US4032413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroplating bath and method for the electrodeposition of bright aluminum coatings
Assignee: Siemens AG
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Filing: 1975-11-12
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Granted: 1977-06-28
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Expires: 1995-11-12
Abstract
Abstract The invention provides an electroplating bath and a method for the electrodeposition of bright aluminum coatings on metals and conductive materials with aprotic oxygen- and water-free, organo-aluminum electrolytes which contain as a brightener at least one additive with at least one sulfonamide, sulfonimide and/or carbimide group. Particularly suitable brighteners are o-benzoic acid sulfonimide, N-benzoylbenzenesulfonamide and the reaction products of o-benzoic acid sulfonimide or N-benzoylbenzenesulfonamide with aluminum triethyl. Using the method, a fast-adhering and corrosion-resistant bright aluminum coating is obtained which finds use for decorative purposes and, generally, for corrosion protection in surface finishing, e.g., also as mirrors and reflectors for light and heat radiators.
Inventors
- 👤 Richard Dotzer
- 👤 Hans-Georg Hauschildt
- 👤 Enno Todt, deceased
- 👤 legal heir by Susanne Todt
- 👤 legal heir by Ruth Katharina Todt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:51
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/42; C25D3/44
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
34 words
An aluminum electroplating bath comprising an aprotic oxygen- and water-free organo-aluminum electrolyte medium and at least one additive containing a brightener selected from the group consisting of a sulfonamide, sulfonimide, carbimide and mixtures thereof.
Claim 2
Dependent Claim
34 words
An aluminum electroplating bath comprising an aprotic oxygen- and water-free organo-aluminum electrolyte medium and at least one additive containing a brightener selected from the group consisting of a sulfonamide, sulfonimide, carbimide and mixtures thereof.
Claim 3
Dependent Claim
19 words
The electroplating bath of claim 1 wherein said additive comprises from 1 to 50 g/liter of said electrolyte medium.
Claim 4
Dependent Claim
19 words
The electroplating bath of claim 1 wherein said additive comprises from 10 to 20 g/liter of said electrolyte medium.
Claim 5
Dependent Claim
21 words
The aluminum electroplating bath of claim 1 wherein the electrolyte is NaF.2Al(C 2 H 5 ) 3 in a toluene solution.
Claim 6
Dependent Claim
29 words
The aluminum electroplating bath of claim 1 wherein the electrolyte is [(C 2 H 5 ) 4 N][ Cl.2Al(C 2 H 5 ) 3 ] in a toluene solution.
Claim 7
Dependent Claim
18 words
The aluminum electroplating bath of claim 1 wherein the additive is o-benzoic acid sulfonimide having the formula ##STR5##
Claim 8
Dependent Claim
13 words
The aluminum electroplating bath of claim 1 wherein the additive is N-benzoylbenzene sulfonamide.
Claim 9
Dependent Claim
36 words
The aluminum electroplating bath of claim 1 wherein the additive is the reaction product of an organic compound containing a group selected from the group consisting of sulfonamide, sulfonimide, carbimide, and mixtures thereof, with aluminum trialkyl.
Claim 10
Dependent Claim
14 words
The aluminum electroplating bath of claim 8 wherein the aluminum trialkyl is aluminum triethyl.
Claim 11
Dependent Claim
21 words
The aluminum electroplating bath of claim 8 wherein the additive is the reaction product of o-benzoic acid sulfonimide and aluminum triethyl.
Claim 12
Dependent Claim
20 words
The aluminum electroplating bath of claim 8 wherein the additive is the reaction product of N-benzoylbenzene sulfonamide and aluminum triethyl.
Claim 13
Independent Claim
111 words
A method for electrodepositing a bright aluminum on a metal or electrically conductive substrate comprising; (a) employing said substrate as the cathode of an electrolytic cell containing an electrolytic plating bath comprising an aprotic oxygen and water-free organo-aluminum electrolyte medium and at least one additive containing a brightener selected from the group consisting of sulfonamide, sulfimide, carbimide, and mixtures thereof; (b) operating said cell at temperatures from 50° to 120° C. with periodic stirring using an initial current density of up to 1.0 A/dm 2 , on operating current density of from 0.5 to 10 A/dm 2 , and using polarity reversal cycles to deposit an aluminum coating on said substrate.
Claim 14
Independent Claim
111 words
A method for electrodepositing a bright aluminum on a metal or electrically conductive substrate comprising; (a) employing said substrate as the cathode of an electrolytic cell containing an electrolytic plating bath comprising an aprotic oxygen and water-free organo-aluminum electrolyte medium and at least one additive containing a brightener selected from the group consisting of sulfonamide, sulfimide, carbimide, and mixtures thereof; (b) operating said cell at temperatures from 50° to 120° C. with periodic stirring using an initial current density of up to 1.0 A/dm 2 , on operating current density of from 0.5 to 10 A/dm 2 , and using polarity reversal cycles to deposit an aluminum coating on said 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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |