Surface-treated aluminum alloy substrates for magnetic disks
US4631112A · kind A · utility
14Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1985 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Apr 18, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/73919
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for treating surfaces of magnetic disk substrates of aluminum alloy with an anodic oxide film on the surfaces thereof, the method comprising: dissolving part of the anodic oxide film by an etching treatment to broaden micro pores of the anodic oxide film to a diameter greater than 170 .ANG..
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.