Method of plating and pretreating aluminium workpieces
AssigneeCorus Aluminium Walzprodukte GmbH
InventorsJacques Hubert Olga Joseph Wijenberg, Joop Nicolaas Mooij
Life of this patent
Estimating the term…
Abstract
A method for applying a metal layer onto at least one surface of an aluminium or aluminium alloy workpiece, including the steps of pretreating the surface and applying the metal layer by plating, wherein the pretreating step includes a non-electrolytic treatment by immersion of the workpiece in a single acidic solution, preferably a sulphuric acid solution, having a temperature of at most 100° C. A brazed assembly comprising at least one component of an aluminium workpiece made by this method is also disclosed.
Claims23
A method for applying a metal layer onto at least one surface of an aluminium or aluminium alloy workpiece, comprising the steps of:
- pretreating said surface, wherein the pretreating step comprises the sequential steps of (a) non-electrolytic treatment by immersion of the workpiece in a single acid solution having a temperature of at most 100° C. and selected from the group consisting of a sulphuric acid or phosphoric acid solution, and (b) etching the workpiece using a voltage selected from the group consisting of an a.c. voltage and a pulse-current voltage, said voltage used in an acidic electrolyte capable of dissolving aluminium oxide and maintained at a temperature in the range of 30° C. to 100° C., under conditions such that on the surface of the workpiece no further oxide film is formed;
- and after said pretreating
- applying the metal layer to the pretreated at least one surface by plating.
Dependencies are inferred from the claim text.