EP0126498A1 - Procédé pour la protection des métaux contre la corrosion - Google Patents

Procédé pour la protection des métaux contre la corrosion Download PDF

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Publication number
EP0126498A1
EP0126498A1 EP84200397A EP84200397A EP0126498A1 EP 0126498 A1 EP0126498 A1 EP 0126498A1 EP 84200397 A EP84200397 A EP 84200397A EP 84200397 A EP84200397 A EP 84200397A EP 0126498 A1 EP0126498 A1 EP 0126498A1
Authority
EP
European Patent Office
Prior art keywords
synthetic resin
cationic
phosphate layer
corrosion protection
phosphate
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.)
Granted
Application number
EP84200397A
Other languages
German (de)
English (en)
Other versions
EP0126498B1 (fr
Inventor
Peter Jörns
Werner Dr. Rausch
Gisela Rossmann
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.)
GEA Group AG
Continentale Parker Ste
Continentale Parker SA
Original Assignee
Metallgesellschaft AG
Continentale Parker Ste
Continentale Parker SA
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 Metallgesellschaft AG, Continentale Parker Ste, Continentale Parker SA filed Critical Metallgesellschaft AG
Publication of EP0126498A1 publication Critical patent/EP0126498A1/fr
Application granted granted Critical
Publication of EP0126498B1 publication Critical patent/EP0126498B1/fr
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B05D7/14—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 to metal, e.g. car bodies
    • B05D7/16—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 to metal, e.g. car bodies using synthetic lacquers or varnishes
    • 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
    • C23C22/82—After-treatment
    • C23C22/83—Chemical after-treatment

Definitions

  • the invention relates to a method for corrosion protection of metals, in particular iron and steel, by applying a phosphate layer and impregnating the phosphate layer with organic synthetic resin.
  • the pH of the solution used is usually in the alkaline range, which is the case when treating metal surfaces provided with conversion coatings may be associated with the disadvantage of partial delamination.
  • the object of the invention is to provide a method which does not have the disadvantages of the known methods and which provides surfaces with excellent corrosion protection and high abrasion resistance.
  • the object is achieved by designing the method of the type mentioned at the outset in accordance with the invention in such a way that a phosphate layer with a basis weight of at least 8 g / m 2 is first produced on the metal surface and at least electrolessly by means of an aqueous solution or dispersion of a cationic synthetic resin 8 g / m 2 synthetic resin applied and baked.
  • An advantageous development of the method according to the invention provides for a maximum of 40 g / m 2 of synthetic resin to be applied. Higher application weights practically no longer provide additional corrosion protection.
  • phosphate is the only anion in the acidic, aqueous phosphating solution.
  • anions such as nitrate, nitrite, chloride, sulfate, chlorate, fluoride, complex fluoride, citrate, are present zidtician to accelerate the layer formation and to establish the required A in the bathrooms often.
  • the phosphating baths are particularly suitable for the process according to the invention, in which at least a considerable proportion of the iron pickled during the layer formation remains in solution as divalent iron.
  • the concentration of the phosphating baths is preferably chosen between 20 and 120 points.
  • the application temperature is usually in the range of 40 to 98 ° C.
  • the immersion process is preferred for layer formation because it allows the layer weight limit required in the invention to be maintained in a simpler manner than the spray process.
  • the phosphating times are usually 4 to 30 minutes.
  • the cationic synthetic resins used in the impregnation process according to the invention can be partially or fully neutralized with organic acids or phosphoric acid in the aqueous medium as an emulsion, dispersion and / or colloidal solution.
  • the solids content is preferably 5 to 25% by weight.
  • the cationic synthetic resins are selected from the group of polycondensation and polymerization resins and are given their cationic function e.g. by basic nitrogen-containing groups which form cations after the addition of acid in an aqueous medium.
  • Cationic acrylate resins can be obtained, for example, by copolymerizing N, N-dimethylaminoethyl methacrylate.
  • Cationic resins can also be prepared by reacting Mannich bases of bisphenol A with epoxy resins. Modified epoxy resins which have been made acid-soluble by addition of an amine and in which crosslinking is made possible by addition of a half-capped diisocyanate during baking are particularly suitable for the process according to the invention.
  • the cationic resin from an aqueous solution or dispersion which additionally most of the lacquer and ink formulation - th additives and modifiers such as dyes, fillers - and K orrosionstikpigmente, soluble corrosion inhibitors, organic solvents and / or additives for an improved film flow as well as to support the cross-linking process when baking.
  • the lacquer and ink formulation - th additives and modifiers such as dyes, fillers - and K orrosionstikpigmente, soluble corrosion inhibitors, organic solvents and / or additives
  • the L are ackformulmaschineen suitable for the novel process, among others, which are for the cathodic electrodeposition of metals using. In the context of the invention, they are successfully used as an aqueous medium containing cationic synthetic resin without the use of electric current.
  • the organic impregnation film is applied by wetting the phosphated surface with the aqueous solution or dispersion containing the cationic synthetic resin.
  • the wetting can be carried out by spraying on, pouring over, immersing and, if appropriate, subsequently spinning off excess liquid.
  • a further advantageous embodiment of the invention provides for the cationic synthetic resin to be applied by wetting it at least twice with brief drying and subsequent baking.
  • the intermediate drying should be performed to such an extent until the film has a sufficient mechanical strength h at reach.
  • the baking which concludes the application of the cationic synthetic resin, is usually carried out at object temperatures between 160 and 200 ° C. and holding times of 5 to 30 minutes.
  • An advantageous further development of the invention is to post-assivierstoffn to further improve the corrosion protection, the phosphate layer prior to the application of the cationic synthetic resin -containing known per se Cr (VI) aqueous P.
  • They can be formulated based on chromic acid, chromium chromate, alkali dichromate and the like.
  • the method according to the invention is particularly suitable for high-quality corrosion protection of mass parts from the functional area.
  • Typical workpieces are screws, nuts, washers, springs, fasteners, brake parts and the like.
  • the protective value of the layers produced by the process according to the invention is usually significantly higher than that of chromated, electrolytically produced zinc and cadmium layers.
  • Degreasing or referred to in the first e ntrostung and descaling according to the third may be omitted if the parts to be treated are free of grease or rust or scale-free.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Paints Or Removers (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
EP84200397A 1983-04-26 1984-03-20 Procédé pour la protection des métaux contre la corrosion Expired EP0126498B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3315019 1983-04-26
DE19833315019 DE3315019A1 (de) 1983-04-26 1983-04-26 Verfahren zum korrosionsschutz von metallen

Publications (2)

Publication Number Publication Date
EP0126498A1 true EP0126498A1 (fr) 1984-11-28
EP0126498B1 EP0126498B1 (fr) 1987-06-16

Family

ID=6197351

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84200397A Expired EP0126498B1 (fr) 1983-04-26 1984-03-20 Procédé pour la protection des métaux contre la corrosion

Country Status (9)

Country Link
EP (1) EP0126498B1 (fr)
JP (1) JPS59205481A (fr)
AU (1) AU2713784A (fr)
BR (1) BR8401870A (fr)
DE (2) DE3315019A1 (fr)
ES (1) ES8506817A1 (fr)
GB (1) GB2138703B (fr)
PT (1) PT78408B (fr)
ZA (1) ZA843025B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0537697A1 (fr) * 1991-10-17 1993-04-21 Herberts Gesellschaft mit beschränkter Haftung Procédé pour fabriquer des revêtements multicouches avec une couche intermédiaire cationique
EP0538719A1 (fr) * 1991-10-17 1993-04-28 Herberts Gesellschaft mit beschränkter Haftung Procédé pour fabriquer des revêtements multicouches

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5693739A (en) * 1995-12-21 1997-12-02 Ppg Industries, Inc. Phenolic polymers from amino phenols and anhydride or epoxy polymers
FR2818572B1 (fr) † 2000-12-22 2003-03-14 Valeo Procede de fabrication d'une bague de synchronisation de boite de vitesses, notamment pour vehicule automobile

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2432593A1 (de) * 1974-07-06 1976-01-22 Nippon Paint Co Ltd Verfahren zum aufbringen von anstrichmitteln und ueberzugsmassen auf leitfaehige werkstoffe
CH595459A5 (en) * 1973-03-19 1978-02-15 Zbrojovka Brno Np Polyphenylene oxide protective coatings for metals
EP0091166A1 (fr) * 1982-04-07 1983-10-12 Metallgesellschaft Ag Procédé pour traiter de surfaces métalliques

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH595459A5 (en) * 1973-03-19 1978-02-15 Zbrojovka Brno Np Polyphenylene oxide protective coatings for metals
DE2432593A1 (de) * 1974-07-06 1976-01-22 Nippon Paint Co Ltd Verfahren zum aufbringen von anstrichmitteln und ueberzugsmassen auf leitfaehige werkstoffe
EP0091166A1 (fr) * 1982-04-07 1983-10-12 Metallgesellschaft Ag Procédé pour traiter de surfaces métalliques

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, Band 93, Nr. 2, 14. Juli 1980, Seite 231, Nr. 11834w, Columbus, Ohio, USA; & JP-A-54 148 139 (NIPPON STEEL CORP.; KOBE STEEL, LTD.) 20.11.1979 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0537697A1 (fr) * 1991-10-17 1993-04-21 Herberts Gesellschaft mit beschränkter Haftung Procédé pour fabriquer des revêtements multicouches avec une couche intermédiaire cationique
EP0538719A1 (fr) * 1991-10-17 1993-04-28 Herberts Gesellschaft mit beschränkter Haftung Procédé pour fabriquer des revêtements multicouches
US5552227A (en) * 1991-10-17 1996-09-03 Herberts Gmbh Process of producing multilayer coatings with cationic layers of primer surface

Also Published As

Publication number Publication date
GB2138703A (en) 1984-10-31
AU2713784A (en) 1984-11-01
EP0126498B1 (fr) 1987-06-16
ES531122A0 (es) 1985-08-01
ZA843025B (en) 1985-06-26
GB2138703B (en) 1986-04-30
DE3315019A1 (de) 1984-10-31
PT78408B (fr) 1986-05-28
DE3464261D1 (en) 1987-07-23
BR8401870A (pt) 1984-11-27
JPS59205481A (ja) 1984-11-21
PT78408A (fr) 1984-05-01
ES8506817A1 (es) 1985-08-01
GB8410725D0 (en) 1984-05-31

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