US5068134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of protecting galvanized steel from corrosion
Assignee: Zaclon Corp
•
Filing: 1989-12-19
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Granted: 1991-11-26
•
Expires: 2009-12-19
Abstract
Abstract This invention is directed to a process of protecting galvanized metal from white rust corrosion which comprises treating the galvanized metal, i.e., zinc-containing coating, at a temperature above about 125° C. with at least one silica compound.
Inventors
- 👤 James A. Cole
- 👤 William O. Roberts
- 👤 Joseph T. Turgeon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:28
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C09; C09D; C09D5/00; C09D5/08
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
72 words
A process of protecting metal from white rust which comprises coating the metal with molten zinc or zinc alloy and subsequently directly contacting the zinc-coated metal at a metal temperature of at least 125° C. with a protective amount of a silica compound to form a chemically reacted coating with the zinc-coated metal, said silica compound being selected from the group consisting of sodium silicate, potassium silicate, an organic silicate, and silica.
Claim 2
Dependent Claim
72 words
A process of protecting metal from white rust which comprises coating the metal with molten zinc or zinc alloy and subsequently directly contacting the zinc-coated metal at a metal temperature of at least 125° C. with a protective amount of a silica compound to form a chemically reacted coating with the zinc-coated metal, said silica compound being selected from the group consisting of sodium silicate, potassium silicate, an organic silicate, and silica.
Claim 3
Dependent Claim
21 words
The process of claim 1 further characterized in that the silica compound comprises an aqueous solution of sodium and/or potassium silicate.
Claim 4
Dependent Claim
17 words
The process of claim 1 further characterized in that the silica compound comprises silica (SiO 2 ).
Claim 5
Dependent Claim
16 words
The process of claim 1 further characterized in that the silica compound is an organic silicate.
Claim 6
Dependent Claim
19 words
The process of claim 4 further characterized in that the organic silicate is a lower molecular weight alkyl silicate.
Claim 7
Dependent Claim
24 words
The process of claim 1 further characterized in that the temperature of heating the zinc-coated metal with the silica compound is above 150° C.
Claim 8
Dependent Claim
17 words
The process of claim 1 further characterized in that the silica compound is an alkali metal silicate.
Claim 9
Dependent Claim
16 words
The process of claim 7 further characterized in that the alkali metal silicate is potassium silicate.
Claim 10
Dependent Claim
81 words
A process for protecting metal from white rust which comprises coating the metal with molten zinc or a zinc alloy and subsequently directly contacting the zinc-coated metal at a metal temperature of at least 150° C. with a protective amount of an aqueous solution of an alkali metal silicate to form a chemically reacted coating with the zinc-coated metal, said aqueous solution of the alkali metal silicate comprising from about 0.1 to about 5.0% by weight of sodium and/or potassium silicate.
Claim 11
Dependent Claim
81 words
A process for protecting metal from white rust which comprises coating the metal with molten zinc or a zinc alloy and subsequently directly contacting the zinc-coated metal at a metal temperature of at least 150° C. with a protective amount of an aqueous solution of an alkali metal silicate to form a chemically reacted coating with the zinc-coated metal, said aqueous solution of the alkali metal silicate comprising from about 0.1 to about 5.0% by weight of sodium and/or potassium silicate.
Claim 12
Dependent Claim
23 words
A process according to claim 9, wherein the step of directly contacting the zinc-coated metal with said aqueous solution includes forming zinc-silicate complexes.
Claim 13
Dependent Claim
20 words
A process according to claim 10, wherein the process provides said white rust protection without the use of chromium compounds.
Claim 14
Dependent Claim
23 words
A process according to claim 1, wherein the step of directly contacting the zinc-coated metal with said silica compound includes forming zinc-silicate complexes.
Claim 15
Dependent Claim
20 words
A process according to claim 12, wherein the process provides said white rust protection without the use of chromium compounds.
Claim 16
Dependent Claim
76 words
A process for protecting metal from white rust without using chromium compounds comprising coating the metal with molten zinc or a zinc alloy to form a zinc-coated metal, and directly contacting the zinc-coated metal at a metal temperature of at least 125° C. with a silica compound to form a chemically reacted coating with the zinc-coated metal, said silica compound being selected from the group consisting of sodium silicate, potassium silicate, an organic silicate, and silica.
Claim 17
Dependent Claim
76 words
A process for protecting metal from white rust without using chromium compounds comprising coating the metal with molten zinc or a zinc alloy to form a zinc-coated metal, and directly contacting the zinc-coated metal at a metal temperature of at least 125° C. with a silica compound to form a chemically reacted coating with the zinc-coated metal, said silica compound being selected from the group consisting of sodium silicate, potassium silicate, an organic silicate, and silica.
Claim 18
Dependent Claim
19 words
A process according to claim 14, wherein said silica compound comprises an aqueous solution of sodium and/or potassium silicate.
Claim 19
Dependent Claim
25 words
A process according to claim 15, wherein said sodium and/or potassium silicate is present in an amount ranging from 0.1 to about 5.0% by weight.
Claim 20
Dependent Claim
18 words
A process according to claim 16, wherein said chemically reacted coating includes silicon ions in the zinc coating.
Claim 21
Dependent Claim
14 words
A process according to claim 16, wherein said chemically reacted coating includes zinc-silicate complexes.
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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) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |