Continuous coating of electrical conductors of aluminum or aluminum alloy present in wire- and band form, comprises subjecting aluminum conductor to degreasing, activation of surface in an alkaline bath or coating with desired coating layer

摘要

Continuous coating of electrical conductors of aluminum or aluminum alloy present in wire- (2) and band form, comprises subjecting the aluminum conductor to at least (a) degreasing, (b) activation of a surface in an alkaline bath, (c) anodic conditioning in the presence of a detergent, an acid, and optionally a metal salt, (d) cathodic conditioning in the presence of a detergent, an acid and a metal salt, (e) optionally repeating the steps (c) and/or (d) until at least one layer thickness is reached to 0.025-0.4 mu m of an applied metal layer, or (f) coating with a desired coating layer. An independent claim is also included for aluminum conductors present in wire- or band form comprising a core of aluminum or an aluminum alloy with at least 80 wt.% aluminum, an adhesion-promoting intermediate layer of at least one metal, preferably manganese, iron, cobalt and/or nickel with a thickness of 0.025-0 4 mu m, and a top layer of copper, silver or other metals or combinations of metals. The core material is completely free of aluminum oxide, and a boundary surface with inter-metallic phases is formed between the core material and the intermediate layer.