公开(公告)号：US20200377984A1

公开(公告)日：2020-12-03

申请号：US16488826

申请日：2018-02-09

Applicant: UACJ CORPORATION ,  FURUKAWA ELECTRIC CO., LTD.

Inventor： Kotaro KITAWAKI ,  Takuya MURATA ,  Makoto YONEMITSU ,  Kouichiro TAKIGUCHI ,  Takashi NAKAYAMA ,  Kimie IMAKAWA ,  Yasuo FUJII ,  Hideyuki HATAKEYAMA

IPC: C22F1/04 ,  C22C21/00 ,  G11B5/73 ,  G11B5/858

Abstract: Provided are: an aluminum alloy substrate for a magnetic disk, including an aluminum alloy including 0.4 to 3.0 mass % of Fe with the balance of Al and unavoidable impurities; a method for producing the aluminum alloy substrate for a magnetic disk; and a magnetic disk in which an electroless Ni—P plating treatment layer and a magnetic layer formed thereon are disposed on a surface of the aluminum alloy substrate for a magnetic disk.

公开(公告)号：US20180190316A1

公开(公告)日：2018-07-05

申请号：US15570751

申请日：2016-05-23

Applicant: UACJ Corporation ,  Furukawa Electric Co., Ltd.

Inventor： Kotaro KITAWAKI ,  Takuya MURATA ,  Akira HIBINO ,  Naoki KITAMURA ,  Masanobu ONISHI ,  Hideki TAKAHASHI ,  Satoshi YAMAZAKI ,  Sadayuki TODA

IPC: G11B5/65 ,  G11B5/858 ,  C22C21/06 ,  C22F1/047

Abstract: The present invention provides: an aluminum alloy substrate for magnetic discs with excellent plating surface smoothness; a manufacturing method therefor; and a magnetic disc using said aluminum alloy substrate for magnetic discs. The present invention is an aluminum alloy substrate for magnetic discs, a manufacturing method therefor, and a magnetic disc using said aluminum alloy substrate for magnetic discs, the aluminum alloy substrate being characterized in being obtained from an aluminum alloy containing Mg: 2.0-8.0 mass % (“%” below), Be: 0.00001-0.00200%, Cu: 0.003-0.150%, Zn: 0.05-0.60%, Cr: 0.010-0.300%, Si: 0.060% or less, Fe: 0.060% or less, the balance being obtained from Al and unavoidable impurities.