公开(公告)号：CA1175774A

公开(公告)日：1984-10-09

申请号：CA372914

申请日：1981-03-12

Applicant: IBM

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

IPC: G11B5/66 ,  C09D163/00 ,  G11B5/73 ,  G11B5/738 ,  G11B5/82 ,  G11B5/84 ,  G11B5/85 ,  G11B5/858 ,  H01F10/26 ,  H01F10/30 ,  H01R12/18 ,  C25D11/18 ,  G11B5/62

Abstract: Multi-layer magnetic thin-film disks comprising substrates with aluminum and a synthetic resin layer underneath the matallic magnetic layer are subject to the formation of pin holes in the synthetic resin layer, which pin holes are caused by galvano corrosion of the aluminum of the substrate. The pin holes are passivated by aluminum oxide which is advantageously effected by anodically oxidizing the aluminum of the substrate in an electrolytic bath, the electric voltage of the bath being well below the normal passivation voltage for aluminum. GE9-79-034