Patent ID: 6932890
Filing Date: 2005-08-23
Classification: B82Y,C10M,G11B,Y10T

Abstract:
1. A method for making a magnetic recording disk comprising: (a) forming an underlayer on a disk substrate; (b) sputter-depositing a magnetic layer onto the underlayer; (c) sputter-depositing a carbon overcoat onto the magnetic layer, said carbon overcoat having pinholes therein exposing the magnetic layer; and (d) applying to the carbon overcoat a corrosion-protective composition containing a corrosion-protective agent comprised of a metal salt of a perfluorinated polyether having at least one carboxylic acid group, a metal salt of a partially hydrogenated perfluorinated polyether having at least one carboxylic acid group, or a mixture thereof, thereby filling any pinholes in the carbon overcoat with the corrosion-protective composition.