US3860438A
Expired / Lapsed
US
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Flux and method of coating ferrous article
Assignee: BIEC INTERNATIONAL Inc A CORP OF DE
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Filing: 1974-03-11
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Granted: 1975-01-14
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Expires: 1994-03-11
Abstract
Abstract This invention relates to the process of coating ferrous articles by the molten metal immersion method, more particularly to the provision of an aqueous flux applied to said article prior to the metal coating thereof. Specifically, the process includes cleaning the ferrous article, wetting the surfaces with an aqueous flux consisting essentially of potassium fluosilicate, hydrofluoric acid, potassium fluoride and optionally zinc chloride, drying said flux on the surface, immersing said article in a molten metal bath consisting essentially of at least 25% by weight aluminum, balance essentially zinc, and after removal from the bath, shaking off excess metal and cooling to yield a ferrous article having a continuous, adherent and uniform layer of said aluminum-zinc alloy.
Inventors
- 👤 Carlyle E Shoemaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:45
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/04; C23C2/12; C23C2/06; C23C2/30
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
112 words
A METHOD OF FORMING A CONTINUOUS ALLOY COATING CONSISTING OF FROM 25% TO ABOUT 70%, BY WEIGHT ALUMINUM, BALANCE ESSENTIALLY ZINC, ON A FERROUS ARTICLE, COMPRISING THE STEPS OF CLEANING SAID FERROUS ARTICLE TO REMOVE GREASE AND OXIDES FROM THE SURFACES THEREOF TO BE COATED, IMMERSING SAID ARTICLE IN AN AQUEOUS FLUX CONSISTING ESSENTIALLY OF POTASSIUM FLUOSILICATE, POTASSIUM FLUORIDE, ZINC CHLORIDE, AND AN ACID SELECTED FROM THE GROUP CONSISTING OF HYDROFLUORIC ACID AND A MIXTURE OF HYDROFLUORIC ACID AND HYDROCHLORIC ACID, REMOVING SAID ARTICLE FROM THE AQUEOUS FLUX, DRYING SAID ARTICLE BY HEATING TO A LOW TEMPERATURE, AND IMMERSING THE ARTICLE IN A MOLTEN BATH CONTAINING SAID ALIMINUM - ZINC COATING ALLOY.
Claim 2
Independent Claim
112 words
A METHOD OF FORMING A CONTINUOUS ALLOY COATING CONSISTING OF FROM 25% TO ABOUT 70%, BY WEIGHT ALUMINUM, BALANCE ESSENTIALLY ZINC, ON A FERROUS ARTICLE, COMPRISING THE STEPS OF CLEANING SAID FERROUS ARTICLE TO REMOVE GREASE AND OXIDES FROM THE SURFACES THEREOF TO BE COATED, IMMERSING SAID ARTICLE IN AN AQUEOUS FLUX CONSISTING ESSENTIALLY OF POTASSIUM FLUOSILICATE, POTASSIUM FLUORIDE, ZINC CHLORIDE, AND AN ACID SELECTED FROM THE GROUP CONSISTING OF HYDROFLUORIC ACID AND A MIXTURE OF HYDROFLUORIC ACID AND HYDROCHLORIC ACID, REMOVING SAID ARTICLE FROM THE AQUEOUS FLUX, DRYING SAID ARTICLE BY HEATING TO A LOW TEMPERATURE, AND IMMERSING THE ARTICLE IN A MOLTEN BATH CONTAINING SAID ALIMINUM - ZINC COATING ALLOY.
Claim 3
Dependent Claim
40 words
The method according to claim 1 wherein said aqueous flux, per 100 mls, comprises 3 to 40 gms. potassium fluosilicate, 2.6 to 9.0 gms. potassium fluoride, 3 to 50 mls. hydrofluoric acid, up to 5 gms. zinc chloride, balance water.
Claim 4
Dependent Claim
32 words
The method according to claim 2 wherein said acid is a mixture of hydrochloric acid and hydrofluoric acid, the quantity of the hydrochloric acid does not exceed 30% of the hydrofluoric acid.
Claim 5
Dependent Claim
40 words
The method according to claim 2 wherein said aqueous flux, per 100 mls., comprises 7 to 13 gms. potassium fluosilicate, 3 to 7 gms. potassium fluoride, 5 to 11 mls. hydrofluoric acid, 1 to 3 gms. zinc chloride, balance water.
Claim 6
Dependent Claim
32 words
The method according to claim 4 wherein said acid is a mixture of hydrochloric acid and hydrofluoric acid, the quantity of the hydrochloric acid does not exceed 30% of the hydrofluoric acid.
Claim 7
Dependent Claim
34 words
The method according to claim 1 wherein said aqueous flux, per 100 mls, comprises 7 to 13 gms. potassium fluosilicate, 3 to 7 gms. potassium fluoride, 5 to 11 mls. hydrofluoric acid, balance water.
Claim 8
Dependent Claim
55 words
A flux for the treatment of a ferrous article prior to its immersion in a molten bath containing an aluminum-zinc alloy, comprising an aqueous acidic solution consisting essentially of potassium fluosilicate, potassium fluoride, fluoride chloride, and an acid selected from the group consisting of hydrofluoric acid and a mixture of hydrofluoric acid and hydrochloric acid.
Claim 9
Dependent Claim
55 words
A flux for the treatment of a ferrous article prior to its immersion in a molten bath containing an aluminum-zinc alloy, comprising an aqueous acidic solution consisting essentially of potassium fluosilicate, potassium fluoride, fluoride chloride, and an acid selected from the group consisting of hydrofluoric acid and a mixture of hydrofluoric acid and hydrochloric acid.
Claim 10
Dependent Claim
41 words
The flux according to claim 7 wherein said aqueous acidic solution, per 100 mls, comprises 3 to 40 gms. potassium fluosilicate, 2.6 to 9.0 gms. potassium fluoride, 3 to 50 mls. hydrofluoric acid, up to 5 jms. zinc chloride, balance water.
Claim 11
Dependent Claim
32 words
The flux according to claim 8 wherein said acid is a mixture of hydrochloric acid and hydrofluoric acid, the quantity of the hydrochloric acid does not exceed 30% of the hydrofluoric acid.
Claim 12
Dependent Claim
41 words
The flux according to claim 8 wherein said aqueous acidic solution, per 100 mls, comprises 7 to 13 gms. potassium fluosilicate, 3 to 7 gms. potassium fluoride, 5 to 11 mls. hydrofluoric acid, 1 to 3 gms. zinc chloride, balance water.
Claim 13
Dependent Claim
32 words
The flux according to claim 10 wherein said acid is a mixture of hydrochloric acid and hydrofluoric acid, tHe quantity of the hydrochloric acid does not exceed 30% of the hydrofluoric acid.
Claim 14
Dependent Claim
35 words
The flux according to claim 14 wherein said aqueous acidic solution, per 100 mls, comprises 7 to 13 gms. potassium fluosilicate, 3 to 17 gms. potassium fluoride, 5 to 11 mls. hydrofluoric acid, balance water.
Claim 15
Independent Claim
19 words
A METHOD OF FORMING A CONTINUOUS ALLOY COATING CONSISTING OF FROM 25% TO ABOUT 70%, BY WEIGHT ALUMINUM, BALANCE
Claim 16
Independent Claim
19 words
A METHOD OF FORMING A CONTINUOUS ALLOY COATING CONSISTING OF FROM 25% TO ABOUT 70%, BY WEIGHT ALUMINUM, BALANCE
Claim 17
Dependent Claim
53 words
A flux for the treatment of a ferrous article prior to its immersion in a molten bath containing an aluminum-zinc alloy, comprising an aqueous acidic solution consisting essentially of potassium fluosilicate potassium fluoride and an acid selected from the group consisting of hydrofluoric acid and a mixture of hydrofluoric acid and hydrochloric acid.
Claim 18
Dependent Claim
53 words
A flux for the treatment of a ferrous article prior to its immersion in a molten bath containing an aluminum-zinc alloy, comprising an aqueous acidic solution consisting essentially of potassium fluosilicate potassium fluoride and an acid selected from the group consisting of hydrofluoric acid and a mixture of hydrofluoric acid and hydrochloric acid.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |