US 11,807,943 B2
Aluminum alloy fastening member and method for producing aluminum alloy fastening member
Yuki Urita, Toyama (JP); Atsushi Ogihara, Toyama (JP); Shigeru Tsuchida, Toyama (JP); Chikako Hiromi, Toyama (JP); Ryota Ara, Toyama (JP); Sohei Nagasawa, Kanagawa (JP); Mitsuomi Katori, Kanagawa (JP); and Misako Hosaka, Kanagawa (JP)
Assigned to YKK Corporation, Tokyo (JP)
Filed by YKK CORPORATION, Tokyo (JP)
Filed on Apr. 8, 2020, as Appl. No. 16/843,738.
Claims priority of application No. 2019-115616 (JP), filed on Jun. 21, 2019.
Prior Publication US 2020/0399762 A1, Dec. 24, 2020
Int. Cl. C23C 22/48 (2006.01); C22F 1/05 (2006.01); C22C 21/02 (2006.01); C23C 22/66 (2006.01); C23C 22/73 (2006.01); A44B 19/06 (2006.01); C23C 22/56 (2006.01); C22C 21/08 (2006.01); C22F 1/04 (2006.01); C22F 1/043 (2006.01); C22F 1/047 (2006.01); C22C 21/06 (2006.01); A44B 19/36 (2006.01)
CPC C23C 22/66 (2013.01) [A44B 19/06 (2013.01); C22C 21/08 (2013.01); C23C 22/56 (2013.01); C23C 22/73 (2013.01); A44B 19/36 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An aluminum alloy fastening member comprising:
a chemical conversion coating, the chemical conversion coating containing tellurium as a component element,
wherein the chemical conversion coating of the aluminum alloy fastening member presents a gray color that satisfies color tone ranges of −5≤a*≤8; −3≤b*≤10; and 40≤L*≤75, in a CIELAB color space as defined in JIS Z 8781-4 (2013), and
wherein the chemical conversion coating comprises 10% by mass or more of tellurium and/or a tellurium compound.