| 摘要 |
PURPOSE: To provide a stainproof surface-treated aluminum allay material for outer plate of a noncoated vehicle capable of obtaining a sufficient cleaning effect in the conventional cleaning soln. and cleaning method, particularly in the acidic cleaning soln. and excellent in stainproof properties by forming a specified oxide film on the surface of an aluminum allay material. CONSTITUTION: This aluminum alloy material is the one whose surface has a film constituted of at least one or more kinds among the oxides of Ca, Ba, Mg, Mn, Ni, Co and Zn or at least one or more kinds among the oxides of Ca, Ba, Mg, Mn, Ni, Co and Zn and aluminum oxide and having 0.01 to 5μm film thickness. Moreover, this is the aluminum alloy material whose surface has a film with >=0.01mm film thickness constituted of one or more kinds among the oxides of Ti and Zr or one or more kinds among the oxides of Ti and Zr and aluminum oxide and in which fluorides are contained as F by 1 to 50at% in the film.
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