US3920526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the electrodeposition of ductile palladium and electroplating bath useful therefor
Assignee: International Business Machines Corp
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Filing: 1974-03-12
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Granted: 1975-11-18
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Expires: 1994-03-12
Abstract
Abstract Non-porous ductile palladium is obtained by electrodeposition from a high chloride bath comprising: ABOUT 16 TO ABOUT 32 G/L OF Pd(NH3)2Cl2(palladosammine chloride), about 65 to 250 g/l of NH4Cl and sufficient aqueous NH3 to provide a pH of at least 8.8.
Inventors
- 👤 Jr Jerome J Caricchio
- 👤 Jr George J Saxenmeyer
- 👤 Edward R York
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:26
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/50
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
40 words
AN AQUEOUS ELECTRODEPOSITION BATH FOR ELECTRODEPOSITING NON-POROUS, DUCTILE PALLADIUM WHICH COMPRISES: FROM ABOUT 16 TO ABOUT 32 G/L PD(NH3)2CL2; FROM ABOUT 65 TO ABOUT 250 G/L OF NH4CL; AND AQUEOUS AMMONIA TO PROVIDE A PH OF AT LEAST ABOUT 8.8.
Claim 2
Dependent Claim
40 words
AN AQUEOUS ELECTRODEPOSITION BATH FOR ELECTRODEPOSITING NON-POROUS, DUCTILE PALLADIUM WHICH COMPRISES: FROM ABOUT 16 TO ABOUT 32 G/L PD(NH3)2CL2; FROM ABOUT 65 TO ABOUT 250 G/L OF NH4CL; AND AQUEOUS AMMONIA TO PROVIDE A PH OF AT LEAST ABOUT 8.8.
Claim 3
Dependent Claim
16 words
The aqueous electrodeposition bath of claim 1 which consists essentially of Pd(NH3)2Cl2, NH4Cl and aqueous ammonia.
Claim 4
Dependent Claim
22 words
The aqueous electrodeposition bath of claim 2 where the pH of the electrodeposition bath is from about pH 8.8 to about 9.2.
Claim 5
Dependent Claim
23 words
The aqueous electrodeposition bath of claim 3 where the NH4Cl is present in an amount of from about 130 to about 250 g/l.
Claim 6
Dependent Claim
20 words
The aqueous electrodeposition bath of claim 2 where Pd(NH3)2Cl2 is present in an amount of from 17 to 27 g/l.
Claim 7
Independent Claim
77 words
A method for electrodepositing non-porous, ductile palladium on a substrate which comprises immersing an anode in an aqueous electrodeposition bath which comprises: from about 16 to about 32 g/l Pd(NH3)2Cl2; from about 65 to about 250 g/l of NH4Cl; and aqueous ammonia to provide a pH of at least about 8.8, immersing the substrate to be coated in said electrodeposition bath; and applying a potential difference between the anode and substrate to conduct the electrodeposition of palladium.
Claim 8
Independent Claim
77 words
A method for electrodepositing non-porous, ductile palladium on a substrate which comprises immersing an anode in an aqueous electrodeposition bath which comprises: from about 16 to about 32 g/l Pd(NH3)2Cl2; from about 65 to about 250 g/l of NH4Cl; and aqueous ammonia to provide a pH of at least about 8.8, immersing the substrate to be coated in said electrodeposition bath; and applying a potential difference between the anode and substrate to conduct the electrodeposition of palladium.
Claim 9
Dependent Claim
17 words
The method of claim 6 where the electrodeposition bath consists essentially of Pd(NH3)2Cl2, NH4Cl and aqueous ammonia.
Claim 10
Dependent Claim
24 words
The method of claim 7 where electrodeposition is carried out at an apparent current density of from about 0.2 to about 2.0 amps/sq. dm.
Claim 11
Dependent Claim
30 words
The method of claim 8 where the free chloride content of the electrodeposition batH is maintained within the range of from about 50 to about 200 g/l during the electrodeposition.
Claim 12
Dependent Claim
25 words
The method of claim 9 where the Pd(NH3)2Cl2 concentration is maintained within the range of from about 16 to about 32 g/l during the electrodeposition.
Claim 13
Dependent Claim
29 words
The method of claim 8 wherein the electrodeposition is a rack or still electrodeposition carried out at an apparent current density of about 0.5 to about 2.0 amps/sq. dm.
Claim 14
Dependent Claim
11 words
The method of claim 11 where the electrodeposition is without agitation.
Claim 15
Dependent Claim
27 words
The method of claim 8 where the electrodeposition is a barrel electrodeposition carried out at an apparent current density of about 0.2 to about 0.3 amp/sq. dm.
Claim 16
Dependent Claim
18 words
The method of claim 7 where Pd(NH3)2Cl2 is present in an amount of from 17 to 27 g/l.
Claim 17
Dependent Claim
16 words
The method of claim 6 where the electrodeposited palladium is at least about 1 Mu thick.
References Cited (Backward Citations)
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US2452308A
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |