METHOD FOR MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC DISK, AND METHOD FOR MANUFACTURING MAGNETIC DISK

摘要

The present invention provides a method for manufacturing a glass substrate for a magnetic disk in which a highly smooth surface can be obtained after a cleaning process. According to the present invention, in a cleaning process for cleaning by bringing an alkaline cleaning fluid into contact with the surface of a glass substrate after mirror-polishing of the glass substrate, the cleaning fluid contains the organic alkali of general formula (1) below, and the cleaning process is performed while suppressing the content of sodium ions and potassium ions contained in the cleaning fluid. General formula (1): [(R)4N+OH- (R expresses an alkali group, and at least one of the four alkali groups bonding with the N atom contains one or more hydroxyl groups (OH groups).)