Title:
MULTI-COLOR ELECTROLYTIC COLORATION OF ALUMINUM OF ALUMINUM ALLOY
Document Type and Number:
Japanese Patent JPS5855593
Kind Code:
A
Abstract:
PURPOSE:To color aluminum or an aluminum allou optional color such as red, blue or green, by a method wherein an anodic oxidation film is formed in an electrolite based on sulfuric acid in a first process and modified in a acidic bath in a second process and the modified coating is electrolyzed in an electrolytic coloring liquid containing a metal salt such as NiSO4 in a third process. CONSTITUTION:An Al material or an Al alloy material is subjected to electrolytic treatment in an electrolyte based on sulfuric acid in a first process to chemically form an anodic oxidation coating having plural fine pores on the ground material. After washing by water, the anodic oxidation material is immersed in an acidic liquid in a second process to increase the diameter of each fine pore as well as to form plural further finer pores to each pore bottom part in a branched form. Subsequently, in a third process, electrolytic coloring treatment is applied in an electrolytic coloring liquid based on a metal salt such as NiSO4 by passing DC, AC or pulse current to develop a gray color, a bronze color, a blue color, a green color or a reddish purple color on the coating.
Inventors:
ISHIDA SHINICHI
MIZUNO JITSUO
OONAKA TAKASHI
SAKAGUCHI YUUJI
MIZUNO JITSUO
OONAKA TAKASHI
SAKAGUCHI YUUJI
Application Number:
JP15440881A
Publication Date:
April 01, 1983
Filing Date:
September 28, 1981
Export Citation:
Assignee:
NIPPON ALUMINIUM MFG
International Classes:
C25D11/22; (IPC1-7): C25D11/22
Attorney, Agent or Firm:
Tadataka Omori