A polishing composition for finish polishing of a Ni-P plated aluminum magnetic disk substrate, a method for polishing an Ni-P plated aluminum magnetic disk substrate, a method for producing a Ni-P plated aluminum magnetic disk substrate, and a Ni-P Plated aluminum magnetic disk substrate

摘要

PROBLEM TO BE SOLVED: To provide a finish polishing abrasive composition capable of reducing the scratches of a substrate after polishing, and also to provide a method for polishing a magnetic disk substrate using the finish polishing abrasive composition, a method for producing a magnetic disk substrate using the finish polishing abrasive composition, and a magnetic disk substrate.SOLUTION: The finish polishing abrasive composition comprises abrasive material, acid, oxidizer, scratch reducing agent that reduces scratch, and water. The scratch reducing agent is a sulfonic acid-based anionic surfactant and/or sulfuric acid ester-based anionic surfactant, and the anionic surfactants have amide structures.