CONTINUOUS ELECTROLYTE COLOURING OF A PRE-ANODISED ALUMINIUM FOIL OR STRIP

摘要

Continuous process for anodizing and subsequent electrolytic colouring of an aluminium strip or foil with A.C. in which the strip after leaving the anodistaion unit passes through an aqueous acidic contacting electrolyte, e.g. dilute sulfuric acid, and then through the aqueous acidic colouring electrolyte containing metal ions and in which the A.C. source is connected to inert electrodes dipping in the contacting and in the colouring electrolyte respectively.