SURFACE WORKING METHOD FOR SUBSTRATE FOR MAGNETIC DISK

摘要

PROBLEM TO BE SOLVED: To finish the surface of a substrate for a magnetic disk so as to have smooth and uniform roughness. SOLUTION: An aqueous acidic solution of a pH below 4 is used as an electrolyte in the surface working method for the substrate for the magnetic disk which simultaneously executes the electrolytic treatment of the substrate surface and the friction cleaning treatment by a cleaning material by rotating the substrate for the magnetic disk having a conductive layer on the surface, electrically conducting an electrode installed to face the substrate and the substrate to each other with the electrolyte, applying voltage between both in this state and bringing the cleaning material into contact with the substrate in this state.