US3884727A - Method of coating wire screen cloth - Google Patents

Method of coating wire screen cloth Download PDF

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Publication number
US3884727A
US3884727A US317335A US31733572A US3884727A US 3884727 A US3884727 A US 3884727A US 317335 A US317335 A US 317335A US 31733572 A US31733572 A US 31733572A US 3884727 A US3884727 A US 3884727A
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Prior art keywords
screen cloth
wire screen
coating
wire
chromic
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US317335A
Inventor
Louis John Jacobs
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Premier Refractories and Chemicals Inc
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Combustion Engineering Inc
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Application filed by Combustion Engineering Inc filed Critical Combustion Engineering Inc
Priority to US317335A priority Critical patent/US3884727A/en
Priority to CA178,380A priority patent/CA1002827A/en
Priority to DE19732360466 priority patent/DE2360466C3/en
Priority to GB5884373A priority patent/GB1419288A/en
Priority to JP48142935A priority patent/JPS4991048A/ja
Application granted granted Critical
Publication of US3884727A publication Critical patent/US3884727A/en
Assigned to VFR, INC., 901 EAST 8TH AVENUE, KING OF PRUSSIA, PA. 19406, A DE. CORP. reassignment VFR, INC., 901 EAST 8TH AVENUE, KING OF PRUSSIA, PA. 19406, A DE. CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: COMBUSTION ENGINEERING, INC.
Assigned to PREMIER REFRACTORIES AND CHEMICALS INC., reassignment PREMIER REFRACTORIES AND CHEMICALS INC., ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE 10-28-88 Assignors: VFR, INC.,
Assigned to CONTINENTAL BANK N.A., A NATIONAL BANKING ASSOCIATION reassignment CONTINENTAL BANK N.A., A NATIONAL BANKING ASSOCIATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PREMIER REFRACTORIES AND CHEMICALS INC.
Assigned to CONTINENTAL BANK N.A. reassignment CONTINENTAL BANK N.A. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AMERICAN PREMIER, INC., A DE CORP.
Assigned to PREMIER REFRACTORIES AND CHEMICALS INC., A DE CORP. reassignment PREMIER REFRACTORIES AND CHEMICALS INC., A DE CORP. RELEASE BY SECURED PARTY OF A SECURITY AGREEMENT RECORDED AT REEL 5125 FRAME 0289 Assignors: CONTINENTAL BANK N.A.
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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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
    • C23C22/74—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process for obtaining burned-in conversion coatings
    • 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
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2915—Rod, strand, filament or fiber including textile, cloth or fabric
    • 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
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
    • Y10T442/102—Woven scrim
    • Y10T442/109—Metal or metal-coated fiber-containing scrim

Definitions

  • ABSTRACT Wire cloth screen is coated with an abrasive and cor- 521 US. Cl. l48/6.2; 117/99; 148/315 rosive resistant material y immersing the wire cloth [51] Int. Cl. C23c 1/10 into a Chromic acid Solution and then heating to form [58] Field of Search 148/6.l6, 31.5, 6.2; a hard chromic Oxide, coating- The coating Process 7 99; 1 2/34 199 may be repeated to obtain the desired coating thickness. The coating serves to bond the wires together at 5 References Cited the points of intersection and the heating stress re- UNITED STATES PATENTS 12/1951 Cohen 204/42 lieves the wire.
  • Wire screen cloth is used for many purposes and is often subjected to abrasion, impact and corrosive, conditions.
  • wire screen cloth is used classifying equipment to separate materials according to particle size and abrasion can be a seriou's problem.
  • the screens are usually vibrated or moved in some manner to produce relative motion between the screen and, the particles. The material moving on the *screen abrades the screen and the most serious wear occurs at,the intersections of the wires. At these intersections fine particles become lodged between the two wires and the abrasive action of the particles causes rapid destruction of the wire.
  • wire screen cloth the wires are straightened, crimp'ed, or formed into special shapes and woven into the desired pattern on the weaving machine. This processing of the wire work hardens the metal.
  • the work hardened wire resists abrasive action but it is also subject to more rapid failure by fatigue. It would therefore be desirable to anneal the wire to increase its elastic limit. 7
  • An object of the present invention is to treat wire' screen cloth so as to provide a coating thereon which will also bond the wires together at the intersection. Another object of the invention is to bond the wires together' to prevent the abrasive action at the point of contact of the wires and to increase the load bearing properties. A further object-of the invention is to provide such a coating on the wire screen cloth which will be abrasive and corrosive resistant.
  • Wire screen cloth to be treated in accordance with the present invention is first cleaned to remove any grease or oil from the surface. Also, if the wire is excessively oxidized, the oxide is removed such as by an acid treatment and then slightly re-oxidized by rapidly heating and then cooling. This re-oxidation step forms a porous oxidizing layer. The wire is then immersed in a chromic acid solution which penetrates the oxide layer on the wire surface. The wire screen cloth is then removed from the solution and heated to convert the chromic acid to chromicoxide according to the following reaction:
  • This heat treating process produces a strong oxide bond between the porous oxidized layer and the base metal of the wire.
  • the immersion-heating cycle is repeated as many times as desired to produce the desired coating thickness and to densify the porous oxide surface. Since chromic oxide is a very hard material having a hardness of 9.3 on the Moh scale, this densified coating on the metal makes it resistant to abrasion.
  • Chromium trioxideTechnical grade i Water to produce a solution with a specific gravity of Solution B is prepared by dissolving the chromium trioxide in'the water, bringing'the solution to a slow boil, and very slowly adding the'activated charcoal while stirring. Although the exact reaction which takes place is: not known, it is believed that the heating of the solutionwwi th the activated charcoal removes some of theoxygenzwhich leaves the solution ascai'bon dioxide with the Cro radicals linking to forrnlachain.
  • the compounds which-are formed are thought to contain CrO radicals and hexavalent chromium which are re..- ferred to as chromyl compounds, Slow boilingis con ⁇ tinued until no noticeable chemical reactiorris taking place. The resulting solution has an increased viscosity,
  • Typical Range Alumina Alcoa T-61 minus 325 mesh
  • 61 lbs. 40-80 lbs.
  • Silica (minus mesh) 39 lbs. 20-60 lbs.
  • the effect of the addition of zinc oxide is to increase the viscosity of the solution so that thicker coatings are applied in each treatment step.
  • the alumina and silica are also added to produce a suitable consistency for coating the wire. The amount of each is balanced to produce a coating in which the thermal expansion and elasticity of the coating is very similar to that of the base material.
  • the wires can initially be coated with either Solution A or Solution B.
  • the preferred procedure is to first coat with Solution A and then to increase the thickness of the coating by using Solution B until the desired thickness has been obtained.
  • the coating thickness can be increased more rapidly by using Solution C, preferably after three initial coatings with Solutions A and/or B.
  • Solution C would not normally be suitable for fine mesh screens since it builds up a thick coating rapidly and would greatly reduce the opening size of the smaller screen.
  • a specific gravity of 1.7 has been referred to in the above examples, these specific gravities can be adjusted anywhere from 1.66
  • the wire Screen cloth with the coating of chromic acid thereon is then heated to about 650 to l,200F such as by induction or radiant heat which converts the chromic acid to chromic oxide.
  • the specific curing temperature would depend upon the base metal of the screen and the effect of the temperature on the heat treatment of that metal.
  • the wire screen cloth is then cooled to 350F or below and immersed in the desired chromic acid solution again.
  • the wire screen cloth is then heated to form another layer of chromic oxide. Since the chromic acid solution readily wets the wire screen cloth and penetrates the porous oxide layer on the wire, a strong bond is formed between the chromic oxide, the oxide layer on the wire and the base metal.
  • the chromic oxide layer which is formed on the wire is very dense, smooth and abrasion resistant.
  • Theoxide coating bonds the wires together which strengthens and reinforces the wire screen cloth thereby increasing the load bearing capacity.
  • the heating of the wire screen cloth to convert the chromic acid to chromic oxide also relieves the stresses induced into the wire structure during drawing, straightening, crimping and weaving of the wire cloth. This greatly increases the fatigue resistance of the wire. For example, it has been found that a wire screen cloth treated in accordance with the present invention and installed on electrically vibrating screening machine will last 25 percent longer than the same untreated wire screen cloth. This test was run with a fixed load on the wire screen cloth so that only the fatigue resistant factor could be evaluated.
  • a method of treating wire screen cloth so as to form a coating thereon containing chromic oxide and to bond the wires together at the points of intersection comprising the steps of:
  • said chromic acid solution is a solution prepared by the process of disolving chromium trioxide in water, slowly boiling said solution, adding activated charcoal to said solution in the ratio of l to 20 pounds activated charcoal to 266 pounds chromium trioxide, and continuing said slow boiling until no noticeable reaction is taking place.

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  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

Wire cloth screen is coated with an abrasive and corrosive resistant material by immersing the wire cloth into a chromic acid solution and then heating to form a hard chromic oxide coating. The coating process may be repeated to obtain the desired coating thickness. The coating serves to bond the wires together at the points of intersection and the heating stress relieves the wire.

Description

United States Patent Jacobs May 20, 1975 [54] METHOD OF COATING WIRE SCREEN 3,640,776 2/1972 Hanes 148/6.16 CLOTH 3,687,738 8/1972 Malkin 148/62 3,717,509 2/1973 Palm et al..... l48/6.l6 [75] Inventor: Louis John Jacobs, Chicago, I11. I [73] Assignee: Combustion Engineering, Inc., Primary Examinerl-eon Rosdol Wi C Assistant Examiner-Edith L. Rollins Attorney, Agent, or FirmRichard H. Berneike [22] Flledz Dec. 21, 1972 [21] Appl. No.: 317,335 [57] ABSTRACT Wire cloth screen is coated with an abrasive and cor- 521 US. Cl. l48/6.2; 117/99; 148/315 rosive resistant material y immersing the wire cloth [51] Int. Cl. C23c 1/10 into a Chromic acid Solution and then heating to form [58] Field of Search 148/6.l6, 31.5, 6.2; a hard chromic Oxide, coating- The coating Process 7 99; 1 2/34 199 may be repeated to obtain the desired coating thickness. The coating serves to bond the wires together at 5 References Cited the points of intersection and the heating stress re- UNITED STATES PATENTS 12/1951 Cohen 204/42 lieves the wire.
4 Claims, No Drawings 1 METHOD OF COATING WIRE SCREEN CLOTH BACKGROUND OF THE INVENTION Wire screen cloth is used for many purposes and is often subjected to abrasion, impact and corrosive, conditions. For example, wire screen cloth is used classifying equipment to separate materials according to particle size and abrasion can be a seriou's problem. The screens are usually vibrated or moved in some manner to produce relative motion between the screen and, the particles. The material moving on the *screen abrades the screen and the most serious wear occurs at,the intersections of the wires. At these intersections fine particles become lodged between the two wires and the abrasive action of the particles causes rapid destruction of the wire. i
During the formation of wire screen cloth, the wires are straightened, crimp'ed, or formed into special shapes and woven into the desired pattern on the weaving machine. This processing of the wire work hardens the metal. The work hardened wire resists abrasive action but it is also subject to more rapid failure by fatigue. It would therefore be desirable to anneal the wire to increase its elastic limit. 7
SUMMARY OF THE INVENTION An object of the present invention is to treat wire' screen cloth so as to provide a coating thereon which will also bond the wires together at the intersection. Another object of the invention is to bond the wires together' to prevent the abrasive action at the point of contact of the wires and to increase the load bearing properties. A further object-of the invention is to provide such a coating on the wire screen cloth which will be abrasive and corrosive resistant. These and other objects of the present invention are obtained by treating the wire screen cloth to form a hard chromic oxide coating thereon which also bonds together the wires at the intersections. The formation of the chromic oxide coating involves a heating process which has the additional advantage of annealing the wire screen cloth.
DESCRIPTION OF THE PREFERRED EMBODIMENT Wire screen cloth to be treated in accordance with the present invention is first cleaned to remove any grease or oil from the surface. Also, if the wire is excessively oxidized, the oxide is removed such as by an acid treatment and then slightly re-oxidized by rapidly heating and then cooling. This re-oxidation step forms a porous oxidizing layer. The wire is then immersed in a chromic acid solution which penetrates the oxide layer on the wire surface. The wire screen cloth is then removed from the solution and heated to convert the chromic acid to chromicoxide according to the following reaction:
4Cr0 2Cr O 30 This heat treating process produces a strong oxide bond between the porous oxidized layer and the base metal of the wire. The immersion-heating cycle is repeated as many times as desired to produce the desired coating thickness and to densify the porous oxide surface. Since chromic oxide is a very hard material having a hardness of 9.3 on the Moh scale, this densified coating on the metal makes it resistant to abrasion.
Examples of three different types of chromic acid solu tionsfor coating the wirescreen cloth are as follows:
.SOLUTION A Chromium trioxideTechnical grade i Water to produce a solution with a specific gravity of Solution B is prepared by dissolving the chromium trioxide in'the water, bringing'the solution to a slow boil, and very slowly adding the'activated charcoal while stirring. Although the exact reaction which takes place is: not known, it is believed that the heating of the solutionwwi th the activated charcoal removes some of theoxygenzwhich leaves the solution ascai'bon dioxide with the Cro radicals linking to forrnlachain. The compounds which-are formed are thought to contain CrO radicals and hexavalent chromium which are re..- ferred to as chromyl compounds, Slow boilingis con} tinued until no noticeable chemical reactiorris taking place. The resulting solution has an increased viscosity,
SOLUTION C Typical Range 2 Chromium Trioxide, Technical Grade 100.00 lbs. Zinc Oxide, Technical Grade 16.3 lbs. lO-2O lbs. Water to produce a solution with a specific gravity of 1.7
Then add a mixture of:
Typical Range Alumina (Alcoa T-61 minus 325 mesh) 61 lbs. 40-80 lbs. Silica (minus mesh) 39 lbs. 20-60 lbs.
The effect of the addition of zinc oxide is to increase the viscosity of the solution so that thicker coatings are applied in each treatment step. The alumina and silica are also added to produce a suitable consistency for coating the wire. The amount of each is balanced to produce a coating in which the thermal expansion and elasticity of the coating is very similar to that of the base material.
It has been found that the wires can initially be coated with either Solution A or Solution B. However, the preferred procedure is to first coat with Solution A and then to increase the thickness of the coating by using Solution B until the desired thickness has been obtained. For screens coarser than 6 mesh, the coating thickness can be increased more rapidly by using Solution C, preferably after three initial coatings with Solutions A and/or B. Solution C would not normally be suitable for fine mesh screens since it builds up a thick coating rapidly and would greatly reduce the opening size of the smaller screen. Although a specific gravity of 1.7 has been referred to in the above examples, these specific gravities can be adjusted anywhere from 1.66
to 1.75'. However the specific gravity of 1.70 is the most ideal value for impregnation.
The wire Screen cloth with the coating of chromic acid thereon is then heated to about 650 to l,200F such as by induction or radiant heat which converts the chromic acid to chromic oxide. The specific curing temperature would depend upon the base metal of the screen and the effect of the temperature on the heat treatment of that metal. The wire screen cloth is then cooled to 350F or below and immersed in the desired chromic acid solution again. The wire screen cloth is then heated to form another layer of chromic oxide. Since the chromic acid solution readily wets the wire screen cloth and penetrates the porous oxide layer on the wire, a strong bond is formed between the chromic oxide, the oxide layer on the wire and the base metal.
The chromic oxide layer which is formed on the wire is very dense, smooth and abrasion resistant. Theoxide coating bonds the wires together which strengthens and reinforces the wire screen cloth thereby increasing the load bearing capacity. The heating of the wire screen cloth to convert the chromic acid to chromic oxide also relieves the stresses induced into the wire structure during drawing, straightening, crimping and weaving of the wire cloth. This greatly increases the fatigue resistance of the wire. For example, it has been found that a wire screen cloth treated in accordance with the present invention and installed on electrically vibrating screening machine will last 25 percent longer than the same untreated wire screen cloth. This test was run with a fixed load on the wire screen cloth so that only the fatigue resistant factor could be evaluated.
While preferred embodiments of the present invention have been described, it will be understood that these are merely illustrative and that changes may be made without departing from the invention as claimed.
What is claimed is:
l. A method of treating wire screen cloth so as to form a coating thereon containing chromic oxide and to bond the wires together at the points of intersection comprising the steps of:
a. providing a wire screen cloth, the wires of said wire screen cloth having a thin porous oxide layer thereon;
b. coating said wire screen cloth with a chromic acid solution; and
c. heating said wire screen cloth to a temperature sufficient to convert said chromic acid solution to chromic oxide and to heat treat said wire whereby a coating of chromic oxide is formed on said wires and said wires at the points of intersection are bonded together with chromic oxide.
2. A method of treating wire screen cloth as recited in claim 1 and further including the steps of repeating said coating step (b) and said heating step (c) at least one additional time to form additional coatings of chromic oxide thereon.
3. A method as recited in claim 1 wherein said chromic acid solution has a specific gravity of from 1.66 to 1.75.
in claim 1 wherein said chromic acid solution is a solution prepared by the process of disolving chromium trioxide in water, slowly boiling said solution, adding activated charcoal to said solution in the ratio of l to 20 pounds activated charcoal to 266 pounds chromium trioxide, and continuing said slow boiling until no noticeable reaction is taking place.
4. A method of treating wire screen cloth as recited

Claims (4)

1. A METHOD OF TREATING WIRE SCREEN CLOTH SO AS TO FORM A COATING THEREON CONTAINING CHROMIC OXIDE AND TO BOND THE WIRES TOGETHER AT POINTS OF INTERSECTION COMPRISING THE STEPS OF: A. PROVIDING A WIRE SCREEN CLOTH, THE WIRES OF SAID WIRE SCREEN CLOTH HAVING A THIN POROUS OXIDE LAYER THEREON; B. COATING SAID WIRE SCREEN CLOTH WITH A CHROMIC ACID SOLUTION; AND C. HEATING SAID WIRE SCREEN CLOTH TO A TEMPERATURE SUFFICIENT TO CONVERT SAID CHROMIC ACID SOLUTION TO CHROMIC OXIDE ANDTO HEAT TREAT SAID WIRE WHEREBY A COATING OF CHROMIC OXIDE IS FORMED ON SAID WIRES AND SAID WIRES AT THE POINTS OF INTERSECTION ARE BONDED TOGETHER WITH CHROMIC OXIDE.
2. A method of treating wire screen cloth as recited in claim 1 and further including the steps of repeating said coating step (b) and said heating step (c) at least one additional time to form additional coatings of chromic oxide thereon.
3. A method as recited in claim 1 wherein said chromic acid solution has a specific gravity of from 1.66 to 1.75.
4. A method of treating wire screen cloth as recited in claim 1 wherein said chromic acid solution is a solution prepared by the process of disolving chromium trioxide in water, slowly boiling said solution, adding activated charcoal to said solution in the ratio of 1 to 20 pounds activated charcoal to 266 pounds chromium trioxide, and continuing said slow boiling until no noticeable reaction is taking place.
US317335A 1972-12-21 1972-12-21 Method of coating wire screen cloth Expired - Lifetime US3884727A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US317335A US3884727A (en) 1972-12-21 1972-12-21 Method of coating wire screen cloth
CA178,380A CA1002827A (en) 1972-12-21 1973-08-09 Method of coating wire screen cloth
DE19732360466 DE2360466C3 (en) 1972-12-21 1973-12-05 Process for producing a protective layer on a metal wire gauze by treatment with a chromic acid solution
GB5884373A GB1419288A (en) 1972-12-21 1973-12-19 Method for treating wire secreen cloth
JP48142935A JPS4991048A (en) 1972-12-21 1973-12-20

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JP (1) JPS4991048A (en)
CA (1) CA1002827A (en)
GB (1) GB1419288A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276342A (en) * 1979-06-07 1981-06-30 Johnson Elwood O Moisture proof matting
US4919256A (en) * 1988-01-30 1990-04-24 Gebhardt Fordertechnik Gmbh Loading roller conveyor with drive via intermediate rollers
EP0562752A1 (en) * 1992-03-23 1993-09-29 Xerox Corporation A method and apparatus for dip coating an article having large open areas or a multiplicity of apertures
US5266428A (en) * 1992-04-20 1993-11-30 Xerox Corporation Method for fabricating an electrically conductive article of manufacture

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62222084A (en) * 1986-02-28 1987-09-30 Toshiba Corp Steel parts
KR920003562B1 (en) * 1986-03-31 1992-05-04 가부시끼가이샤 도시바 Non-ferrous metal mechanical part having a wear resistant and smooth surface

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578400A (en) * 1947-03-29 1951-12-11 Charles C Cohn Method for providing oxide coating on aluminum and its alloys
US3640776A (en) * 1969-09-10 1972-02-08 Armco Steel Corp Coated wire for use in prestressed concrete structures and method of producing same
US3687738A (en) * 1970-12-10 1972-08-29 Diamond Shamrock Corp Coated metal and method
US3717509A (en) * 1970-11-06 1973-02-20 Diamond Shamrock Corp Coated metal and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578400A (en) * 1947-03-29 1951-12-11 Charles C Cohn Method for providing oxide coating on aluminum and its alloys
US3640776A (en) * 1969-09-10 1972-02-08 Armco Steel Corp Coated wire for use in prestressed concrete structures and method of producing same
US3717509A (en) * 1970-11-06 1973-02-20 Diamond Shamrock Corp Coated metal and method
US3687738A (en) * 1970-12-10 1972-08-29 Diamond Shamrock Corp Coated metal and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276342A (en) * 1979-06-07 1981-06-30 Johnson Elwood O Moisture proof matting
US4919256A (en) * 1988-01-30 1990-04-24 Gebhardt Fordertechnik Gmbh Loading roller conveyor with drive via intermediate rollers
EP0562752A1 (en) * 1992-03-23 1993-09-29 Xerox Corporation A method and apparatus for dip coating an article having large open areas or a multiplicity of apertures
US5460859A (en) * 1992-03-23 1995-10-24 Xerox Corporation Method and system for dip coating an article having large open areas or a multiplicity of apertures
US5266428A (en) * 1992-04-20 1993-11-30 Xerox Corporation Method for fabricating an electrically conductive article of manufacture

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GB1419288A (en) 1975-12-31
JPS4991048A (en) 1974-08-30
DE2360466A1 (en) 1974-07-11
CA1002827A (en) 1977-01-04
DE2360466B2 (en) 1975-08-14

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