Method of preparing hard disc including treatment with amine-containing zincate solution

摘要

A method of preparing a hard disc comprising steps of: immersing an aluminum or aluminum alloy substrate in a zincate solution containing a zinc compound, an alkali hydroxide, and at least one amine to thereby form a zincate film on the surface of the substrate, immersing the zincate film-formed substrate in an electroless nickel plating solution comprising a water-soluble nickel salt, a complexing agent, and a hypophosphite to thereby form a nickel-phosphorus alloy layer on the surface of the zincate film-coated substrate, and forming a magnetic layer on the nickel-phosphorus alloy layer.