Aluminum alloy sheet and manufacturing method thereof

A method for processing an aluminum exterior material, the method comprising:

• processing an aluminum alloy layer into a designated shape;
• and
• performing an anodizing treatment on the processed aluminum alloy layer, the anodizing treatment resulting in an etch-free, sanding-free texturization of the aluminum exterior material, wherein performing the anodizing treatment comprises:
• a first anodizing treatment comprising forming a first film layer on the processed aluminum alloy layer by using a first voltage on the processed aluminum alloy layer, the first anodizing treatment tuned such that the first film layer comprises a reflectivity of about 100 gloss units (GU);
• and
• after performing the first anodizing treatment, a second anodizing treatment comprising forming a second film layer on the processed aluminum alloy layer by using a second voltage greater than the first voltage, the second anodizing treatment held for at least 20 minutes and less than 30 minutes, the second anodizing treatment tuned such that the second film layer comprises a reflectivity of between 60 and 80 GU,
• wherein the second film layer is positioned between the first film layer and the processed aluminum alloy layer and comprises multiple snowflake structures arranged adjacent to the first film layer,
• further comprising polishing the processed aluminum alloy or forming a curved surface, and
• wherein pore sizes of first film pores of the first film layer are greater than pore sizes of second film pores of the second film layer, and the snowflake structures comprise scattered reflection interlayer cracks caused by stress at a film interface between the first film layer and the second film layer resulting from the difference between an expansion value of the first film layer and an expansion value of the second film layer.