Coating processes – With post-treatment of coating or coating material – Coating material recirculation or regeneration
Patent
1986-10-27
1988-01-12
Silverberg, Sam
Coating processes
With post-treatment of coating or coating material
Coating material recirculation or regeneration
4274431, 427401, 2041824, C23C 302, C25D 2116
Patent
active
047191287
ABSTRACT:
A forced air, ambient temperature, evaporator coupled to an electroless copper plating bath and to a purification system for replenishing and maintaining the stability of the plating bath, which bath tends to become depleted as the result of the reduction of water soluble cupric salt in an alkaline solution under copper plating and reducing conditions and in which the rate of evaporation of water from the surface thereof is insufficient to preclude growth in the volume thereof resulting from liquid additions thereto required to replace consumed constituents, thus giving rise to a need for bailout to prevent overflow thereof, solves the following problems: evaporation is independent of plating bath geometry; very high evaporation rates enable bailout to be zero at all plating loadings and plating thicknesses; the high evaporation rates provide sufficient cooling whereby the electroless copper solution can be introduced directly to the purification system with no additional cooling; dragout losses may be completely eliminated; and the large amount of air blown through the electroless copper solution of the plating bath enhances stability by lowering the bath temperature, saturating the bath with stabilizing oxygen, and purging the bath of destabilizing waste hydrogen waste product.
REFERENCES:
patent: 4289597 (1981-09-01), Grenda
patent: 4549946 (1985-10-01), Horn
patent: 4600493 (1986-07-01), Korngold
A. G. Tyson, "An Electrochemical Cell for Cadmium Recovery and Recycling," Plating and Surface Finishing, Dec. 1984, pp. 44-47.
Bill Yates, "Atmospheric Evaporators," Plating and Surface Finishing, Apr. 1986, pp. 30-32.
Morton Thiokol Inc.
Silverberg Sam
White Gerald K.
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