Anodized magnetic thin film aluminium disk with synthetic...

Details Anodized magnetic thin film aluminium disk with synthetic... Anodized magnetic thin film aluminium disk with synthetic...

C - Chemistry, Metallurgy

25

D

117/24.2, 204/22

C25D 11/18 (2006.01) G11B 5/62 (2006.01) G11B 5/73 (2006.01) H01F 10/30 (2006.01)

Patent

CA 1175774

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

372914

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