[Object] the present invention provides a corrosion-resistant, adhesive, and adhesion-resistant, Provided is a corrosion-resistant treatment of an aluminum foil for a honeycomb core, which is excellent in cost and environmental load aspects. In this corrosion-resistant treatment, the surface of the aluminum foil 1 of the base material stage of the honeycomb core or the surface of the aluminum foil 1 of the cell wall of the molded honeycomb core is first coated with a coating material, An organic and inorganic hybrid coating 2 is formed by coating. The hybrid coating 2 is formed by dispersing at least a titanium compound and aluminum ions ionized from the aluminum foil 1 in a polymer uniformly distributed on the surface of the aluminum foil 1. Next, a mixture of a titanium chelate compound and a silane coupling agent is applied through the formed hybrid coating 2. Thus, the coated mixture coating 6 is...
