GB2225737A - Corrosion protection methods - Google Patents

Corrosion protection methods Download PDF

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Publication number
GB2225737A
GB2225737A GB8924803A GB8924803A GB2225737A GB 2225737 A GB2225737 A GB 2225737A GB 8924803 A GB8924803 A GB 8924803A GB 8924803 A GB8924803 A GB 8924803A GB 2225737 A GB2225737 A GB 2225737A
Authority
GB
United Kingdom
Prior art keywords
lacquer
aluminium
wheel rims
protective
coating
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Withdrawn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
GB8924803A
Other versions
GB8924803D0 (en
Inventor
R Willi Schwenger
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.)
ATS Leichtmetallraeder GmbH
Original Assignee
ATS Leichtmetallraeder GmbH
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 ATS Leichtmetallraeder GmbH filed Critical ATS Leichtmetallraeder GmbH
Publication of GB8924803D0 publication Critical patent/GB8924803D0/en
Publication of GB2225737A publication Critical patent/GB2225737A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B3/00—Disc wheels, i.e. wheels with load-supporting disc body
    • B60B3/06—Disc wheels, i.e. wheels with load-supporting disc body formed by casting
    • 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
    • B05D7/53—Base coat plus clear coat type
    • B05D7/536—Base coat plus clear coat type each layer being cured, at least partially, separately
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • 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
    • B05D2202/00—Metallic substrate
    • B05D2202/20—Metallic substrate based on light metals
    • B05D2202/25—Metallic substrate based on light metals based on Al
    • 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
    • B05D2451/00—Type of carrier, type of coating (Multilayers)
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating
    • 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
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/067—Metallic effect
    • B05D5/068—Metallic effect achieved by multilayers

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Description

1 CORROSION PROTECTION METHODS The invention relates to a method of
Improving the corrosion resistance of aluminium or aluminium alloys and particularly concerns motor vehicle wheel rims coated in accordance with this method.
Metallic materials are exposed during use to environmental influences which give rise to a measurable change in the material and can lead to corrosion damage. In terms of corrosion damage it is possible to differentiate between uniform and non-uniform surface wear, pitting. selective corrosion and corrosion cracks. Of these the locally occurring corrosion processes are classified as particularly critical.
Wheel rims made of aluminium or aluminium alloys such as are used for motor vehicles are frequently subject to local corrosion phenomena as a result of stone impact or at highly stressed edges of the production part.
DE-A-33 37 394 has described, for example, a stone impact protective lacquer which contains conventional pigments and fillers. Stone impact protective lacquers have also been disclosed, for example, in EP-A-0059 962 and EP-A-0197349.
However, protective coatings of this kind possess a series of disadvantages. Thus, for example, they can produce only an inadequate coating thickness at the edges, which are subject to particular stress, or during the course of time the coatings become discoloured, impairing the decorative appearance of the coated objects.
For these reasons the need has existed for a method of improving the corrosion resistance of aluminium or aluminium alloys, in particular in motor vehicle wheel rims composed of these materials.
In accordance with the invention this aim is fulfilled by a method wherein the metal surface is firstly coated with a thermally drying lacquer system which is subsequently provided with a VY-protective lacquer coating.
2 Thus the present invention provides a method of improving the corrosion resistance of aluminium or aluminium alloys by applying a two-layer lacquer coating, in which the metal surface is firstly coated with a thermally drying lacquer system which is subsequently provided with a Wprotective lacquer coating.
A further aspect of the invention consists of motor vehicle wheel rims made of aluminium or aluminium alloys and coated in accordance with this method.
Thermally drying base coat lacquers which can be used in accordance with the invention and which serve simultaneously as bonding agents to the metal surface consist, for example, of oil- or alkyd resins. A closed film is formed by diluting the solvents or by absorbing oxygen.
The lacquer can be applied, for example, by brushing on, roller application. compressed air- and high pressure spraying, airless processes, dip-coating (electrophoresis) and electrostatic spray painting.
It is also possible to use physically drying, heat-hardenable reaction resins of the type comprising stoving lacquers based on phenol-, phenol ether- and epoxy resin, nonsaponifiable chlorinated rubber- and Pergut thick film lacquers, polychloroprene cross-linked with isocyanate, and epoxy, urethaneand unsaturated polyester resins.
In a preferred method of forming the thermally drying top coat, the latter is applied to the metal base by powder coating, for example by means of powder sintering, whirl sintering, flame spraying or electrostatic powder spraying.
When the base coat has been applied to the metal surface which may have been pre-treated (e.g. by polishing) and when the drying has been carried out in the manner described in the aforegoing, a top coat comprising a Wprotective lacquer is applied.
The lacquer systems already referred to in the aforegoing are suitable for use in the method corresponding to the invention; lacquers based on acrylenitille resin are particularly suitable.
1 1i 3 Benzophenone derivates, benztriazole derivates, tetra-alkyl-piperidines, benzalmalonitrile esters, oxalic acid diamides or phenyl salicylates can be used for example as UY-protective stabilisers.
The light protection means are generally contained in the systems to be hardened in quantities of 0.1 to 20% by weight, preferably 0.5 to 10%.
The W-protective top-coat lacquers can be stabilised by the addition of known thermal inhibitors and anti-oxidants, such as for example hydroquinone or hydroquinone derivates, pyrogallol, thiophenols, nitrocompounds, 0-naphthyl amines or 0-naphtholes in the usual quantities without thereby impairing the hardening properties of the systems. Additions of this kind are to serve in particular to counter premature polymerisation during the production of the systems by mixing of the components.
Depending upon the purpose of use it is possible to add solvents (e.g. water for water-dilutable systems), dyes, pigments, fillers such as talc, gypsum or silicic acid, fibres, organic additives such as thixotropic agents, flow-control agents, bonding agents, lubricants, flatting agents, softeners, silicones to improve the surface properties, anti-float-off agents or adhesive agents.
By way of reaction accelerators it is possible to use, for example, organic amines, phosphines, alcohols and/or thiols, all of which contain at least one CH-group in the a-position to the hetero-atom. For example primary, secondary and tertiary aliphatic, aromatic, arylphatic or heterocyclic amines, such as described for example in US-A 3 759 807 are suitable. Examples of such amines are butylamine, dibutylamine, tributylamine, cyclohexylamine, benzyldimethylamine, di-cyclohexylamine, triethanolamine, N-methyldiethanolamine, phenyl-diethanolamine, piperidine, piperazine, morpholine, pyridine, quinoline or pdimethylaminobenzoic acid ethylester. Particularly suitable are tertiary amines such as for example trimethylamine, tziisopropylamine, tributylamine, octyldim,h-ylamine, dodecyldimethylamine, triethenolamine, N-methyl-die.thanolamine, N-butyl-diethanolamine, tris-/hydroxypropyl amine, di.methylaminobenzoic acid alkyesters.
4 For use in the method corresponding to the invention the lacquer systems containing UV-stabilisers are applied to the metal surface which has been provided with the primer coat, for example by spray painting, dip coating, casting. pressing-on, blade coating, printing or combinations of these processes. The coating is then hardened in the previously described fashion.
In accordance with the invention the two lacquer coatings are applied to the metal surfaces in such a quantity that expedient dry coating thicknesses of in each case 15 to 100 jum and preferably 40 to 75 jum are achieved.
The coatings produced by the method corresponding to the invention are characterised by improved surface lustre, absence of discolouration, high stone impact strength and the absence of edge corrosion. Example:
Commercially available, untreated passenger vehicle wheel rims made of an aluminium alloy are powder-coated using a polyester lacquer in a coating thickness of 80 jum and are hardened at 2400 within 10 minutes.
Then a W-protective lacquer based on acrylonitrile melamine is sprayed on in a coating thickness of 25 jum and dried at 2000 for 20 minutes.
The coating thus obtained possesses a high lustre and even after 72 hours exposure to light using a high-speed light exposure device (Suntest Original Hanau W; xenon high-pressure radiator 1.1 W, 25 cm light exposure distance) is not inclined to discolouration.
In the Cass corrosion test wheel rims coated simply with a conventional, thermally drying lacquer display the first signs of corrosion after only 3 - 5 hours, whereas the wheel rims protected by the method corresponding to the invention remain free of any signs of corrosion even after 100 hours.

Claims (8)

1. A method for improving the corrosion resistance of aluminium or aluminium alloys by applying a two-layer lacquer coating, wherein the metal surface is firstly coated with a thermally drying lacquer system which is subsequently provided with a UV-protective lacquer coating.
2. A method as claimed in Claim 1, wherein a system based on acrylonitrile is used as UV-protective lacquer system.
3. A method as claimed in one of the Claims 1 and 2, wherein the metal surface is firstly provided with a powder stoving lacquer.
4. A method as claimed in Claim 3, wherein the powder stoving lacquer has a polyester base.
5. A method as claimed in one of the Claims 1 to 4 for improving the corrosion resistance of wheel rims made of aluminium or aluminium alloys for motor vehicles.
6. Wheel rims made of aluminium or aluminium alloys for motor vehicles, characterised by a two-layer surface lacquer coating comprising a thermally dried primer coat and a U-protective top coat.
7. Wheel rims as claimed in Claim 6, wherein the UV-protective top coat consists of an acrylonitrile-based lacquer.
8. The use of M-protective lacquer systems to improve the Corrosion resistance of wheel rims made of aluminium or aluminium alloys for motor vehicles, wherein a UV-hardened top coat is applied to the wheel rims provided with a thermally hardened lacquer system.
lg"at'nie Patent Office.State House, 66.171 High Holborn. London WC1R4TPFurther copies maybe obtained from The Patent Office.
GB8924803A 1988-11-07 1989-11-03 Corrosion protection methods Withdrawn GB2225737A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19883837769 DE3837769A1 (en) 1988-11-07 1988-11-07 CORROSION PROTECTION PROCEDURE

Publications (2)

Publication Number Publication Date
GB8924803D0 GB8924803D0 (en) 1989-12-20
GB2225737A true GB2225737A (en) 1990-06-13

Family

ID=6366668

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8924803A Withdrawn GB2225737A (en) 1988-11-07 1989-11-03 Corrosion protection methods

Country Status (4)

Country Link
JP (1) JPH02227173A (en)
DE (1) DE3837769A1 (en)
FR (1) FR2638765A1 (en)
GB (1) GB2225737A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2317352A (en) * 1996-09-24 1998-03-25 Topy Ind Coating structure on an aluminium wheel
US6413588B1 (en) 1999-01-11 2002-07-02 E. I. Du Pont De Nemours And Company Method of producing durable layered coatings
ITBS20100147A1 (en) * 2010-08-31 2012-03-01 Lucchini Rs Spa PROTECTIVE COATING FOR SALT FITTED RAILWAYS AND APPLICATION METHOD
CN103103528A (en) * 2012-11-13 2013-05-15 铜陵祥云消防科技有限责任公司 Metal antirust agent containing modified medical stone powder
US10190204B2 (en) 2011-09-19 2019-01-29 Basf Se Method for coating light alloy rims

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4036586C2 (en) * 1990-11-16 1994-05-19 Bayerische Motoren Werke Ag Process for treating aluminum sheet used in the construction of vehicles
DE4124670C2 (en) * 1991-07-25 1998-07-09 Cipo Industrieprodukt Gmbh Process for making a paint
EP2570197A1 (en) * 2011-09-19 2013-03-20 Basf Se Method for coating alloy wheel rims
CN103343346B (en) * 2013-07-10 2015-09-23 江苏东方龙机车集团有限公司 A kind of technique improving aluminum or aluminum alloy surface anticorrosion performance
IT202000005629A1 (en) * 2020-03-17 2021-09-17 La Bottega S R L "METHOD OF PRODUCTION OF AN OBJECT COVERED WITH A PAINTED LAYER"

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981000233A1 (en) * 1979-07-26 1981-02-05 Du Pont Clear coat/color coat finish containing an ultraviolet light stabilizer
EP0029597A1 (en) * 1979-11-21 1981-06-03 E.I. Du Pont De Nemours And Company An aqueous thermosetting acrylic coating composition, articles coated therewith, and process for preparing said coated articles
GB2079299A (en) * 1980-05-30 1982-01-20 Gen Electric Ultraviolet light absorbing agents and compositions and articles containing same
EP0080840A1 (en) * 1981-11-20 1983-06-08 Glasurit America, Inc. A process for the production of a multilayer protective and/or decorative coating upon a surface of a substrate
EP0148718A2 (en) * 1983-11-28 1985-07-17 BASF Corporation Color tinted clear coat coating system
US4719132A (en) * 1984-09-21 1988-01-12 Ppg Industries, Inc. Process for the preparation of multi-layered coatings and coated articles derived therefrom

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981000233A1 (en) * 1979-07-26 1981-02-05 Du Pont Clear coat/color coat finish containing an ultraviolet light stabilizer
EP0029597A1 (en) * 1979-11-21 1981-06-03 E.I. Du Pont De Nemours And Company An aqueous thermosetting acrylic coating composition, articles coated therewith, and process for preparing said coated articles
GB2079299A (en) * 1980-05-30 1982-01-20 Gen Electric Ultraviolet light absorbing agents and compositions and articles containing same
EP0080840A1 (en) * 1981-11-20 1983-06-08 Glasurit America, Inc. A process for the production of a multilayer protective and/or decorative coating upon a surface of a substrate
EP0148718A2 (en) * 1983-11-28 1985-07-17 BASF Corporation Color tinted clear coat coating system
US4719132A (en) * 1984-09-21 1988-01-12 Ppg Industries, Inc. Process for the preparation of multi-layered coatings and coated articles derived therefrom

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2317352A (en) * 1996-09-24 1998-03-25 Topy Ind Coating structure on an aluminium wheel
GB2317352B (en) * 1996-09-24 2000-07-26 Topy Ind Coating structure formed on an aluminum wheel and a forming method therefor
US6413588B1 (en) 1999-01-11 2002-07-02 E. I. Du Pont De Nemours And Company Method of producing durable layered coatings
ITBS20100147A1 (en) * 2010-08-31 2012-03-01 Lucchini Rs Spa PROTECTIVE COATING FOR SALT FITTED RAILWAYS AND APPLICATION METHOD
WO2012029085A1 (en) 2010-08-31 2012-03-08 Lucchini Rs S.P.A. Protective covering for railway wheel sets and method of application
US10190204B2 (en) 2011-09-19 2019-01-29 Basf Se Method for coating light alloy rims
CN103103528A (en) * 2012-11-13 2013-05-15 铜陵祥云消防科技有限责任公司 Metal antirust agent containing modified medical stone powder
CN103103528B (en) * 2012-11-13 2015-11-18 铜陵祥云消防科技有限责任公司 A kind of metal antirusting agent containing modification medical stone powder

Also Published As

Publication number Publication date
GB8924803D0 (en) 1989-12-20
DE3837769A1 (en) 1990-05-17
FR2638765A1 (en) 1990-05-11
JPH02227173A (en) 1990-09-10

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