Marlin E Miner

US Patent:

48428868, Jun 27, 1989

Filed:

Nov 4, 1987

Appl. No.:

7/117164

Inventors:

Nathaniel C. Anderson - Pine Island MN
Marlin E. Miner - Dodge Center MN
Lubomyr T. Romankiw - Briarcliff Manor NY
Steven F. Starcke - Rochester MN

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

B05D 118

US Classification:

427 10

Abstract:

The mixed potential of a standard reference electrode and an electrically conductive article that is being electrolessly plated is compared to a DC reference voltage. A predetermined level of comparison indicates the start of electroless plating. This comparison starts a timer. After a predetermined time interval has expired, plating is terminated. The result is a plated coating that is uniform and of a closely controlled thickness. The article to be plated is a thin film magnetic recording disk upon which a thin cobalt containing layer, in the range of about 850 angstroms thick, is to be plated.