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Patent US4381975A successfully refreshed from Google Patents.
US4381975A
Expired / Lapsed
US
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Aluminium electroplating solution
Assignee: US Philips Corp
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Filing: 1982-01-18
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Granted: 1983-05-03
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Expires: 2002-01-18
Abstract
Abstract Electrolyte liquid for the electrodeposition of aluminium, containing lithium hydride and/or lithium aluminium hydride and at least one aluminium halide dissolved in tetrahydrofuran or halogen and/or methyl derivatives, the molar ratio between the Al-halide and the lithium aluminium hydride being in excess of 3. In addition, this bath contains an alkali metal aluminium chloride. This liquid is conspicuous for its high conductivity and its great stability.
Inventors
- 👤 Theo E. G. Daenen
- 👤 Gerardus A. R. Van Dijk
- 👤 Steven A. Stolk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:54
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/42; C25D3/44
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
An electrolyte bath for the electrodeposition of ductile aluminum on a substrate, containing lithium hydride and/or lithium aluminum hydride and at least one aluminum halide, dissolved in tetrahydrofuran or halogen and/or methyl derivatives thereof, characterized in that n, defined as n=(X-1/4Z)/(Y+1/4Z) wherein X is the total number of moles of dissolved aluminum halide, Y is the total number of moles of dissolved lithium aluminum hydride, Z is the total number of moles of lithium hydride, is greater than 3 and an effective quantity exceeding 0.35 moles/l of alkali metal aluminum chloride is added to the bath.
Claim 2
Dependent Claim
96 words
An electrolyte bath for the electrodeposition of ductile aluminum on a substrate, containing lithium hydride and/or lithium aluminum hydride and at least one aluminum halide, dissolved in tetrahydrofuran or halogen and/or methyl derivatives thereof, characterized in that n, defined as n=(X-1/4Z)/(Y+1/4Z) wherein X is the total number of moles of dissolved aluminum halide, Y is the total number of moles of dissolved lithium aluminum hydride, Z is the total number of moles of lithium hydride, is greater than 3 and an effective quantity exceeding 0.35 moles/l of alkali metal aluminum chloride is added to the bath.
Claim 3
Dependent Claim
29 words
An electrolyte bath as claimed in claim 1, characterized in that the alkali metal aluminum chloride is added to the bath in an quantity between 0.37 and 0.6 moles/l.
Claim 4
Dependent Claim
21 words
An electrolyte bath as claimed in claim 1 or 2, characterized in that lithium aluminum chloride is added to the bath.
Claim 5
Dependent Claim
19 words
An electrolyte bath as claimed in claim 1, characterized in that n has a value between 4 and 5.5.
Claim 6
Dependent Claim
39 words
A method of preparing an electrolyte bath as claimed in claim 1, characterized in that the alkali aluminum chloride is added in the form of crystalline compound LiAlCl 4 .mTHF, wherein m has the value 2, 4 or 8.
Claim 7
Dependent Claim
21 words
A method of electrodepositing ductile aluminum on an electrically conducting substrate comprising using an electrolyte liquid as claimed in claim 1.
Claim 8
Dependent Claim
19 words
A substrate provided with a layer of ductile aluminum obtained by means of the method claimed in claim 6.
References Cited (Backward Citations)
US3595760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |