| 摘要 |
PURPOSE:To produce a member for a heat exchanger having excellent heat resistance and corrosion resistance by coating a soln. mixture composed of alkyl imidazole, acid, water, and org. solvent on the surface of copper or copper alloy and subjecting the coating to a specific heating treatment. CONSTITUTION:The soln. mixture composed of the alkyl imidazole, the acid, the water and the org. solvent is coated on the surface of the copper or copper alloy. The above-mentioned alkyl imidazole which has a long chain alkyl group is more preferable. The alkyl imidazole dissolves in the acid soln. and forms a monomolecular film as a complex on the copper surface activated by the aid. Further, the alkyl imidazole dissolved in the org. solvent grows the film by a hydrogen bond on this monomolecular film. Hydrochloric acid, sulfuric acid, etc., are used for the above-mentioned acid and the org. solvent is adequately methanol, acetone, etc. The coated film is subjected to the heating treatment to hold the copper or copper alloy for 20sec-5min at 200-360 deg.C after formation of said film. The member for heat exchanger fins which has the rust preventive film resistant to breakage at the time of soldering and has the excellent heat resistance and corrosion preventiveness is thereby obtd. |
