| 摘要 |
PROBLEM TO BE SOLVED: To provide an anode oxidation treatment method of an aluminum-based material having high adiabaticity and high anticorrosion, and high durability and impact resistance, as well as high water repellent and oil repellent functions, and to provide an internal combustion engine structure.SOLUTION: The anode oxidation treatment method comprises: a step for applying superimposed alternating electrolysis to an aluminum-based material 1 for forming a second anode oxidation coating 2b; and a step for, sequentially, applying direct electrolysis to the aluminum-based material 1 for forming a first anode oxidation coating 2a. The second anode oxidation coating 2b is formed on the first anode oxidation coating 2a. |
