EP0092309A1 - A method of coating a metal surface so as to render it non-stick and abrasion-resistant - Google Patents

A method of coating a metal surface so as to render it non-stick and abrasion-resistant Download PDF

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Publication number
EP0092309A1
EP0092309A1 EP83301270A EP83301270A EP0092309A1 EP 0092309 A1 EP0092309 A1 EP 0092309A1 EP 83301270 A EP83301270 A EP 83301270A EP 83301270 A EP83301270 A EP 83301270A EP 0092309 A1 EP0092309 A1 EP 0092309A1
Authority
EP
European Patent Office
Prior art keywords
coating
stick
metal surface
molybdenum
stainless steel
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.)
Withdrawn
Application number
EP83301270A
Other languages
German (de)
French (fr)
Inventor
Harry Chapman Johnson
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.)
ARMOURCOTE SURFACE TREATMENTS Ltd
Original Assignee
ARMOURCOTE SURFACE TREATMENTS 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 ARMOURCOTE SURFACE TREATMENTS Ltd filed Critical ARMOURCOTE SURFACE TREATMENTS Ltd
Publication of EP0092309A1 publication Critical patent/EP0092309A1/en
Withdrawn legal-status Critical Current

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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
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
    • B05D5/086—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers having an anchoring layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/60—Adding a layer before coating
    • B05D2350/65—Adding a layer before coating metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified

Definitions

  • This invention relates to a method of coating a metal surface so as to render it non-stick and abrasion-resistant.
  • a known method of applying a non-stick coating to the metal surface of an article includes the steps of preparing the surface in conventional manner to receive a sprayed coating of molten metal, spraying over said surface a coating of stainless steel or molybdenum to provide a continuous and impervious micro-crenellated intermediate surface with microscopic preminences and interstices, abrading said intermediate surfaces to remove any surface film such as oxide, applying a coating of a non-stick agent to the abraded surface and sintering or curing the coating so as to provide a firmly bonded complete covering to the sprayed metal coating.
  • the metal spray is applied to provide an impervious coat on top of which a layer of a non-stick agent, usually P.T.F.E. (polytetrafluoroethylene), is applied. Due to the application of the metal spray, the finished coating lasts longer than a coating of P.T.F.E. applied directly onto the base metal. Nevertheless, in time, the P.T.F.E. coating is worn away from the surface of the sprayed-on metal layer and the non-stick property of the surface diminishes.
  • P.T.F.E. polytetrafluoroethylene
  • An object of the present invention is to provide an improved method of applying a non-stick coating to a metal surface whereby the coating lasts considerably longer than hitherto.
  • the present invention provides a method of coating a metal surface so as to render it non-stick and abrasion-resistant characterised in that the stainless steel or molybdenum b is sprayed onto the metal surface a so as to cover not less than 65% and not more than 90% thereof so that the intermediate substrate is pervious, and in that, prior to application of the non-stick agent, a primer coating is applied to penetrate the intermediate substrate so that a matrix of stainless steel or molybdenum b impregnated with the non-stick agent c is formed on the metal surface a.
  • a base metal surface a to be rendered non-stick is firstly shot or sand blasted (Fig. 1).
  • Stainless steel or molybdenum is flame sprayed onto the base metal surface a so as to cover not less than 65% and not more than 90% of the metal surface a and provide a pervious intermediate substrate b. having a micro-crenellated surface (Fig. 2).
  • the thickness of the pervious substrate b is, for example, between 0.025 and 0.050 mm.
  • a primer of sufficiently low viscosity to penetrate said pervious layer is applied thereto and air or oven dried at about 120°C to 150°C and allowed to cool.
  • the primer may be aqueous-based or resin-based, the latter being used whenever a non-corrosible final non-stick surface is required.
  • a suitable aqueous-based primer would be 10 parts P.T.F.E. to 1 part pigment and a suitable resin-based primer would be 20 parts resin to 24 parts pigment. It will, however, be appreciated that these are only examples and many other mixtures or solutions of differing composition may be useful.
  • a second or top coat consisting primarily of a non-stick agent such as P.T.F.E. or T.F.E./H.F.P. (Tetrafluoro- ethylene/polyhexafluoropropylene), is applied thereover and stored at temperature of 200°C to 450°C for twenty to thirty minutes.
  • a suitable top coat for use after an aqueous-based primer is 16 parts P.T.F.E. to 1 part pigment and a suitable top coat for use after a resin-based primer, when a non-corroding surface is required, is 13 parts P.T.F.E. to 11 parts P.E.S. (polyethyl sulphone).
  • Fig. 3 illustrates the resultant matrix of stainless steel or molybdenum b impregnated and coated with non-stick agent c upon the original metal surface a. This coating lasts considerably longer,i.a. is much more resistant to wear, than any previously known non-stick coating.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Chemically Coating (AREA)
  • Materials For Medical Uses (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

In order to achieve a non-stick surface which is significantly harder wearing than hitherto, metal surface a is sand or shot blast and stainless steel or molybdenum is applied thereto so as to cover not less than 65% and not more than 90% thereof and provide a pervious intermediate substrate b having a micro-crenellated surface. Thereafter, a primer coat is applied to penetrate pervious layer b and finally a top coat, consisting primarily of a nonstick agentc, such as P.T.F.E, is applied so as to form a matrix of stainless steel or molybdenum impregnated with and covered by the non- stick agent.

Description

  • This invention relates to a method of coating a metal surface so as to render it non-stick and abrasion-resistant.
  • A known method of applying a non-stick coating to the metal surface of an article includes the steps of preparing the surface in conventional manner to receive a sprayed coating of molten metal, spraying over said surface a coating of stainless steel or molybdenum to provide a continuous and impervious micro-crenellated intermediate surface with microscopic preminences and interstices, abrading said intermediate surfaces to remove any surface film such as oxide, applying a coating of a non-stick agent to the abraded surface and sintering or curing the coating so as to provide a firmly bonded complete covering to the sprayed metal coating.
  • In the above method, the metal spray is applied to provide an impervious coat on top of which a layer of a non-stick agent, usually P.T.F.E. (polytetrafluoroethylene), is applied. Due to the application of the metal spray, the finished coating lasts longer than a coating of P.T.F.E. applied directly onto the base metal. Nevertheless, in time, the P.T.F.E. coating is worn away from the surface of the sprayed-on metal layer and the non-stick property of the surface diminishes.
  • An object of the present invention is to provide an improved method of applying a non-stick coating to a metal surface whereby the coating lasts considerably longer than hitherto.
  • With this object in view, the present invention provides a method of coating a metal surface so as to render it non-stick and abrasion-resistant characterised in that the stainless steel or molybdenum b is sprayed onto the metal surface a so as to cover not less than 65% and not more than 90% thereof so that the intermediate substrate is pervious, and in that, prior to application of the non-stick agent, a primer coating is applied to penetrate the intermediate substrate so that a matrix of stainless steel or molybdenum b impregnated with the non-stick agent c is formed on the metal surface a.
  • The invention will be described further, by way of example, with reference to the accompanying drawings, in which:
    • Fig. 1 is a sectional elevation of a shot blasted metal surface;
    • Fig. 2 is a similar section after application of a steel or molybdenum coating; and
    • Fig. 3 is a similar section to that shown in Fig. 2 after the application of a coating including a non-stick agent to form an impregnated matrix.
  • In a preferred method in accordance with the invention a base metal surface a to be rendered non-stick is firstly shot or sand blasted (Fig. 1). Stainless steel or molybdenum is flame sprayed onto the base metal surface a so as to cover not less than 65% and not more than 90% of the metal surface a and provide a pervious intermediate substrate b. having a micro-crenellated surface (Fig. 2). The thickness of the pervious substrate b is, for example, between 0.025 and 0.050 mm.
  • Once the intermediate pervious substrate b has cooled, a primer of sufficiently low viscosity to penetrate said pervious layer is applied thereto and air or oven dried at about 120°C to 150°C and allowed to cool. The primer may be aqueous-based or resin-based, the latter being used whenever a non-corrosible final non-stick surface is required. A suitable aqueous-based primer would be 10 parts P.T.F.E. to 1 part pigment and a suitable resin-based primer would be 20 parts resin to 24 parts pigment. It will, however, be appreciated that these are only examples and many other mixtures or solutions of differing composition may be useful.
  • After the primer has dried and cooled, a second or top coat, consisting primarily of a non-stick agent such as P.T.F.E. or T.F.E./H.F.P. (Tetrafluoro- ethylene/polyhexafluoropropylene), is applied thereover and stored at temperature of 200°C to 450°C for twenty to thirty minutes. A suitable top coat for use after an aqueous-based primer is 16 parts P.T.F.E. to 1 part pigment and a suitable top coat for use after a resin-based primer, when a non-corroding surface is required, is 13 parts P.T.F.E. to 11 parts P.E.S. (polyethyl sulphone).
  • The non-stick agent c is able to penetrate right through the pervious substrate b to the metal surface a. Fig. 3 illustrates the resultant matrix of stainless steel or molybdenum b impregnated and coated with non-stick agent c upon the original metal surface a. This coating lasts considerably longer,i.a. is much more resistant to wear, than any previously known non-stick coating.

Claims (5)

1. A method of coating a metal surface to render it non-stick and abrasion-resistant comprising the steps of preparing the surface in conventional manner to receive a coating of molten metal, spraying stainless steel or molybdenum onto said surface to provide an intermediate substrate having a micro-crenellated surface and applying a coating, primarily of non-stick agent, to the intermediate substrate, characterised in that the stainless steel or molybdenum b is sprayed onto the metal surface a so as to cover not less than 65% and not more than 90% thereof so that the intermediate substrate is pervious, and in that, prior to application of the non-stick agent, a primer coating is applied to penetrate the intermediate substrate so that a matrix of stainless steel or molybdenum b impregnated with the non-stick agent c is formed on the metal surface a.
2. A method as claimed in claim 1 wherein the intermediate substrate is between 0.025 mm and 0.050 mm thick.
3. A method as claimed in claims 1 or 2 wherein the primer coat applied to the pervious substrate is air or oven dried at 120°C - 150°C.
4. A method as claimed in any of claims 1 to 3, wherein the non-stick agent is P.T.F.E. or T.P.E/ H.F.P. and the top coat applied to the primer layer is stoved at a temperature of 200°C - 450°C.
5. A non-stick and abrasion-resistant surface coating formed by the method claimed in any preceding claim.
EP83301270A 1982-04-20 1983-03-08 A method of coating a metal surface so as to render it non-stick and abrasion-resistant Withdrawn EP0092309A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8211441 1982-04-20
GB8211441 1982-04-20

Publications (1)

Publication Number Publication Date
EP0092309A1 true EP0092309A1 (en) 1983-10-26

Family

ID=10529807

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83301270A Withdrawn EP0092309A1 (en) 1982-04-20 1983-03-08 A method of coating a metal surface so as to render it non-stick and abrasion-resistant

Country Status (7)

Country Link
EP (1) EP0092309A1 (en)
AU (1) AU1259283A (en)
DE (1) DE3232726A1 (en)
DK (1) DK394582A (en)
ES (1) ES521045A0 (en)
GB (1) GB2118458A (en)
ZA (1) ZA832048B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989001534A1 (en) * 1987-08-20 1989-02-23 Whitford Plastics Limited Thermal spraying of stainless steel
WO2000013807A1 (en) * 1998-09-08 2000-03-16 Impreglon International L.L.C. Surface coating for a substrate and method for producing such a coating
US11148253B2 (en) 2014-06-23 2021-10-19 Les Promotions Atlantiques Inc. /Atlantic Promotions Inc. Cooking utensil with non-stick capability

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3604762A1 (en) * 1985-06-22 1987-01-02 Winfried Heinzel METHOD FOR COATING HOUSEHOLD OBJECTS WITH AN NON-STICKING LAYER AND HOUSEHOLD OBJECT
DE4215594A1 (en) * 1991-05-16 1992-11-19 Tsai Tung Hung METHOD FOR COATING METAL COOKING UTENSILS
DE102019116363A1 (en) 2019-06-17 2020-12-17 Benteler Automobiltechnik Gmbh Method for the production of an armor component for motor vehicles

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU52870A1 (en) * 1966-02-02 1967-03-24
FR1525920A (en) * 1965-11-10 1968-05-24 Device intended for adjusting and centering cycle and motorcycle wheels
FR2055735A1 (en) * 1969-08-05 1971-04-30 Saimap Ste Polymer coated metal surfaces
FR2088574A5 (en) * 1970-04-17 1972-01-07 Tefal Sa Ptfe antiadhesive coating - applied to aluminium base with an intermediate lithium oxide contg layer
FR2114218A5 (en) * 1970-11-20 1972-06-30 Tefal Sa

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE621641A (en) * 1961-08-22
BE635505A (en) * 1962-07-27
GB1057897A (en) * 1963-05-16 1967-02-08 Koichi Mizuno Process for the manufacture of a bearing surface on a steel surface
US3341348A (en) * 1963-12-11 1967-09-12 Chromium Corp Of America Release surfaces and processes
GB1184561A (en) * 1966-03-25 1970-03-18 K & F Treat S Ltd Improvements in or relating to Abrasion Resistant Surfaces.
US3591468A (en) * 1968-05-07 1971-07-06 Daikin Ind Ltd Method of coating metal surfaces with a fluorine-containing polymer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1525920A (en) * 1965-11-10 1968-05-24 Device intended for adjusting and centering cycle and motorcycle wheels
LU52870A1 (en) * 1966-02-02 1967-03-24
FR2055735A1 (en) * 1969-08-05 1971-04-30 Saimap Ste Polymer coated metal surfaces
FR2088574A5 (en) * 1970-04-17 1972-01-07 Tefal Sa Ptfe antiadhesive coating - applied to aluminium base with an intermediate lithium oxide contg layer
FR2114218A5 (en) * 1970-11-20 1972-06-30 Tefal Sa

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989001534A1 (en) * 1987-08-20 1989-02-23 Whitford Plastics Limited Thermal spraying of stainless steel
US5069937A (en) * 1987-08-20 1991-12-03 Whitford Plastics Limited Thermal spraying of stainless steel
WO2000013807A1 (en) * 1998-09-08 2000-03-16 Impreglon International L.L.C. Surface coating for a substrate and method for producing such a coating
US11148253B2 (en) 2014-06-23 2021-10-19 Les Promotions Atlantiques Inc. /Atlantic Promotions Inc. Cooking utensil with non-stick capability

Also Published As

Publication number Publication date
ES8405083A1 (en) 1984-05-16
DE3232726A1 (en) 1983-10-20
AU1259283A (en) 1983-10-27
ES521045A0 (en) 1984-05-16
GB2118458A (en) 1983-11-02
GB8304274D0 (en) 1983-03-23
ZA832048B (en) 1983-12-28
DK394582A (en) 1983-10-21

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19840626

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Inventor name: JOHNSON, HARRY CHAPMAN