Method for producing magnetic disk substrates
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United States of America Patent
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Apr 30, 2002
Grant Date -
N/A
app pub date -
Aug 30, 1999
filing date -
Aug 31, 1998
priority date (Note) -
Expired
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Abstract
Magnetic disk substrates are produced by subjecting glass substrates to at least steps of degreasing, etching, sensitization with tin chloride, activation and sensitivity-enhancing treatment in that order, then plating the pretreated substrates with a nickel/phosphorus film, and thereafter polishing the plated substrates. In the process, the substrates being processed are washed with hot pure water at a temperature of not lower than 50.degree. C. for a period of from 20 to 90 seconds, after the sensitization step but before the activation step, and heated at a temperature of not lower than 70.degree. C. for a period of from 5 to 100 minutes, after the sensitization step but before the nickel/phosphorus-plating step.
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