Coating processes – Measuring – testing – or indicating – Thickness or uniformity of thickness determined
Patent
1987-11-04
1989-06-27
Pianalto, Bernard
Coating processes
Measuring, testing, or indicating
Thickness or uniformity of thickness determined
427130, 427131, 427437, 428693, 428694, 428900, 428928, B05D 118
Patent
active
048428868
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.
REFERENCES:
patent: 4626446 (1986-12-01), Capwell et al.
Anderson Nathaniel C.
Miner Marlin E.
Romankiw Lubomyr T.
Starcke Steven F.
International Business Machines - Corporation
Lahtinen Robert W.
Pianalto Bernard
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