Information storage device having coated metal hub

Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier

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428 653, 428694ST, 428694SG, 428694TR, 428694TM, 428900, 427128, 427129, 427130, 360133, 360135, 205 90, 205119, 205217, G11B 566

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061467359

ABSTRACT:
A mini-floppy disk or like information storage device is comprised of a circle of data storage medium having a central metal hub. In use, the hub is contacted with and driven by a magnetized spindle. The hub comprises a ferromagnetic substrate and a metal coating. The coating has magnetization B.sub.s which is less than the magnetization of the substrate. The coating is harder than the substrate, preferably greater than 400 DPH hardness number. The coating is deposited with an amorphous microstructure while the substrate is crystalline. The coating has a nodular surface texture and surface oxide film which provides improved adhesive bond strength, where the medium is joined to the hub. The coating preferably is an electroless plating deposit, comprised of nickel or cobalt base metal, with phosphorous or boron additive; most preferably it is nickel-11% phosphorous.

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W. Riedel "Electroless Nickel Plating" ASM International (1991) pp. 1-159; 204-220; 261-281.
V.G. Shawnan et al. "Chemisch-Nickel Richtig Einsetzen," Galvinotechnik V. 73 N. 3 Mar. 1986, pp. 550-560.
J. Hajdu et al. "Comparison of Electroless Deposits for Electro-Magnetic Interference Shielding" Plating & Surface Finishing; pp. 42-44; (Jul. 1983).

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