metal, Group VIII metal, Lanthanide Series metal, or combinations thereof.

Replenishing compositions and methods of replenishing pretreatment compositions.

Se describen composiciones de reposición y métodos para reponer las composiciones de pretratamiento. Los métodos incluyen agregar una composición de reposición a una composición de pretratamiento donde la composición de reposición incluye: (a) a ión complejo de fluoruro de metal disuelto donde el ión de metal comprende un metal del grupo lIlA, un metal del grupo IVA, un metal del grupo IVB, o combinaciones de los mismos; (b) un componente que comprende un óxido, hidróxido, o carbonato del grupo lIlA, grupo IVA, metales del grupo IVB, o combinaciones de los mismos; y opcionalmente (c) un ión de metal disuelto que comprende un metal del grupo IB, metal del grupo IIB, metal del grupo VIIB, metal del grupo VIII, metal de la serie de lantánidos, o combinaciones de los mismos.

Pretreatment compositions and methods for coating a metal substrate

Disclosed are pretreatment compositions and associated methods for treating metal substrates with pretreatment compositions, including ferrous substrates, such as cold rolled steel and electrogalvanized steel. The pretreatment composition includes: (a) a group IIIB and/or IVB metal; (b) free fluorine; (c) a source of aluminum ions; and (d) water. The methods include contacting the metal substrates with the pretreatment composition.