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Controlling Magnetic Characteristics Of Electroplated Recording Tape By Means Of Contract Type

IP.com Disclosure Number: IPCOM000095448D
Original Publication Date: 1964-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 53K

Publishing Venue

IBM

Related People

Polleys, RW: AUTHOR [+2]

Abstract

Electroplating is one process of producing cobalt-nickel-phosphorous films having magnetic properties suitable for recording purposes. The electroplating apparatus illustrates a procedure by which the magnetic properties of a continuous electroplated film are controlled. This is by adjusting the proportion of current fed to certain of the electroplating contacts without changing the plating solution composition or conditions of temperature and pH.

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Controlling Magnetic Characteristics Of Electroplated Recording Tape By Means Of Contract Type

Electroplating is one process of producing cobalt-nickel-phosphorous films having magnetic properties suitable for recording purposes. The electroplating apparatus illustrates a procedure by which the magnetic properties of a continuous electroplated film are controlled. This is by adjusting the proportion of current fed to certain of the electroplating contacts without changing the plating solution composition or conditions of temperature and pH.

A plurality of fluid cathodic contacts 10 is partially submerged in plating bath 12 supported in insulating container 13. The path taken by the continuous, high resistance substrate 11, having a conductive surface and being plated, is through the series of liquid contacts 10 with intervening dips into electroplating bath
12. Substrate 11 is supported in its path by a plurality of rollers
14. Each cathodic contact 10 includes a liquid mercury body 15 in a container 16. The body of mercury is covered by a layer of water 17. Current carrying plate 19 is located within the body of mercury 15. Pairs of anodes 18 are positioned in the electroplating baths in the immediate area in which continuous substrate 11 enters or leaves electroplating bath 12. A series of rheostats 20 allows the adjustment of current from the current source 21 to each of the pairs of anodes. The amount of electroplating in the area of each pair of anodes 18 is thus controlled by its associated rheostat 20.

When the continuous substrate leaves the first cathodic contact 10 on its way to bath 12, it is carrying electric current received within cathodic contact 10. The current path is from the positive terminal of source 21 through the lead to the first pair of anodes 18 through bath 12, through the conductive surface of substrate 11, into the cathodic contact 10 and back to the other side of current source 21. Electroplating occurs only in the cross-hatched area surrounding the continu...