Patent US4381228A successfully refreshed from Google Patents.
US4381228A
Expired / Lapsed
US
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Process and composition for the electrodeposition of tin and tin alloys
Assignee: OMI International Corp
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Filing: 1981-06-16
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Granted: 1983-04-26
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Expires: 2001-06-16
Abstract
Abstract An electroplating bath for the high speed deposition of bright metallic tin utilizing tin fluoroborate and sulfuric acid as the electrolyte; wherein, in addition to certain other additives, the bath contains a perfluoroalkyl sulfonate wetting agent to promote anode corrosion. Brighteners used in the system include aromatic amines and aliphatic aldehydes. For certain purposes it may be advantageous to include boric acid as part of the electrolyte; and, in other instances, to use an aromatic sulfonic acid to enhance bath stability and brightness. The method for utilizing a bath containing tin fluoroborate in a sulfuric acid matrix containing these perfluoroalkyl sulfonate wetting agents is also described.
Inventors
- 👤 Robert J. Teichmann
- 👤 Linda J. Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:04
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/30; C25D3/32
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
96 words
An aqueous electroplating bath for the electrodeposition of bright, metallic tin or alloys of tin with copper or rhodium which comprises from 5 to 50 g/l of a bath soluble di-valent tin compound, sulfuric acid in an amount sufficient to maintain the bath pH not in excess of about 2.0, 0.01 to 10 g/l of a perfluoroalkyl sulfonate wetting agent, 0.3 to 15 cc/l of an aromatic amine brightener, 0.1 to 20 g/l of a non-ionic surfactant, and 0.5 to 30 g/l of an aromatic sulfonic acid, said bath being substantially free of other sulfur components.
Claim 2
Dependent Claim
96 words
An aqueous electroplating bath for the electrodeposition of bright, metallic tin or alloys of tin with copper or rhodium which comprises from 5 to 50 g/l of a bath soluble di-valent tin compound, sulfuric acid in an amount sufficient to maintain the bath pH not in excess of about 2.0, 0.01 to 10 g/l of a perfluoroalkyl sulfonate wetting agent, 0.3 to 15 cc/l of an aromatic amine brightener, 0.1 to 20 g/l of a non-ionic surfactant, and 0.5 to 30 g/l of an aromatic sulfonic acid, said bath being substantially free of other sulfur components.
Claim 3
Dependent Claim
14 words
The electroplating bath of claim 1 wherein the divalent tin compound is stannous fluoroborate.
Claim 4
Dependent Claim
20 words
The electroplating bath of claim 2 wherein there is also present 0.5 to 20 cc/l of an aliphatic aldehyde brightener.
Claim 5
Dependent Claim
18 words
The electroplating bath of claim 3 wherein the perfluoroalkyl sulfonate wetting agent is an alkali metal perfluoroalkyl sulfonate.
Claim 6
Dependent Claim
16 words
The electroplating bath of claim 4 wherein the alkali metal perfluoroalkyl sulfonate is potassium perfluoroalkyl sulfonate.
Claim 7
Dependent Claim
14 words
The electroplating bath of claim 5 wherein the nonionic surfactant is a polyoxyalkylene ether.
Claim 8
Dependent Claim
14 words
The electroplating bath of claim 6 wherein the polyoxyalkylene ether is polyoxyethylene lauryl ether.
Claim 9
Dependent Claim
12 words
The electroplating bath of claim 5 wherein said aromatic amine is o-chloroaniline.
Claim 10
Dependent Claim
12 words
The electroplating bath of claim 5 wherein said aliphatic aldehyde is formaldehyde.
Claim 11
Dependent Claim
23 words
The electroplating bath of claim 5 wherein the aromatic sulfonic acid is selected from the group consisting of cresol and phenol sulfonic acids.
Claim 12
Dependent Claim
15 words
The electroplating bath of claim 10 wherein the aromatic sulfonic acid is o-cresol sulfonic acid.
Claim 13
Dependent Claim
22 words
The electroplating bath of claim 5 which also contains an alloying metal selected from the group consisting of copper and rhodium metals.
Claim 14
Dependent Claim
18 words
The electroplating bath of claim 12 wherein the alloying metal is in the form of its sulfate salt.
Claim 15
Independent Claim
51 words
A method for the deposition of bright metallic tin on a substrate which comprises electroplating said substrate in the plating bath of claims 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 1 for a period of time sufficient to form the desired electrodeposit on the substrate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-25 | 1986-10-25 | 1987-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-25 | 1990-10-25 | 1991-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-25 | 1994-10-25 | 1995-04-26 | $7700.00 | Window Closed / Lapsed |