公开(公告)号：DE3162204D1

公开(公告)日：1984-03-22

申请号：DE3162204

申请日：1981-03-12

Applicant: IBM

Inventor： KIENLE HELMUT ,  SCHMID GERHARD E DR ,  STEINER WERNER ,  TRIPPEL GERHARD DR

IPC: G11B5/66 ,  C09D163/00 ,  G11B5/73 ,  G11B5/738 ,  G11B5/82 ,  G11B5/84 ,  G11B5/85 ,  G11B5/858 ,  H01F10/26 ,  H01F10/30 ,  H01R12/18

Abstract: Multi-layer magnetic thin film disks comprising a synthetic resin layer on an aluminum-containing substrate and an overlying metallic magnetic layer, are liable to have pin holes in the synthetic resin layer caused by galvanic corrosion of the aluminum in the substrate. The pin holes are passivated by aluminum oxide produced therein by anodically oxidizing the aluminum of the substrate in an electrolytic bath, the electric voltage of which is well below the normal passivation voltage for aluminum.