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US4505958A
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Method for hot dip galvanizing metallic workpieces
Assignee: FEUERVERZINKEREI H HUSTER & Co SELBECKER STRASSE 141- 143 5800 HAGEN/DEUTSCHLAND GmbH
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Filing: 1982-05-14
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Granted: 1985-03-19
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Expires: 2002-05-14
Abstract
Abstract Process for hot dip galvanizing workpieces of steel or iron materials wherein a treatment with fluxing agent is omitted. After being cleaned, the workpieces are coated with a thin metal layer which replaces the previously customarily applied fluxing agent layer and are immersed into the zinc melt with their surfaces in the dry state.
Inventors
- 👤 Hans-Wilhelm Lieber
- 👤 Roland Kammel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:00
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/003; C23C2/0038; C23C2/02; C23C2/024; C23C2/026
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
152 words
Process for fluxless hot dip galvanizing steel and ferrous metallic workpiece by immersing them in a zinc melt, the workpieces being subjected to a pretreatment which includes cleaning the surfaces of the workpieces and coating the surfaces of the workpieces with a reactive layer which assures a reaction with the zinc melt on the entire surfaces of the workpieces, and wherein the workpieces are immersed in the zinc melt with their surfaces in the dry state and are removed from said zinc melt after a predetermined period of time, comprising: applying a thin metal layer to the workpieces as the reactive layer and immersing the workpieces in the zinc metal, wherein said workpieces are immersed in the zinc melt after rinsing and drying, if necessary, but without a prior fluxing agent treatment and without chemical treatment between the application of the thin metal layer and immersing the workpieces in the zinc melt.
Claim 2
Dependent Claim
152 words
Process for fluxless hot dip galvanizing steel and ferrous metallic workpiece by immersing them in a zinc melt, the workpieces being subjected to a pretreatment which includes cleaning the surfaces of the workpieces and coating the surfaces of the workpieces with a reactive layer which assures a reaction with the zinc melt on the entire surfaces of the workpieces, and wherein the workpieces are immersed in the zinc melt with their surfaces in the dry state and are removed from said zinc melt after a predetermined period of time, comprising: applying a thin metal layer to the workpieces as the reactive layer and immersing the workpieces in the zinc metal, wherein said workpieces are immersed in the zinc melt after rinsing and drying, if necessary, but without a prior fluxing agent treatment and without chemical treatment between the application of the thin metal layer and immersing the workpieces in the zinc melt.
Claim 3
Dependent Claim
20 words
Process as defined in claim 1, wherein the thin metal layer is applied to the workpieces in a pickling-degreasing solution.
Claim 4
Dependent Claim
21 words
Process as defined in claim 1 or 2, wherein the thin metal layer has a thickness of less than 1 μm.
Claim 5
Dependent Claim
13 words
Process as defined in claim 1, wherein the thin metal layer contains pores.
Claim 6
Dependent Claim
14 words
Process as defined in claim 1, wherein the thin metal layer is applied electrochemically.
Claim 7
Dependent Claim
15 words
Process as defined in claim 1, wherein the thin metal layer is applied chemically reductively.
Claim 8
Dependent Claim
15 words
Process as defined in claim 1, wherein the thin metal layer is applied by cementation.
Claim 9
Dependent Claim
16 words
Process as defined in claim 1, wherein the thin metal layer is applied by contact metallization.
Claim 10
Dependent Claim
14 words
Process as defined in claim 1, wherein the thin metal layer is applied mechanically.
Claim 11
Dependent Claim
14 words
Process as defined in claim 1, wherein the thin metal layer is applied physically.
Claim 12
Dependent Claim
28 words
Process as defined in claim 1, wherein the thin metal layer is a layer of aluminum, antimony, lead, cadmium, copper, nickel, bismuth, zinc, tin or an allow thereof.
Claim 13
Dependent Claim
22 words
A process as defined in claim 1, wherein the thin metal layer is a layer of aluminum, antimony, cadmium, copper or zinc.
Claim 14
Dependent Claim
17 words
Process as defined in claim 1, wherein the thin metal layer is applied by a currentless method.
Claim 15
Dependent Claim
30 words
A process as defined in claim 1, wherein said thin metal layer is applied dry and the workpieces are immersed directly into the zinc melt without first rinsing and drying.
Claim 16
Dependent Claim
13 words
Process as defined in claim 2, wherein the thin metal layer contains pores.
Claim 17
Dependent Claim
14 words
Process as defined in claim 2, wherein the thin metal layer is applied electrochemically.
Claim 18
Dependent Claim
15 words
Process as defined in claim 2, wherein the thin metal layer is applied chemically reductively.
Claim 19
Dependent Claim
15 words
Process as defined in claim: 2, wherein the thin metal layer is applied by cementation.
Claim 20
Dependent Claim
16 words
Process as defined in claim 2, wherein the thin metal layer is applied with contact metallization.
Claim 21
Dependent Claim
14 words
Process as defined in claim 2, wherein the thin metal layer is applied mechanically.
Claim 22
Dependent Claim
14 words
Process as defined in claim 2, wherein the thin metal layer is applied physically.
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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) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |