Title:
METHOD FOR COLORING METALLIC MATERIAL
Document Type and Number:
Japanese Patent JPH04107288
Kind Code:
A
Abstract:
PURPOSE:To uniformly and stably color the surface of a metallic material with a harmless electrolytic soln. at ordinary temp. in a short time at a low cost by subjecting the metallic material to specified cathodic electrolysis in the electrolytic soln. contg. a specified amt. of niobate. CONSTITUTION:A metallic material to be colored is subjected to cathodic electrolysis at 3X10<-3>-3A/dm<2> current density in an electrolytic soln. contg. 5X10<-3>-1mol/l (expressed in terms of Nb) niobate or further contg. 10<-4>-1mol/l phosphoric acid or phosphate to form a colored coating film of niobium hydroxide or oxide on the surface of the metallic material. By this method, the surface of the metallic material such as a stainless steel material can uniformly and stably be colored with the electrolytic soln. at ordinary temp. in a short time of several sec to several min at a low cost without deteriorating the working environment or causing environmental pollution.
Inventors:
NISHIMURA TOSHIYA
YOSHIZAWA HIDEKAZU
SHIMIZU YOSHIAKI
TAMURA MANABU
YOSHIZAWA HIDEKAZU
SHIMIZU YOSHIAKI
TAMURA MANABU
Application Number:
JP22560590A
Publication Date:
April 08, 1992
Filing Date:
August 28, 1990
Export Citation:
Assignee:
NIPPON KOKAN KK
International Classes:
C25D11/34; C25D9/08; C25D11/36; (IPC1-7): C25D9/08; C25D11/34; C25D11/36
Attorney, Agent or Firm:
Natsuo Shiotani