EP0096753A1 - Process for the electroless production of corrosion-inhibiting layers on structural parts of aluminium - Google Patents
Process for the electroless production of corrosion-inhibiting layers on structural parts of aluminium Download PDFInfo
- Publication number
- EP0096753A1 EP0096753A1 EP83104742A EP83104742A EP0096753A1 EP 0096753 A1 EP0096753 A1 EP 0096753A1 EP 83104742 A EP83104742 A EP 83104742A EP 83104742 A EP83104742 A EP 83104742A EP 0096753 A1 EP0096753 A1 EP 0096753A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- corrosion
- aluminum
- naoh
- aluminium
- production
- 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
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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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
Definitions
- the invention relates to a method for the currentless production of corrosion-protective layers on aluminum components, in particular on hollow body components with a honeycomb structure.
- protective layers of zinc or zinc-containing alloys to aluminum. This can be done, for example, by metal spraying, by galvanizing or by roll cladding. Although the methods lead to good adhesion and mechanical resistance of the protective layer, they are relatively complex.
- Chromating and phosphating processes are also known, with the aid of which top layers can be applied to aluminum.
- solutions made from monozinc phosphate, phosphoric acid and fluoride are used.
- the resulting layers are about 1-5 f ⁇ m thick and soluble in acids and alkalis. They are therefore mainly used as a primer for paints and plastic coatings.
- the layers are protected with a thin, clear methacrylate or cellulose acetate coating, since otherwise there is a risk of corrosion attack (see Wernick, Pinner, Zurbrügg and Weiner "The surface treatment of aluminum", p. 193 ).
- the object of the present invention is to develop a method for producing corrosion-protected components in which the coatings are relatively easy to manufacture, have high wear resistance and corrosion resistance.
- Zincate solutions of this composition are generally known.
- the surface treatment of aluminum p. 501 indicated a similar composition, this zincate solution being used to achieve thin layers of zinc for subsequent galvanization.
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Coating With Molten Metal (AREA)
- Coating By Spraying Or Casting (AREA)
- Building Environments (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur stromlosen Erzeugung von korrosionsschützenden Schichten auf Aluminiumbauteilen, insbesondere auf Hohlkörper-Bauteilen mit Wabenstruktur.The invention relates to a method for the currentless production of corrosion-protective layers on aluminum components, in particular on hollow body components with a honeycomb structure.
Zur Herstellung von korrosionsgeschützten Bauteilen ist es bekannt, Schutzschichten von Zink bzw. zinkhaltigen Legierungen auf Aluminium aufzubringen. Dieses kann beispielsweise durch Metallspritzen, durch Galvanisieren oder durch Walzplattieren geschehen. Die Verfahren führen zwar zu einer guten Haftung und mechanischen Widerstandfähigkeit der Schutzschicht, sind aber verhältnismäßig aufwendig.For the production of corrosion-protected components, it is known to apply protective layers of zinc or zinc-containing alloys to aluminum. This can be done, for example, by metal spraying, by galvanizing or by roll cladding. Although the methods lead to good adhesion and mechanical resistance of the protective layer, they are relatively complex.
Ferner sind Chromatier- und Phosphatierverfahren bekannt, mit deren Hilfe Deckschichten auf Aluminium aufgebracht werden können. Bei einem sauren Phosphatierverfahren werden Lösungen aus Monozinkphosphat, Phosphorsäure und Fluoride verwendet. Die entstehenden Schichten sind etwa 1-5 fum dick und in Säuren sowie Alkalien löslich. Sie werden daher überwiegend als Haftgrund für Anstriche und Kunststoffbeschichtungen verwendet. Bei Außenbeanspruchungen, wie z.B. in Bauwerken werden die Schichten mit einem dünnen, klaren Metacrylat oder Zelluloseacetat-Überzug geschützt, da sonst ein Korrosionsangriff zu befürchten ist (s. Wernick, Pinner, Zurbrügg u. Weiner "Die Oberflächenbehandlung von Aluminium", S. 193).Chromating and phosphating processes are also known, with the aid of which top layers can be applied to aluminum. In an acidic phosphating process, solutions made from monozinc phosphate, phosphoric acid and fluoride are used. The resulting layers are about 1-5 f µm thick and soluble in acids and alkalis. They are therefore mainly used as a primer for paints and plastic coatings. In the case of external stresses, such as in buildings, the layers are protected with a thin, clear methacrylate or cellulose acetate coating, since otherwise there is a risk of corrosion attack (see Wernick, Pinner, Zurbrügg and Weiner "The surface treatment of aluminum", p. 193 ).
Die chemische Oberflächenbehandlung und daraus hergestellte Überzüge, z.B. Chromatschichten sind verhältnismäßig leicht durchführbar, bieten aber keinen sicheren Korrosionsschutz in stark korrosiver Umgebung. Insbesondere, wenn höhere Abnutzungsbeständigkeit und Verschleißfestigkeit verlangt wird, sind chemisch erzeugte Oxidschichten nur als Unterlage für organische Überzüge geeignet.Chemical surface treatment and coatings made therefrom, e.g. Chromate layers are relatively easy to carry out, but do not offer reliable corrosion protection in a highly corrosive environment. In particular, if higher wear resistance and wear resistance is required, chemically produced oxide layers are only suitable as a base for organic coatings.
Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zur Erzeugung korrosionsgeschützter Bauteile zu entwickeln, bei denen die Überzüge verhältnismäßig einfach herstellbar sind, eine hohe Verschleißfestigkeit und Korrosionsbeständigkeit aufweisen.The object of the present invention is to develop a method for producing corrosion-protected components in which the coatings are relatively easy to manufacture, have high wear resistance and corrosion resistance.
Erfindungsgemäß geschieht dies dadurch, daß das Aluminiumbauteil in eine wässrige Zinkatlösung bei Raumtemperatur eingetaucht und nach einer Behandlungsdauer von 1-5 Minuten einer nachfolgenden Spül- und Trocknungsbehandlung unterzogen wird. Die wässrige Zinkatlösung soll dabei folgende Zusammensetzung aufweisen: 100-300 g/1 NaOH und 10-30 g/1 ZnO, wobei die Verhältnisse durch folgende Beziehung festgelegt sind:
- 1. 100 g NaOH und 10 g ZnO
- 2. 200 g NaOH und 20 g ZnO.
- 1. 100 g NaOH and 10 g ZnO
- 2. 200 g NaOH and 20 g ZnO.
Zinkatlösungen dieser Zusammensetzung sind grundsätzlich bekannt. So ist in dem bereits zitierten Buch von Wernick u.a. "Die Oberflächenbehandlung von Aluminium", S. 501 eine ähnliche Zusammensetzung angegeben, wobei diese Zinkatlösung zur Erzielung dünner Zinkschichten für eine nachfolgende Galvanisierung eingesetzt wird.Zincate solutions of this composition are generally known. In the book by Wernick et al. "The surface treatment of aluminum", p. 501 indicated a similar composition, this zincate solution being used to achieve thin layers of zinc for subsequent galvanization.
Es hat sich herausgestellt, daß die Zugabe von 6-13% Si und O,O1-2% Bi oder 0,001-1% Be zu einer verstärkten Zinkabscheidung führt. Zwar ist es grundsätzlich bekannt, daß die Legierungszusammensetzung einen Einfluß auf die Zinkabscheidung bei der Zinkätbehandlung ausübt (s. "Die Oberflächenbehandlung von Aluminium", Werner u.a., S. 502). Diese Untersuchungen galten aber nicht für die erfindungsgemäß ausgewählten Bereiche.It has been found that the addition of 6-13% Si and O, O1-2% Bi or 0.001-1% Be leads to an increased zinc deposition. It is basically known that the alloy composition has an influence on the zinc deposition in the zinc etching treatment (see "The surface treatment of aluminum", Werner et al., p. 502). However, these investigations did not apply to the areas selected according to the invention.
Im folgenden wird die Erfindung an Hand von 2 Beispielen näher erläutert:
- 1. Vergleichsversuch zwischen einem unbehandelten Aluminiumbauteil, einem durch Grünchromatierung geschützten Bauteil und einem erfindungsgemäß behandelten Bauteil, das an den Nahtstellen 10% Si und 0,01% Wismut aufwies. Als Probekörper wurde der aus der Anlage ersichtliche Aufbau gewählt. Die Grünchromatierung wurde bei 450C Badtemperatur mit Alodine 401/45 in einer Eintauchzeit von 1-2 Minuten durchgeführt. Das erfindungsgemäße Behandlungsverfahren wurde in 2 Stufen, und zwar mit 200 g/l NaOH und 20 g/1 ZnO sowie 150 g/1 NaOH und 15 g/1 ZnO durchgeführt. Nach 4 Wochen Wechseltauchtest in 5%-iger Calciumchloridlösung wurden folgende maximale Korrosionstiefen im Querschliff ermittelt:
- Aus diesem Vergleichsversuch ergibt sich, daß die maximale Korrosionstiefe bei dem erfindungsgemäßen Verfahren deutlich gegenüber dem bekannten Verfahren herabgesetzt ist. Besonders vorteilhaft ist die erfindungsgemäße Behandlung mit 150 g/1 NaOH und 15 g/1 ZnO.
- 2. Zum Vergleich mit einer galvanisch erzeugten Schutzschicht wurde ein Grundkörper aus AlZnMg mit einer Zwischenschicht aus Zink und einer galvanisch erzeugten Deckschicht aus Cu, Ni, Cr hergestellt. Demgegenüber wurde ein nach dem erfindungsgemäßen Verfahren geschütztes Bauteil der gleichen Bauart mit nur einer Schicht aus Zink hergestellt.
- 1. Comparison test between an untreated aluminum component, a component protected by green chromating and a component treated according to the invention which had 10% Si and 0.01% bismuth at the seams. The structure shown in the system was selected as the test specimen. The green chromating was carried out at 45 0 C. bath temperature with Alodine 401/45 in an immersion time of 1-2 minutes. The treatment process according to the invention was carried out in two stages, namely with 200 g / l NaOH and 20 g / 1 ZnO and 150 g / 1 NaOH and 15 g / 1 ZnO. After 4 weeks of alternating immersion tests in 5% calcium chloride solution, the following maximum corrosion depths were determined in the cross section:
- It follows from this comparison test that the maximum depth of corrosion in the method according to the invention is significantly reduced compared to the known method. The treatment according to the invention with 150 g / 1 NaOH and 15 g / 1 Z nO is particularly advantageous.
- 2. For comparison with a galvanically generated protective layer, a base body made of AlZnMg with an intermediate layer made of zinc and a galvanically generated top layer made of Cu, Ni, Cr was produced. In contrast, a component of the same type protected with the method according to the invention was produced with only one layer of zinc.
In einem kombinierten Korrosions- und Verschleißtest (Salzsprühnebel und Abriebtest, Steinschlag) zeigten sich bei dem galvanisierten Produkt nach einer anfänglich guten Korrosionsbeständigkeit starke Auflösungen und Zerstörungen der Deckschicht. Dieses ist auf eine erhöhte Kontakt-Korrosion zwischen den galvanisch erzeugten Schichten, insbesondere Cu und der Zwischenschicht Zink bzw. später dem Aluminiumgrundwerkstoff zurückzuführen. Insgesamt ergab dieser Test, daß auch eine kompliziert und aufwendig erzeugte Schutzbehandlung nicht mit einer vergleichsweise dünnen Zinkatschicht gemäß dem erfindungsgemäßen Verfahren konkurrieren kann.In a combined corrosion and wear test (salt spray and abrasion test, stone chipping), the galvanized product showed strong dissolution and destruction of the top layer after initially good corrosion resistance. This is due to increased contact corrosion between the electroplated layers, in particular Cu and the intermediate layer zinc or later the aluminum base material. Overall, this test showed that even a complicated and complex protective treatment cannot compete with a comparatively thin zincate layer in accordance with the method according to the invention.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT83104742T ATE22934T1 (en) | 1982-06-11 | 1983-05-13 | METHOD FOR ELECTRICITY-FREE GENERATION OF ANTI-CORROSION COATINGS ON ALUMINUM COMPONENTS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3222140A DE3222140C2 (en) | 1982-06-11 | 1982-06-11 | Application of the dip galvanizing process to the production of corrosion-protected aluminum components and corrosion-protected aluminum components |
DE3222140 | 1982-06-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0096753A1 true EP0096753A1 (en) | 1983-12-28 |
EP0096753B1 EP0096753B1 (en) | 1986-10-15 |
Family
ID=6165918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83104742A Expired EP0096753B1 (en) | 1982-06-11 | 1983-05-13 | Process for the electroless production of corrosion-inhibiting layers on structural parts of aluminium |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0096753B1 (en) |
JP (1) | JPS596383A (en) |
AT (1) | ATE22934T1 (en) |
DE (1) | DE3222140C2 (en) |
NO (1) | NO159025C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005080633A2 (en) * | 2004-02-17 | 2005-09-01 | Tyco Printed Circuit Group Lp | Method for zinc coating aluminum |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62220837A (en) * | 1986-03-20 | 1987-09-29 | Hitachi Electronics Eng Co Ltd | Surface inspection system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2650886A (en) * | 1951-01-19 | 1953-09-01 | Aluminum Co Of America | Procedure and bath for plating on aluminum |
DE2143965A1 (en) * | 1971-09-02 | 1973-04-26 | Vaw Ver Aluminium Werke Ag | SOLDER FOR FLUX-FREE SOLDERING OF ALUMINUM MATERIALS |
GB1439183A (en) * | 1972-09-26 | 1976-06-09 | Chausson Usines Sa | Method for producing an assembly of articles made of aluminium or aluminium alloy |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3982055A (en) * | 1974-07-25 | 1976-09-21 | Eltra Corporation | Method for zincating aluminum articles |
-
1982
- 1982-06-11 DE DE3222140A patent/DE3222140C2/en not_active Expired
-
1983
- 1983-05-13 EP EP83104742A patent/EP0096753B1/en not_active Expired
- 1983-05-13 AT AT83104742T patent/ATE22934T1/en not_active IP Right Cessation
- 1983-06-08 NO NO832077A patent/NO159025C/en unknown
- 1983-06-10 JP JP58102937A patent/JPS596383A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2650886A (en) * | 1951-01-19 | 1953-09-01 | Aluminum Co Of America | Procedure and bath for plating on aluminum |
DE2143965A1 (en) * | 1971-09-02 | 1973-04-26 | Vaw Ver Aluminium Werke Ag | SOLDER FOR FLUX-FREE SOLDERING OF ALUMINUM MATERIALS |
GB1439183A (en) * | 1972-09-26 | 1976-06-09 | Chausson Usines Sa | Method for producing an assembly of articles made of aluminium or aluminium alloy |
Non-Patent Citations (1)
Title |
---|
S. WERNICK, R. PINNER "Die oberflachenbehandlung von Aluminium", EUGEN G. LEUZE VERLAG, Saulgau/-Wurtt., Germany, 1969, Seiten 493-502 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005080633A2 (en) * | 2004-02-17 | 2005-09-01 | Tyco Printed Circuit Group Lp | Method for zinc coating aluminum |
WO2005080633A3 (en) * | 2004-02-17 | 2006-02-09 | Tyco Printed Circuit Group Lp | Method for zinc coating aluminum |
Also Published As
Publication number | Publication date |
---|---|
JPH032952B2 (en) | 1991-01-17 |
NO159025C (en) | 1988-11-23 |
DE3222140C2 (en) | 1984-05-30 |
JPS596383A (en) | 1984-01-13 |
NO832077L (en) | 1983-12-12 |
NO159025B (en) | 1988-08-15 |
ATE22934T1 (en) | 1986-11-15 |
EP0096753B1 (en) | 1986-10-15 |
DE3222140A1 (en) | 1983-12-15 |
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