Abstract: A process for removing or reducing the directionality or anisotropy of a surface and for making the surface specular on a substrate material consisting of aluminium or an aluminium alloy, by (a) chemically etching the substrate material, (b) subjecting the etched substrate material substrate material to electrochemical polishing by using a solution, and (c) subjecting the substrate material to additional chemical etching and electrochemical polishing directly after step (b), wherein the surface of the substrate material is not exposed to air between the etching and the electrochemical polishing.
Type:
Grant
Filed:
May 23, 2000
Date of Patent:
August 6, 2002
Assignees:
Norsk Hydro ASA, Glamox Fabrikker AS
Inventors:
John Erik Lein, Cornelis Spooren, Jostein Mårdalen, Jan Morten Søraker, Merete Hallenstvet