Abstract: A method of surface treating an aluminum alloy base body of an heat exchanger which method enables an etching procedure to be carried out uniformly and quickly and a corrosion-resistant chemical conversion coating to be formed, is effected by pretreating the Al heat exchanger base body with an aqueous pre-treating liquid having a pH of 9.0 or less, etching the pretreated base body with an aqueous alkaline solution having a pH of 9.0 or more, and then subjecting the etched base body to a chemical conversion treatment or a hydrophilicity-enhancing treatment.

Abstract: A method of surface treating an aluminum alloy base body of an heat exchanger which method enables an etching procedure to be carried out uniformly and quickly and a corrosion-resistant chemical conversion coating to be formed, is effected by pretreating the Al heat exchanger base body with an aqueous pre-treating liquid having a pH of 9.0 or less, etching the pretreated base body with an aqueous alkaline solution having a pH of 9.0 or more, and then subjecting the etched base body to a chemical conversion treatment or a hydrophilicity-enhancing treatment.

Abstract: An aluminum alloy heat exchanger having excellent hydrophilicity and resistance to absorption or impregnation of tobacco odorous components has an organic hydrophilic coating layer formed on at least a portion of a base body of the heat exchanger and containing (A) at least one chitosan compound, (B) at least one two or more carboxyl group-containing organic compound and (C) at least one hydrophilic polymeric substance different from the components (A) and (B), in which the total solid content of components (A) and (B) is 20 mass % or more and the solid content of component (C) is 0.1 to 10 mass %.

Abstract: An aluminum alloy heat exchanger resistive to impregnation of tobacco odor includes a base body of an aluminum alloy heat exchanger and an organic hydrophilic coating layer formed on the surface of the heat exchanger base body, and including a component (A) containing a chitosan compound selected from chitosan and derivatives thereof, and a component (B) containing a carboxylic compound having two or more carboxyl groups per molecule thereof, in a total solid amount of the components (A) and (B) of 20% by mass or more, based on the total amount by mass of the organic hydrophilic coating layer.

Abstract: The surface of aluminiferous metal is coated with a treatment agent that contains

Abstract: The object of the present invention is to provide a metal surface treatment agent which improves the press molding workability of metal materials, and which can form a coating film that is superior in terms of at least one of moisture resistance and coating film stripping characteristics. The metal surface treatment agent of the present invention comprises (A) a copolymer which comprises (a) styrene and (b) a vinyl compound with carboxyl groups that is copolymerizable with styrene, and (B) a lubricating agent. The metal surface treatment agent is characterized by the fact that the weight ratio of component (a) to component (b) in the aforementioned polymer (A), i.e., (a)/(b) (weight ratio), is in the range of 1/9 to 9/1, the proportion of (a)+(b) in the aforementioned polymer (A) is 30 to 100 weight %, and the weight ratio of (B) to (A)+(B) is 2 to 30 weight %.

Abstract: An agent suitable for use in preparing metal surfaces, especially surfaces containing aluminum, is provided which contains at least one water-soluble vanadium compound, at least one titanium-containing or zirconium-containing water-soluble complex fluoride, and at least one resin. The agent is capable of forming a strongly rust preventive base coating that is highly adherent for top coats and bonded films.

Abstract: An aluminum alloy heat exchanger having excellent hydrophilicity and resistance to absorption or impregnation of tobacco odorous components has an organic hydrophilic coating layer formed on at least a portion of a base body of the heat exchanger and containing (A) at least one chitosan compound, (B) at least one two or more carboxyl group-containing organic compound and (C) at least one hydrophilic polymeric substance different from the components (A) and (B), in which the total solid content of components (A) and (B) is 20 mass % or more and the solid content of component (C) is 0.1 to 10 mass %.

Abstract: An aqueous coating composition for metal sheets which comprises, as indispensable components, the following (C) alone or two or more of the following (A), (B) and (C), and water, and does not contain a photopolymerization initiator: (A) a polyurethane resin having an elongatedness of dry film of 100% or more (excluding the following (C)) (B) a synthetic resin having at least one ethylenic double bond (excluding the following (C)) (C) a polyurethane resin having an elongatedness of dry film of 100% or more and having at least one ethylenic double bond, and surface-treated metal sheets and a surface-treating method for metal sheets using the composition. The composition can form film having good adhesion of UV-curable paints, UV-curable inks or UV-curable adhesives, in addition to good corrosion resistance, good formability and good durability with injury. The composition may contain (D) a water dispersible wax or (E) water insoluble fine particles having a Mohs hardness of 2.

Abstract: An aluminum alloy heat exchanger resistive to impregnation of tobacco odor includes a base body of an aluminum alloy heat exchanger and an organic hydrophilic coating layer formed on the surface of the heat exchanger base body, and including a component (A) containing a chitosan compound selected from chitosan and derivatives thereof, and a component (B) containing a carboxylic compound having two or more carboxyl groups per molecule thereof, in a total solid amount of the components (A) and (B) of 20% by mass or more, based on the total amount by mass of the organic hydrophilic coating layer.

Abstract: This invention relates to particular aqueous coating compositions comprising particular organic acids and processes of using these compositions to treat plastic moldings.