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AssigneeNational Science Council
InventorsJing-Chie Lin, Jiann-Gow Her, Shyh-Biau Jiang, Chiang-Nan Chang, Jyh-Rurng Your
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A cobalt-chromium (Co-Cr) magnetic film electrodeposited on the surface of an aluminum alloy. A process for making an aluminum alloy electrodeposited a cobalt-chromium (Co-Cr) magnetic film comprises the steps of chemically polishing an aluminum alloy substrate, pretreating either with phosphate or with zincate and electrodepositing in a plating bath containing cobalt and chromium ions to prepare the cobalt-chromium thin film on the aluminum alloy. Chromium content in the film can be designed by adjusting the parameters of pretreatment and electroplating. The produced cobalt-chromium film can flexibly adjust the magnetic characteristics (e.g. coercive force (Hc) and ramanence magnetization (Mr)) and is suitable for use in a magnetic recorder. The chemical composition, adhesion, microhardness, magnetic properties of the deposits indicate that the Co-Cr films produced are satisfactory for magnetic recording service.
An aluminum alloy cobalt-chromium magnetic recording film, comprising an aluminum alloy as a substrate, and a cobalt-chromium magnetic recording film electrodeposited on the substrate, the magnetic recording film having a chromium content of between 4-12 wt %, the chromium content being achieved by chemical polishing and phosphate pretreatment of the aluminum alloy, followed by electrodepositing in a plating bath containing cobalt and chromium, wherein magnetic characteristics of the cobalt-chromium magnetic recording film is flexibly adjusted according to cobalt-chromium ratios of the magnetic film.
An aluminum alloy cobalt-chromium magnetic recording film, comprising an aluminum alloy as a substrate, and a cobalt-chromium magnetic recording film electrodeposited on the substrate, the magnetic recording film having a chromium content of between 0.8-1.6 wt %, the chromium content being achieved by chemical polishing and zincate-diping pretreatment of the aluminum alloy, followed by electrodepositing in a plating bath containing cobalt and chromium, wherein magnetic characteristics of the cobalt-chromium magnetic recording film is flexibly adjusted according to cobalt-chromium ratios of the magnetic film.
Dependencies are inferred from the claim text.