US3887449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating method and composition for the sacrificial protection of metal substrates
Assignee: Chromalloy American Corp
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Filing: 1973-05-21
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Granted: 1975-06-03
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Expires: 1993-05-21
Abstract
Abstract A coating method and coating composition are provided for the sacrificial protection of metal substrates, e.g., magnesium and magnesium alloys, wherein the coating bonded to the metal substrate comprises a non-metallic adhesive material, such as an epoxy resin, having dispersed therethrough a powdered alloy composition which is electropositive to the metal substrate, said coating composition being electrically conductive relative to said metal substrate.
Inventors
- 👤 Robert B Baer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:51
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C09; C09D; C09D5/00; C09D5/24; C25; C25D; C25D11/00; C25D11/02; C25D11/30; Y; Y10; Y10S; Y10S205/00; Y10S205/917
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
185 words
A METHOD FOR THE SACRIFICIAL PROTECTION OF A METAL SUBSTRATE SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM AND MAGNESIUM ALLOYS WHICH COMPRISES: ANODIZING SAID METAL SUBSTRATE TO FORM AN ADHERENT OXIDE FILM THEREON, APPLYING TO SAID ANODIZED FILM A FIRST PROTECTIVE COATING OF A DOUBLE SALT SELECTED FROM THE GROUP CONSISTING OF BARIUM POTASSIUM CHROMATE AND CALCIUM POTASSIUM CHROMATE DISPERSED THROUGH A CURABLE ADHESIVE AND BONDING SAID COATING TO SAID ANODIZED FILM BY CURING SAID ADHESIVE, PROVIDING A SECOND PROTECTIVE COATING MATERIAL COMPRISING A CURABLE ADHESIVE HAVING DISPERSED THERETHROUGH A POWDERED ALLOY COMPOSITION WHICH IS ELECTROPOSITIVE RELATIVE TO SAID METAL SUBSTRATE; SAID SECOND COATING MATERIAL BEING ELECTRICALLY CONDUCTIVE RELATIVE TO SAID METAL SUBSTRATE, SAID POWDERED ALLOY COMPOSITION COMPRISING BY WEIGHT ABOUT 5 TO 60 PERCENT OF A CALCIUM GROUP METAL SELECTED FROM THE GROUP CONSISTING OF STRONTIUM, BARIUM AND CALCIUM, 0 TO ABOUT 20 PERCENT ALUMINUM AND THE BALANCE SUBSTANTIALLY MAGENESIUM RANGING FROM ABOUT 40 TO 95 PERCENT, AND APPLYING AND CURING A LAYER OF SAID SECOND COATING MATERIAL TO SAID FIRST PROTECTIVE COATING, SAID SECOND PROTECTIVE COATING BEING SACRIFICAL RELATIVE TO SAID METAL SUBSTRATE.
Claim 2
Independent Claim
185 words
A METHOD FOR THE SACRIFICIAL PROTECTION OF A METAL SUBSTRATE SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM AND MAGNESIUM ALLOYS WHICH COMPRISES: ANODIZING SAID METAL SUBSTRATE TO FORM AN ADHERENT OXIDE FILM THEREON, APPLYING TO SAID ANODIZED FILM A FIRST PROTECTIVE COATING OF A DOUBLE SALT SELECTED FROM THE GROUP CONSISTING OF BARIUM POTASSIUM CHROMATE AND CALCIUM POTASSIUM CHROMATE DISPERSED THROUGH A CURABLE ADHESIVE AND BONDING SAID COATING TO SAID ANODIZED FILM BY CURING SAID ADHESIVE, PROVIDING A SECOND PROTECTIVE COATING MATERIAL COMPRISING A CURABLE ADHESIVE HAVING DISPERSED THERETHROUGH A POWDERED ALLOY COMPOSITION WHICH IS ELECTROPOSITIVE RELATIVE TO SAID METAL SUBSTRATE; SAID SECOND COATING MATERIAL BEING ELECTRICALLY CONDUCTIVE RELATIVE TO SAID METAL SUBSTRATE, SAID POWDERED ALLOY COMPOSITION COMPRISING BY WEIGHT ABOUT 5 TO 60 PERCENT OF A CALCIUM GROUP METAL SELECTED FROM THE GROUP CONSISTING OF STRONTIUM, BARIUM AND CALCIUM, 0 TO ABOUT 20 PERCENT ALUMINUM AND THE BALANCE SUBSTANTIALLY MAGENESIUM RANGING FROM ABOUT 40 TO 95 PERCENT, AND APPLYING AND CURING A LAYER OF SAID SECOND COATING MATERIAL TO SAID FIRST PROTECTIVE COATING, SAID SECOND PROTECTIVE COATING BEING SACRIFICAL RELATIVE TO SAID METAL SUBSTRATE.
Claim 3
Independent Claim
185 words
A method for the sacrificial protection of a metal substrate selected from the group consisting of magnesium and magnesium alloys which comprises, anodizing said metal substrate to form an adherent oxide film thereon, applying to said anodized film a first protective coating of a double salt selected from the group consisting of barium potassium chromate and calcium potassium chromate dispersed through a curable adhesive and bonding said coating to said anodized film by curing said adhesive, providing a second protective coating material comprising a curable adhesive having dispersed therethrough a powdered alloy composition which is electropositive relative to said metal substrate, said second coating material being electrically conductive relative to said metal substrate, said powdered alloy composition comprising by weight about 5 to 60 percent of a calcium group metal selected from the group consisting of strontium, barium and calcium, 0 to about 20 percent aluminum and the balance substantially magnesium ranging from about 40 to 95 percent, and applying and curing a layer of said second coating material to said first protective coating, said second protective coating being sacrificial relative to said metal substrate.
Claim 4
Independent Claim
185 words
A method for the sacrificial protection of a metal substrate selected from the group consisting of magnesium and magnesium alloys which comprises, anodizing said metal substrate to form an adherent oxide film thereon, applying to said anodized film a first protective coating of a double salt selected from the group consisting of barium potassium chromate and calcium potassium chromate dispersed through a curable adhesive and bonding said coating to said anodized film by curing said adhesive, providing a second protective coating material comprising a curable adhesive having dispersed therethrough a powdered alloy composition which is electropositive relative to said metal substrate, said second coating material being electrically conductive relative to said metal substrate, said powdered alloy composition comprising by weight about 5 to 60 percent of a calcium group metal selected from the group consisting of strontium, barium and calcium, 0 to about 20 percent aluminum and the balance substantially magnesium ranging from about 40 to 95 percent, and applying and curing a layer of said second coating material to said first protective coating, said second protective coating being sacrificial relative to said metal substrate.
Claim 5
Dependent Claim
25 words
The method of claim 1, wherein the amount of powdered alloy in the second coating material ranges from about 10 to 50 percent by weight.
Claim 6
Dependent Claim
29 words
The method of claim 2, wherein said powdered alloy dispersed in said second coating material contains by weight from about 15 to 40 percent of said calcium group metal.
Claim 7
Dependent Claim
30 words
The method of claim 2, wherein said curable material through which the powdered alloy is dispersed is selected from the group consisting of alkali metal silicates and curable plastic adhesives.
Claim 8
Dependent Claim
43 words
The method of claim 2, wherein the electrical conductivity of said second coating material is augmented through the additional dispersion therein of a finely divided electrically conductive material ranging in amount from about 0.5 to 20 percent by weight of the coating material.
Claim 9
Dependent Claim
151 words
A composite article of manufacture which comprises: a metal substrate selected from the group consisting of magnesium and magnesium alloys, said metal substrate having an adherent anodized film thereon, a first protective coating of a double salt selected from the group consisting of barium potassium chromate and calcium potassium chromate dispersed through a cured adhesive bonded to said anodized film, and a second protective coating bonded to said coating of double salt comprising a cured adhesive material having a powdered alloy dispersed substantially uniformly therethrough, said powdered alloy being electropositive relative to said substrate metal and having a composition comprising about 5 to 60 percent of a calcium group metal selected from the group consisting of strontium, barium and calcium, 0 to 20 percent aluminum and the balance substantially magnesium ranging from about 40 to 95 percent, said second protective coating being electrically conductive and sacrificial relative to said metal substrate.
Claim 10
Dependent Claim
151 words
A composite article of manufacture which comprises: a metal substrate selected from the group consisting of magnesium and magnesium alloys, said metal substrate having an adherent anodized film thereon, a first protective coating of a double salt selected from the group consisting of barium potassium chromate and calcium potassium chromate dispersed through a cured adhesive bonded to said anodized film, and a second protective coating bonded to said coating of double salt comprising a cured adhesive material having a powdered alloy dispersed substantially uniformly therethrough, said powdered alloy being electropositive relative to said substrate metal and having a composition comprising about 5 to 60 percent of a calcium group metal selected from the group consisting of strontium, barium and calcium, 0 to 20 percent aluminum and the balance substantially magnesium ranging from about 40 to 95 percent, said second protective coating being electrically conductive and sacrificial relative to said metal substrate.
Claim 11
Dependent Claim
28 words
The composite article of manufacture of claim 6, wherein the amount of powdered alloy in said second protective coating ranges from about 10 to 50 percent by weight.
Claim 12
Dependent Claim
31 words
The composite article of manufacture of claim 7, wherein said powdered alloy dispersed in said second protective coating contains by weight about 15 to 40 percent of said calcium group metal.
Claim 13
Dependent Claim
31 words
The composite article of manufacture of claim 6, wherein the adhesive mAterial of said second protective coating is selected from the group consisting of alkali metal silicates and curable plastic adhesives.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |