US 12,134,805 B2
Aluminum alloy member for forming fluoride film thereon and aluminum alloy member having fluoride film
Isao Murase, Oyama (JP)
Assigned to SHOWA DENKO K.K., Tokyo (JP)
Appl. No. 17/603,843
Filed by SHOWA DENKO K.K., Tokyo (JP)
PCT Filed Mar. 11, 2020, PCT No. PCT/JP2020/010515
§ 371(c)(1), (2) Date Oct. 14, 2021,
PCT Pub. No. WO2020/213307, PCT Pub. Date Oct. 22, 2020.
Claims priority of application No. 2019-77922 (JP), filed on Apr. 16, 2019.
Prior Publication US 2022/0235437 A1, Jul. 28, 2022
Int. Cl. C22C 21/06 (2006.01); C22F 1/04 (2006.01); C23C 14/06 (2006.01); C23C 16/30 (2006.01)
CPC C22C 21/06 (2013.01) [C22F 1/04 (2013.01); C23C 14/06 (2013.01); C23C 16/30 (2013.01)] 3 Claims
OG exemplary drawing
 
1. An aluminum alloy member having a fluoride film thereon,
wherein the fluoride film is formed on at least a part of a surface of the aluminum alloy member wherein the aluminum alloy member consists of:
Si: 0.01 mass % to less than 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<−0.320D+4.60  (1)
is satisfied, and
wherein the fluoride film is composed of a first film layer formed on the surface of the aluminum alloy member for forming a fluoride film thereon and a second film layer formed on a surface of the first film layer,
wherein the first film layer is a film containing a magnesium fluoride, and
wherein the second film layer is a film containing an oxide of aluminum fluoride and aluminum.