Acid gold bath for the electroless deposition of gold

Details Acid gold bath for the electroless deposition of gold Acid gold bath for the electroless deposition of gold

1980-07-17

1982-10-05

Hayes, Lorenzo B.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 126, 427437, 4274431, C23C 302

Patent

active

043526900

ABSTRACT:
Stabilized aqueous, acid gold bath, containing a dicyanogold(I)-complex, a complex former, a reducing agent and customary additives, for electroless deposition of gold onto gold and metals that are more electronegative than gold, as well as alloys of these metals, containing a salt of hydroxylamine or a hydroxylamine derivative as reducing agent and a fluoride or hydrogen fluoride as stabilizer. Preferred embodiments include the use of an alkali- or ammonium dicyanoaurate(I) as dicyanogold(I)-complex; using a salt of hydroxylamine or a hydroxylamine derivative of the general formula ##STR1## in which R.sub.1 and R.sub.2 are the same or different and represent hydrogen or alkyl of 1 to 5 carbon atoms and X represents the residue of an inorganic acid, as reducing agent; using an alkali fluoride or an alkali hydrogen fluoride as stabilizer; and a pH-value less than 3, preferably from 0.5 to 2.8.

REFERENCES:
patent: 3032436 (1962-05-01), Gostin et al.
patent: 3300328 (1967-01-01), Luce
patent: 4091128 (1978-05-01), Franz et al.
patent: 4154877 (1979-05-01), Jratny
patent: 4307136 (1981-12-01), Prost-Tournier et al.

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