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 1 and R 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.
In a stabilized aqueous, acidic gold plating bath for the electroless deposition of gold on gold and metals that are more electronegative than gold and alloys thereof containing a dicyanogold(I)-complex, a complex former and a reducing agent; the improvement comprising a stabilizer selected form the group consisting of an alkali metal fluoride and an alkali metal hydrogen fluoride and, as reducing agent, a hydroxyl amine derivative having the formula ##STR4## in which R 1 and R 2 are the same or different and represent hydrogen or alkyl of 1-5 carbon atoms and X represents the residue of an inorganic acid.
Claim 2
Dependent Claim
100 words
In a stabilized aqueous, acidic gold plating bath for the electroless deposition of gold on gold and metals that are more electronegative than gold and alloys thereof containing a dicyanogold(I)-complex, a complex former and a reducing agent; the improvement comprising a stabilizer selected form the group consisting of an alkali metal fluoride and an alkali metal hydrogen fluoride and, as reducing agent, a hydroxyl amine derivative having the formula ##STR4## in which R 1 and R 2 are the same or different and represent hydrogen or alkyl of 1-5 carbon atoms and X represents the residue of an inorganic acid.
Claim 3
Dependent Claim
17 words
The gold bath according to claim 1, containing an alkali metal- or ammonium dicyanoaurate(I) as said dicyanogold(I)-complex.
Claim 4
Dependent Claim
22 words
The gold bath according to claim 1, wherein said inorganic acid is selected from the group consisting of hydrochloric and sulfuric acid.
Claim 5
Dependent Claim
20 words
The gold bath according to claim 1, further comprising an alkali metal chloride, an alkali metal bromide or mixtures thereof.
Claim 6
Dependent Claim
12 words
The gold bath according to claim 4, further comprising unsaturated carbonic acids.
Claim 7
Dependent Claim
14 words
The gold bath according to claim 1, wherein the pH-value is less than 3.
Claim 8
Dependent Claim
16 words
The gold bath according to claim 6, wherein said pH-value is between about 0.5 and 2.8.