US4711667A
Expired / Lapsed
US
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Corrosion resistant aluminum coating
Assignee: FJ BEERS PARTNERSHIP
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Filing: 1986-09-18
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Granted: 1987-12-08
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Expires: 2006-09-18
Abstract
Abstract An aluminum conversion coating by coating composition for coating aluminum or an aluminum alloy. The composition has as an essential ingredient an alkaline metal permanganate and a pH of 7 to less than 12.5. The composition containing a buffer, such as alkaline metal tetraborate, is effective for protecting the aluminum and aluminum alloys for more than 168 hours in salt fog at 95° F. according to standard ASTM method B-117. The process, of coating the aluminum or aluminum alloy is generally carried out by cleaning the aluminum or aluminum alloy with sodium hydroxide, hydrofluoric acid or borax and then coating with the permanganate composition.
Inventors
- 👤 John W. Bibber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:24
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C22/00; C23C22/05; C23C22/60; C23C22/66
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
63 words
A basic pH aluminum coating composition to provide a a protective conversion coating for aluminum and aluminum alloys comprising as the essential ingredient thereof an alkali metal permanganate and a buffer compound selected from the group consisting of an alkali metal tetraborate, alkali metal metaborate, benzoic acid, alkali metal benzoate, alkali metal carbonate, and a mixture of the alkali metal tetra and metaborate.
Claim 2
Dependent Claim
63 words
A basic pH aluminum coating composition to provide a a protective conversion coating for aluminum and aluminum alloys comprising as the essential ingredient thereof an alkali metal permanganate and a buffer compound selected from the group consisting of an alkali metal tetraborate, alkali metal metaborate, benzoic acid, alkali metal benzoate, alkali metal carbonate, and a mixture of the alkali metal tetra and metaborate.
Claim 3
Dependent Claim
11 words
The composition of claim 1 wherein the permanganate is potassium permanganate.
Claim 4
Dependent Claim
25 words
The composition of claim 2 wherein one of the essential ingredients is selected from the group consisting of sodium tetraborate, sodium metaborate and mixtures thereof.
Claim 5
Dependent Claim
15 words
The composition of claim 1 having a pH in the range of 7 to 12.5.
Claim 6
Dependent Claim
17 words
The base composition of claim 4 wherein the pH is in the range of 9 to 10.
Claim 7
Dependent Claim
45 words
The base oomposition of claim 4 wherein the composition contains as an essential ingredient a compound selected from the group consisting of alkali metal tetraborate, alkali metal metaborate, alkali metal benzoate, alkali metal carbonate, benzoic acid, and mixtures of the alkali metal tetra and metaborate.
Claim 8
Dependent Claim
12 words
The composition of claim 6 which contains potassium permanganate and sodium tetraborate.
Claim 9
Dependent Claim
17 words
The composition of claim 7 wherein the composition contains at least 500 mg/l of borax-5H 2 O.
Claim 10
Dependent Claim
47 words
The composition of claim 4 wherein the composition contains at least 700 ppm of manganese and a buffer selected from the group consisting of benzoic acid, alkali metal tetraborate, alkali metal metaborate, mixtures of the alkali metal tetra and metaborates, alkali metal benzoate, and alkali metal carbonate.
Claim 11
Dependent Claim
11 words
The composition of claim 9 wherein the buffer is sodium benzoate.
Claim 12
Dependent Claim
17 words
The composition of claim 9 wherein the composition contains at least 500 mg/l of borax-5H 2 O.
Claim 13
Dependent Claim
24 words
The composition of claim 1 which contains: 0.05 to 9% by weight borax-5H 2 O 0.2 to 6.3% by weight of KMnO 4 .
Claim 14
Dependent Claim
27 words
The composition of claim 1 wherein the composition contains: 0.05% to 44% by weight of alkaline metal benzoate 0.2 to 6.3% by weight of KMnO 4 .
Claim 15
Dependent Claim
26 words
The composition of claim 1 wherein the composition contains: 0.05% to 31.5% by weight of sodium carbonate 0.2 to 6.3% by weight of KMnO 4 .
Claim 16
Dependent Claim
87 words
The composition of claim 1 wherein all percentages are by weight and selected from the group consisting of those containing as essential ingredients: (a) 1.0% borax-5H 2 O, 0.2% KMnO 4 ; (b) 0.05% borax-5H 2 O, 3.0% KMnO 4 ; (c) 9.0% borax-5H 2 O, 4.0% KMnO 4 ; (d) 1.0% borax-5H 2 O, 1.0% KMnO 4 ; (e) 1.0% sodium benzoate, 1.0% KMnO 4 ; (f) 1.0% Na 2 CO 3 , 1.0% KMnO 4 ; (g) 1.0% borax-5H 2 O, 3.0% KMnO 4 .
Claim 17
Independent Claim
90 words
A method of protecting aluminum and aluminum alloys with a protective coating comprising contacting the aluminum with a base aqueous solution containing as essential ingredients an alkali metal permanganate and a buffer compound selected from the group consisting of alkali metal tetraborate, alkali metal metaborate, alkali metal carbonates, benzoic acid, alkali metal benzoate, and mixtures of alkali metal meta-and tetraborate, said solution having a pH in the range of 7 to less than 12.5, forming a conversion coating on the aluminum, and removing any excess coating solution from the aluminum.
Claim 18
Independent Claim
90 words
A method of protecting aluminum and aluminum alloys with a protective coating comprising contacting the aluminum with a base aqueous solution containing as essential ingredients an alkali metal permanganate and a buffer compound selected from the group consisting of alkali metal tetraborate, alkali metal metaborate, alkali metal carbonates, benzoic acid, alkali metal benzoate, and mixtures of alkali metal meta-and tetraborate, said solution having a pH in the range of 7 to less than 12.5, forming a conversion coating on the aluminum, and removing any excess coating solution from the aluminum.
Claim 19
Dependent Claim
19 words
The method of claim 16 wherein the pH of the solution is in the range of 9 to 10.
Claim 20
Dependent Claim
43 words
The method of claim 6 wherein the solution also contains as an essential ingredient a compound selected from the group consisting of alkali metal tetraborate, alkali metal metaborate, alkali metal carbonates, benzoic acid, alkali metal benzoate, and mixtures of alkali metal meta-and tetraborate.
Claim 21
Dependent Claim
22 words
The method of claim 17 wherein the solution contains at least 500 mg/l of borax-5H 2 O and 700 ppm of Manganese.
Claim 22
Dependent Claim
18 words
The method of claim 19 wherein the permangantate is potassium permanganate and the solution also contains sodium nitrate.
Claim 23
Dependent Claim
23 words
The method of claim 16 wherein the aluminum is first cleaned with a cleaning composition selected from sodium hydroxide, hydrofluoric acid and borax.
Claim 24
Dependent Claim
23 words
The method of claim 17 wherein the aluminum is first cleaned with a cleaning composition selected from sodium hydroxide, hydrofluoric acid and borax.
Claim 25
Dependent Claim
23 words
The method of claim 19 wherein the aluminum is first cleaned with a cleaning composition selected from sodium hydroxide, hydrofluoric acid and borax.
Claim 26
Dependent Claim
30 words
Aluminum and aluminum alloys having a corrosion resistant coating thereon produced by the method of claim 16 and being corrosion resistant to a salt fog for at least 168 hours.
Claim 27
Dependent Claim
17 words
Aluminum and aluminum alloys having a corrosion resistant coating thereon produced by the method of claim 14.
Claim 28
Dependent Claim
30 words
Aluminum and aluminum alloys having a corrosion resistant coating thereon produced by the method of claim 19 and being corrosion resistant to a salt fog for at least 168 hours.
Claim 29
Dependent Claim
30 words
Aluminum and aluminum alloys having a corrosion resistant coating thereon produced by the method of claim 20 and being corrosion resistant to a salt fog for at least 168 hours.
Claim 30
Dependent Claim
30 words
Aluminum and aluminum alloys having a corrosion resistant coating thereon produced by the method of claim 23 and being corrosion resistant to a salt fog for at least 168 hours.
Claim 31
Dependent Claim
52 words
Aluminum or aluminum alloy coated with a composition containing as the essential ingredient thereof an alkali metal permanganate and a buffer compound selected from the group consisting of an alkali metal tetraborate, alkali metal metaborate, benzoic acid, alkali metal benzoate, alkali metal carbonate, and a mixture of alkali metal tetra and metaborate.
Claim 32
Dependent Claim
52 words
Aluminum or aluminum alloy coated with a composition containing as the essential ingredient thereof an alkali metal permanganate and a buffer compound selected from the group consisting of an alkali metal tetraborate, alkali metal metaborate, benzoic acid, alkali metal benzoate, alkali metal carbonate, and a mixture of alkali metal tetra and metaborate.
Claim 33
Dependent Claim
23 words
The aluminum or aluminum alloys of claim 29 wherein said composition has a pH in the range of 7 to less than 12.5.
Claim 34
Dependent Claim
45 words
The aluminum or aluminum alloys of claim 30 coated with a composition wherein the composition contains as an essential ingredient a compound selected from the group consisting of alkali metal tetraborate, alkali metal metaborate, alkali metal benzoate, and mixtures of the alkali metal tetra-and metaborate.
Claim 35
Dependent Claim
25 words
The aluminum or aluminum alloys of claim 31 wherein the composition contains at least 700 ppm of Manganese and 500 mg/l of borax-5H 2 O.
Claim 36
Dependent Claim
31 words
The aluminum or aluminum alloys of claim 30 coated with a composition containing: 0.05 to 9% by weight borax-5H 2 O, and 0.2 to 6.3% by weight of KMnO 4 .
Claim 37
Dependent Claim
32 words
The aluminum or aluminum alloys of claim 30 coated with a composition containing: 0.05% to 44% by weight of alkali metal benzoate and 0.2 to 6.3% by weight of KMnO 4 .
Claim 38
Dependent Claim
31 words
The aluminum or aluminum alloys of claim 30 coated with a composition containing: 0.05% to 31.5% by weight of sodium carbonate and 0.2 to 6.3% by weight of KMnO 4 .
Claim 39
Dependent Claim
88 words
The aluminum or aluminum alloys of claim 30 coated with a composition selected from the group consisting of those containing as essential ingredients: (a) 1.0% borax-5H 2 O, 0.2% KMnO 4 ; (b) 0.05% borax-5H 2 O, 3.0% KMnO 4 ; (c) 9.0% borax-5H 2 O, 4.0% KMnO 4 ; (d) 1.0% borax-5H 2 O, 1.0% KMnO 4 ; (e) 1.0% sodium benzoate, 1.0% KMnO 4 ; (f) 1.0% Na 2 CO 3 , 1.0% KMnO 4 ; and (g) 1.0% borax-5H 2 O, 3.0% KMnO 4 .
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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) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |