METHOD FOR FORMING ANODIZED LAYER AND MOLD PRODUCTION METHOD

摘要

The method for forming an anodized layer comprises: a step for preparing an aluminum film or an aluminum substrate disposed on top of a supporting body; and a step for forming a porous alumina layer (10c) with fine recessed sections (10p), by applying voltage between an anode (E1) electrically connected to the surface of the aluminum film or the aluminum substrate and a cathode (E2) disposed in an electrolyte (E0), with the surface of the aluminum film or aluminum substrate in a state of being brought in contact with the electrolyte. The step for forming the porous alumina layer (10c) includes: a step for increasing the voltage to a target value; and a step for increasing the voltage to a first peak value lower than the target value before increasing the voltage to the target value, and then lowering the voltage to a value lower than the first peak value. The present invention enables the formation of an anodized layer with reduced variation in the recessed sections.