Single tank de-oxidation and anodization process

摘要

The invention is a single-bath electrolytic de-oxidation and anodization process in which a workpiece surface such as an aluminum surface is electrolytically de-oxidized and then anodized to form an adhesive oxide layer in the same electrolytic chemical bath without removing the workpiece from the bath. Upon completion of the anodization step, the piece is rinsed in a water bath. The invention further includes recirculating the electrolytic bath through a filter to suppress contaminant levels in the bath to prevent metal ion or organic contaminants from the de-oxidation step from compromising the integrity of the anodization step.