Aluminum alloy plate for magnetic disk, aluminum alloy blank for magnetic disk, and aluminum alloy substrate for magnetic disk

A technology for aluminum alloy plates and magnetic disks, applied in the direction of disk-shaped carrier, magnetic recording, magnetic recording layer, etc., can solve the problem of inability to form films, and achieve the effect of excellent yield strength

Inactive Publication Date: 2016-02-10
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, Ni-P coating film cannot be formed in this part, and gas pits are formed

Method used

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  • Aluminum alloy plate for magnetic disk, aluminum alloy blank for magnetic disk, and aluminum alloy substrate for magnetic disk
  • Aluminum alloy plate for magnetic disk, aluminum alloy blank for magnetic disk, and aluminum alloy substrate for magnetic disk

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Embodiment

[0120] Next, the contents of the present invention will be specifically described with reference to Examples that exhibit the effects of the present invention and Comparative Examples that do not.

[0121] First, the material was melted at 700° C., the components were adjusted so as to have the chemical compositions shown in No. 1 to 24 in Table 1, and ingots were cast at the casting temperatures shown in Table 1. Next, surface cutting was performed to remove the segregation layer on the surface of the ingot, and a homogenization heat treatment was performed at 540° C. for 8 hours. Thereafter, hot rolling was immediately performed to produce a hot-rolled sheet having a thickness of 3 mm. Then, this hot-rolled sheet was cold-rolled to manufacture a cold-rolled sheet having a thickness of 1.0 mm.

[0122] This cold-rolled sheet (Al alloy sheet) was punched into a ring shape with an outer diameter of 95 mm and an inner diameter of 25 mm, stacked 20 sheets, annealed at 320°C for ...

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Abstract

An aluminum alloy plate for a magnetic disk, according to the present invention, is characterized in: containing 3.5 to 5.5 percent by mass of Mg; restricting Fe to less than or equal to 0.025 percent by mass; restricting Si to less than or equal to 0.020 percent by mass; containing 0.010 to 0.20 percent by mass of Cr; containing 0.010 to 0.1 percent by mass of Cu and/or 0.05 to 0.4 percent by mass of Zn; additionally restricting Mn to less than or equal to 0.005 percent by mass and Ni to less than or equal to 0.001 percent by mass; the balance being Al and incidental impurities; the elemental composition ratio of Mn to Fe within an Al-Fe-Mn-based intermetallic compound being less than or equal to 0.50; the elemental composition ratio of Ni to Fe within an Al-Fe-Ni-based intermetallic compound being less than or equal to 0.20; and the absolute maximum length of an Al-Fe-based intermetallic compound being less than or equal to 10 [mu]m. Therefore, for the aluminum alloy plate for a magnetic disk, micro-plating defects are less likely to occur even if acid etching processing for plating pre-treatment is performed using weak conditions.

Description

technical field [0001] The invention relates to an aluminum alloy plate for a magnetic disk, an aluminum alloy body for a magnetic disk and an aluminum alloy substrate for a magnetic disk. Background technique [0002] A magnetic disk used as a recording medium of a computer or the like is formed by forming a magnetic film on a non-magnetic substrate. In general, light weight, high rigidity, and a smooth surface are required for the substrate, so a 5086 alloy (Al—Mg-based alloy) specified in JISH4000:2006 is used. [0003] For the substrate, after using the alloy to manufacture a plate, for example, the surface of the plate is sequentially subjected to mirror finishing, degreasing treatment, acid etching treatment, black film peeling treatment, first zincate treatment, and nitric acid stripping. treatment, the second zincate treatment, electroless Ni-P plating treatment. Then, a magnetic film and the like are formed on the electroless Ni-P plated film to manufacture a magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/06G11B5/73G11B5/82C22F1/047C23C18/32
CPCC22C21/06C22F1/047C23C18/32G11B5/82G11B5/73919
Inventor 寺田佳织梅田秀俊
Owner KOBE STEEL LTD
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