Electroless gold plating bath

Details Electroless gold plating bath Electroless gold plating bath

1976-10-08

1978-05-23

Kendall, Ralph S.

Coating processes

With pretreatment of the base

Preapplied reactant or reaction promoter or hardener

427168, 427426, 106 126, 427430A, C23C 302

Patent

active

040911284

ABSTRACT:
A method for preparing an electroless gold plating bath comprising a gold salt and a complexing agent is improved by adding the gold salt as a concentrated solution to a concentrated solution of the complexing agent either maintained at or subsequently heated to above ambient temperature in order to eliminate the step of aging the plating bath. The plating efficiency of an electroless gold plating bath comprising a gold salt and an alkali carbonate complexing agent and the quality of the resulting gold film are improved by buffering the bath with an alkali metal bicarbonate thus maintaining a pH between about 8.5 to about 9.5.

REFERENCES:
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patent: 2969295 (1961-01-01), Crishal et al.
patent: 3032436 (1962-05-01), Gostin
patent: 3266929 (1966-08-01), Lareau et al.
patent: 3300328 (1967-01-01), Luce
patent: 3396042 (1968-08-01), Duva
patent: 3484263 (1969-12-01), Kushihashi et al.
patent: 3515571 (1970-06-01), Levy
patent: 3589916 (1971-06-01), McCormack
patent: 3697296 (1972-10-01), Bellis
patent: 4005229 (1977-01-01), Miller et al.

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