Fluorocarbon coated magnesium alloy carriage and method of coating a magnesium alloy shaped part
US5156919A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1990 |
| Grant date | Oct 20, 1992 |
| Priority date | — |
| Expiry date | Apr 3, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31699
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnesium alloy structural member for supporting at least one actuator arm in a hard disk drive and a method for making a shaped magnesium part having a fluorocarbon coating is disclosed. The coating is applied by exposing the member to a reactive gas in the presence of a glow discharge plasma to prevent corrosion. The glow discharge is generated by providing a vacuum environment at a pressure of between 250 and 300 millitorr in a reaction chamber and applying power to a pair of electrodes contained within the reaction chamber. Power is supplied at between about 100 and about 200 watts at about 13.6 megahertz, forming a low temperature glow discharge plasma. A reactive gas comprising a fluorinated alkane is introduced to the reaction chamber, and a pressure of between about 100 and about 300 millitorr is maintained. The structural member is exposed to the reactive gas and the plasma for an amount of time sufficient to form a thin and uniform polymeric fluorocarbon coating on the surface of the part. After the coating is formed, the chamber is purged with a hydrocarbon gas to consume any fluorine free radicals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.