DE10342426A1 - Production of a microporous layer of magnesium alloys used in vehicle manufacture comprises inserting one ore more inhibitors into the microporous layer for corrosion protection during and after anodization - Google Patents
Production of a microporous layer of magnesium alloys used in vehicle manufacture comprises inserting one ore more inhibitors into the microporous layer for corrosion protection during and after anodization Download PDFInfo
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- DE10342426A1 DE10342426A1 DE2003142426 DE10342426A DE10342426A1 DE 10342426 A1 DE10342426 A1 DE 10342426A1 DE 2003142426 DE2003142426 DE 2003142426 DE 10342426 A DE10342426 A DE 10342426A DE 10342426 A1 DE10342426 A1 DE 10342426A1
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- microporous layer
- inhibitors
- corrosion protection
- microporous
- anodization
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- 230000007797 corrosion Effects 0.000 title claims abstract description 25
- 238000005260 corrosion Methods 0.000 title claims abstract description 25
- 239000003112 inhibitor Substances 0.000 title claims abstract description 19
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 13
- 238000002048 anodisation reaction Methods 0.000 title claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 title abstract description 4
- 238000000034 method Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- 150000007513 acids Chemical class 0.000 claims description 2
- 150000001450 anions Chemical class 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 claims description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 2
- 229910052785 arsenic Inorganic materials 0.000 claims description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 2
- 150000001642 boronic acid derivatives Chemical class 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 2
- 239000000194 fatty acid Substances 0.000 claims description 2
- 229930195729 fatty acid Natural products 0.000 claims description 2
- 150000004665 fatty acids Chemical class 0.000 claims description 2
- 229910052738 indium Inorganic materials 0.000 claims description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 239000011572 manganese Substances 0.000 claims description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 2
- -1 mercapto compounds Chemical class 0.000 claims description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 2
- 229910052753 mercury Inorganic materials 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 150000002825 nitriles Chemical group 0.000 claims description 2
- 229910017464 nitrogen compound Inorganic materials 0.000 claims description 2
- 150000002830 nitrogen compounds Chemical group 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 230000000737 periodic effect Effects 0.000 claims description 2
- 235000021317 phosphate Nutrition 0.000 claims description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims description 2
- 150000003222 pyridines Chemical group 0.000 claims description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 150000003557 thiazoles Chemical class 0.000 claims description 2
- 150000003556 thioamides Chemical class 0.000 claims description 2
- 150000003568 thioethers Chemical class 0.000 claims description 2
- 125000003396 thiol group Chemical class [H]S* 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 150000003672 ureas Chemical class 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 150000004673 fluoride salts Chemical class 0.000 claims 1
- 125000005842 heteroatom Chemical group 0.000 claims 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 12
- 239000011777 magnesium Substances 0.000 description 11
- 229910052749 magnesium Inorganic materials 0.000 description 10
- 239000011148 porous material Substances 0.000 description 8
- 238000007743 anodising Methods 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013000 chemical inhibitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000007530 organic bases Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/30—Anodisation of magnesium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
Die Erfindung betrifft den Korrosionsschutz von Magnesium-Legierungen mittels Inhibitoren im Anodisationsverfahren, insbesondere im Rahmen der anodischen Oxidation. Magnesium-Legierungen spielen insbesondere im Fahrzeugbau eine besondere Rolle und deren Korrosionsschutz ist von besonderem Interesse. Im Rahmen dieser Erfindung sind Legierungen Zusammensetzungen aus mindestens zwei Metallen: AxBy, welche geeignet sind als Werkstoffe bzw. Verbundwerkstoffe, vorzugsweise im Fahrzeugbau, eingesetzt zu werden. Magnesium weist insbesondere eine hohe spezifische Festigkeit auf (hohe Dauerfestigkeit) sowie eine vorteilhafte gute Gießbarkeit mit Eignung zum Druckguß. Nachteilig ist jedoch die niedrige Korrosionsbeständigkeit, die aufgrund des unedlen Charakters von Magnesium/Magnesium2+ – der elektromotorischen Kraft – besteht. Diese wird noch erheblich verstärkt durch Spuren (Verunreinigungen) edlerer Elemente, insbesondere Eisen, Kupfer und Nickel, in der Magnesium-Legierung, die zur Ausbildung von Lokalelementen führen. Aus diesem Grund sind die Gehalte an den genannten Elementen bei den heute eingesetzten High Purity (HP) Legierungen streng begrenzt.The invention relates to the corrosion protection of magnesium alloys by means of inhibitors in the anodization process, in particular in the context of anodic oxidation. Magnesium alloys play a special role especially in vehicle construction and their corrosion protection is of particular interest. In the context of this invention, alloys are compositions of at least two metals: A x B y , which are suitable to be used as materials or composite materials, preferably in vehicle construction. In particular, magnesium has a high specific strength (high fatigue strength) and an advantageous good castability suitable for diecasting. A disadvantage, however, is the low corrosion resistance, which is due to the base character of magnesium / magnesium 2+ - the electromotive force. This is considerably enhanced by traces (impurities) of nobler elements, in particular iron, copper and nickel, in the magnesium alloy, which lead to the formation of local elements. For this reason, the contents of these elements are strictly limited in the high purity (HP) alloys used today.
Magnesium bildet an der Luft und in reinem oder alkalischem Wasser passivierende kristalline Filme auf der Oberfläche, bestehend aus MgO/Mg(OH)2 oder basischem Magnesiumcarbonat aus. In alkalischen wäßrigen Lösungen ohne Säurebildner wie z.B. Chloride mit einem pH-Wert > 10,5 ist die Passivschicht sehr stabil, jedoch nicht bei einem pH-Wert < 10,5.Magnesium forms in the air and in pure or alkaline water passivating crystalline films on the surface consisting of MgO / Mg (OH) 2 or basic magnesium carbonate. In alkaline aqueous solutions without acid generators such as chlorides with a pH of> 10.5, the passive layer is very stable, but not at a pH of <10.5.
Aufgrund einer geometrische Fehlanpassung der Passivschicht an das Magnesium-Gitter können große Eigenspannungen vorliegen und dadurch Risse entstehen bzw. die Passivschicht abplatzen. Die Folge ist ein Freilegen blanker Metalloberfläche und dadurch bedingt erhöhte Korrosionsanfälligkeit von Magnesium an diesen Stellen.by virtue of a geometric mismatch of the passive layer to the magnesium lattice can cause large residual stresses and thereby cracks or flake off the passive layer. The consequence is an exposure of bare metal surface and thus increased corrosion susceptibility of magnesium in these places.
Ungeschütztes Magnesium ist daher durch Umwelteinflüsse wie Abgase, saurer Regen, Streusalze u.a. immer einer mehr oder weniger starken Korrosion ausgesetzt. In alkalischen Medien bildet sich wieder die Passivschicht aus.Unprotected magnesium is therefore due to environmental influences such as exhaust gases, acid rain, road salt and others. always one more or exposed to less severe corrosion. In alkaline media forms again the passive layer.
Für einen erhöhten Korrosionsschutz lassen sich Passivschichten gezielt in wässrigen Lösungen erzeugen. Bekannt sind z.B. Chromatfilme. Diese bilden eine gute Haftgrundlage für organische Überzüge, sind jedoch toxisch nicht unbedenklich.For one increased Corrosion protection can be targeted to passive layers in aqueous Create solutions. It is known e.g. Chromate. These form a good basis for adhesion for organic coatings, are but not toxic.
Eine
breite Anwendung zum Korrosionsschutz nimmt das Anodisieren von
Magnesium-Werkstoffen ein, insbesondere im Rahmen der anodischen
Oxidation (in Analogie zum Eloxal-Verfahren). Bekannt sind hier
Verfahren wie HAE oder Dow 17 (H. Simon, M. Thoma „Angewandte
Oberflächentechnik
für metallische
Werkstoffe", Carl
Hanser verlag, München
Wien 1985, 5. 91 ff.) oder neuere Verfahren unter Funkenbildung
wie z.B. Magoxid, Tagnite oder PEO. Durch eine solche Reaktion im
Elektrolyten wird die Oberfläche
des Magnesiums in Magnesiumoxid umgewandelt, sogenannte Bildung
einer keramikartigen Oberfläche
(Siehe
Alle diese Anodisierverfahren liefern jedoch porenhaltige Oxidschichten (kurz: mikroporöse Schicht(en)). Größe und Anzahl der Poren sind dabei vom Verfahren und den Verfahrensparametern abhängig. Ebenfalls in den mikroporösen Schichten kann sich der Porengehalt und die Porengröße über die Schichtdicke ändern, wobei sich üblicherweise nahe dem Metall porenarme kompakte Schichten und an der Oberfläche porenreichere Schichten aufbauen.All however, these anodization methods yield porous oxide layers (in short: microporous layer (s)). Size and number the pores are of the process and the process parameters dependent. Also in the microporous Layers can increase the pore content and the pore size over the Change layer thickness, usually close the pore-poor compact layers and the pore-rich on the surface Build up layers.
Während sich
diese Poren bei Aluminium durch den Prozess des Verdichtens schließen lassen,
ist dies bei Magnesium jedoch nicht möglich. Um hier den Korrosionsschutz
der mikroporösen
Schichten zu verbessern, müssen
diese Poren daher verschlossen werden. Das geschieht im Stand der
Technik durch sogenannte Versiegelungen, die entweder auf anorganischer
Basis (z.B. Wasserglas) oder organischer Basis (z.B. Epoxidharze)
beruhen. Die porige Oberfläche
wird daneben auch als Haftgrund für organische Beschichtungen
(Lacke) verwendet oder dient zur Einlagerung von tribologisch wirksamen, d.h.
reibungsmindernden Trockenschmierstoffen wie MoS2 bzw.
PTFE (siehe z.B.
Auch
der Einsatz von Kieselsolen ist beschrieben worden (
Im Stand der Technik ist jedoch der Einsatz von Inhibitoren zwecks Korrosionsschutz von Magnesium-Legierungen im Rahmen eines Ansodisierverfahrens nicht beschrieben.in the However, prior art is the use of inhibitors in order Corrosion protection of magnesium alloys as part of an anodising process not described.
Daher ist es Aufgabe dieser Erfindung die mikroporösen Schicht(en) im Rahmen eines Ansodisierverfahrens auf Magnesium-Legierungen bzw. daraus gebildete Werkstoffe und Werkgegenstände mittels Inhibitoren in ihrem Korrosionsschutz zu verbessern.Therefore It is an object of this invention, the microporous layer (s) in the context of a Ansodisierverfahrens on magnesium alloys or formed therefrom Materials and workpieces by means of To improve inhibitors in their corrosion protection.
Daher betrifft diese Erfindung ein Verfahren zum Herstellen einer mikroporösen Schicht auf Magnesium-Legierungen mittels Anodisierverfahren, dadurch gekennzeichnet, dass während oder nach dem Anodisierverfahren ein oder mehrere Inhibitoren in die mikroporöse Schicht zwecks Korrosionsschutz eingebracht werden.Therefore, this invention relates to a method for producing a microporous layer on magnesium alloys by means of anodizing process, characterized in that during or after the anodizing process one or more inhibitors are introduced into the microporous layer for the purpose of corrosion protection.
Erfindungsgemäß sollen diese Inhibitoren die Korrosionsbeständigkeit der erhaltenen mikroporösen (oxidischen Oberflächenschutz-)Schichten auf Magnesium-Legierungen verbessern und zusätzlich bei einer Verletzung des Oberflächenschutzes die Korrosionsgeschwindigkeit herabsetzen.According to the invention these inhibitors reduce the corrosion resistance of the resulting microporous (oxidic Surface protection) layers to improve on magnesium alloys and additionally in case of injury of surface protection reduce the corrosion rate.
Diese Inhibitoren können erfindungsgemäß beim Anodisieren von Magnesium-Legierungen, daraus erhaltene Werkstoffen oder Werksgegenständen schon im Bad zugesetzt werden (z.B. bei der elektrolytischen anodischen Oxidation), oder aber auch nach erfolgtem Anodisieren nachträglich in die Poren eingebracht werden.These Inhibitors can according to the invention during anodization of magnesium alloys, resulting materials or works already be added in the bath (e.g., in the electrolytic anodic Oxidation), or even after successful anodization in the pores are introduced.
Eine nachträgliche Versiegelung mit anorganischen bzw. organischen Substanzen kann zudem die Beständigkeit der erzeugten inhibierten Oberflächen weiter verbessern.A subsequent Seal with inorganic or organic substances can also the resistance the generated inhibited surfaces improve further.
Alle Korrosionsarten an Magnesium-Werkstoffen lassen sich auf elektrochemische Vorgänge zurückführen. Hier greifen die erfindungsgemäßen Inhibitoren als Korrosionsschutz an. Sie wirken entweder durch Adsorption an kathodischen bzw. anodischen Stellen der Oberfläche (physikalische Inhibitoren) bzw. greifen in den Korrosionsmechanismus ein (chemische Inhibitoren), indem sie mit dem Metall eine chemische Bindung eingehen bzw. mit den Bestandteilen des Korrosionsmediums reagieren.All Types of corrosion on magnesium materials can be based on electrochemical Attributing operations. Here take the inhibitors of the invention as corrosion protection. They act either by adsorption cathodic or anodic sites of the surface (physical inhibitors) or intervene in the corrosion mechanism (chemical inhibitors), by making a chemical bond with the metal or with react with the constituents of the corrosion medium.
Inhibitoren,
die für
den erfindungsgemäßen Einsatz
zum Einlagern in die mikroporöse
Schicht ausgewählt
sind, sind:
Passivatoren als oxidierende Anionen und/oder Deckschichtbildner,
wie schwerlösliche
Korrosionsprodukte und zwar: Phosphate, Borate, Fluoride, Hetero-
und Polysäuren
der Elemente der 4., 5. und 6. Nebengruppe des Periodensystems (Ti,
Zr, V, Nb, Mo, W, Mn) niedermolekulare Säuren, Fettsäuren mit C12-C26.
und/oder
Elektrochemische
Inhibitoren bzw. Destimulatoren wie schwefelhaltige Verbindungen:
z.B. Thiole, Thioamide, Thiazole, Mercapto-Verbindungen, Sulfide, Sulfite
und/oder stickstoffhaltige Verbindungen, wie Harnstoffderivate,
quartäre
Stickstoffverbindungen, Nitrile, Pyridine
und/oder
Metalle
und deren Salze, wie Zinn, Mangan, Indium, Antimon, Arsen, QuecksilberInhibitors selected for use according to the invention for incorporation into the microporous layer are:
Passivators as oxidizing anions and / or covering layer formers, such as sparingly soluble corrosion products and namely: phosphates, borates, fluorides, hetero- and polyacids of the elements of the 4th, 5th and 6th subgroup of the periodic table (Ti, Zr, V, Nb, Mo, W, Mn) low molecular weight acids, fatty acids with C12-C26.
and or
Electrochemical inhibitors or destimulators such as sulfur-containing compounds: for example, thiols, thioamides, thiazoles, mercapto compounds, sulfides, sulfites and / or nitrogen-containing compounds, such as urea derivatives, quaternary nitrogen compounds, nitriles, pyridines
and or
Metals and their salts, such as tin, manganese, indium, antimony, arsenic, mercury
Das Einbringen der Inhibitoren kann für den Fachmann in bekannter Weise erfolgen. Neben Auftrockenen und Vakuumtechniken, sind alle Techniken geeignet, die Inhibitoren, beispielsweise aus wässriger/alkoholischer Lösung, in und an den Poren der mikroporösen Schicht verbleiben lassen.The Introduction of the inhibitors can be known to the person skilled in the art Done way. In addition to drying and vacuum techniques, are all Suitable techniques, the inhibitors, for example, from aqueous / alcoholic Solution, in and on the pores of the microporous Leave the layer.
Im
Rahmen diese Erfindung sind nicht abschließend folgende Magnesium-Legierungen
des Fahrzeugsbaues besonders geeignet: Vollprofile:
AZ31 B-F,
AZ61 A-F, AZ80 A-T5, H310 A-T5, ZK60 A-T5
Hohlprofile und Rohre:
AZ31
B-F, AZ61 A-F, ZK60 A-T5
Bleche und Bänder: AZ31 B-H24, AZ31 B-O,
HK31 A-H24, HK31 A-O, HM21 A-T8For the purposes of this invention, the following magnesium alloys of vehicle construction are not particularly suitable: full profiles:
AZ31 BF, AZ61 AF, AZ80 A-T5, H310 A-T5, ZK60 A-T5
Hollow sections and tubes:
AZ31 BF, AZ61 AF, ZK60 A-T5
Sheets and strips: AZ31 B-H24, AZ31 BO, HK31 A-H24, HK31 AO, HM21 A-T8
Der Begriff Magnesium-Legierungen umfasst im Rahmen dieser Erfindung ebenfalls Magnesium-haltige Legierungen oder das Magnesiummetall als solches.Of the Term magnesium alloys includes within the scope of this invention also magnesium-containing alloys or the magnesium metal as such.
Des weiteren betrifft die Erfindung die Verwendung einer erfindungsgemäßen mikroporösen Schicht, enthaltend Inhibitoren zwecks Korrosionsschutz als Schicht zum Oberflächenschutz. Ferner deren Werkstoffe als auch Werkgegenstände, insbesondere im Fahrzeugbau. Werkgegenstände sind z.B. solche vorzugsweise aus Druckguss erhalten, wie Fahrzeugteile, insbesondere Türmodule, Zylinderkopfabdeckungen, Getriebe und Differentialgehäuse oder Lenkradkern.Of Furthermore, the invention relates to the use of a microporous layer according to the invention, containing inhibitors for corrosion protection as a surface protection layer. Furthermore, their materials as well as works, especially in vehicle. Business objects are e.g. preferably obtained from die-cast, such as vehicle parts, especially door modules, Cylinder head covers, gearboxes and differential cases or Steering wheel core.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2003142426 DE10342426A1 (en) | 2003-09-13 | 2003-09-13 | Production of a microporous layer of magnesium alloys used in vehicle manufacture comprises inserting one ore more inhibitors into the microporous layer for corrosion protection during and after anodization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2003142426 DE10342426A1 (en) | 2003-09-13 | 2003-09-13 | Production of a microporous layer of magnesium alloys used in vehicle manufacture comprises inserting one ore more inhibitors into the microporous layer for corrosion protection during and after anodization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE10342426A1 true DE10342426A1 (en) | 2005-04-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2003142426 Withdrawn DE10342426A1 (en) | 2003-09-13 | 2003-09-13 | Production of a microporous layer of magnesium alloys used in vehicle manufacture comprises inserting one ore more inhibitors into the microporous layer for corrosion protection during and after anodization |
Country Status (1)
| Country | Link |
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| DE (1) | DE10342426A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3808610A1 (en) * | 1988-03-15 | 1989-09-28 | Electro Chem Eng Gmbh | PROCESS FOR SURFACE FINISHING OF MAGNESIUM AND MAGNESIUM ALLOYS |
| EP0792392B1 (en) * | 1994-11-14 | 1999-04-21 | The Secretary Of State For Defence | Treatment of aluminium or aluminium alloys |
| DE4124730C3 (en) * | 1991-07-25 | 2001-09-06 | Ahc Oberflaechentechnik Gmbh | Anodized objects made of aluminum or magnesium with fluoropolymers embedded in the oxide layer and process for their production |
| DE10127770A1 (en) * | 2001-06-07 | 2002-12-12 | Volkswagen Ag | Production of anticorrosion coating on magnesium or alloy part, used in vehicle or aircraft construction, involves oxidation in aluminum phosphate electrolyte containing vanadium, molybdenum and/or manganese compound |
| WO2003029529A1 (en) * | 2001-10-02 | 2003-04-10 | Henkel Kommanditgesellschaft Auf Aktien | Light metal anodization |
| FR2835851A1 (en) * | 2002-02-13 | 2003-08-15 | Univ Paris Curie | COMPOSITION FOR THE TREATMENT OF MAGNESIUM ALLOYS |
-
2003
- 2003-09-13 DE DE2003142426 patent/DE10342426A1/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3808610A1 (en) * | 1988-03-15 | 1989-09-28 | Electro Chem Eng Gmbh | PROCESS FOR SURFACE FINISHING OF MAGNESIUM AND MAGNESIUM ALLOYS |
| DE4124730C3 (en) * | 1991-07-25 | 2001-09-06 | Ahc Oberflaechentechnik Gmbh | Anodized objects made of aluminum or magnesium with fluoropolymers embedded in the oxide layer and process for their production |
| EP0792392B1 (en) * | 1994-11-14 | 1999-04-21 | The Secretary Of State For Defence | Treatment of aluminium or aluminium alloys |
| DE10127770A1 (en) * | 2001-06-07 | 2002-12-12 | Volkswagen Ag | Production of anticorrosion coating on magnesium or alloy part, used in vehicle or aircraft construction, involves oxidation in aluminum phosphate electrolyte containing vanadium, molybdenum and/or manganese compound |
| WO2003029529A1 (en) * | 2001-10-02 | 2003-04-10 | Henkel Kommanditgesellschaft Auf Aktien | Light metal anodization |
| FR2835851A1 (en) * | 2002-02-13 | 2003-08-15 | Univ Paris Curie | COMPOSITION FOR THE TREATMENT OF MAGNESIUM ALLOYS |
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