SURFACE TREATMENT METHOD OF MAGNETIC METAL POWDER USING STEARIC ACID

摘要

PURPOSE: A method of surface treating magnetic metal powder with stearic acid is provided to improve oxidation resistance of magnetic metal powder suitable for use in magnetic recording media. CONSTITUTION: In a surface treatment method of magnetic metal powder on the surface of which organic film is formed to improve corrosion resistance, the method is characterized in that magnetic metal powder is dipped in an organic solvent in which based on the total weight of magnetic metal powder, 0.5 to 10.0 wt.% of stearic acid is dissolved to form organic film on the surface of magnetic metal powder, and then organic solvent is completely evaporated, wherein the organic solvent is selected from alcohol, toluene and benzene.