US4545869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bath and process for high speed electroplating of palladium
Assignee: OMI International Corp
•
Filing: 1985-01-29
•
Granted: 1985-10-08
•
Expires: 2005-01-29
Abstract
Abstract A palladium electroplating bath capable of plating highly ductile palladium metal. The bath comprises a palladium amine complex salt as a source of the palladium metal, ammonium sulfate, an ammonium halide, an alkali metal pyrophosphate, a stress reducing agent, and a minor amount of cyanide ions. In general, the cyanide ions are furnished to the bath by the addition of alkali metal cyanide. The pH of the bath will range from about 7 to 9. Electrolytic deposition will be carried out at a temperature of from about 50 to 80 degrees C. at high current densities up to about 3000 ASF. The method of depositing ductile palladium foil on a variety of substrates is also described and claimed.
Inventors
- 👤 Irina Goldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:34
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/50; C25D3/52; H; H05; H05K; H05K3/00; H05K3/22; H05K3/24; H05K3/244
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
67 words
An improved bath for electroplating highly ductile palladium metal, said bath comprising from about 10 to 80 g/l of palladium metal in the form of a palladium amine complex; about 20 to 90 g/l of ammonium sulfate; about 10 to 80 g/l of ammonium halide; from about 20 to 150 g/l of an alkali metal pyrophosphate; a stress reducing agent; and a minor amount of cyanide ions.
Claim 2
Dependent Claim
67 words
An improved bath for electroplating highly ductile palladium metal, said bath comprising from about 10 to 80 g/l of palladium metal in the form of a palladium amine complex; about 20 to 90 g/l of ammonium sulfate; about 10 to 80 g/l of ammonium halide; from about 20 to 150 g/l of an alkali metal pyrophosphate; a stress reducing agent; and a minor amount of cyanide ions.
Claim 3
Dependent Claim
15 words
The bath of claim 1 which contains about 1 to 20 ppm of cyanide ions.
Claim 4
Dependent Claim
18 words
The bath of claim 1 wherein the cyanide ions are in the form of an alkali metal cyanide.
Claim 5
Dependent Claim
12 words
The bath of claim 1 wherein said ammonium halide is ammonium chloride.
Claim 6
Dependent Claim
14 words
The bath of claim 1 wherein the palladium amine complex is palladium diamine chloride.
Claim 7
Dependent Claim
17 words
The bath of claim 1 wherein the stress reducing agent is a derivative of benzene sulphonic acid.
Claim 8
Dependent Claim
18 words
The high speed bath of claim 6 wherein the benzene sulphonic acid derivative is o-formyl benzene sulphonic acid.
Claim 9
Independent Claim
117 words
A method for electrodepositing highly ductile palladium on a metallic substrate which comprises immersing said substrate in an electroplating bath operated at a pH within the range of from about 7 to 9, a temperature of from about 30 to 80 degrees C., and a current density of from about 0.05 to 3000 ASF; said electroplating bath comprising an aqueous solution having the following components: ______________________________________
Components Concentration, g/l
______________________________________
(a) palladium metal, as
10 to 80
palladousamine complex
(b) (NH.sub.4).sub.2 SO.sub.4
20 to 80
(c) NH.sub.4 Cl 10 to 80
(d) alkali metal pyrophosphate
20 to 150
(e) stress reducing agent
0.1 to 10
and
(f) CN, as alkali metal cyanide
1 to 20 ppm.
______________________________________
Claim 10
Independent Claim
117 words
A method for electrodepositing highly ductile palladium on a metallic substrate which comprises immersing said substrate in an electroplating bath operated at a pH within the range of from about 7 to 9, a temperature of from about 30 to 80 degrees C., and a current density of from about 0.05 to 3000 ASF; said electroplating bath comprising an aqueous solution having the following components: ______________________________________
Components Concentration, g/l
______________________________________
(a) palladium metal, as
10 to 80
palladousamine complex
(b) (NH.sub.4).sub.2 SO.sub.4
20 to 80
(c) NH.sub.4 Cl 10 to 80
(d) alkali metal pyrophosphate
20 to 150
(e) stress reducing agent
0.1 to 10
and
(f) CN, as alkali metal cyanide
1 to 20 ppm.
______________________________________
Claim 11
Dependent Claim
18 words
The method of claim 8 wherein the temperature of the bath is from about 50° to 80° C.
Claim 12
Dependent Claim
15 words
The method of claim 8 wherein the current density is from 100 to 3000 ASF.
Claim 13
Dependent Claim
22 words
The method of claim 8 wherein the substrate is selected from the group consisting of copper, nickel, iron, gold, and alloys thereof.
Claim 14
Dependent Claim
13 words
The method of claim 8 wherein the palladousamine complex is palladous amine chloride.
Claim 15
Dependent Claim
13 words
The method of claim 8 wherein the palladiumamine complex is palladous amine nitrite.
Claim 16
Dependent Claim
17 words
The method of claim 8 wherein the stress reducing agent is a derivative of benzene sulphonic acid.
Claim 17
Dependent Claim
15 words
The method of claim 14 wherein the benzene sulphonic acid derivative is o-formyl-benzene sulphonic acid.
References Cited (Backward Citations)
US2452308A
Cited
US4098656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |