IMPROVEMENT OF CORROSION RESISTANCE IN ELECTROLESS NI-P PLATING SUBSTRATE FOR MAGNETIC DISK

摘要

PURPOSE:To provide superior corrosion resistance to an Al-alloy substrate, by applying electroless Ni-P plating to an Al-alloy substrate and then subjecting the substrate to heat treatment at a specific temp. CONSTITUTION:After electroless Ni-P plating is applied to the Al-alloy substrate for magnetic disk, heating is applied to the substrate with a frequency of at least once or more at a temp. in the range between 100 deg.C and the magnetic transition temp. of this plating layer or below, preferably at about 150-250 deg.C, the about 30-60min. In this way, excellent corrosion corrosion resistance can be provided without causing occurrences of blister, peeling, etc., to the undercoat Ni-P plating layer and deterioration in film characteristics.