US1941750A - Method of thermically coating objects of iron or steel with aluminum or aluminum alloy - Google Patents
Method of thermically coating objects of iron or steel with aluminum or aluminum alloy Download PDFInfo
- Publication number
- US1941750A US1941750A US508378A US50837831A US1941750A US 1941750 A US1941750 A US 1941750A US 508378 A US508378 A US 508378A US 50837831 A US50837831 A US 50837831A US 1941750 A US1941750 A US 1941750A
- Authority
- US
- United States
- Prior art keywords
- aluminum
- iron
- objects
- bath
- thermically
- 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
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
- C23C2/30—Fluxes or coverings on molten baths
Definitions
- This invention relates to a method of thermically coating objects of iron or steel with aluminum or aluminum alloy by immersing the objects into a bath of molten aluminum or aluminum 5 alloy, flux being used which facilitates the formation of the coating.
- flux being used which facilitates the formation of the coating.
- the objects are immersed, according to the invention, into a melted flux bath 16 containing CaClz, ZnCla, an alkali chlorid and an alkali aluminum fluorid before they are transmitted to the metal bath after having first been mechanically cleaned to remove fatty substances, oxides and slag, or having been subjected to 20 mordanting in diluted acid and, if necessary, having also been subjected to another treatment for volatilizing superficial impurities.
- the proportions of the aibstances forming the melted flux bath may lie within the following limits:
- While the objects are immersed in the melted flux bath they may be kept in rotation or stirred in another manner or they may be subjected to the action of brushes or other mechanical means for facilitating the removing of the dust particles.
- the melted flux bath may have such a temperature that the objects contained therein will be heated so much that they can be transmittedto the molten bath of aluminum or aluminum alloy without'their temperature sinking beneath the melting-point of the said bath.
- the treatment for volatilizing impurities which may precede the immersing into the melted flux bath consists preferably in that the objects are dipped into a melt of NH4Cl/ZnCh or they are immersed into an aqueous solution of the said double salt, and then they are dried by heating. By the heating the chloride is transformed. with oxidic impurities on the surfaces of the objects, into impurities which volatilize, and the objects will be coated by .an anhydrous layer of salt which preserves against oxidation. Iron and coal particles which are dissociated on the surfaces of the objects by this treatment are removed by the subsequent immersing into the melted flux bath.
- NHlOl/ZtiCl another salt may be used which forms volatile compounds with the said oxides and produces the coating of the objects with a coherent layer 00 of salt preserving against oxidation.
- the heating of the flux bath being carried to such a degree that the transferring of the object from the flux bath to the metal bath can be carried out without having the temperature of the object fall below the melting point of the metal bath.
- a flux for use in plating ferrous with aluminum or aluminum alloy which consists of the following substances:
Description
Patented Jan. 2, 1934 UNITED STATES METHOD OF THERMICALLY C O A T I N OBJECTS OF IRON OR STEEL WITH ALU- MINUM OR ALUMINUM ALLOY Erik Harry Eugen Johansson, Stockholm, Sweden No Drawing.
Application January 12, 1931, 1
Serial No. 508,378, and in Sweden February 17,
5 Claims. (01'. 91-702) This invention relates to a method of thermically coating objects of iron or steel with aluminum or aluminum alloy by immersing the objects into a bath of molten aluminum or aluminum 5 alloy, flux being used which facilitates the formation of the coating. In order to obtain by this method a uniform coating adhering at all points and forming a real alloy with the underlying metal it is of great importance that the surfaces of the objects are free from all impurities and are not covered by any dissociated iron or coal particles.
For this purpose the objects are immersed, according to the invention, into a melted flux bath 16 containing CaClz, ZnCla, an alkali chlorid and an alkali aluminum fluorid before they are transmitted to the metal bath after having first been mechanically cleaned to remove fatty substances, oxides and slag, or having been subjected to 20 mordanting in diluted acid and, if necessary, having also been subjected to another treatment for volatilizing superficial impurities. The proportions of the aibstances forming the melted flux bath may lie within the following limits:
2-50 parts by weight of anhydrous CaCh 1-80 parts by weight of anhydrous KCl 55-20 by weight of anhydrous NaCl 5-6 by weight of anhydrous NaaAlFs 5-30 parts by weight of anhydrous ZnClr.
While the objects are immersed in the melted flux bath they may be kept in rotation or stirred in another manner or they may be subjected to the action of brushes or other mechanical means for facilitating the removing of the dust particles.
The melted flux bath may have such a temperature that the objects contained therein will be heated so much that they can be transmittedto the molten bath of aluminum or aluminum alloy without'their temperature sinking beneath the melting-point of the said bath.
The treatment for volatilizing impurities which may precede the immersing into the melted flux bath consists preferably in that the objects are dipped into a melt of NH4Cl/ZnCh or they are immersed into an aqueous solution of the said double salt, and then they are dried by heating. By the heating the chloride is transformed. with oxidic impurities on the surfaces of the objects, into impurities which volatilize, and the objects will be coated by .an anhydrous layer of salt which preserves against oxidation. Iron and coal particles which are dissociated on the surfaces of the objects by this treatment are removed by the subsequent immersing into the melted flux bath. Instead of NHlOl/ZtiCl: another salt may be used which forms volatile compounds with the said oxides and produces the coating of the objects with a coherent layer 00 of salt preserving against oxidation.
Having now described my invention, what I claim as new and desire to secure by Letters Patent is:
1. The method of plating ferrous objects with 66 aluminum or alloy containing aluminum as the principal constituent, which comprmes cleaning the object to remove fatty substances, oxides and slag, immersing the object in a molten flux bath which contains calcium chloride, an alkali chlo- 70 ride, zinc chloride and an alkali aluminum fluoride, heating the flux bath, and transferring the object to the metal bath the temperature of which is about the melting point of the metal,
the heating of the flux bath being carried to such a degree that the transferring of the object from the flux bath to the metal bath can be carried out without having the temperature of the object fall below the melting point of the metal bath.
2. The method set forth in claim 1, which includes the step of stirring the object while it is immersed in theflux bath.
3. The method set forth in claim 1, wherein the object, before being immersed in the flux 86 bath, is immersed in a solution of a salt which forms volatile compounds with the oxygen impurities occurring on the surface of the object and which produces by heating a coherent layer of salt on the surface'of the object.
4. The method set forth in claim 1', wherein the flux bath contains the following substances:
2-50 parts by weight of anhydrous CaCl:
1-30 parts by weight of anhydrous KC! Vz-20 parts by weight of anhydrous NaCl 5-5 parts by weight of anhydrous NuAll'u %30 parts by weight of anhydrous ZnClr.
5. A flux for use in plating ferrous with aluminum or aluminum alloy, which consists of the following substances:
ERIK HARRY EUGEN JOHANSSON.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1941750X | 1930-02-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
US1941750A true US1941750A (en) | 1934-01-02 |
Family
ID=20424083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US508378A Expired - Lifetime US1941750A (en) | 1930-02-17 | 1931-01-12 | Method of thermically coating objects of iron or steel with aluminum or aluminum alloy |
Country Status (1)
Country | Link |
---|---|
US (1) | US1941750A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2473004A (en) * | 1945-06-02 | 1949-06-14 | Du Pont | Galvanizing flux |
US2544671A (en) * | 1948-02-12 | 1951-03-13 | Gen Motors Corp | Method of forming composite products consisting of ferrous metal and aluminum or aluminum-base alloy |
US2569097A (en) * | 1951-02-20 | 1951-09-25 | Gen Motors Corp | Method of coating ferrous metal with aluminum or an aluminum alloy |
US2671737A (en) * | 1950-10-10 | 1954-03-09 | Chrysler Corp | Aluminum coating process and flux |
US2723449A (en) * | 1954-04-23 | 1955-11-15 | Aluminum Co Of America | Method of dip brazing aluminous metal members |
US2847321A (en) * | 1945-03-16 | 1958-08-12 | Lowell D Eubank | Metal surface treatment |
US2872348A (en) * | 1946-05-06 | 1959-02-03 | Lowell D Eubank | Fused salt method for coating uranium with a metal |
US3244551A (en) * | 1965-02-24 | 1966-04-05 | Chemical Products Corp | Method of galvanizing a ferrous metal and a galvanizing flux composition therefor |
-
1931
- 1931-01-12 US US508378A patent/US1941750A/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2847321A (en) * | 1945-03-16 | 1958-08-12 | Lowell D Eubank | Metal surface treatment |
US2473004A (en) * | 1945-06-02 | 1949-06-14 | Du Pont | Galvanizing flux |
US2872348A (en) * | 1946-05-06 | 1959-02-03 | Lowell D Eubank | Fused salt method for coating uranium with a metal |
US2544671A (en) * | 1948-02-12 | 1951-03-13 | Gen Motors Corp | Method of forming composite products consisting of ferrous metal and aluminum or aluminum-base alloy |
US2671737A (en) * | 1950-10-10 | 1954-03-09 | Chrysler Corp | Aluminum coating process and flux |
US2569097A (en) * | 1951-02-20 | 1951-09-25 | Gen Motors Corp | Method of coating ferrous metal with aluminum or an aluminum alloy |
US2723449A (en) * | 1954-04-23 | 1955-11-15 | Aluminum Co Of America | Method of dip brazing aluminous metal members |
US3244551A (en) * | 1965-02-24 | 1966-04-05 | Chemical Products Corp | Method of galvanizing a ferrous metal and a galvanizing flux composition therefor |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2569097A (en) | Method of coating ferrous metal with aluminum or an aluminum alloy | |
US2395694A (en) | Processes for removing oxide from the surface of metals | |
US2544671A (en) | Method of forming composite products consisting of ferrous metal and aluminum or aluminum-base alloy | |
US1941750A (en) | Method of thermically coating objects of iron or steel with aluminum or aluminum alloy | |
US2458661A (en) | Process of cleaning metal surfaces and compositions therefor | |
US2101553A (en) | Coating iron or steel with aluminum or an alloy thereof | |
US2686354A (en) | Process for coating and uniting metal shapes with aluminum | |
US1914269A (en) | Method of applying metal coatings | |
US3037880A (en) | Coating of titanium and titanium alloys with aluminum and aluminum alloys | |
US2304069A (en) | Metal coating process | |
US2881491A (en) | Method of casting aluminum on ferrous base to form duplex structure | |
US3547787A (en) | Hot dip tinning a high carbon ferrous metal | |
US2912346A (en) | Method of coating ferrous articles with magnesium and magnesium-base alloys | |
JPH0670269B2 (en) | Aluminum / zinc alloy hot-dip flux | |
US3806356A (en) | Flux and method of coating ferrous article | |
US1276977A (en) | Method of coating metal articles. | |
US1501293A (en) | Method of coating metals, flux therefor, etc. | |
US2493768A (en) | Method of lead coating | |
US1799945A (en) | Process for heat treatment of metal articles | |
US2408623A (en) | Coating ferrous metals with molten aluminum | |
US2963384A (en) | Method of aluminizing ferrous materials | |
AT132683B (en) | Process for coating objects made of iron or steel with aluminum or an aluminum alloy in a molten metal bath. | |
US3740275A (en) | Galvanizing preflux wash composition | |
US3708406A (en) | Tinning high carbon ferrous metals coated with iron using alkaline plating baths with chelating agents | |
US3677953A (en) | Permanganate silicate cleaner |