Patent ID: 6378338
Filing Date: 2002-04-30
Classification: C03C,C23C,G11B

Abstract:
A method for producing magnetic disk substrates, which comprises subjecting glass substrates to at least steps of degreasing, etching, sensitization with tin chloride, activation and sensitivity-enhancing treatment in that order, then pretreated substrates with a nickel/phosphorus film, and thereafter polishing the plated substrates,the substrates being processed are washed with hot pure water at a temperature of not lower than 50Â° C. for a period of from 20 to 90 seconds, after the sensitization step but before the activation step, and the substrated being heated at a temperature of not lower than 70Â° C. for a period of from 5 to 100 minutes, after the sensitization step but before the nickel/phosphorus-plating step.