Apparatus for controlling electroless plating bath

Details Apparatus for controlling electroless plating bath Apparatus for controlling electroless plating bath

1982-02-26

1983-09-27

Silverberg, Sam

Coating apparatus

Control means responsive to a randomly occurring sensed...

Responsive to condition of coating material

B05D 140, B05D 312

Patent

active

044062494

ABSTRACT:
A method and an apparatus for controlling the content of an electroless plating bath such as an electroless nickel plating bath such that the bath is usable for an extended period of time without remaking are disclosed. The method comprises the steps of:
continuously or intermittently measuring the concentration of at least one consumable ingredient of the electroless plating bath, and
automatically adding to the plating bath a first replenishing composition essentially consisting of the consumable ingredient after detecting that the measured value has reached a predetermined concentration; while
continuously or intermittently measuring one physical property of the electroless plating bath to determine the degree of aging of the bath, and
automatically discharging a predetermined volume of the plating solution and automatically adding to the plating bath a second replenishing composition containing unconsumable ingredients in an amount essentially corresponding to the lost amount by the discharging after detecting that the measured value has reached a predetermined value of the physical property.

REFERENCES:
patent: 4096301 (1978-07-01), Slominski
patent: 4152164 (1979-05-01), Gulla

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