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US3923557A
Expired / Lapsed
US
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Corrosion resistant aluminum alloys
Assignee: Rio Tinto Switzerland AG
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Filing: 1974-03-14
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Granted: 1975-12-02
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Expires: 1994-03-14
Abstract
Abstract A corrosion resistant aluminum alloy based on commercial purity aluminum with deliberate additions of silicon and manganese and with a restricted iron content. The silicon and manganese ranges are controlled to provide an aluminum-silicon solid solution and to restrict or eliminate cathodic particles which have been found to cause pits. The alloy is highly resistant to corrosion, especially in environments where the alloy comes into contact with impure water.
Inventors
- 👤 William H Anthony
- 👤 Popplewell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:04
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/22; B23K20/233; B23K20/2336; B32; B32B; B32B15/00; B32B15/01; B32B15/016
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
58 words
A CORROSION RESISTANT ALUMIN BASE ALLOY RESISTANT TO PITTING AND CORROSION IN AN AQUEOUS ENVIRONMENT CONSISTING ESSENTIALLY OF FROM 0.05 TO 0.5% SILICON, WHEREIN THE SILICON IS PRESENT IN SOLID SOLUTION, FROM 0.2 TO 0.8% MANGANESE, FROM 0.001 TO 0.2% IRON, FROM 0.001 TO 0.1% CHROMIUM, FROM 0.001 TO 0.1% MAGNESIUM, FROM 0.001 TO 0.1% COPPER, FROM 0.001
Claim 2
Dependent Claim
58 words
A CORROSION RESISTANT ALUMIN BASE ALLOY RESISTANT TO PITTING AND CORROSION IN AN AQUEOUS ENVIRONMENT CONSISTING ESSENTIALLY OF FROM 0.05 TO 0.5% SILICON, WHEREIN THE SILICON IS PRESENT IN SOLID SOLUTION, FROM 0.2 TO 0.8% MANGANESE, FROM 0.001 TO 0.2% IRON, FROM 0.001 TO 0.1% CHROMIUM, FROM 0.001 TO 0.1% MAGNESIUM, FROM 0.001 TO 0.1% COPPER, FROM 0.001
Claim 3
Dependent Claim
14 words
An alloy according to claim 1 wherein the silicon is from 0.15 to 0.25%.
Claim 4
Dependent Claim
11 words
An alloy according to claim 1 containing less than 0.4% manganese.
Claim 5
Dependent Claim
15 words
An alloy according to claim 1 wherein the iron content is from 0.001 to 0.08%.
Claim 6
Dependent Claim
28 words
An alloy according to claim 1 containing from 0.001 to 0.05% chromium, from 0.001 to 0.05% copper, from 0.005 to 0.015% titanium, and from 0.001 to 0.05% zinc.
Claim 7
Dependent Claim
14 words
An alloy according to claim 1 wherein the magnesium content is less than 0.01%.
Claim 8
Dependent Claim
71 words
An aluminum base alloy article highly resistant to pitting and corrosion in an aqueous environment wherein the alloy consists essentially of from 0.05 to 0.5% silicon, wherein the silicon is present in solid solution, from 0.2 to 0.8% manganese, from 0.001 to 0.2% iron, from 0.001 to 0.1% chromium, from 0.001 to 0.1% magnesium, from 0.001 to 0.1% copper, from 0.001 to 0.05% titanium, from 0.001 to 0.1% zinc, balance aluminum.
Claim 9
Dependent Claim
71 words
An aluminum base alloy article highly resistant to pitting and corrosion in an aqueous environment wherein the alloy consists essentially of from 0.05 to 0.5% silicon, wherein the silicon is present in solid solution, from 0.2 to 0.8% manganese, from 0.001 to 0.2% iron, from 0.001 to 0.1% chromium, from 0.001 to 0.1% magnesium, from 0.001 to 0.1% copper, from 0.001 to 0.05% titanium, from 0.001 to 0.1% zinc, balance aluminum.
References Cited (Backward Citations)
US3219492A
Cited
US3639107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |