US2437919A - Process and means for improving the adherence of aluminum coatings - Google Patents

Process and means for improving the adherence of aluminum coatings Download PDF

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Publication number
US2437919A
US2437919A US605990A US60599045A US2437919A US 2437919 A US2437919 A US 2437919A US 605990 A US605990 A US 605990A US 60599045 A US60599045 A US 60599045A US 2437919 A US2437919 A US 2437919A
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US
United States
Prior art keywords
bath
metal
hood
bell
atmosphere
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
Application number
US605990A
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English (en)
Inventor
Oganowski Kasimir
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
American Rolling Mill Co
Original Assignee
American Rolling Mill Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by American Rolling Mill Co filed Critical American Rolling Mill Co
Priority to US605990A priority Critical patent/US2437919A/en
Priority to FR957215D priority patent/FR957215A/fr
Priority to BE478199A priority patent/BE478199A/fr
Application granted granted Critical
Publication of US2437919A publication Critical patent/US2437919A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • C23C2/04—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9335—Product by special process
    • Y10S428/939—Molten or fused coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12951—Fe-base component

Definitions

  • My invention relates to problems encountered in coating metallic strips, sheets or articles with molten aluminum or similar metals in the type of process in which the products to be coated pass through a hood of protective atmosphere into the bath of coating metal.
  • My invention is based upon the discovery that it is possible to form a coating upon the surface of the bath-which is powdery in nature but nonadherent to the strip. This coating appears to prevent to a very large degree at least, interaction of the bath and atmospheric constituents; and in any event neutralizes the effect of and renders non-adhesive to the strip such nitrides, oxides and the like as may otherwise be formed.
  • the sodium vapors be formed or introduced in the hood between the surface of the bath and the point of introduction of the protective atmosphere (which is usually located in the lower part of the hood quite near the bell) since otherwise the sodium vapors may be unduly diluted by the protective atmosphere or swept away by it from the surface of the bath. If the sodium vapors are generated elsewhere and introduced into the hood or bell, precautions should be taken to avoid mixing the vapors with the hood atmosphere, and to avoid unnecessary turbulence within the hood.
  • the open top of the container or containers is located very close to the surface of the bath exposed within the hood or hell and the generation of sodium vapors at this point serves the purpose of my invention, as above explained.
  • the open top of the container will be located below the inlet into the hood for the protective atmosphere.
  • I have indicated at I a pot for molten coating metal containing, say, molten aluminum 2.
  • the strip 9 coming from a reducing furnace in this instance passes through a hood 4 in which it is protected by a reducing atmosphere, e. g. cracked ammonia, enters the bath and passes around a sheave 3 so that it may emerge from the bath outside the hood.
  • the hood terminates in a bell 5, the lips of which extend below the surface of the molten aluminum.
  • An inlet for the protective atmosphere is indicated at 6 near the lower end of the hood.
  • I build my bell in such a way as to provide the aforesaid open top container surrounding the strip, by carrying inwardly the metal walls of the bell as at 1 and 8 and carrying upwardly within the bell a collar-like portion In.
  • These parts are welded or otherwise fastened together so that the bell walls and parts I, 8 and I0 form an upwardly open container surrounding the strip.
  • the molten aluminum rises within the collar portion l0 and its surface lies very close to the upper end of the collar portion.
  • Metallic sodium is introduced into the open top container where it melts and flows around. covering the bottom of the container. It is gradually vaporized and it will be noted that the vapors are generated very close to the surface of the molten aluminum, and that in the apparatus disclosed the heavy sodium vapors will flow down upon the surface of the aluminum bath.
  • the rfietallic sodium in the container is indicated at For the introduction of sodium into the container, as is required from time to time, I preferably provide a conduit l2 equipped with a pair of valves or gates l3 and Hi. The employment of two quick opening valves in series permits me to introduce the sodium without permitting the suction of air into the bell.
  • the sodium is preferably introduced in solid form in pieces or pellets of suitable size, although it may be liquefied before introduction, if desired.
  • the liquefaction of the sodium in the apparatus described renders unnecessary its preliquefaction, and the inconvenience of handling liquid sodium in pipes or cond-uits wherein it may freeze and produce stoppage is avoided.
  • the hood 4 and hell 5 are in communication with each other but are closed to the open air, the bath serving to close the lower end of the bell.
  • My invention is not limited to the coating of any particular metallic article, but is applicable to wire, sheets and even individual articles, it being understood that in the case of sheets or single articles suitable means are provided for conveying them through the hood and bell, into the bath and out again at the exit portion of the bath.
  • said hood and said bell serving to protect metal to be coated from the external atmosphere while it is carried into said bath, and an open top container for alkali metal located within said bell and formed in part of the bell walls, including inward and upward extensions thereof, said container extending about said bell on the inside and serving to maintain alkali metal in heat exchange relationship to the metal of said bath, the top of said container being open and located in close proximity to the surface of the bath within said bell, and means for introducing alkali metal into said container through the bell wall without opening up said bell to the surrounding atmosphere, said means comprising means in connection with said bell for accepting said alkali metal, and means operable sequentially to close said last mentioned means to the atmosphere in said bell and open it to the external atmosphere for receiving said metal, and to close it to the external atmosphere and open it to said bell for admitting said metal to said bell.
  • a container for a bath of molten coating metal a hood through which metal to be coated may be passed into said bath, said hood having a portion extending into the bath of molten metal whereby the end of said hood is sealed, inlet means for introducing a protective atmosphere into said hood at a point spaced from the surface of said bath, whereby said atmosphere moves into said hood in counter-current to the metal to be coated, and is substantially quiescent at the surface of said bath, a container having walls in heat exchange relation with said bath of molten metal, said container having an open top located wholly within said hood portion, and near but above the surface of said molten metal, and means for introducing alkali metal into said container without opening up said hood to the external atmosphere, said means comprising means in connection with said ball for accepting said alkali metal, and means operable sequentially to close said last mentioned means to the atmosphere in said bell and open it to the external atmosphere for receiving said metal, and to close it to the external atmosphere and open it

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)
US605990A 1945-07-19 1945-07-19 Process and means for improving the adherence of aluminum coatings Expired - Lifetime US2437919A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US605990A US2437919A (en) 1945-07-19 1945-07-19 Process and means for improving the adherence of aluminum coatings
FR957215D FR957215A (enrdf_load_html_response) 1945-07-19 1947-12-12
BE478199A BE478199A (enrdf_load_html_response) 1945-07-19 1947-12-16

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US605990A US2437919A (en) 1945-07-19 1945-07-19 Process and means for improving the adherence of aluminum coatings

Publications (1)

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US2437919A true US2437919A (en) 1948-03-16

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US605990A Expired - Lifetime US2437919A (en) 1945-07-19 1945-07-19 Process and means for improving the adherence of aluminum coatings

Country Status (3)

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US (1) US2437919A (enrdf_load_html_response)
BE (1) BE478199A (enrdf_load_html_response)
FR (1) FR957215A (enrdf_load_html_response)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2774686A (en) * 1952-01-08 1956-12-18 Kaiser Aluminium Chem Corp Hot dip aluminum coating process
US2775938A (en) * 1951-09-27 1957-01-01 Nat Distillers Prod Corp Flash bomb
US2788289A (en) * 1951-06-29 1957-04-09 Climax Molybdenum Co Method of forming protective coatings for molybdenum and molybdenum-base alloys
US3018190A (en) * 1960-09-26 1962-01-23 Armco Steel Corp Method and apparatus for treating metallic strands in hot dip coating
US3051587A (en) * 1960-08-19 1962-08-28 Armco Steel Corp Method of treating metallic strip with sodium vapor
DE1248417B (de) * 1956-05-09 1967-08-24 Armco Steel Corp Verfahren und Vorrichtung zum Aufbringen eines metallischen UEberzugs auf metallisches Bandmaterial in einem Metallschmelzbad
DE1262727B (de) * 1962-07-20 1968-03-07 Armco Steel Corp Verfahren zum UEberziehen eines Eisenmetallgegenstandes, insbesondere eines Eisenbandes, mit Aluminium oder einer Aluminiumlegierung durch Eintauchen in das geschmolzene UEberzugsmetall
US3457097A (en) * 1964-02-10 1969-07-22 Yawata Seitetsu Kk Method of coating ferrous metal with molten aluminum

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE393403B (sv) * 1972-08-09 1977-05-09 Bethlehem Steel Corp Sett att overdraga ytan av en jernstreng med en al-zn-legering

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1378052A (en) * 1920-11-09 1921-05-17 Wheeling Steel & Iron Company Process of coating steel sheets with aluminum
US2046036A (en) * 1933-02-24 1936-06-30 Rodriguez Anselmo Ortiz Method of coating ferrous bodies with other metals
US2166251A (en) * 1936-04-02 1939-07-18 Joseph L Herman Apparatus for coating metallic materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1378052A (en) * 1920-11-09 1921-05-17 Wheeling Steel & Iron Company Process of coating steel sheets with aluminum
US2046036A (en) * 1933-02-24 1936-06-30 Rodriguez Anselmo Ortiz Method of coating ferrous bodies with other metals
US2166251A (en) * 1936-04-02 1939-07-18 Joseph L Herman Apparatus for coating metallic materials

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2788289A (en) * 1951-06-29 1957-04-09 Climax Molybdenum Co Method of forming protective coatings for molybdenum and molybdenum-base alloys
US2775938A (en) * 1951-09-27 1957-01-01 Nat Distillers Prod Corp Flash bomb
US2774686A (en) * 1952-01-08 1956-12-18 Kaiser Aluminium Chem Corp Hot dip aluminum coating process
DE1248417B (de) * 1956-05-09 1967-08-24 Armco Steel Corp Verfahren und Vorrichtung zum Aufbringen eines metallischen UEberzugs auf metallisches Bandmaterial in einem Metallschmelzbad
US3051587A (en) * 1960-08-19 1962-08-28 Armco Steel Corp Method of treating metallic strip with sodium vapor
US3018190A (en) * 1960-09-26 1962-01-23 Armco Steel Corp Method and apparatus for treating metallic strands in hot dip coating
DE1262727B (de) * 1962-07-20 1968-03-07 Armco Steel Corp Verfahren zum UEberziehen eines Eisenmetallgegenstandes, insbesondere eines Eisenbandes, mit Aluminium oder einer Aluminiumlegierung durch Eintauchen in das geschmolzene UEberzugsmetall
US3457097A (en) * 1964-02-10 1969-07-22 Yawata Seitetsu Kk Method of coating ferrous metal with molten aluminum

Also Published As

Publication number Publication date
FR957215A (enrdf_load_html_response) 1950-02-15
BE478199A (enrdf_load_html_response) 1948-01-31

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