US3718509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated metal and method
Assignee: Diamond Shamrock Corp
•
Filing: 1971-02-03
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Granted: 1973-02-27
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Expires: 1991-02-03
Abstract
Abstract A composite coating provides enhanced corrosion protection for metal substrates, can maintain weldability where otherwise desirable and provide a surface for receiving electrocoat paint. The undercoating on the surface of the substrate is the residue obtained from heating an applied corrosion-resistant, hexavalentchromium-containing coating composition, which residue is in intimate mixture with pulverulent metal. The coating over such residue results form curing an applied topcoat composition comprising additional hexavalent-chromium-containing coating composition.
Inventors
- 👤 V Germano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:01
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73; C23C22/74; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12069
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
96 words
a topcoating on said undercoating which topcoating is a substantially resin-free and pulverulent-metal-free coating comprising not substantially above about 500 milligrams per square foot of chromium in a coated metal substrate residue from a hexavalent-chromium-containing coating composition for metal substrates, said composition further supplying said residue with above about 5 milligrams per square foot of coated metal substrate of chromium; wherein the residue of said undercoating and the residue of said topcoating are established by heating said substrate at a temperature, and for a period of time, sufficient to vaporize volatile substituents from said coating compositions.
Claim 2
Dependent Claim
40 words
The coated metal substrate of claim 1 wherein said pulverulent metal has an average particle size not substantially above about 100 mesh and is present on said surface in an amount not substantially above about 5,000 milligrams per square foot.
Claim 3
Dependent Claim
51 words
coating on the resulting treated metal surface a substantially resin-free and pulverulent-metal-free topcoat composition comprising the residue from a hexavalent-chromium-containing coating composition for metal substrates and providing above about 5, to not substantially above about 25 milligrams per square foot of coated metal substrate of chromium in said topcoat composition; and
Claim 4
Dependent Claim
51 words
coating on the resulting treated metal surface a substantially resin-free and pulverulent-metal-free topcoat composition comprising the residue from a hexavalent-chromium-containing coating composition for metal substrates and providing above about 5, to not substantially above about 25 milligrams per square foot of coated metal substrate of chromium in said topcoat composition; and,
Claim 5
Dependent Claim
51 words
coating on the resulting treated metal surface a substantially resin-free and pulverulent-metal-free topcoat composition comprising the residue from a hexavalent-chromium-containing coating composition for metal substrates and providing above about 5, to not substantially above about 25, milligrams per square foot of coated metal substrate of chromium in said topcoat composition; and,
Claim 6
Dependent Claim
51 words
coating on the resulting treated metal surface a substantially resin-free and pulverulent-metal-free topcoat composition comprising the residue from a hexavalent-chromium-containing coating composition for metal substrates and providing above about 5, to not substantially above about 25, milligrams per square foot of coated metal substrate of chromium in said topcoat composition; and,
Claim 7
Dependent Claim
62 words
providing said surface with at least about 10 milligrams per square foot of coated substrate of pulverulent metal selected from the group consisting of zinc, manganese, aluminum, magnEsium, mixtures thereof, and alloys of same, while permitting the coated substrate to dry and thereby establish a dry, intermediate coated substrate of an intimate mixture of said pulverulent metal and dry coating composition residue;
Claim 8
Dependent Claim
51 words
coating on the resulting treated metal surface a substantially resin-free and pulverulent-metal-free topcoat composition comprising the residue from a hexavalent-chromium-containing coating composition for metal substrates and providing above about 5, to not substantially above about 25 milligrams per square foot of coated metal substrate of chromium in said topcoat composition; and
Claim 9
Dependent Claim
19 words
curing said topcoat composition thereby preparing said substrate for welding with a coating providing corrosion resistance and weldable electroconductivity;
Claim 10
Dependent Claim
43 words
applying to the resulting coated surface a substantially resin-free and pulverulent-metal-free hexavalent-chromium-containing coating composition for metal substrates in an amount sufficient to provide a composition residue containing from about 5, to not substantially above about 500, milligrams per square foot of chromium; and
Claim 11
Dependent Claim
19 words
curing said topcoat composition thereby preparing said substrate for welding with a coating providing corrosion resistance and weldable electroconductivity.
Claim 12
Dependent Claim
19 words
curing said topcoat composition thereby preparing said substrate for welding with a coating providing corrosion resistance and weldable electroconductivity;
Claim 13
Dependent Claim
17 words
curing said topcoat composition thereby preparing an electroconductive, coated substrate for receiving deposition of electrocoat paint thereon.
Claim 14
Dependent Claim
61 words
The coated metal substrate of claim 1 wherein said residue of said undercoating and said residue of said topcoating are each the residue remaining after heating an applied hexavalent-chromium-containing coating composition containing between about 0.25-50 weight percent of hexavalent chromium expressed as CrO3 at a temperature not substantially above about 300*C. and for a time of at least about 2 seconds.
Claim 15
Dependent Claim
17 words
curing said topcoat composition thereby preparing an electroconductive, coated substrate for receiving deposition of electrocoat paint thereon;
Claim 16
Dependent Claim
21 words
immersing into a bath of electrocoat paint containing an electrode the resulting treated surface and preparing same as an electrode; and
Claim 17
Dependent Claim
24 words
The coated metal substrate of claim 1 wherein said undercoating contains a weight ratio of chromium to pulverulent metal not substantially above about 0.5:1.
Claim 18
Dependent Claim
17 words
contacting at least a portion of said one article with another article of metal to be welded;
Claim 19
Dependent Claim
30 words
heating said substrate at a temperature, and for a period of time, sufficient to vaporize volatile substituents from applied coating composition and deposit on said surface a heated composition residue.
Claim 20
Dependent Claim
20 words
contacting at least a portion of the article having the prepared substrate with another article of metal to be welded;
Claim 21
Dependent Claim
22 words
passing an electrical resistance welding current through said articles of metal and said coating thereon at the zone selected for welding; and
Claim 22
Independent Claim
22 words
The method of preparing a coated metal substrate having an adherent, corrosion-resistant coating at the surface of said substrate which method comprises:
Claim 23
Dependent Claim
6 words
electrolyzing said bath of electrocoat paint.
Claim 24
Dependent Claim
37 words
passing an electrical resistance welding current through said articles of metal and said coating thereon at the zone selected for welding, and fusing said articles together at said zone of welding, thereby forming said welded metal assembly.
Claim 25
Dependent Claim
20 words
immersing into a bath of electrocoat paint containing an electrode the resulting assembly and preparing same as an electrode; and
Claim 26
Dependent Claim
10 words
fusing said articles together in said zone of said welding.
Claim 27
Dependent Claim
41 words
The method of claim 5 wherein said pulverulent metal is applied to said surface as a dispersion of said metal in volatile liquid and said dispersion is applied to the surface after the application of said coating composition in step (1).
Claim 28
Dependent Claim
55 words
The method of claim 5 wherein said pulverulent metal is applied to said surface along with the application of said coating composition in step (1) and said dry, intermediate coated substrate is established by heating said substrate at a temperature not substantially above about 300*C. and for a time of at least about 2 seconds.
Claim 29
Dependent Claim
6 words
electrolyzing said bath of electrocoat paint.
Claim 30
Dependent Claim
50 words
The method of claim 5 wherein said pulverulent metal is applied as a dry powder to said surface, said metal is applied prior to the application of said coating composition in step (1), and said dry, intermediate coated substrate is established without heating sufficient to prepare a heated composition residue.
Claim 31
Dependent Claim
39 words
The method of claim 5 wherein said providing of pulverulent metal and said application of coating composition of step (1) provide a dry intermediate coating containing a weight ratio of chromium to pulverulent metal not substantially above about 0.5:
Claim 32
Independent Claim
19 words
The method of preparing a weldable substrate for electrical resistance welding and having desirable corrosion resistance, which method comprises:
Claim 33
Dependent Claim
51 words
The method of claim 10 wherein said treated metal surface is at least in part established by drying said substrate and said substrate after establishing said topcoat composition thereon is heated at a temperature not substantially in excess of about 300*C. and for a time of at least about 2 seconds.
Claim 34
Dependent Claim
16 words
A weldable metal substrate prepared for electrical resistance welding according to the method of claim 10.
Claim 35
Independent Claim
20 words
The method of preparing a coated and welded metallic article, wherein the welding is electrical resistance welding which method comprises:
Claim 36
Dependent Claim
11 words
A welded article prepared according to the method of claim 13.
Claim 37
Independent Claim
16 words
The method of preparing a substrate for receiving a deposition of electrocoat paint, which method comprises:
Claim 38
Independent Claim
31 words
The method of preparing an article having a coating of electrocoat paint, wherein the substrate surface of the article is treated to receive the deposition of said paint, which method comprises:
Claim 39
Dependent Claim
10 words
An electrocoated article prepared by the process of claim 16.
Claim 40
Independent Claim
18 words
The method of preparing a corrosion resistant, welded metal assembly having an electrocoat painted surface, which method comprises:
Claim 41
Dependent Claim
12 words
A welded and electrocoated assembly prepared by the process of claim 18.
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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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |