US3806356A - Flux and method of coating ferrous article - Google Patents
Flux and method of coating ferrous article Download PDFInfo
- Publication number
- US3806356A US3806356A US00275610A US27561072A US3806356A US 3806356 A US3806356 A US 3806356A US 00275610 A US00275610 A US 00275610A US 27561072 A US27561072 A US 27561072A US 3806356 A US3806356 A US 3806356A
- Authority
- US
- United States
- Prior art keywords
- flux
- article
- coating
- ferrous
- metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 title abstract description 30
- 238000000576 coating method Methods 0.000 title abstract description 26
- 230000004907 flux Effects 0.000 title abstract description 26
- 239000011248 coating agent Substances 0.000 title abstract description 25
- 238000000034 method Methods 0.000 title abstract description 20
- 229910052751 metal Inorganic materials 0.000 abstract description 19
- 239000002184 metal Substances 0.000 abstract description 19
- 150000001875 compounds Chemical class 0.000 abstract description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract description 8
- 239000002253 acid Substances 0.000 abstract description 8
- 230000001464 adherent effect Effects 0.000 abstract description 7
- 239000011701 zinc Substances 0.000 abstract description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 6
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 abstract description 6
- 239000011698 potassium fluoride Substances 0.000 abstract description 6
- 229910052725 zinc Inorganic materials 0.000 abstract description 6
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 abstract description 6
- 238000007654 immersion Methods 0.000 abstract description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 4
- 238000004140 cleaning Methods 0.000 abstract description 4
- 238000001035 drying Methods 0.000 abstract description 3
- 235000003270 potassium fluoride Nutrition 0.000 abstract description 3
- 235000005074 zinc chloride Nutrition 0.000 abstract description 3
- 239000011592 zinc chloride Substances 0.000 abstract description 3
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910001297 Zn alloy Inorganic materials 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000005269 aluminizing Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 101100406879 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) par-2 gene Proteins 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002844 continuous effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/12—Aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/30—Fluxes or coverings on molten baths
Definitions
- This invention is directed to the concept of coating ferrous metal articles, by the hot metal immersion method, to enhance the articles appearance and resistance to corrosion attack. To effect such results, an adherent and continuous layer of a corrosion resistant material on the ferrous article is essential.
- the prior art using various combinations of salts and acid has met with limited success in galvanizing and aluminizing processes due to production costs, processing controls and product performance.
- the ferrous article to be coated had to be cleaned of' grease and scale (oxides of iron) prior to the application of the metallic coating.
- the material preferably is cleaned and then bathed in an oxide reducing atmosphere, and without exposing it to the atmosphere is immediately immersed in a molten metal bath containing the coating metal.
- oxide reducing atmosphere oxide reducing atmosphere
- molten metal bath containing the coating metal For batch operations, particularly for large structural members, atmospheric exclusion is virtually impossible. Accordingly, alternatives for protecting the cleaned surfaces were found.
- the procedure was to apply athin flux coating following the cleaning, and then immersing the flux coated ferrous article into the molten metal bath.
- the nature of the fluxing composition is important to its effect on the ferrous base, for its ability to provide a proper surface for the reception of a metal coating, which is both continuous and adherent. Thus there is a relationship between the flux and coating metal.
- This invention relates to the process of coating ferrous articles by the molten metal immersion method, more particularly to the provision of a suitable aqueous flux containing fluosilicic acid for applying to the surfaces of the ferrous article prior to the metal coating thereon.
- said process includes cleaning the ferrous surfaces to remove grease, etc., pickling to remove scale, dipping directly into a flux bath containing from about 2 to about 15% by weight, H SiF with up to about a total of 25%, by weight of the flux bath, of the compounds from the group consisting of HCl, HF, KF, and Zn C1 where the quantity of said compounds depends on the alloy content of the ferrous article, drying the flux in situ, and immersing the flux coated ferrous article in a molten metal bath of at least 25% by weight aluminum, balance essentially zinc.
- the metallic coating solidifies to produce a ferrous article having a continuous, adherent coating of an aluminumzinc alloy.
- FIG. 1 is a flow sheet illustrating the preferred sequence of steps followed in carrying out the process of this invention.
- the present invention provides an improved hot metal immersion coating procedure yielding a ferrous article having a continuous, adherent coating of an aluminum-zinc alloy thereon.
- the coating method generally comprising wetting the cleaned scale free ferrous article with an aqueous solution containing from about 2 to 15 by weight, H SiF with up to a total of about 25 by weight, of the compounds selected from the group consisting of HCl, HF, KF, and ZnCl Following the wetting thereof, the ferrous article is dried such as by heating to a low temperature of up to about 400 F. to remove all signs of dampness. This is important, especially from a safety standpoint, to avoid splashing of the subsequently applied molten coating metal.
- the dry flux coated ferrous article is then immersed for from 2 to about 5 minutes, depending on the depth of metallic coating desired, in a molten metal bath containing at least 25 by weight, aluminum, preferably up to about balance essentially zinc. After removal, excess coating metal is removed, such as bumping or agitating the coated ferrous article, where it may be cooled by air or water quenching. The resulting product exhibits a continuou's, adherent alloy coating on the processed ferrous article.
- the term article is intended to include strip and wire (treated in a continuous manner), and shapes, such as structural members treated in a batch process.
- shapes such as structural members treated in a batch process.
- the greatest benefits from this invention are realized in the batch treatment of ferrous shapes, such as large structural steel members used in the construction industry.
- the further description and exemplary showings shall be directed to batch operations.
- a preferred fiuxing composition is as follows: removing said article from the aqueous acidic figx, drying q said article by heating to a low temperature, an immersg g Percent by g 5 ing the article in a molten bath containing said aluminumi 6 zinc coating alloy.
- KF The method claimed in claim 1 wherein the fluozncl d L8 silicicacrd is present in amount between about 2 to V Balance 10 by weight, of said aqueous flux.
- aqueous fluosilicic acid may be used alone 8.
- a flux for the treatment of a ferrous article prior to or in combination with only one or two of the remaining its immersion in a molten bath containing an aluminumcomponents Some combinations which have been found zinc alloy, comprising an aqueous acidic solution consuitable for mild carbon steel sheet and strip are listed sisting essentially of from 2 to 15%, by weight, of fluobelow. silicic acid, and a total of from 5 to 20%, by weight, of
- a method of forming a continuous alloy coating consisting of from 25% to about by weight alumi- RALPH KENDALL, Pflmafy Exflmlller num, balance essentially zinc, on a ferrous article, com- W. BALL, Assistant Examiner prising the steps of cleaning said ferrous article to re- U S C1 XR move grease and oxides from the surfaces thereof to be 70 coated, immersing said article in an aqueous acidic flux 117 -50, 114 C, 114 A; 14823
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
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 ARTICLES, WETTING THE SURFACES WITH AN AQUEOUS FLUX OF FLUOSILICIC ACID, WITH UP TO FOUR COMPOUNDS FROM THE GROUP CONSISTING OF HYDROCHLORIC ACID, HYDROFLUORIC ACID, POTASSIUM FLUORIDE AND 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 AND ADHERENT LAYER OF SAID ALUMINUM ALLOY.
Description
United States Patent O 3,806,356 FLUX AND METHOD OF COATING FERROUS ARTICLE Carlyle E. Shoemaker, Bethlehem, Pa., assignor to Bethlehem, Steel Corporation, Bethlehem, Pa. Filed Aug. 9, 1972, Ser. No. 275,610 Int. Cl. C23c 1/08; C23f 17/00 US. Cl. 117-50 11 Claims ABSTRACT OF THE DISCLOSURE 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 and adherent layer of said aluminum alloy.
BACKGROUND OF THE INVENTION This invention is directed to the concept of coating ferrous metal articles, by the hot metal immersion method, to enhance the articles appearance and resistance to corrosion attack. To effect such results, an adherent and continuous layer of a corrosion resistant material on the ferrous article is essential. The prior art using various combinations of salts and acid has met with limited success in galvanizing and aluminizing processes due to production costs, processing controls and product performance.
Typically, the ferrous article to be coated had to be cleaned of' grease and scale (oxides of iron) prior to the application of the metallic coating. In a continuous strand operation, i.e. strip or wire, the material preferably is cleaned and then bathed in an oxide reducing atmosphere, and without exposing it to the atmosphere is immediately immersed in a molten metal bath containing the coating metal. For batch operations, particularly for large structural members, atmospheric exclusion is virtually impossible. Accordingly, alternatives for protecting the cleaned surfaces were found. Generally, the procedure was to apply athin flux coating following the cleaning, and then immersing the flux coated ferrous article into the molten metal bath. Naturally, the nature of the fluxing composition is important to its effect on the ferrous base, for its ability to provide a proper surface for the reception of a metal coating, which is both continuous and adherent. Thus there is a relationship between the flux and coating metal.
While the prior art has made some significant contributions in the area of galvanizing and aluminizing, such efforts have not been totally satisfactory forpreparing ferrous surfaces for the reception of an aluminum-zinc coating. However, with the discovery of a fluosilicic acid containing flux, an effective means was found to prepare the surface of a ferrous article for subsequent coating by an aluminum-zinc alloy.
3,806,356 Patented Apr. 23, 1974 "ice SUMMARY OF THE INVENTION This invention relates to the process of coating ferrous articles by the molten metal immersion method, more particularly to the provision of a suitable aqueous flux containing fluosilicic acid for applying to the surfaces of the ferrous article prior to the metal coating thereon. In its preferred embodiment, said process includes cleaning the ferrous surfaces to remove grease, etc., pickling to remove scale, dipping directly into a flux bath containing from about 2 to about 15% by weight, H SiF with up to about a total of 25%, by weight of the flux bath, of the compounds from the group consisting of HCl, HF, KF, and Zn C1 where the quantity of said compounds depends on the alloy content of the ferrous article, drying the flux in situ, and immersing the flux coated ferrous article in a molten metal bath of at least 25% by weight aluminum, balance essentially zinc. Upon withdrawal from the molten bath, and removal of excess metal, such as by bumping, the metallic coating solidifies to produce a ferrous article having a continuous, adherent coating of an aluminumzinc alloy.
BRIEF DESCRIPTION OF THE DRAWING The figure is a flow sheet illustrating the preferred sequence of steps followed in carrying out the process of this invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Turning now to a more detailed review of the invention, as set forth in the illustrated flow sheet of the figure, it will be seen that the present invention provides an improved hot metal immersion coating procedure yielding a ferrous article having a continuous, adherent coating of an aluminum-zinc alloy thereon.
The coating method generally comprising wetting the cleaned scale free ferrous article with an aqueous solution containing from about 2 to 15 by weight, H SiF with up to a total of about 25 by weight, of the compounds selected from the group consisting of HCl, HF, KF, and ZnCl Following the wetting thereof, the ferrous article is dried such as by heating to a low temperature of up to about 400 F. to remove all signs of dampness. This is important, especially from a safety standpoint, to avoid splashing of the subsequently applied molten coating metal.
The dry flux coated ferrous article is then immersed for from 2 to about 5 minutes, depending on the depth of metallic coating desired, in a molten metal bath containing at least 25 by weight, aluminum, preferably up to about balance essentially zinc. After removal, excess coating metal is removed, such as bumping or agitating the coated ferrous article, where it may be cooled by air or water quenching. The resulting product exhibits a continuou's, adherent alloy coating on the processed ferrous article.
At this juncture, it should be made clear that as used herein, the term article is intended to include strip and wire (treated in a continuous manner), and shapes, such as structural members treated in a batch process. Actually, the greatest benefits from this invention are realized in the batch treatment of ferrous shapes, such as large structural steel members used in the construction industry. Though not limiting, the further description and exemplary showings shall be directed to batch operations.
Optimum results, particularly in the treatment of alloy structural steels, were observed with fluxing compositions containing from about 4.0 to 8.0%, by weight, H SiF 3 .7 r :4 and about 5.0 to 20.0%, by weight, of a plurality of the consisting essentially of fluosilicic acid, and up to four remaining compounds listed above. For example, from compounds from the group consisting of hydrochloric acid the standpoint of coating coverage, adherence and appearhydrofluoric acid, potassium fluoride and zinc chloride, ance, a preferred fiuxing composition is as follows: removing said article from the aqueous acidic figx, drying q said article by heating to a low temperature, an immersg g Percent by g 5 ing the article in a molten bath containing said aluminumi 6 zinc coating alloy. KF The method claimed in claim 1 wherein the fluozncl d L8 silicicacrd is present in amount between about 2 to V Balance 10 by weight, of said aqueous flux.
- n V 3. The method claimed in claim 2 wherein at least one To further illustrate the effectiveness of the fluxing comof said four compounds is present up to a total amount of position on surface coverage, evaluations were made on by weight, of said aqueous flux. two common grades of structural steel, with variations in 4. The method claimed in claim 2 wherein said fluofiux composition. The said variations are listed in Table I, 15 silicic acid is present in an amount between about 4 to 8%. with the results in Table II. 5. The method claimed in claim 4 wherein at least one TABLE I Flux baths, weight percent A B C D E F G H J K L M N P Q Components:
TABLE II Percent surface covered, 5 minutes dip A B C D E F G H .T K L M N P Q While it may be gleaned from the foregoing tabulaof said four compounds is present in an amount between tion, as it pertains to alloyed steels, optimum results or about 5 to 20%, by weight, of said aqueous flux. surface coverage were noted with the richer fluxes, i.e. 6. The method claimed in claim 5 wherein a plurality those containing a plurality of said compounds. However, of said four compounds are present in said aqueous flux. with leaner ferrous articles, such as mild or low carbon 7. The method claimed in claim 5 wherein at least steels, simpler flux combinations, with the components 40 three of said four compounds are present in said aqueous named, may be formulated. flux.
For instance, aqueous fluosilicic acid may be used alone 8. A flux for the treatment of a ferrous article prior to or in combination with only one or two of the remaining its immersion in a molten bath containing an aluminumcomponents. Some combinations which have been found zinc alloy, comprising an aqueous acidic solution consuitable for mild carbon steel sheet and strip are listed sisting essentially of from 2 to 15%, by weight, of fluobelow. silicic acid, and a total of from 5 to 20%, by weight, of
' at least one compound selected from the group consisting TABLE In of hydrochloric acid, hydrofluoric acid, potassium fluoride, and zinc chloride. f if g gg 9. The flux claimed in claim 8 wherein said fluosilicic N P Q acid is present in an amount between about 4 to 8%.
10. The flux claimed in claim 9.wherein a plurality of said four compounds are present in the aqueous fluxQ i jjj"jjj 11. The flux claimed in claim 10 wherein at least three g 10 of said four compounds are present in the aqueous flux. I
References Cited Since the foregoing represents the preferred embodi- U ITE STATES PATENTS merits of this invention, it is contemplated that variations 2 571,737 3 1954 jominy et 1 1172.51 may be effected herein by those skilled in the art, par- 2 907 104 1 959 Brown et 1 9 ticularly after reading these specificatiions. accordingly, 2 174 551 10 1939 Cinamon et 1 117 5.2 no limitation is intended to be impose on t 's invention except as set forth in the appended claims. FOREIGN PATENTS 1 l i 1,025,603 4/1966 Great Britain 117-52 1. A method of forming a continuous alloy coating consisting of from 25% to about by weight alumi- RALPH KENDALL, Pflmafy Exflmlller num, balance essentially zinc, on a ferrous article, com- W. BALL, Assistant Examiner prising the steps of cleaning said ferrous article to re- U S C1 XR move grease and oxides from the surfaces thereof to be 70 coated, immersing said article in an aqueous acidic flux 117 -50, 114 C, 114 A; 14823
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00275610A US3806356A (en) | 1972-08-09 | 1972-08-09 | Flux and method of coating ferrous article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00275610A US3806356A (en) | 1972-08-09 | 1972-08-09 | Flux and method of coating ferrous article |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3806356A true US3806356A (en) | 1974-04-23 |
Family
ID=23053090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00275610A Expired - Lifetime US3806356A (en) | 1972-08-09 | 1972-08-09 | Flux and method of coating ferrous article |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3806356A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4148942A (en) * | 1975-01-18 | 1979-04-10 | Politechmika Slaska Im. Wincentego Pstrowskiego | Removal of excess molten aluminum or its alloys from articles coated by the hot-dip method |
| US4158710A (en) * | 1976-12-31 | 1979-06-19 | Politechnika Slaska Im. Wincentego Pstrowskiego | Method of preparation of the surfaces of products made of iron alloys, preceding the process of hot-dip aluminizing |
| US4496612A (en) * | 1982-04-06 | 1985-01-29 | E. I. Du Pont De Nemours And Company | Aqueous flux for hot dip metalizing process |
| US20060177687A1 (en) * | 2003-03-20 | 2006-08-10 | Bluescope Steel Limited | Method of controlling surface defects in metal-coated strip |
| US20070137731A1 (en) * | 2005-12-20 | 2007-06-21 | David Leychkis | Flux and process for hot dip galvanization |
-
1972
- 1972-08-09 US US00275610A patent/US3806356A/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4148942A (en) * | 1975-01-18 | 1979-04-10 | Politechmika Slaska Im. Wincentego Pstrowskiego | Removal of excess molten aluminum or its alloys from articles coated by the hot-dip method |
| US4158710A (en) * | 1976-12-31 | 1979-06-19 | Politechnika Slaska Im. Wincentego Pstrowskiego | Method of preparation of the surfaces of products made of iron alloys, preceding the process of hot-dip aluminizing |
| US4496612A (en) * | 1982-04-06 | 1985-01-29 | E. I. Du Pont De Nemours And Company | Aqueous flux for hot dip metalizing process |
| US20060177687A1 (en) * | 2003-03-20 | 2006-08-10 | Bluescope Steel Limited | Method of controlling surface defects in metal-coated strip |
| US8840968B2 (en) | 2003-03-20 | 2014-09-23 | Bluescope Steel Limited | Method of controlling surface defects in metal-coated strip |
| US20070137731A1 (en) * | 2005-12-20 | 2007-06-21 | David Leychkis | Flux and process for hot dip galvanization |
| US7811389B2 (en) | 2005-12-20 | 2010-10-12 | Teck Metals Ltd. | Flux and process for hot dip galvanization |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1352100B1 (en) | Flux and process for hot dip galvanization | |
| US2569097A (en) | Method of coating ferrous metal with aluminum or an aluminum alloy | |
| AU2002219142A1 (en) | Flux and process for hot dip galvanization | |
| US3860438A (en) | Flux and method of coating ferrous article | |
| US2686355A (en) | Process for coating metals with aluminum | |
| US2101553A (en) | Coating iron or steel with aluminum or an alloy thereof | |
| US3943270A (en) | Aqueous flux for hot dip galvanising process | |
| US3806356A (en) | Flux and method of coating ferrous article | |
| AU628273B2 (en) | Preparing metal for melt-coating | |
| US4496612A (en) | Aqueous flux for hot dip metalizing process | |
| US3085028A (en) | Method and means for depositing silicon | |
| US3936540A (en) | Hot dip galvanising | |
| US3712826A (en) | Method of improving the surface of galvanized steel material | |
| CA2056666C (en) | Flux for use in a dry process for flux treatment for molten metal coating, and a process for manufacturing steel coated with molten metal including treatment with the same flux | |
| US2731362A (en) | Aluminum coating of ferrous metal articles | |
| US3617345A (en) | Method of manufacturing aluminum coated ferrous base articles | |
| US5292377A (en) | Flux suitable for coating molten zinc, molten alloy of aluminum and zinc, and molten aluminum | |
| US3740275A (en) | Galvanizing preflux wash composition | |
| US3632453A (en) | Method of manufacturing aluminum-coated ferrous base articles | |
| JPH06279968A (en) | Aluminum-zinc alloy plating method for iron and steel products | |
| US2916397A (en) | Aluminum coating process | |
| US4142011A (en) | Method of producing coatings of copper alloy on ferrous alloys | |
| JPH0394050A (en) | Flux for galvanizing zn-al alloy | |
| US1520732A (en) | Process of coating ferric articles with a metallic protective | |
| JP2000160315A (en) | Hot dip galvannealed steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: BIEC INTERNATIONAL, INC., A CORP. OF DE. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BETHLEHEM STEEL CORPORATION, A CORP. OF DE.;REEL/FRAME:004725/0130 Effective date: 19870505 |