| 摘要 |
PURPOSE:To prevent adsorption of a press oil during washing of a material and to get a good hydrophilic property by forming an inorganic film having a good wettability on the surface of Al material and including an inorganic phosphoric compound in the surface of the inorganic film. CONSTITUTION:After the inorganic film having a good wettability is formed on the surface of Al or Al alloy material, the inorganic film is treated by an inorganic phosphoric acid solution and is dried to make the compound to be included in the surface of the inorganic film. Then, a specified forming work is performed and formed components are assembled. Thus, a heat exchanger is manufactured with a good working efficiency and at a less expense.
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