US3874883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibiting pigment and method of making same
Assignee: Cyprus Amax Minerals Co
•
Filing: 1973-06-18
•
Granted: 1975-04-01
•
Expires: 1993-06-18
Abstract
Abstract A method for preparing an extended corrosion inhibiting pigment for use in formulating protective coatings for ferrous substrates in which a particulated carrier comprised of a carbonate of zinc, calcium, strontium and/or barium is slurred in an acidic aqueous solution in the presence of molybdic oxide in a manner to cause a reaction to occur between the molybdate ions and the metallic ions on the surface of the carrier particles forming a chemically bonded coating of the corresponding metal molybdate on the unreacted core of the carrier particles, whereafter the coated carrier is separated and dried.
Inventors
- 👤 Dennis R Robitaille
- 👤 Mark S Vukasovich
- 👤 Henry F Barry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:29
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0003; C09C3/00; C09C3/06; C09C3/063; C09D; C09D5/00; C09D5/08; C09D5/082; C09D5/084; C01; C01P; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
204 words
A METHOD FOR MAKING AN EXTENDED CORROSION INHIBITING PIGMENT WHICH COMPRISES THE STEPS OF FORMING A SLURRY BY DISPERSING A PARTICULATED METAL CARBONATE CARRIER SELECTED FROM THE GROUP CONSISTING OF ZINC CARBONATE, CALCIUM CARBONATE, STRONTIUM CARBONATE, BARIUM CARBONATE AND MIXTURES THEREOF IN AN AQUEOUS MEDIUM, DISPERSING PARTICULATED MOLYBDENIUM OXIDE IN SAID SLURRY IN A MANNER TO EFFECT A PROGRESSIVE DISSOLUTION THEREOF TO PRODUCE SOLUTION SOLUBLE MOLYBDATE IONS AND A PROGRESSIVE DISSOLUTION OF THE SURFACES OF THE METAL CARBONATE CARRIER PARTICLES TO PRODUCE SOLUTION SOLUBLE CORRESPONDING METAL IONS, SAID METAL CARBONATE CARRIER PRESENT IN AN AMOUNT STOICHIOMETRICALLY EXCESS OF THE SOLUBLE MOLYBDATE IONS PRESENT TO PROVIDE RESIDUAL UNREACTED CORES OF SOLID PARTICULATED CARRIER AND TO PROVIDE AN ACIDIC AQUEOUS REACTION MEDIUM HAVING A PH LESS THAN ABOUT 6, REACTING SAID MOLYBDATE IONS AND SAID METAL IONS TO PRODUCE SOLUTION INSOLUBLE METAL MOLYBDATE COMPOUNDS AS AN ADHERENT COATING ON THE SURFACES OF SAID PARTICULATED CARRIER, CONTINUING THE REACTION UNTIL THE DESIRED QUANTITY OF SAID COATING HAS BEEN DEPOSITED ON THE UNREACTED CORES OF SAID PARTICULATED CARRIER, SEPARATING THE COATED SAID CARRIER FROM SAID SOLUTION, AND THEREAFTER DRYING THE COATED SAID CARRIER FOR A PERIOD OF TIME SUFFICIENT TO REMOVE SUBSTANTIALLY ALL OF THE ENTRAINED MOISTURE THEREIN.
Claim 2
Independent Claim
204 words
A METHOD FOR MAKING AN EXTENDED CORROSION INHIBITING PIGMENT WHICH COMPRISES THE STEPS OF FORMING A SLURRY BY DISPERSING A PARTICULATED METAL CARBONATE CARRIER SELECTED FROM THE GROUP CONSISTING OF ZINC CARBONATE, CALCIUM CARBONATE, STRONTIUM CARBONATE, BARIUM CARBONATE AND MIXTURES THEREOF IN AN AQUEOUS MEDIUM, DISPERSING PARTICULATED MOLYBDENIUM OXIDE IN SAID SLURRY IN A MANNER TO EFFECT A PROGRESSIVE DISSOLUTION THEREOF TO PRODUCE SOLUTION SOLUBLE MOLYBDATE IONS AND A PROGRESSIVE DISSOLUTION OF THE SURFACES OF THE METAL CARBONATE CARRIER PARTICLES TO PRODUCE SOLUTION SOLUBLE CORRESPONDING METAL IONS, SAID METAL CARBONATE CARRIER PRESENT IN AN AMOUNT STOICHIOMETRICALLY EXCESS OF THE SOLUBLE MOLYBDATE IONS PRESENT TO PROVIDE RESIDUAL UNREACTED CORES OF SOLID PARTICULATED CARRIER AND TO PROVIDE AN ACIDIC AQUEOUS REACTION MEDIUM HAVING A PH LESS THAN ABOUT 6, REACTING SAID MOLYBDATE IONS AND SAID METAL IONS TO PRODUCE SOLUTION INSOLUBLE METAL MOLYBDATE COMPOUNDS AS AN ADHERENT COATING ON THE SURFACES OF SAID PARTICULATED CARRIER, CONTINUING THE REACTION UNTIL THE DESIRED QUANTITY OF SAID COATING HAS BEEN DEPOSITED ON THE UNREACTED CORES OF SAID PARTICULATED CARRIER, SEPARATING THE COATED SAID CARRIER FROM SAID SOLUTION, AND THEREAFTER DRYING THE COATED SAID CARRIER FOR A PERIOD OF TIME SUFFICIENT TO REMOVE SUBSTANTIALLY ALL OF THE ENTRAINED MOISTURE THEREIN.
Claim 3
Dependent Claim
34 words
The method as defined in claim 1, including the further step of heating said aqueous solution and maintaining the temperature thereof within a range of from about 60*C to about 90*C during said reaction.
Claim 4
Dependent Claim
37 words
The method as defined in claim 1, including the further step of vigorously agitating said aqueous solution during said reaction to maintain a substantially uniform suspension of said particulated carrier and said molybdenum oxide in said solution.
Claim 5
Dependent Claim
35 words
The method as defined in claim 1, including the further step of suspending said molybdic oxide in water to form a slurry and thereafter introducing said slurry into said aqueous solution containing said particulated carrier.
Claim 6
Dependent Claim
75 words
The method as defined in claim 1, wherein the coated said carrier is subjected to a preliminary drying step after separation from said solution to remove the predominant quantity of water therefrom whereafter the dried and coated said carrier is milled to eliminate any agglomerates therein whereafter the dried, coated and milled said carrier is calcined at an elevated temperature for a period of time sufficient to remove any residual water and water of hydration.
Claim 7
Dependent Claim
39 words
The method as defined in claim 1, wherein the reaction is carried out to deposit from about 2% up to about 30% of said metal molybdate compounds on said particulated carrier based on the total weight of said pigment.
Claim 8
Dependent Claim
30 words
The method as defined in claim 1, including the further step of calcining the dried coated said carrier at an elevated temperature of from about 350*C up to about 600*C.
Claim 9
Dependent Claim
70 words
The method as defined in claim 1, including the further step of dispersing a particulated metal oxide selected from the group consisting of zinc oxide, calcium oxide, strontium oxide, barium oxide and mixtures thereof, in said aqueous solution for admixture with said carrier and entrapment in said coating thereon, said metal oxide present in an amount of about 0.5% to about 10% based on the total weight of said pigment.
Claim 10
Dependent Claim
26 words
The method as defined in claim 1, wherein said particulated carrier is of an average particle size ranging from about 0.1 micron to about 20 microns.
Claim 11
Dependent Claim
14 words
A corrosion inhibiting molybdate pigment prepared by the process as defined in claim 1.
References Cited (Backward Citations)
US3353979A
Cited
US3726694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |