Abstract: Provided is a hydrophilization treatment agent for an aluminum-containing metal material, for forming a film that can provide excellent hydrophilicity and hydrophilic sustainability, as well as odor property to an aluminum-containing metal material for use in a heat exchanger or the like. The hydrophilization treatment agent for an aluminum-containing metal material contains: organic-inorganic composite particles obtained by combining a water-soluble resin (A) having a hydroxyl group, a poorly water-soluble inorganic oxide (B), an organoalkoxysilane (C), and a surfactant (D) at specific ratios; and water, and the organic-inorganic composite particles are 40 to 100 mass % based on total solid content by mass.

Abstract: To provide a non-chromate surface treatment agent that, without using one or two or more iron group compounds selected from oxides, hydroxides, or oxyhydroxides of iron, nickel, or cobalt, or the like, allows a surface treatment coating having excellent adhesion to an aluminum material or the like and an upper layer film and providing excellent corrosion resistance to the aluminum material or the like to be formed between the aluminum material or the like and the upper layer film, a method for forming a surface treatment coating using the surface treatment agent, and an aluminum material or an aluminum alloy material having thereon the surface treatment coating. The above challenge can be solved by a surface treatment agent that contains a water-soluble or water-dispersible organic polymer (A) containing a carbonyl group and/or hydroxyl group in a unit structure and an organic polymer (B) containing a phosphonic group.

Abstract: Provided is a hydrophilization treatment agent for an aluminum-containing metal material, for forming a film that can provide excellent hydrophilicity and hydrophilic sustainability, as well as odor property to an aluminum-containing metal material for use in a heat exchanger or the like. The hydrophilization treatment agent for an aluminum-containing metal material contains: organic-inorganic composite particles obtained by combining a water-soluble resin (A) having a hydroxyl group, a poorly water-soluble inorganic oxide (B), an organoalkoxysilane (C), and a surfactant (D) at specific ratios; and water, and the organic-inorganic composite particles are 40 to 100 mass % based on total solid content by mass.