Patent EP0150439A1 successfully refreshed from Google Patents.
EP0150439A1
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EP
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An acid bath for electrodeposition of gold or gold alloys, an electroplating method and the use of said bath
Assignee: Rohm and Haas Electronic Materials Holdings UK Ltd
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Filing: 1984-12-19
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Granted: —
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Expires: 2004-12-19
Abstract
Abstract An aqueous acid bath for electrodeposition of gold and gold alloys is described, which comprises besides gold in solution as a water soluble compound, optionally an alloying metal as a salt or chelate, and at least one electrolyte, as a further additive a sufficient amount of a substituted pyridine compound preferably selected from the group consisting of pyridine carboxylic acids, pyridine sulphonic acids, pyridine thiols, and derivatives thereof, or a quinoline derivative. There is also disclosed an electroplating method as well as the use of said acid bath.
Inventors
- 👤 Keith John Whitlaw
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 21:09
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/62; C25D3/48
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
43 words
An aqueous acid bath for electrodeposition of gold and gold alloys comprising: gold in solution as a water soluble compound; and at least one electrolyte, characterised by the inclusion a compound selected from the group consisting of substituted pyridine compounds and quinoline derivatives.
Claim 2
Dependent Claim
43 words
An aqueous acid bath for electrodeposition of gold and gold alloys comprising: gold in solution as a water soluble compound; and at least one electrolyte, characterised by the inclusion a compound selected from the group consisting of substituted pyridine compounds and quinoline derivatives.
Claim 3
Dependent Claim
32 words
A bath according to claim 1 characterised in that said compound is a pyridine compound selected from the group consisting of pyridine carboxylic acids, pyridine sulphonic acids, pyridyl thiols, and derivatives thereof.
Claim 4
Dependent Claim
30 words
A bath according to claim 2, characterised in that said pyridine compound is a mono- or dicarboxylic acid, mono- or disulphonic acid, or a mono- or dithiol derivative of pyridine.
Claim 5
Dependent Claim
28 words
A bath according to any one of claims 1 to 3, characterised in that said compound is a pyridine compound substituted in the 3-position of the pyridine ring.
Claim 6
Dependent Claim
26 words
A bath according to claim 2, characterised in that said pyridine compound is an amide or ester of a pyridine carboxylic acid or pyridine sulphonic acid.
Claim 7
Dependent Claim
25 words
A bath according to claim 2, characterised in that said pyridine compound is a derivative of a pyridine thiol substituted by a carboxylic acid group.
Claim 8
Dependent Claim
32 words
A bath according to claim 2, characterised in that the pyridine compound is nicotinic acid, nicotinic acid methyl ester, nicotinamide, nicotinic acid diethylamide, pyridine-2,3-dicarboxylic acid, pyridine-3,4-dicarboxylic acid, pyridine-3-sulphonic acid or pyridyl-4-thio-acetic acid.
Claim 9
Dependent Claim
29 words
A bath according to claim 1, characterised in that said compound is a quinoline derivative selected from the group consisting of 3-quinoline carboxylic acid, 3-quinoline carboxaldehyde, and 2,4-quinoline diol.
Claim 10
Dependent Claim
45 words
A bath according to any one of the preceding claims characterised in that said soluble gold compound is a gold cyanide with the inclusion of at least one buffering, chelating or complexing compound and that the pH lies in the range from 3 to 5.
Claim 11
Dependent Claim
30 words
A bath according to any one of the preceding claims, characterised in that the concentration of the pyridine or quinoline compound is in the range from 1 to 10 g/l.
Claim 12
Dependent Claim
25 words
A bath according to claim 10, characterised in that-the concentration of the pyridine or quinoline compound is in the range from 4 to 6 g/1.
Claim 13
Dependent Claim
15 words
A bath according to claim 11, characterised in that said concentration is substantially 4.5 g/1.
Claim 14
Dependent Claim
28 words
A bath according to any one of the preceding claims characterised by the inclusion of an alloying metal, said alloying metal being added as a salt or chelate.
Claim 15
Dependent Claim
27 words
A bath according to claim 13, characterised in that the bath is a nickel-hardened, an iron-hardened, a cobalt-hardened, a gold/nickel/indium bath or a gold/cobalt/indium gold plating bath.
Claim 16
Independent Claim
51 words
A method of electroplating gold or gold alloy to form a bright hard deposit, using a plating bath comprising gold in solution as a water soluble compound, and at least one electrolyte characterised by the inclusion of a compound selected from the group consisting of substituted pyridine compounds and quinoline derivatives.
Claim 17
Independent Claim
51 words
A method of electroplating gold or gold alloy to form a bright hard deposit, using a plating bath comprising gold in solution as a water soluble compound, and at least one electrolyte characterised by the inclusion of a compound selected from the group consisting of substituted pyridine compounds and quinoline derivatives.
Claim 18
Dependent Claim
32 words
A method according to claim 15 characterised in that said compound is a pyridine compound selected from the group consisting of pyridine carboxylic acids, pyridine sulphonic acids, pyridine thiols, and derivatives thereof.
Claim 19
Dependent Claim
29 words
A method according to claim 15, characterised in that said compound is a quinoline derivative selected from the group consisting of 3-quinoline carboxylic acid, 3-quinoline carboxaldehyde, and 2,4-quinoline diol.
Claim 20
Independent Claim
28 words
A method according to claims 15 to 17, characterised in that the plating process is carried out at a current density from 25 to 100 amps/dm 2 .
Claim 21
Dependent Claim
28 words
The use of the acid bath according to any one of claims 1 to 14 for the plating of printed circuit board edge tabs, or for connector applications.
Claim 22
Dependent Claim
74 words
An aqueous acidic bath for electrodeposition of gold alloys comprising a solution of a soluble gold cyanide, at least one conducting, buffering, chelating or complexing compound, at least one alloying metal in soluble form taken from the group of cobalt, nickel and iron, characterised by the inclusion of sufficient amount of a compound selected from the group consisting of substituted pyridine compounds and quinoline derivatives capable of increasing the deposition rate of the bath.
Claim 23
Dependent Claim
74 words
An aqueous acidic bath for electrodeposition of gold alloys comprising a solution of a soluble gold cyanide, at least one conducting, buffering, chelating or complexing compound, at least one alloying metal in soluble form taken from the group of cobalt, nickel and iron, characterised by the inclusion of sufficient amount of a compound selected from the group consisting of substituted pyridine compounds and quinoline derivatives capable of increasing the deposition rate of the bath.
References Cited (Backward Citations)
US3929595A
Cited
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