US 12,247,699 B2
High-pressure tank
Kazuhiko Umemoto, Nagakute (JP); Kumi Amano, Nagakute (JP); Tomoyuki Kinjo, Nagakute (JP); Hiroaki Yoneyama, Nagakute (JP); Kazuki Fujii, Toyota (JP); Masayoshi Takami, Toyota (JP); and Chihiro Uchimura, Toyota (JP)
Assigned to KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, Nagakute (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, Nagakute (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Aug. 24, 2022, as Appl. No. 17/894,334.
Claims priority of application No. 2021-140307 (JP), filed on Aug. 30, 2021.
Prior Publication US 2023/0070235 A1, Mar. 9, 2023
Int. Cl. F17C 1/06 (2006.01); C25D 11/04 (2006.01)
CPC F17C 1/06 (2013.01) [C25D 11/04 (2013.01); F17C 2203/012 (2013.01); F17C 2203/0604 (2013.01); F17C 2203/0607 (2013.01); F17C 2203/0646 (2013.01); F17C 2221/012 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A high-pressure tank comprising:
a resin liner for a high-pressure tank including at least one opening portion;
an aluminum mouth portion attached to the opening portion; and
a reinforcement layer formed on an outer surface of the liner, wherein
an aluminum oxide coating is formed on a surface of the aluminum mouth portion,
the aluminum oxide coating includes a porous surface layer in which columns with an average height of 10 to 100 nm are arranged in a dispersed state,
an average value of percentages of the protruding portion area of the columns in randomly sampled 400 nm square visual fields of the porous surface layer is 5.0 to 26.0%, and
an average value of numbers of the columns in randomly sampled 400 nm square visual fields of the porous surface layer is 500 to 2000.