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OwnerEdgar Busch, J?ouml;rg Hieke +5inventors
InventorsEdgar Busch, J?ouml;rg Hieke, Thomas Kolberg, Peter Schubach, Harald Jaschke, Christoph Klocke, Alfred Rutka
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The invention relates to a method for treating or pre-treating parts, profiles, strips, or wires comprising surfaces of aluminium, or alloys containing aluminium optionally in the presence of surfaces consisting of other metals or alloys with an acidic, aqueous solution containing fluoride and phosphate. Said method is characterised in that the fluoride is present at least partially as a free fluoride in the solution and that in the bath of phosphating solution, the content of free fluoride is maintained within a concentration range of between 5 and 500 mg/l Ffree and that of aluminium is maintained within a concentration range that is less than or equal to 100 mg/l Al ions (including complexed Al). To achieve this, increases in the aluminium content are reduced to contents of less than or equal to 100 mg/l Al ions in the bath, using a precipitation container outside the phosphating bath by circulating the phosphating solution from the phosphating bath to the precipitation container and vice versa.
Method for the treatment or pretreatment of parts, sections, strips or wires with surfaces of aluminium or of alloys containing aluminium—if applicable in the presence of surfaces of further metals or alloys—with an acid aqueous solution containing fluoride and phosphate, characterised in that the fluoride is at least partly present in the solution as free fluoride, and in that, in the bath of the phosphatizing solution,
Method according to one of the preceding claims, characterised in that the alkali ion content in the bath is maintained at a concentration in the range from 1 to 20 g/l.
Method according to one of the preceding claims, characterised in that the free-fluoride concentration in the precipitation tank or in the separate zone of the bath container is 5 to 500 mg/l free fluoride.
Method according to one of the preceding claims, characterised in that the dwell time of the phosphatizing solution in the precipitation tank or in the separate precipitation zone is up to 1 h.
Method according to one of the preceding claims, characterised in that, prior to pickling/phosphatizing, the parts, sections, strips and/or wires to be treated or pretreated are cleaned, rinsed and, if appropriate and separately from the rinsing and cleaning stages, brought into contact with an activating solution, for example on the basis of colloidally dispersed titanium phosphate.
Method according to one of the preceding claims, characterised in that, after pickling/phosphatizing, the treated or pretreated parts, sections, strips and/or wires are rinsed and/or passivated, in particular by means of a passivating solution on the basis of a chromate-containing compound, titanium fluoride, zirconium fluoride, silane, self-organizing molecules for example on the basis of phosphonate, a polymer soluble and/or dispersible in solvent, a soluble rare-earth compound—in particular a soluble cerium-containing compound, with the term rare-earth element also including scandium, yttrium and lanthanum.
Method according to one of the preceding claims, characterised in that the treated or pretreated and/or passivated parts, sections, strips and/or wires are dried after pickling/phosphatizing or after passivation.
Method according to one of the preceding claims, characterised in that the precipitation of the aluminium is effected under normal pressure and at a temperature in the range from room temperature to 70° C.
Method according to one of the preceding claims, characterised in that the formation of the conversion or passivation layer is effected under normal pressure and at a temperature from room temperature to 70° C.
Method according to one of the preceding claims, characterised in that the treated or pretreated and/or passivated parts, sections, strips and/or wires are coated with a lacquer, with another kind of organic coating, with a film and/or with an adhesive layer, if applicable printed and if applicable reshaped, where the metal parts coated in this way can in addition be bonded, welded and/or otherwise connected together with other parts.
Dependencies are inferred from the claim text.