TWI851684B

An aluminum alloy member forms a fluoride film thereon, which does not form a black dot-shaped bulged portion and, therefore, has excellent smoothness and excellent corrosion resistance against a corrosive gas, plasma, and others. An aluminum alloy member for forming a fluoride film thereon, consists of: Si: 0.01 mass % to 0.3 mass %; Mg: 0.5 mass % to 5.0 mass %; Fe: 0.05 mass % to 0.5 mass %; Cu: 0.5 mass % or less; Mn: 0.30 mass % or less; Cr: 0.30 mass % or less, and the balance being Al and inevitable impurities, wherein when an average major diameter of Fe-based crystallized products in the aluminum alloy member is "D" (μm), and an average crystalline particle diameter in the aluminum alloy member is "Y" (μm), a relational expression: Log10 Y