ANODIC OXIDATION OF MAGNETIC DISK SUBSTRATE MADE OF TITANIUM

PURPOSE:To provide a method for anodically oxidizing a magnetic disk substrate made of titanium by which an anodic oxide film excellent in adhesion to the titanium substrate and having low surface roughness is formed. CONSTITUTION:A magnetic disk substrate made of titanium and a cathode material are...

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Bibliographic Details
Main Authors SUENAGA HIROYOSHI, OMURA MASAKI, IDA IWAO, NAGASHIMA HITOSHI
Format Patent
LanguageEnglish
Published 23.08.1994
Edition5
Subjects
APPARATUS THEREFOR
CHEMISTRY
ELECTROFORMING
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
METALLURGY
PHYSICS
PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS
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Summary:PURPOSE:To provide a method for anodically oxidizing a magnetic disk substrate made of titanium by which an anodic oxide film excellent in adhesion to the titanium substrate and having low surface roughness is formed. CONSTITUTION:A magnetic disk substrate made of titanium and a cathode material are prepared and immersed at an interval in an aq. electrolytic soln. contg. fluorine at a prescribed concn. and one or more among chlorine, bromine and iodine at a prescribed concn. as halogen elements. The disk substrate is anodically oxidized by impressing a prescribed DC voltage and the anodically oxidized disk substrate is anodically oxidized again in an acidic electrolytic soln.
Bibliography:Application Number: JP19930023980