METHOD OF PLATING ON A GLASS BASE PLATE, A METHOD OF MANUFACTURING A DISK SUBSTRATE FOR A PERPENDICULAR MAGNETIC RECORDING MEDIUM, A DISK SUBSTRATE FOR A PERPENDICULAR MAGNETIC RECORDING MEDIUM, AND APERPENDICULAR MAGNETIC RECORDING MEDIUM

摘要

AN OBJECT OF THE PRESENT INVENTION IS TO PROVIDE A PLATING METHOD ON A GLASS BASE PLATE. THE METHOD ALLOWS A PLATING FILM TO BE FORMED 5 ON A BASE PLATE COMPOSED OF A GLASS MATERIAL WITH EXCELLENT ADHESIVITY AND HOMOGENEITY BY MEANS OF AN ELECTROLESS PLATING METHOD EVEN TO A THICKNESS OF 1 PM OR MORE. BEFORE FORMING A PLATING FILM BY A STEP OF ELECTROLESS PLATING S8, A SERIES OF SURFACE TREATMENTS ARE CONDUCTED ON THE SURFACE OF THE BASE PLATE COMPOSED OF A GLASS MATERIAL. THE SURFACE TREATMENTS CO MPRISES AT LEAST A STEP OF GLASS ACTIVATION TREATMENT S2, A STEP OF SILANE COUPLING AGENT TREATMENT S3, A STEP OF PALLADIUM CATALYST TREATMENT S4, AND A STEP OF PALLADIUM BONDING TREATMENT S5, A STEP OF ELECTROLESS PLATING S6 TO FORM A PRELIMINARY PLATING FILM HAVING A THICKNESS IN THE RANGE OF 0.02 UM TO 0.5 UM, AND A STEP OF ANNEALING S7 AT A TEMPERATURE IN THE RANGE OF 200'C TO 350'C. SELECTED DRAWING IS FIG. 1.