US3411082A - Method of measuring the potential difference across a conductive sheet material for controlling the pickling of said sheet - Google Patents

Method of measuring the potential difference across a conductive sheet material for controlling the pickling of said sheet Download PDF

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Publication number
US3411082A
US3411082A US330086A US33008663A US3411082A US 3411082 A US3411082 A US 3411082A US 330086 A US330086 A US 330086A US 33008663 A US33008663 A US 33008663A US 3411082 A US3411082 A US 3411082A
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United States
Prior art keywords
sheet
electrodes
pickling
potential difference
measuring
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Expired - Lifetime
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US330086A
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English (en)
Inventor
Christian Van Den Hove
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Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously

Definitions

  • ABSTRACT OF THE DISCLOSURE This specification discloses a method and apparatus for the control of the descaling of a metallic sheet passing continuously through a pickling bath, wherein the presence or absence of scaling is detected by placing a pair of electrodes in contact with the sheet at spaced locations and recording the potential difference between them when a current flows, and wherein the speed of passage of the sheet through the bath is controlled in order to achieve the dseired degree of descaling at the location of the electrodes.
  • the present invention has been devised more particularly for overcoming this difficulty.
  • the present invention therefore consists in a method of measuring the thickness of an electrically resistant film on a band of conductive material undergoing treatment in a liquid to remove the film.
  • the band is contacted by a pair of electrodes and the potential difference between the electrodes is measured.
  • the invention has been found particularly applicable to the pickling of steel sheet.
  • continuous bands or strips of the steel sheet are passed successively through a number of pickling baths or vats.
  • pickling baths or vats In order to make the invention clear a specific embodiment of it as applied to the pickling of steel sheet in continuous bands will now be described with reference to the attached drawings.
  • FIGURE 1 is a diagrammatic vertical section showing the passage of steel sheet through four consecutive baths.
  • FIGURE 2 is a side view of an electrode support for use in the method in accordance with the invention.
  • FIGURE 3 is a plan view, in a scale somewhat less that that of FIGURE 2, showing the movement of the electrode support.
  • FIGURE 4 is a plan view of the end piece of the 3,411,082 Patented Nov. 12, 1968 "ice electrode support shown in FIGURE 2, the scale being greater than the scale of FIGURE 2.
  • FIGURE 5 is an electrical diagram showing the connection of the electrodes.
  • FIGURES 6, 8 and 9 show diagrammatically the engagement of the steel sheet by the electrodes.
  • FIGURE 7 shows a trace of electrical signals received from two sets of electrodes.
  • FIGURES 10 and 11 show further traces received from two sets of electrodes.
  • steel sheet 5 which has just been rolled after coming from a series of rolling mills, passes in the direction indicated by arrow 6 consecutively through pickling baths 1, 2, 3 and 4 drawn by a pair of drive rolls 6a having a speed control 6b, and then onto a take-up reel 6c.
  • pickling baths 1, 2, 3 and 4 drawn by a pair of drive rolls 6a having a speed control 6b, and then onto a take-up reel 6c.
  • electrodes 19 for sensing the thickness of the film scale oxide are placed at the positions indicated by reference numerals 7 and 8, that is to say between the last and next to last bath and after the last bath.
  • each electrode support 13 has an end piece 14 (see FIGURE 4) in which the electrodes 19 are mounted in vertical holes 15.
  • the electrode support 13 has an upright portion 10 which is mounted in two bearings 11 on a firmly mounted vertical part 9.
  • a gear wheel 12 is keyed on the portion 10 and this gear wheel 12 is driven by a worm (not shown) driven in turn by an automatic mechanism which causes the portion 10 of the electrode support 13 to oscillate about a vertical axis.
  • the automatic mechanism includes limit switches 18 (see FIG- URE 3) which cause the electrode support 13 to be reversed as soon as it has reached one of the extreme positions shown in broken lines radiating from the axis of the part 10.
  • the total angular movement or sweep of the electrode support 13 is somewhat greater than the width of the band of sheet steel 5.
  • the band of sheet steel 5 is somewhat narrower than the baths and can wander from side to side somewhat.
  • the total sweep of the electrode support 13 is indicated by the broken line 17.
  • a jet 27 mounted in a vertical hole 28 in the end piece 14 of the electrodes support 13. Compressed air is supplied to the jet 27 through a flexible tube 26 and the horizontal pipe 25.
  • the two electrodes 19 are, as shown in FIGURE 5, connected with a 1.5 volt DC source 22 of electricity.
  • the voltage across the electrodes 19 is amplified at 23 and fed to a visual indicator 24 such as an oscilloscope or strip recorder.
  • the trace produced at 24 will be as shown by trace 29 in FIGURE 7.
  • the horizontal axis represents time and the vertical axis represents voltage.
  • the portions 31 of the trace 29 correspond to the positions of the electrodes 19 in which the electrodes are not both in contact with the sheet, i.e. the extreme positions indicated by broken lines radiating from the axis of part 10 in FIGURE 3.
  • the parts-33 of the trace 29 indicate that the electrodes 19 are both in contact with the band ;5 and therefore the voltage across the electrodes 19 is
  • the trace 29 is FIGURE 7 indicates the operation of the electrodes placed at the positions 7 in FIGURE 1 while the similar trace 30 in FIGURE 7 indicates the operation of the electrodes placed at position 8 in FIG- URE 1. It will be seen from FIGURE 7 that the trace 30 has portions 34 and 32 corresponding respectively to the portions 33 and 31 of trace 29.
  • FIGURE 8 one electrode 19 is touching the band 5 and another is touching the top of a piece of film 43 so that the voltage between the electrodes 19 will be less than in the situation shown in FIG URE 9 in which neither of the electrodes are able to con tact the band 5.
  • the apparatus is run so that the traces obtained are as shown in FIGURE 11 the metal will be substantially clean at position 8 but will still have a substantial layer of film at position 7. Therefore the passage through the bath 4 will not be wasted.
  • FIGURE shows the case where the passage of the metal through the apparatus is altogether too fast and the filmleft on it at position 8 prevents the electrodes making adequate contact with it to produce level parts 34 of the trace 30.
  • the electrodes can be insulated except at their tips and can be arranged to contact the sheet metal while it is actually below the level of the liquid in one of the baths.
  • a series of fixed sensing devices with electrodes can be arranged in a' row across the sheet for measuring the-potential difference at a given position.
  • the process forming the object' of the invention is especially advantageous when it is used in conjunction with a continuous rolling 'mill.
  • a method of controlling the pickling of a sheet material comprising the steps of: continuously moving an oxide covered metallic sheet'through at least one pickling bath at a controlled speed; applying a pair of electrodes to the surface portion of said sheet emerging from the pickling bath; applying an electric current source to said electrodes; continuously measuring the potential difference between the electrodes while the remaining sheet portion moves through the pickling bath; protiding a source of reference potential difference representing a sheet suitably pickled; comparing and recording said measured potential difference with said reference potential difference; and adjusting the controlled speed of the movement of said sheet through the pickling bath to bring the measured potential difference into line with that of the reference potential difference.
  • step of continuously moving said sheet further comprises the step of continuously. moving said sheet through a succession of pickling baths, and wherein the step of applying said pair of electrodes further comprises the step of applying said pair of electrodes between two of the baths.
  • step of providing a reference potential difference comprises the steps of: applying a further pair of electrodes to the surface of said sheet after it has left the last bath; and applying a further electric current source to said electrodes, whereby a source of reference potential ditference is provided between said further pair of electrodes.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
US330086A 1962-12-20 1963-12-12 Method of measuring the potential difference across a conductive sheet material for controlling the pickling of said sheet Expired - Lifetime US3411082A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE39638 1962-12-20

Publications (1)

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US3411082A true US3411082A (en) 1968-11-12

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US (1) US3411082A (de)
BE (1) BE626376A (de)
DE (1) DE1260923B (de)
GB (1) GB1003454A (de)
LU (1) LU44985A1 (de)
NL (1) NL301782A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990002001A1 (en) * 1988-08-18 1990-03-08 Continental Installers Corporation Process and apparatus for continuous strip pickling
US4996998A (en) * 1988-08-18 1991-03-05 Continental Installers Corporation Strip metal treating system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT404030B (de) * 1995-02-15 1998-07-27 Andritz Patentverwaltung Verfahren zur beize von materialien aus stahl, insbesondere edelstahl
DE19743022A1 (de) * 1997-09-29 1999-04-01 Siemens Ag Verfahren und Einrichtung zum Beizen eines Metallbandes

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1623436A (en) * 1926-06-22 1927-04-05 Int Paper Co Moisture-testing means for paper-making machines
US1815915A (en) * 1929-08-24 1931-07-28 Dennison Mfg Co Gauging thickness of surface coating
US1976487A (en) * 1931-05-06 1934-10-09 Westinghouse Electric & Mfg Co Motor-control system
US2146442A (en) * 1936-06-25 1939-02-07 Hammer Mill Paper Company Measuring apparatus
US2484594A (en) * 1946-10-15 1949-10-11 Honeywell Regulator Co Moisture responsive system
US2545576A (en) * 1948-02-21 1951-03-20 Nat Res Corp Automatic control of evaporated metal film thickness
GB761241A (en) * 1953-08-20 1956-11-14 Murdo Mackenzie Improvements in and relating to the testing of the location of a conductor within an insulating covering
US2793345A (en) * 1953-10-29 1957-05-21 United States Steel Corp Apparatus for measuring the thickness of a coating applied to a moving strip
US2797171A (en) * 1951-04-25 1957-06-25 Western Electric Co Method of uniformly applying lacquer to paper strips
US2811691A (en) * 1954-01-07 1957-10-29 Lockheed Aircraft Corp Film resistance measuring device
US2883895A (en) * 1954-10-15 1959-04-28 Carl A Vossberg Rolling mill thickness control system
US2927871A (en) * 1956-03-26 1960-03-08 Bethlehem Steel Corp Control of pickling baths
US2942352A (en) * 1956-10-26 1960-06-28 Eicken-Estienne Henri Material treating system
US3086889A (en) * 1960-03-21 1963-04-23 Stokes F J Corp Method and apparatus for coating a continuous sheet of material
US3129712A (en) * 1959-06-18 1964-04-21 Beteiligungsund Patentverwaltu Continuous scaling device for metal bands

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1623436A (en) * 1926-06-22 1927-04-05 Int Paper Co Moisture-testing means for paper-making machines
US1815915A (en) * 1929-08-24 1931-07-28 Dennison Mfg Co Gauging thickness of surface coating
US1976487A (en) * 1931-05-06 1934-10-09 Westinghouse Electric & Mfg Co Motor-control system
US2146442A (en) * 1936-06-25 1939-02-07 Hammer Mill Paper Company Measuring apparatus
US2484594A (en) * 1946-10-15 1949-10-11 Honeywell Regulator Co Moisture responsive system
US2545576A (en) * 1948-02-21 1951-03-20 Nat Res Corp Automatic control of evaporated metal film thickness
US2797171A (en) * 1951-04-25 1957-06-25 Western Electric Co Method of uniformly applying lacquer to paper strips
GB761241A (en) * 1953-08-20 1956-11-14 Murdo Mackenzie Improvements in and relating to the testing of the location of a conductor within an insulating covering
US2793345A (en) * 1953-10-29 1957-05-21 United States Steel Corp Apparatus for measuring the thickness of a coating applied to a moving strip
US2811691A (en) * 1954-01-07 1957-10-29 Lockheed Aircraft Corp Film resistance measuring device
US2883895A (en) * 1954-10-15 1959-04-28 Carl A Vossberg Rolling mill thickness control system
US2927871A (en) * 1956-03-26 1960-03-08 Bethlehem Steel Corp Control of pickling baths
US2942352A (en) * 1956-10-26 1960-06-28 Eicken-Estienne Henri Material treating system
US3129712A (en) * 1959-06-18 1964-04-21 Beteiligungsund Patentverwaltu Continuous scaling device for metal bands
US3086889A (en) * 1960-03-21 1963-04-23 Stokes F J Corp Method and apparatus for coating a continuous sheet of material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990002001A1 (en) * 1988-08-18 1990-03-08 Continental Installers Corporation Process and apparatus for continuous strip pickling
US4920995A (en) * 1988-08-18 1990-05-01 Continental Installers Corporation Process for continuous strip pickling
US4996998A (en) * 1988-08-18 1991-03-05 Continental Installers Corporation Strip metal treating system

Also Published As

Publication number Publication date
GB1003454A (en) 1965-09-02
LU44985A1 (de) 1964-02-11
BE626376A (de)
DE1260923B (de) 1968-02-08
NL301782A (de)

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