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Platinum Cobalt Alloy Plating Bath

IP.com Disclosure Number: IPCOM000082268D
Original Publication Date: 1974-Nov-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Barclay, DJ: AUTHOR [+2]

Abstract

Platinum-cobalt films having hard magnetic properties, suitable for use as magnetic recording media, may be deposited from a bath containing platinous tetramine chloride in a concentration of up to 100 gm/1 and cobaltic hexamine chloride in a concentration of up to 2 gm/1. Ammonia is added to keep the pH within the range 9.5 - 10.5, in order to retain the salts in their amine form. Insoluble anodes are used and the plating current density is within the range 10-40 mA/cm/2/. Composition of the bath may be monitored by UV and visible absorption at 320 and 480 nm for platinum and cobalt, respectively.

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Platinum Cobalt Alloy Plating Bath

Platinum-cobalt films having hard magnetic properties, suitable for use as magnetic recording media, may be deposited from a bath containing platinous tetramine chloride in a concentration of up to 100 gm/1 and cobaltic hexamine chloride in a concentration of up to 2 gm/1. Ammonia is added to keep the pH within the range 9.5 - 10.5, in order to retain the salts in their amine form. Insoluble anodes are used and the plating current density is within the range 10- 40 mA/cm/2/. Composition of the bath may be monitored by UV and visible absorption at 320 and 480 nm for platinum and cobalt, respectively.

In known baths, employing platinous dinitrodiammine, side products are formed which limit the useful bath life. In the present bath no side products are formed, and the original bath composition can be maintained by simple replenishment of the salts depleted by plating.

Plating of a 50:50 atomic ratio alloy produces a film with coercivity of around 300 Oe and good corrosion resistance. Composition of the deposit and, in consequence, its magnetic and corrosion resistant properties are dependent on plating current density or plating potential and on the original bath composition.

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