| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface treatment method for an aluminum material by which rolling impression, extrusion impressions, or the like, on formation of a stock are eliminated, further, uniformity and reproducibility are made enough in a surface gloss and color tones, and extremely low surface glossiness can be imparted over a wide range. SOLUTION: The low gloss surface treatment method includes: a first stage where the surface of an aluminum material composed of aluminum or an aluminum alloy is degreased; a second stage where oxidation treatment for forming an oxide film is performed; a third stage where acid etching treatment is performed in an acid aqueous solution; and a fourth stage where it is dipped into an alkaline aqueous solution, and is subjected to alkali etching treatment, and the first stage is a non-erosion degreasing stage. The variationΔRa in the surface roughness of the aluminum material before and after the non-erosion degreasing stage is preferably controlled to≤0.05μm. COPYRIGHT: (C)2005,JPO&NCIPI
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