US4448748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc-aluminum alloys and coatings
Assignee: International Lead Zinc Research Organization Inc
•
Filing: 1982-08-02
•
Granted: 1984-05-15
•
Expires: 2002-08-02
Abstract
Abstract There is disclosed an alloy for use in a zinc galvanizing bath comprising zinc, aluminum and a rare earth-containing alloy such as mischmetal. According to the preferred embodiments, the alloy contains from about 85% to about 97% zinc, from about 3% to about 15% aluminum and from about 5 ppm to about 1.0% mischmetal. The alloy may also contain one or more of the elements Fe, Pb, Sb, Mg, Sn, Cu and Si.
Inventors
- 👤 Schrade F. Radtke
- 👤 Dimitri Coutsouradis
- 👤 Jacques Pelerin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:09
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/04; C23C2/06; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12799
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
36 words
A protective metal coating adhered to a substrate, said coating comprising from about 85% to about 97% Zn, from about 4% to about 15% Al, and at least about 5 ppm of a rare earth-containing alloy.
Claim 2
Dependent Claim
36 words
A protective metal coating adhered to a substrate, said coating comprising from about 85% to about 97% Zn, from about 4% to about 15% Al, and at least about 5 ppm of a rare earth-containing alloy.
Claim 3
Dependent Claim
13 words
A coating according to claim 1 wherein the rare earth-containing alloy is mischmetal.
Claim 4
Dependent Claim
15 words
A coating according to claim 2 containing from about 5 ppm to about 1.0% mischmetal.
Claim 5
Dependent Claim
14 words
A coating according to claim 3 containing from about 0.01 to about 0.1% mischmetal.
Claim 6
Dependent Claim
13 words
A coating according to claim 4 wherein the mischmetal is Ce-mischmetal or La-mischmetal.
Claim 7
Dependent Claim
12 words
A coating according to claim 4, said coating containing about 5% Al.
Claim 8
Dependent Claim
13 words
A coating according to claim 3 wherein the mischmetal is Ce-mischmetal or La-mischmetal.
Claim 9
Dependent Claim
35 words
A coating according to claim 7 wherein said mischmetal is a Ce-mischmetal comprising from about 45-60% Ce, from about 35 to 50% other rare earths, and the balance comprising Fe, Mg, Al, Si and impurities.
Claim 10
Dependent Claim
32 words
A coating according to claim 7 wherein said mischmetal is a Ce-mischmetal comprising about 52.7% Ce, other rare earths 47.5%, Fe 0.04%, Mg 0.28%, Al 0.08%, Si 0.27% and the balance impurities.
Claim 11
Dependent Claim
33 words
A coating according to claim 7 wherein said mischmetal is a La-mischmetal comprising about 60-90% La, 8.5% Ce, 6.5% Nd, 2% Pr, and the balance comprising Fe, Mg, Al and Si and impurities.
Claim 12
Dependent Claim
31 words
A coating according to claim 10 wherein said mischmetal comprises about 83% La, 8.5% Ce, 6.5% Nd, 2% Pr, 0.2% Fe, 0.03% Mg, 0.18% Al, 0.43% Si and the balance impurities.
Claim 13
Dependent Claim
30 words
A coating according to claim 3, said coating containing additionally at least one of the elements selected from the group consisting of Fe, Pb, Sb, Mg, Sn, Cu, and Si.
Claim 14
Dependent Claim
11 words
A coating according to claim 3, said coating containing additionally antimony.
Claim 15
Dependent Claim
11 words
A coating according to claim 13, said coating containing additionally lead.
Claim 16
Dependent Claim
16 words
A coating according to claim 14 containing from about 0.03-0.15% Sb and less than 0.02% Pb.
Claim 17
Dependent Claim
13 words
A coating according to claim 3, said coating containing additionally Mg and Pb.
Claim 18
Dependent Claim
16 words
A coating according to claim 16 containing from about 0.02-0.15% Mg and from about 0.02-0.15% Pb.
Claim 19
Dependent Claim
11 words
A coating according to claim 17, said coating containing additionally Cu.
Claim 20
Dependent Claim
11 words
A coating according to claim 18 containing from about 0.1-0.3% Cu.
Claim 21
Dependent Claim
12 words
A coating according to claim 3, said coating containing about 5% Al.
Claim 22
Dependent Claim
24 words
A coating according to claim 3 consisting essentially of about 5% Al, from about 5 ppm to about 0.1% mischmetal and the balance zinc.
Claim 23
Independent Claim
59 words
A method of applying a protective metal coating to a substrate comprising the steps of immersing the substrate in a molten alloy comprised of zinc, aluminum and mischmetal, said bath formulated so as to yield a coating comprising from about 85% to about 97% Zn, from about 3% to about 15% Al, and at least about 5 ppm mischmetal.
Claim 24
Independent Claim
59 words
A method of applying a protective metal coating to a substrate comprising the steps of immersing the substrate in a molten alloy comprised of zinc, aluminum and mischmetal, said bath formulated so as to yield a coating comprising from about 85% to about 97% Zn, from about 3% to about 15% Al, and at least about 5 ppm mischmetal.
Claim 25
Dependent Claim
21 words
A method according to claim 22 wherein said mischmetal is added to the alloy in the form of a master alloy.
Claim 26
Dependent Claim
16 words
A method according to claim 23 wherein said master alloy comprises 20% Zn and 80% mischmetal.
Claim 27
Dependent Claim
18 words
A method according to claim 23 wherein said master alloy comprises about 85-95% Al and about 5-15% mischmetal.
References Cited (Backward Citations)
US3383297A
Cited
US3360366A
Cited
US4152472A
Cited
US4056366A
Cited
US4029478A
Cited
US4128676A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |