Apparatus and method for automatically maintaining an electroles

Details Apparatus and method for automatically maintaining an electroles Apparatus and method for automatically maintaining an electroles

1976-02-19

1978-06-20

Gwinnell, Harry J.

Coating processes

Immersion or partial immersion

23230A, 23253A, 118 7, 427437, B05D 140, B05D 312

Patent

active

040963012

ABSTRACT:
Apparatus and a method are disclosed for replenishing an electroless plating bath with those of its components which are consumed during plating operation, in order that the concentration of components be maintained as nearly constant as possible in the working bath. The system involves withdrawing from the bath a small sample stream at fixed rate, and subjecting this automatically to a sequence of analyses. The system is particularly adapted to control of electroless copper solutions comprising copper ion, hydroxide and formaldehyde as the consumable components. Sequential analyses are made of the sample stream for these components using instrumentation to control actuators which introduce replenisher solutions into the plating tank in response to signals generated by the instruments whenever deviation occurs from a pre-set level. Standardized test solutions of known concentration and rate of feed are introduced into the test stream to optomize test conditions during the analyses. Changes in bath composition occurring during normal plating operations thus provide changes in instrument readings which are analogs of the concentration of the respective components and signals produced by such readings serve to activate the respective replenisher solution feed controls.

REFERENCES:
patent: 2872353 (1959-02-01), Methery
patent: 3326700 (1967-06-01), Zeblisky
patent: 3532519 (1970-10-01), Hirohata et al.
patent: 3934054 (1976-01-01), Schmeling et al.
patent: 3951602 (1976-04-01), Thompson
patent: 3959531 (1976-05-01), Schneble et al.

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