Patent ID: 8865253
Filing Date: 2014-10-21
Classification: C25D

Abstract:
1. A method of coloring a surface of a zirconium-based metallic glass component, comprising the step of; imparting an interference color selected from gray, blue, purple, gold, yellow, brown and black by forming a film having a thickness of 80 nm or more and 300 nm or less on the surface of the zirconium-based metallic glass component, by heating the zirconium-based metallic glass component at a temperature of 400° C. or more and 450° C. or less for a time period of 1 to 15 minutes, the temperature being equal to or lower than a crystallization temperature of zirconium-based metallic glass in an inert gas atmosphere having an oxygen concentration of 80 ppm or more and 500 ppm or less, wherein the gray color is formed by heating in an argon gas atmosphere having an oxygen concentration of about 300 ppm and a flow rate of about 1 L/min, the blue color is formed by heating in an argon gas atmosphere having an oxygen concentration of about 300 ppm and a flow rate of about 2 L/min, the purple color is formed by heating in an argon gas atmosphere having an oxygen concentration of about 480 ppm and a flow rate of about 1 L/min, the gold color is formed by heating in an argon as atmosphere having an oxygen concentration of about 100 ppm and a flow rate of about 2 L/min, the yellow color is formed by heating in an argon gas atmosphere having an oxygen concentration of about 80 ppm and a flow rate of about 2 L/min, the brown color is formed by heating in a nitrogen gas atmosphere having an oxygen concentration of about 150 ppm and a flow rate of about 1 L/min, and the black color is formed by heating in a nitrogen gas atmosphere having an oxygen concentration of about 100 ppm and a flow rate of about 1 L/min.