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US3661612A - Method of coating a moving metal strip - Google Patents

Method of coating a moving metal strip Download PDF

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Publication number
US3661612A
US3661612A US782259A US3661612DA US3661612A US 3661612 A US3661612 A US 3661612A US 782259 A US782259 A US 782259A US 3661612D A US3661612D A US 3661612DA US 3661612 A US3661612 A US 3661612A
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US
United States
Prior art keywords
percent
strip
powder
liquid
solution
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
US782259A
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English (en)
Inventor
Albert Edward Jackson
Phillip Haydn Hughes
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.)
Saint Gobain PAM UK Ltd
Original Assignee
John Summers and Sons Ltd
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 John Summers and Sons Ltd filed Critical John Summers and Sons Ltd
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Publication of US3661612A publication Critical patent/US3661612A/en
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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
    • C23C24/00—Coating starting from inorganic powder

Definitions

  • a method of coating a moving metal surface comprising forming a dry layer of metallic powder on the surface, thereafter applying a liquid to the said layer, and then passing the layer against a compression roller to compact the powder to the said surface, the said liquid being such as to reduce the extent to which the roller dislodges the powder.
  • the liquid may glaze the surface of the layer to reduce the extent to which the roller dislodges the powder.
  • the liquid may contain a metal hydroxide.
  • the said surface may be the surface of a moving metal strip there being provided a pair of co-operating said compression rollers through the nip of which the strip is passed.
  • the layer is dried after the liquid is applied, before being passed against the said roller.
  • the said liquid may be an aqueous colloidal solution of a substance which gels when suitably hydrated.
  • the liquid may be an aqueous colloidal cellusic solution.
  • the liquid may be an aqueous solution containing sodium carboxy methyl cellulose.
  • the concentration of the sodium carboxy methyl cellulose in the solution is not less than 0.05 percent nor more than 0.6 percent by weight.
  • the said concentration is not less than 0.2 percent nor more than 0.4 percent.
  • the solution may contain starch, at a concentration between 0.2 and 1 percent by weight.
  • the solution may contain Bentonite, at a concentration of not less than 0.5 percent nor more than 2 percent by weight.
  • the solution may contain aluminum hydroxide or nickel hydroxide at a concentration of not less than 0.05 percent nor more than 1 percent by weight.
  • the liquid is applied to the surface at a rate between 2 and 4 cubic centimeters per square foot ofsurface.
  • the invention also provides a metal article having a surface coated by the method or by means of the apparatus set forth above.
  • an apparatus comprising an uncoiler 1 which carries a roll 2 of mild steel strip 3.
  • the strip 3, which is uncoiled from the roll 2, passes over two spaced apart guide tables 4, 5.
  • a shear 6 which may be operated, by means not shown, to shear the strip 3 as required.
  • the strip 3 may pass along a cleaning line (not shown) which may comprise a degreasing bath, where the strip may be subjected to a degreasing liquid while being scrubbed, a cold water rinse, a pickling bath, and a further cold water rinse.
  • a cleaning line (not shown) which may comprise a degreasing bath, where the strip may be subjected to a degreasing liquid while being scrubbed, a cold water rinse, a pickling bath, and a further cold water rinse.
  • the strip 3 After passing through the cleaning line, the strip 3 passes through a bath 7, squeegee rolls 8, and sprays 9 which collectively constitute a wetting station.
  • the bath 7 and the sprays apply to the opposite surfaces of the strip 3 a solution containin g sodium silicate (or, alternatively, potassium silicate) e.g. in a concentration of 1.0 to 5.0 (and preferably of 3) grams of sodium silicate per liter of water.
  • the sodium silicate may be a commercial sodium silicate containing 18 percent w/w sodium oxide, and 36 percent w/w ofsilicon.
  • the bath 7 and squeegee rolls 8 are provided in order to ensure that the strip has already been thoroughly wetted with the sodium or potassium silicate solution before being sprayed therewith, whereby to obtain a more uniform film of the said solution on the strip.
  • the sprays 9 may subject the opposite surfaces of the strip 3 to the said solution in an amount from 0.75 to 2.5 and preferably about 1.5 cubic centimeters of the said solution for each square foot of the adjacent surface. This amount of solution is such as to trap the powder which is subsequently applied to the strip while being insufficient to cause pools of the solution to build up on the strip.
  • the strip 3 After leaving the wetting station 7-9, the strip 3 then passes through a first powder application station constituted by two powder deposition units 10'mounted above the strip 3.
  • the powder deposition units 10 apply aluminum (or other metallic) powder to the upper surface of the strip 3.
  • Each of the powder deposition units 10 comprises a porous meter roll 11 having a peripheral pockets (not shown) which are supplied with powder from a hopper 12.
  • the powder in the said pockets is blown by a stream of air or other gas towards the upper surface of the strip 3.
  • the powder passing towards the .upper surface of the strip 3 passes through electrostatically charged screens 13, the voltage applied to the screens being, for example, approximately 20,000 volts for each inch of distance between the bottom of the screens 13 and the strip 3.
  • the aluminum powder thus falls in an electrostatically charged condition onto the adjacent surface of the strip 3 where it would normally lose its charge and be re-attracted back upwardly were it not trapped by the sodium or potassium silicate solution on the strip.
  • the potassium or sodium silicate prevents oxidation or other corrosion of the aluminum powder by the water in the said solution.
  • Each of the powder deposition units 14 comprises a porous meter roll 15 having peripheral pockets (not shown) which are supplied with powder from a hopper 16, the powder in the said pockets being blown towards the underside of the strip 3 by air or other gas reaching the inner surface of the meter roll 15 through a fluid conduit 17.
  • the meter rolls 15 and strip 3 are earthed, the powder from the meter rolls 15 which is directed towards the strip 3 passing successively through electrically conducting screens 20, 21 of which the screen 21, which is that nearer to the strip 3, is maintained (by means not shown) at a negative or positive potential e.g. a potential of 30 kv.
  • the screen 20, which is that nearer to the meter roll 15, is electrically isolated, but may have an electrostatic charge, e.g. ofl0 kv, induced in it.
  • the strip After passing successively through the wetting station 7-9, the first powder application station 11, and the second powder application station 14, the strip passes to a first drying station 22, at which each ofthe surfaces ofthe strip is dried by passing the strip through a high frequency heater.
  • a first drying station 22 At which each ofthe surfaces ofthe strip is dried by passing the strip through a high frequency heater.
  • the sodium silicate remaining on the strip acts as a binder which prevents the aluminum powder from falling off the strip.
  • the strip 3 then passes between sprays 23, 24 which constitute a liquid application station at which the upper and lower surfaces of the strip are wetted with a liquid whose purpose is indicated below.
  • the strip 3 passes through a second drying station 25 and then a rolling mill 26 which constitutes a compaction station, the rolling mill 26 having rollers 27, 28 between which the strip passes and which compact the aluminum coating to both the surfaces of the strip.
  • the strip 3 is finally coiled onto a roll 30 of a coiler 31 from which it is removed to be heat treated at an elevated temperature e. g. by being heated at 500 C. for 1 hour, or by being heated by 350 C. for 15 hours.
  • the aluminum powder applied to the strip is typically that which passes a 300 mesh sieve.
  • the powder is dispensed by the powder deposition units 10 such that the powder contains a high percentage offines e.g. the powder contains 30 to 40 percent of particles less than 20 microns and 10 to 15 percent of particles less than l0 microns.
  • the sprays 23, 24 are provided.
  • a liquid is applied on top of the layer of powder on the strip, the liquid being such as to reduce the extent to which the rollers dislodge the powder.
  • the liquid applied to the strip by the sprays 23, 24 may be an aqueous colloidal solution of a substance which gels when suitably hydrated.
  • a substance which gels when suitably hydrated examples of such substances are nickel hydroxide, aluminum hydroxide, or a water soluble cellusic material such as sodium carboxy methyl cellulose.
  • the strip may pass at, for. example, 60 ft. per minute or even 100 ft. per minute, whereas if this wetting is omitted, it may be necessary to limit the speed of the strip to, say, 30-35 ft. per minute. r
  • the sprays 23, 24 may be such as to apply from 2.0 to 4.0 (and preferably about 3.0) cubic centimeters per square foot of solution to each side of the strip.
  • concentration thereof in the said solution should be within the range of about 0.05 to 0.6 percent by weight of the solution.
  • concentration is not less than 0.2 percent nor more than 0.4 percent by weight.
  • the concentration of the solution preferably is within the range 0.05 to 1 percent by weight.
  • Another substance that has been successfully used is starch in an aqueous colloidal solution of a concentration not less than 0.2 percent nor more than l percent by weight.
  • The-concentration is preferably 0.5 percent by weight.
  • Bentonite is also satisfactory when used in an aqueous colloidal solution of concentration not less than 0.5 percent nor more than 2 percent by weight.
  • concentration is preferably l percent by weight.
  • silicate 2 ce./sq. it. 0.2% sodium carboxy methyl colluslose so-' 40 Do.
  • sodium silicate instead of sodium silicate.
  • the maximum concentration of such as indicated. previously was sprayed on top of the dried sodium carboxy methyl cellulose acceptable is about 0.2 per- 7 cent by weight.
  • sodium carboxy methyl cellulose has the same disadvantages as indicated for sodium silicate.
  • increased concentrations of sodium silicate or particularly sodium carboxy methyl cellulose may be advantageous in that the layer of powder is less likely to be dislodged before compaction due to vibration ofthe steel strip.
  • the powder layer acts as a filter for the solutions applied via the sprays 23, 24.
  • Two mechanisms appear possible. Either the powder layer absorbs water from the solutions so that the remaining solution either gels or becomes too viscous to flow to the layer-to-substrate interface. Alternatively, the powder layer filters out the solids in the solution and allows only water to approach the interface.
  • the wetting station I -9, the first powder application station 11, the second powder application station 14, the first drying station 22, the liquid application station 23, 24, the second drying station 25, and the compaction station 26 are absolutely in line with each other so that the strip 3 when passing through these stations does not have its direction of travel altered.
  • the uncoiler l and the coiler 31 are also substantially in line with the various stations 7-9, ll, 14, 22, 23, 24, 25 and 26. This arrangement reduces the number of guide rolls over which it is necessary for the strip 3 to pass, and therefore reduces the extent to which dirt can readily be picked up by the strip 3. It is very desirable to limit transference of dirt to the strip, since such dirt can have an adverse effect upon the adhesion developed between the coating and the strip during the final heat treatment.
  • the invention can be employed to coat moving metal surfaces other than the surfaces of a strip.
  • wire or rod can be similarly coated.
  • a method of coating a moving metal surface comprising the steps of forming a dry layer of metallic powder on the surface, thereafter applying to the said layer, an aqueous liquid of a substance which gels when suitably hydrated and allowing the water thereof to penetrate the metallic powder layer, and then passing the metallic powder layer at a speed of at least 35 feet per minute against a compression roller to compact the powder to the said metal surface, the said liquid acting to reduce the extent to which the roller dislodges the powder.
  • a method as claimed in claim 1 comprising drying the layer after the liquid is applied, before passing it against the said roller.
  • a method as claimed in claim 6 wherein the concentration of the sodium carboxy methyl cellulose in the solution is not less than 0.05 percent nor more than 0.6 percent by weight.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Peptides Or Proteins (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Powder Metallurgy (AREA)
US782259A 1967-12-14 1968-12-09 Method of coating a moving metal strip Expired - Lifetime US3661612A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB56871/67A GB1214158A (en) 1967-12-14 1967-12-14 Method of coating a moving metal strip

Publications (1)

Publication Number Publication Date
US3661612A true US3661612A (en) 1972-05-09

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US782259A Expired - Lifetime US3661612A (en) 1967-12-14 1968-12-09 Method of coating a moving metal strip

Country Status (7)

Country Link
US (1) US3661612A (fr)
JP (1) JPS4925522B1 (fr)
BE (1) BE725232A (fr)
DE (2) DE1814621A1 (fr)
FR (1) FR1596022A (fr)
GB (1) GB1214158A (fr)
NL (2) NL6818011A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3775151A (en) * 1970-05-06 1973-11-27 Nat Steel Corp Process for preparing chromized ferrous metal sheet material and the resultant articles
US3781968A (en) * 1971-06-16 1974-01-01 Nippon Kokan Kk Method for manufacturing steel sheets with layers of protective metal
US3845539A (en) * 1971-06-16 1974-11-05 Nippon Kokan Kk Apparatus for manufacturing steel sheets with layers of protective metal
US3884729A (en) * 1972-11-03 1975-05-20 British Steel Corp Method of providing an aluminum coating on a steel substrate
CN1043513C (zh) * 1993-02-05 1999-06-02 昆明工学院 金属复合材料的制备方法
US20030115730A1 (en) * 2000-01-19 2003-06-26 Ament Peter Conrad Hubert Laminate of metal powder and foaming agent between two metal layers
WO2007090326A1 (fr) * 2006-02-11 2007-08-16 Anshan Falan Steel Strip Co., Ltd. Chaîne de production automatique de production de bande d'acier d'emballage de haute tenue à revêtement coloré mettant en oeuvre un procédé de non refroidissement rapide
CN103639699A (zh) * 2013-11-15 2014-03-19 四川银河钢结构工程有限公司 一种精密自动纵向分条设备
CN106914389A (zh) * 2017-04-27 2017-07-04 浙江明泉工业装备科技有限公司 钢制工件连续式粉末涂装生产方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2229783A1 (en) * 1973-05-14 1974-12-13 Union Carbide Corp Coating metal substrates - with a porous metal layer

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1823869A (en) * 1926-09-11 1931-09-15 Baur Walter Coating of bodies with metal
US2178529A (en) * 1936-05-01 1939-10-31 Chrysler Corp Bearing manufacture
US2877738A (en) * 1954-03-01 1959-03-17 Heck Friedrich Apparatus for rolling metallic powder on a strip
US3231971A (en) * 1961-01-19 1966-02-01 Inland Steel Co Method of producing fusion coated metal base
US3364057A (en) * 1963-06-17 1968-01-16 British Iron Steel Research Metal hydroxide intermediate coating for metal
US3382085A (en) * 1963-01-17 1968-05-07 Head Wrightson & Co Ltd Cladding of strip material
US3428472A (en) * 1963-10-14 1969-02-18 Kobe Steel Ltd Method for forming metal coatings
US3485654A (en) * 1966-03-15 1969-12-23 Nat Steel Corp Method of preparing metal coated metallic substrates

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1823869A (en) * 1926-09-11 1931-09-15 Baur Walter Coating of bodies with metal
US2178529A (en) * 1936-05-01 1939-10-31 Chrysler Corp Bearing manufacture
US2877738A (en) * 1954-03-01 1959-03-17 Heck Friedrich Apparatus for rolling metallic powder on a strip
US3231971A (en) * 1961-01-19 1966-02-01 Inland Steel Co Method of producing fusion coated metal base
US3382085A (en) * 1963-01-17 1968-05-07 Head Wrightson & Co Ltd Cladding of strip material
US3364057A (en) * 1963-06-17 1968-01-16 British Iron Steel Research Metal hydroxide intermediate coating for metal
US3428472A (en) * 1963-10-14 1969-02-18 Kobe Steel Ltd Method for forming metal coatings
US3485654A (en) * 1966-03-15 1969-12-23 Nat Steel Corp Method of preparing metal coated metallic substrates

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3775151A (en) * 1970-05-06 1973-11-27 Nat Steel Corp Process for preparing chromized ferrous metal sheet material and the resultant articles
US3781968A (en) * 1971-06-16 1974-01-01 Nippon Kokan Kk Method for manufacturing steel sheets with layers of protective metal
US3845539A (en) * 1971-06-16 1974-11-05 Nippon Kokan Kk Apparatus for manufacturing steel sheets with layers of protective metal
US3884729A (en) * 1972-11-03 1975-05-20 British Steel Corp Method of providing an aluminum coating on a steel substrate
CN1043513C (zh) * 1993-02-05 1999-06-02 昆明工学院 金属复合材料的制备方法
US20030115730A1 (en) * 2000-01-19 2003-06-26 Ament Peter Conrad Hubert Laminate of metal powder and foaming agent between two metal layers
US7037453B2 (en) * 2000-01-19 2006-05-02 Corus Aluminium Walzprodukte Gmbh Laminate of metal powder and foaming agent between two metal layers
WO2007090326A1 (fr) * 2006-02-11 2007-08-16 Anshan Falan Steel Strip Co., Ltd. Chaîne de production automatique de production de bande d'acier d'emballage de haute tenue à revêtement coloré mettant en oeuvre un procédé de non refroidissement rapide
CN100431776C (zh) * 2006-02-11 2008-11-12 鞍山市发蓝钢带有限责任公司 采用非调质工艺生产高强度彩涂包装钢带的自动化生产线
CN103639699A (zh) * 2013-11-15 2014-03-19 四川银河钢结构工程有限公司 一种精密自动纵向分条设备
CN106914389A (zh) * 2017-04-27 2017-07-04 浙江明泉工业装备科技有限公司 钢制工件连续式粉末涂装生产方法

Also Published As

Publication number Publication date
FR1596022A (fr) 1970-06-15
JPS4925522B1 (fr) 1974-07-01
DE1814608A1 (de) 1969-07-24
NL141581B (nl) 1974-03-15
NL6818011A (fr) 1969-06-17
DE1814608B2 (fr) 1979-05-10
NL6818012A (fr) 1969-06-17
BE725232A (fr) 1969-05-16
GB1214158A (en) 1970-12-02
DE1814621A1 (de) 1969-07-31

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