METHOD FOR MANUFACTURING HEXAVALENT IRON ION SOLUTION, ANODIZATION TREATING AGENT AND ANODIZATION TREATMENT METHOD FOR TITANIUM ALLOY AND ANODIZATION TREATMENT METHOD FOR TITANIUM ALLOY MEMBER SURFACE

PROBLEM TO BE SOLVED: To provide a novel anodization treating agent and a novel anodization treatment method by a hexavalent iron ion solution to carry out the anodization treatment as a coloring means to achieve an aim that decorative property or the like is added to the surface of a member of the titanium alloy or the like. SOLUTION: An electrolytic cell 1 partitioned by a cation exchange electrolytic membrane or a bipolar membrane is filled with a predetermined alkaline aqueous solution in the anode side of the cell and is filled with a prescribed alkaline aqueous solution in the cathode side of the cell, an anode made of iron is placed and a cathode made of an optional conductive cathode is placed, and predetermined electric power is supplied from a DC power supply to dissolve the anode made of iron as a hexavalent ion into the aqueous solution to obtain a stable hexavalent iron ion solution. By filling a liquid agent 14 containing stable hexavalent iron ion into an anodic oxidation treatment vessel, connecting the DC power source 13 and an electrode 12 comprising platinum as a cathode to the titanium alloy member 11 as an anode and anodically oxidizing under an optional condition, a titanium member having an anodic oxidation film having an optional appearance of gold, purple, black or the like and excellent in decorative property is obtained. COPYRIGHT: (C)2008,JPO&INPIT