US3018190A - Method and apparatus for treating metallic strands in hot dip coating - Google Patents

Method and apparatus for treating metallic strands in hot dip coating Download PDF

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Publication number
US3018190A
US3018190A US58270A US5827060A US3018190A US 3018190 A US3018190 A US 3018190A US 58270 A US58270 A US 58270A US 5827060 A US5827060 A US 5827060A US 3018190 A US3018190 A US 3018190A
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US
United States
Prior art keywords
strand
coating
sodium
aluminum
pretreatment
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
US58270A
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English (en)
Inventor
Earle L Knapp
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.)
Armco Inc
Original Assignee
Armco Inc
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 Armco Inc filed Critical Armco Inc
Priority to US58270A priority Critical patent/US3018190A/en
Priority to BE608128A priority patent/BE608128A/fr
Priority to GB34512/61A priority patent/GB918372A/en
Application granted granted Critical
Publication of US3018190A publication Critical patent/US3018190A/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
    • C23C2/003—Apparatus
    • C23C2/0036—Crucibles
    • C23C2/00361—Crucibles characterised by structures including means for immersing or extracting the substrate through confining wall area
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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

Definitions

  • This invention relates to a process and an apparatus for treating metallic strands prior to hot dip coating and particularly where the coating metal is aluminum or an aluminum alloy.
  • the strand prior to entering the aluminum bath according to the Oganowski patent, was given a pretreatment as described and claimed in the Sendzimir Patents Nos. 2,110,893 and 2,136,957, wherein the strand is first chemically cleaned and then dried and then passed through a high temperature reduction furnace and then a controlled cooling furnace before entering the molten coating metal.
  • FIGURE 1 is a fragmentary cross-sectional view of a structure for supplying sodium vapor to the strand after the pretreatment portion of the apparatus and prior to its entry into the coating pot.
  • FIGURE 2 is an enlarged elevational view with parts broken away of a portion of the structure of FIGURE 1.
  • I provide a holder for metallic sodium in communication with a tubular portion of the apparatus connecting the pretreatment apparatus with the coating pot.
  • the holder is generally tubular and is disposed at an angle with its upper end communicating with the said tubular portion.
  • the connection between the tubular portion of the apparatus and the holder, and the holder itself, may be insulated such that the heat of the strand melts the metallic sodium and causes it to be vaporized.
  • Such reaction products as may be formed with the metallic sodium and 2v which may be principally sodium hydroxide, will. fall to the bottom of the holder so that the. molten sodium before vaporization etfectively floats on top of its. reaction products, whereby the molten elemental sodium is. closest to the hot strand from which it. can absorb heatfor vaporization.
  • the end of the pretreatment apparatus (this. may be the top of the turn-up box) is indicated at 19.
  • a tubular. member 20 connects the exit from the member 19 with the bottom of the coating pot (not shown).
  • the strand 15 passes vertically upward through the member 20.
  • a pipe through whichv a non-oxidizing or a reducing gas is fed, which gas flows oppositely to. the direction of movement of the strand and flows through a portion at least of the pretreatment apparatus.
  • the member 20 is provided with an opening 22 over which is secured, by welding or other suitable means, a tubular member 23.
  • the precise angle at which the member 23 isdisposed is not critical but it should be upwardly directed with respect to the. opening 22.
  • a collar or the like 24 Suitablysecured to the lower end of the member 23 is a collar or the like 24 provided with bolt holes 25 and having the annular shoulder 26.
  • the member 23 is closed at its. lower end by means of a member 27 which may be similar in configuration to the member 24 and is provided with the mating bolt holes 28.
  • the member 27 is either solid or plugged as. at 29 and has an annular groove '30 into which. the annular shoulder 26 is adapted to enter.
  • a suitable gasket 31 is seated between the shoulder 26 and the groove 30 to provide a gas-tight seal.
  • the member 27 is secured in place by means of bolts 32.
  • the member 23 and its associated parts thus constitute a holder within which is placed a cartridge indicated generally at 33 in FIGURE 1 and shown in detail in FIG- URE 2.
  • This cartridge is simply a piece of thin walled steel tubing plugged at its lower end as at 35 and open at its upper end and provided with a wire loop 34 for handling.
  • the metallic sodium is placed in the cartridge 33 and the cartridge is then slipped into place in the holder 23 and held in place by the member 27.
  • the molten sodium has been indicated diagrammatically at 36 and the molten reaction products at 37, and it will be seen that the molten elemental sodium floats on top of its reaction products Where it is subjected to the heat of the strand 15.
  • the use of the metal cartridge contributes greatly to safety in handling of the metallic sodium.
  • the metallic sodium is depleted, it is a simple matter to remove the cartridge 33 and replace it with a fresh cartridge charged with fresh metallic sodium.
  • the heat of the strand melts the metallic sodium and brings about its vaporization.
  • the rate of vaporization of the molten sodium is a function of the amount of radiant heat absorption and of the amount of insulation around the holder 23 and the tubular element 20. Such insulation is shown at 38.
  • the holder 23 and the adjacent portion of the member 20 must be well insulated.
  • the proper amount of insulation for the particular size strand being coated can readily be determined by one skilled in the art.
  • the basic function of the sodium vapor in this process is to modify the oxide film which may be on the surface of the bath of coating metal through which the strand ultimately passes, and that the sodium may cleanse the molten aluminum which contacts the sodium treated strand, of dissolved gases and entrapped microscopic oxide particles, as well as scavenging the atmosphere of minor percentages of oxygen which may have infiltrated this portion of the apparatus.
  • a structure according to claim 1, wherein said last named means comprises a tubular open top cartridge removably disposed in said branch fitting.
  • a structure according to claim 2, wherein said cartridge is of thin walled steel tubing and is provided with hand grip means.
  • the apparatus to the coating pot passes through a tubular member into which a non-oxidizing gas is fed; the steps of enhancing the wettability of said strand by said aluminum and thus improving the quality and appearance of the aluminum coated strand, which include causing said strand while hot and before it enters said coating pot, to melt and vaporize metallic sodium, causing said vaporized sodium to contact the strand in admixture with said non-oxidizing gas, and protecting said strand from the atmosphere up to its entry into the coating metal.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Silicon Compounds (AREA)
  • Coating With Molten Metal (AREA)
US58270A 1960-09-26 1960-09-26 Method and apparatus for treating metallic strands in hot dip coating Expired - Lifetime US3018190A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US58270A US3018190A (en) 1960-09-26 1960-09-26 Method and apparatus for treating metallic strands in hot dip coating
BE608128A BE608128A (fr) 1960-09-26 1961-09-13 Procédé et appareil pour le traitement de fils métalliques.
GB34512/61A GB918372A (en) 1960-09-26 1961-09-26 Methods and apparatus for treating metallic strands in hot dip coating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US58270A US3018190A (en) 1960-09-26 1960-09-26 Method and apparatus for treating metallic strands in hot dip coating

Publications (1)

Publication Number Publication Date
US3018190A true US3018190A (en) 1962-01-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
US58270A Expired - Lifetime US3018190A (en) 1960-09-26 1960-09-26 Method and apparatus for treating metallic strands in hot dip coating

Country Status (3)

Country Link
US (1) US3018190A (fr)
BE (1) BE608128A (fr)
GB (1) GB918372A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3457097A (en) * 1964-02-10 1969-07-22 Yawata Seitetsu Kk Method of coating ferrous metal with molten aluminum
US4431688A (en) * 1981-03-10 1984-02-14 Kokoku Steel-Wire Ltd. Process and installation for the high-velocity dip-coating of filament like materials

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2216519A (en) * 1938-01-03 1940-10-01 Bundy Tubing Co Making tubing
US2405592A (en) * 1941-06-11 1946-08-13 Arthur J Mauger Process of galvanizing
US2437919A (en) * 1945-07-19 1948-03-16 American Rolling Mill Co Process and means for improving the adherence of aluminum coatings
US2458509A (en) * 1942-08-28 1949-01-11 Interchem Corp Apparatus for tinning steel
US2914423A (en) * 1955-05-12 1959-11-24 Armco Steel Corp Method and apparatus for metallic coating of metallic strands

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2216519A (en) * 1938-01-03 1940-10-01 Bundy Tubing Co Making tubing
US2405592A (en) * 1941-06-11 1946-08-13 Arthur J Mauger Process of galvanizing
US2458509A (en) * 1942-08-28 1949-01-11 Interchem Corp Apparatus for tinning steel
US2437919A (en) * 1945-07-19 1948-03-16 American Rolling Mill Co Process and means for improving the adherence of aluminum coatings
US2914423A (en) * 1955-05-12 1959-11-24 Armco Steel Corp Method and apparatus for metallic coating of metallic strands

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3457097A (en) * 1964-02-10 1969-07-22 Yawata Seitetsu Kk Method of coating ferrous metal with molten aluminum
US4431688A (en) * 1981-03-10 1984-02-14 Kokoku Steel-Wire Ltd. Process and installation for the high-velocity dip-coating of filament like materials

Also Published As

Publication number Publication date
GB918372A (en) 1963-02-13
BE608128A (fr) 1962-01-02

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