US3907612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preanneal rinse process for inhibiting pin point rust
Assignee: Arkema Inc
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Filing: 1974-02-15
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Granted: 1975-09-23
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Expires: 1994-02-15
Abstract
Abstract This invention relates to a process for inhibiting the formation of pin point rust on steel sheets or strip which occurs during storage or in transit after annealing. According to our process, cold rolled steel is treated prior to annealing with a dilute aqueous rinse solution containing one or more particular water soluble chemical compounds. The rinse solution is dried on the steel prior to annealing to leave a residue of the chemical compound which inhibits rusting of the steel strip after annealing.
Inventors
- 👤 Thomas Clifford Atkiss
- 👤 William August Kirn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:21
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/68; C21D1/70; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/18; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
131 words
THE PROCESS FOR INHIBITING PIN POINT RUSTING OF COLD ROLLED ANNEALED STEEL COMPRISING CONTACTING ESSENTIALLY OF ONE ANNEALING WITH AN AQUEOUS RINSE SOLUTION CONSISTING ESSENTIALLY OF ONE OR MORE RUST INHIBITING COMPOUNDS AT A CONCENTRATION RANGING FROM ABOUT 5 GRAMS/LITER TO SATURATED SOLUTION AND SELECTED FROM THE GROUP CONSISTING OF: SODIUM TETRABORATE, AMMONIUM FLUOSILICATE, AMMONIUM FLUOTITANATE, CHROMIC ACETATE, AMMONIUM FLUOBORATE, AMMONIUM SILICO TUNGSTATE, PATASSIUM ACID PYRO ANTIMONATE, AMMONIUM MOLYBDATE, MONOBASIC ALUMINIUM FORMATE, ANTIOXY TRIFLUORIDE, AMMONIUM METATUNGSTATE, ANTIMONY OXALATE, AMMONIUM TITANIUM FLUORIDE, SILICON METATUNGSTATE, ZINC FLUOBORATE, TIN FLUOBORATE, AND TRIPHENYL ANITOMY TO WET THE STEEL WITH RINSE SOLUTION, DRYING THE WETTED STEEL TO LEAVE A RESIDUE OF RUST INHIBITING COMPOUND ON THE STEEL, AND FINALLY ANNEALING THE STEEL IN A PROTECTIVE GAS ATMOSPHERE AT A TEMPERATURE OF ABOUT 1100* TO ABOUT 1300*F.
Claim 2
Dependent Claim
131 words
THE PROCESS FOR INHIBITING PIN POINT RUSTING OF COLD ROLLED ANNEALED STEEL COMPRISING CONTACTING ESSENTIALLY OF ONE ANNEALING WITH AN AQUEOUS RINSE SOLUTION CONSISTING ESSENTIALLY OF ONE OR MORE RUST INHIBITING COMPOUNDS AT A CONCENTRATION RANGING FROM ABOUT 5 GRAMS/LITER TO SATURATED SOLUTION AND SELECTED FROM THE GROUP CONSISTING OF: SODIUM TETRABORATE, AMMONIUM FLUOSILICATE, AMMONIUM FLUOTITANATE, CHROMIC ACETATE, AMMONIUM FLUOBORATE, AMMONIUM SILICO TUNGSTATE, PATASSIUM ACID PYRO ANTIMONATE, AMMONIUM MOLYBDATE, MONOBASIC ALUMINIUM FORMATE, ANTIOXY TRIFLUORIDE, AMMONIUM METATUNGSTATE, ANTIMONY OXALATE, AMMONIUM TITANIUM FLUORIDE, SILICON METATUNGSTATE, ZINC FLUOBORATE, TIN FLUOBORATE, AND TRIPHENYL ANITOMY TO WET THE STEEL WITH RINSE SOLUTION, DRYING THE WETTED STEEL TO LEAVE A RESIDUE OF RUST INHIBITING COMPOUND ON THE STEEL, AND FINALLY ANNEALING THE STEEL IN A PROTECTIVE GAS ATMOSPHERE AT A TEMPERATURE OF ABOUT 1100* TO ABOUT 1300*F.
Claim 3
Dependent Claim
24 words
The process of claim 1 in which the steel is cleaned prior to contacting it with the aqueous solution of the rust inhibiting compound.
Claim 4
Dependent Claim
108 words
The process for inhibiting pin point rusting of cold rolled annealed steel comprising contacting the steel prior to annealing with an aqueous rinse solution consisting essentially of one or more rust inhibiting compounds at a concentration ranging from about 5 grams/liter to saturated solution and selected from the group of antimony compounds consisting of: antimony acetate, potassium acid pyro-antimonate, triphenyl antimony, antimony trifluoride, and antimony oxalate to wet the steel with rinse solution, drying the wetted steel to leave a residue of rust inhibiting antimony compound on the steel and finally annealing the steel in a protective gas atmosphere at a temperature of about 1100* to about 1300*F.
Claim 5
Dependent Claim
108 words
The process for inhibiting pin point rusting of cold rolled annealed steel comprising contacting the steel prior to annealing with an aqueous rinse solution consisting essentially of one or more rust inhibiting compounds at a concentration ranging from about 5 grams/liter to saturated solution and selected from the group of antimony compounds consisting of: antimony acetate, potassium acid pyro-antimonate, triphenyl antimony, antimony trifluoride, and antimony oxalate to wet the steel with rinse solution, drying the wetted steel to leave a residue of rust inhibiting antimony compound on the steel and finally annealing the steel in a protective gas atmosphere at a temperature of about 1100* to about 1300*F.
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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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |