PATINA FORMING BASE MATERIAL, PRODUCTION OF THE BASE MATERIAL AND FORMATION OF PATINA USING THE BASE MATERIAL

摘要

PURPOSE: To provide a patina forming base material capable of forming natural patina to be used for roofing in its early stage and to artificially form patina in the base material. ;CONSTITUTION: AC electrolysis is applied on the surface of a base material with at least its surface consisting of copper or copper alloy to obtain a patina forming base material on which a porous layer having many micropores with the opening 1 narrowed is formed. Patina is artificially formed in the base material. Water, moisture and patina component are easily held by the base material because of its porous surface. Accordingly, natural patina is formed in its early stage, and the patina formed in the base material is anchored in the base material surface and hardly released.;COPYRIGHT: (C)1995,JPO