Method and apparatus for controlling the surface chemistry on ob

Details Method and apparatus for controlling the surface chemistry on ob Method and apparatus for controlling the surface chemistry on ob

1986-04-21

1987-09-08

Smith, John D.

Coating processes

Measuring, testing, or indicating

427 9, 427 10, 427345, 4271431, C23C 302

Patent

active

046923462

ABSTRACT:
A method and apparatus for controlling surface chemistry on objects plated in an electroless plating bath. Cyclic voltammetry measurements are made for different pH conditions of the bath. Pourbaix diagrams are determined from these measurements which indicate the transition between metal species being plated by the bath. The open circuit potential of the bath is monitored by a potentiostat and compared with a setpoint open circuit potential which represents a desired metal species on the pourbaix diagram. The monitored open circuit potential and the setpoint are utilized to derive an error voltage. The error voltage will control the concentration of a chemical constitutent of the plating bath to maintain the desired method species on the plating surface.

REFERENCES:
patent: 4331699 (1982-05-01), Suzuki
patent: 4623554 (1986-11-01), Kaschak
patent: 4626446 (1986-12-01), Capwell

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