Title:
COLORING METHOD FOR ALUMINUM OR ALUMINUM ALLOY
Document Type and Number:
Japanese Patent JPS5816098
Kind Code:
A
Abstract:
PURPOSE:To obtain a colored film with weather resistance by anodically oxidizing Al, forming a barrier layer by high voltage electrolysis, immersing the Al in an acidic soln., and carrying out electrolysis in a bath contg. metallic salt to cause uniform and stable electrodeposition in the pores of the anodic oxide film. CONSTITUTION:An anodic oxide film is formed on Al (alloy), and a barrier layer is formed and made thicker by electrolysis in a bath contg. boric acid or the like at a higher voltage than the voltage of the anodic oxidation. The Al is immersed in an acidic aqueous soln. such as sulfuric acid to uniformly expand the pores of the anodic oxide film by dissolution. Electrolysis is then carried out in an aqueous soln. contg. metallic salt of Ni, Co, Fe, Zn or the like with AC or a wave-form similar to AC in effect. By this method a gray, blue or green colored film can be stably formed on the Al surface with high productivity.
Inventors:
ITOU FUSAO
FURUHATA HIROSHI
FURUHATA HIROSHI
Application Number:
JP11283181A
Publication Date:
January 29, 1983
Filing Date:
July 17, 1981
Export Citation:
Assignee:
TATEYAMA ALUMINUM KOGYO KK
International Classes:
C25D11/22; (IPC1-7): C25D11/22
Domestic Patent References:
| JPS53128547A | 1978-11-09 |
Attorney, Agent or Firm:
Tomoda Miyata