EP1464733B1 - Utilisation de molybdate dans un procédé de colmatage d'une couche d'oxyde obtenue par anodisation d'aluminium - Google Patents
Utilisation de molybdate dans un procédé de colmatage d'une couche d'oxyde obtenue par anodisation d'aluminium Download PDFInfo
- Publication number
- EP1464733B1 EP1464733B1 EP02290376A EP02290376A EP1464733B1 EP 1464733 B1 EP1464733 B1 EP 1464733B1 EP 02290376 A EP02290376 A EP 02290376A EP 02290376 A EP02290376 A EP 02290376A EP 1464733 B1 EP1464733 B1 EP 1464733B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bath
- aluminium
- molybdenum oxide
- sealing
- clogging
- 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.)
- Expired - Lifetime
Links
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
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/24—Chemical after-treatment
- C25D11/246—Chemical after-treatment for sealing layers
Definitions
- the present invention relates to a method of clogging by hydration of the obtained oxide layer by anodizing aluminum or an aluminum alloy, devoid of hexavalent chromium.
- Aluminum alloys are, despite the development of composites, the most used on aircraft and helicopter cells. Protection against corrosion and assembly by collage of these materials therefore remain the concerns main.
- chromates to the clogging water allows enhance the corrosion resistance of the film.
- the chromate ion is one of the most important corrosion inhibitors more efficient for aluminum. Inhibition is due to the formation on the surface of the metal of a protective film formed by the reduction of the chromate ion.
- the inventors have given themselves as their goal to find a non-harmful substitute for hexavalent chromium, while maintaining the resistance properties in corrosion of the material and its adhesion properties vis-à-vis paint systems.
- JP-A-02 025592 describes a process for clogging an aluminum oxide layer obtained by anodization.
- the sealing bath is an aqueous solution of molybdate containing a benzotriazole or a tolytriazole and the molybdate used can be Na 2 MoO 4 or K 2 MoO 4 at a concentration of preferably between 500 and 5000 ppm, that is to say ie 0.5 and 5 g / l. No pH value or immersion time or hydration rate is specified.
- molybdenum oxide could be used as a substitute for chromium hexavalent in the clogging process.
- the of hydration represents in mass the quantity of fixed water when clogging compared to the total mass of the coating (alumina + water).
- the molybdenum oxide is present in the form of salt, preferably in the form of sodium molybdate, potassium or ammonium, or in the form of a complex, of preferably in the form of an amine and acid complex molybdic.
- the molybdenum oxide is present in the form of ammonium molybdate.
- Ammonium molybdate can be used directly as a salt containing 85% MoO 3 or can be used in the form of pure molybdenum oxide with added ammonia according to the following equation: 7 MoO 3 + 6 NH 4 OH ⁇ (NH 4 ) 6 Mo 7 O 24 + 3H 2 O
- the pH of the clogging baths used in the according to the invention is stabilized at 6 +/- 1 by addition of a buffer salt such as, for example, acetate ammonium.
- the sealing method according to the invention can be used on pure aluminum or alloys aluminum type 2024 T3, 5086 or 7075 T73 previously anodized according to anodizing method conventional methods, such as of sulfuric, chromic, alkaline or sulfoborique.
- Parts obtained after clogging according to the present invention have very good resistance to corrosion, between 500 and 750 hours and the hydration levels correspond to those observed with a classic clogging in the presence of chromium Hexavalent.
- the paint system offers perfect adhesion, as well as excellent performance at salt spray corresponding to that which we obtain with chromic oxidation followed by clogging with hexavalent chromium.
- the measurement of the hydration rate is carried out by a gravimetric measurement of the hydration of the coating.
- the thickness of the layer is measured by a test according to the ISO 2360 standard; the clogging is measured by the method dye absorption system, referenced NF A 91408, and the continuity of the layer is measured by the test ISO 2085 standard.
- the adhesion of the paint was measured according to described by the company PRC-De Soto which includes the successive application of a layer of primer P99, based on phenolic butyral, then deposit of an anticorrosion primer PAC 33, then a layer polyurethane-based PU 66 finishes, the above designations being registered trademarks of the PRC-De Soto company.
- the first layer has a thickness of 4 to 11 ⁇ m, the total of the first two layers a thickness of 14 to 29 ⁇ m, and the total of the three layers a thickness of 39 to 64 ⁇ m.
- test pieces are anodized for about 40 minutes to one hour in a bath containing 35 to 60 g / l of chromic acid at a voltage of between 5 and 90 volts and a density of the electric current of 0.5 to 50 amperes / cm 2 .
- the anodized part is rinsed for about 2 minutes and immersed in a clogging bath containing either 85% MoO 3 ammonium molybdate added directly to the bath or ammonium molybdate prepared by adding ammonia to MoO. 3 according to the equation 7 MoO 3 + 6 NH 4 OH ⁇ (NH 4 ) 6 Mo 7 O 24 + 3H 2 O
- the duration of immersion in the clogging bath is 20 minutes and the bath temperature is 97 ° C.
- the clogging bath comprises 3.6 g / l MoO 3 to which NH 4 OH ammonia and ammonium acetate have been added.
- the bath temperature is 97 ° C and the immersion time is 40 minutes.
- the test pieces used are 2024 T3 and 7075 T7 test pieces.
- a series of test pieces is used to measure the adhesion of painting, the other series is used to evaluate the resistance corrosion.
- the hydration rate, the layer thickness, the layer continuity and absorption tests of dye are compliant.
- the paint system offers perfect adhesion before and after immersion in the water, as well as an excellent held in salt spray.
- Parts processed by the process of the invention have a thickness, a continuity of layer, a absorption of dyes identical to those gets after chromic anodizing and clogging with hexavalent chromium.
- the corrosion resistance measured by the holding of the salt spray is quite satisfactory and well over 500 hours of exposure.
- the paint system offers a perfect adhesion and excellent hold salt mist also corresponding to that which one gets after chromic oxyanodization and clogging with hexavalent chromium.
Landscapes
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Sealing Material Composition (AREA)
- Paints Or Removers (AREA)
Description
- base du bain: eau déminéralisée contenant un agent anticorrosion à base d'oxyde de molybdène (MoO3) à raison de 1 à 5 g/l d'oxyde de molybdène,
- température du bain: 90-100 °C,
- durée d'immersion: 20-60 minutes, et
- pH du bain: 6 +/- 1,
- base du bain: eau déminéralisée contenant un agent anticorrosion à base d'oxyde de molybdène (MoO3) à raison de 3,6 g/l d'oxyde de molybdène, 0,75 g/l d'ammoniaque et 3 g/l d'acétate d'ammonium,
- température du bain: 97°C, et
- durée d'immersion: 40 minutes.
- base du bain: eau déminéralisée contenant un agent anticorrosion à base d'oxyde de molybdène (MoO3) à raison de 1 à 5 g/l d'oxyde de molybdène,
- température du bain: 90-100 °C,
- durée d'immersion: 20-60 minutes, et
- pH du bain: 6 +/- 1,
[ ] du bain | Température | Temps de colmatage | % hydratation | Tenue brouillard salin | Epaisseur courant de Foucault | Test d'absorp -tion de colorant |
Molybdate d'ammonium 1 g/l | 97°C | 20 min | 29,7 | 550 h | 3,2 | 0 |
oxyde de molybdène 1 g/l + ammoniaque | 97°C | 20 min | 30 | 600 h | 3,5 | 0 |
Molybdate d'ammonium 1 g/l | 97°C | 20 min | 29,5 | 600 h | 3 | 0 |
oxyde de molybdène + ammoniaque 1 g/l | 97°C | 20 min | 28,7 | 650 h | 3,3 | 0 |
[ ] du bain | Température | Temps de colmatage | % hydratation | Tenue brouillard salin | Epaisseur courant de Foucault | Test d'absorption de colorant |
1 g/l | 85 °C | 5 | 2,5 | 288 | 2,8 | 5 |
10 | 2,5 | 288 | 2,9 | 5 | ||
15 | 2,1 | 288 | 2,8 | 5 | ||
20 | 3,0 | 288 | 2,8 | 5 | ||
30 | 3,6 | 288 | 2,9 | 5 | ||
40 | 2,7 | 288 | 2,9 | 5 | ||
1 g/l | 97°C | 5 | 5,1 | 450 | 2,9 | 5 |
10 | 6,7 | 450 | 3,0 | 5 | ||
15 | 6,7 | 450 | 3,0 | 5 | ||
20 | 6,3 | 450 | 3,0 | 5 | ||
30 | 10,2 | 450 | 3,2 | 2-3 | ||
40 | 20,6 | 450 | 3,0 | 1-2 | ||
3,6 g/l | 85°C | 5 | 4,8 | 450 | 3,0 | 5 |
10 | 5,2 | 450 | 3,0 | 5 | ||
15 | 5,8 | 450 | 3,0 | 5 | ||
20 | 6,1 | 450 | 3,0 | 5 | ||
30 | 5,7 | 450 | 3,0 | 5 | ||
40 | 6,0 | 450 | 3,0 | 5 | ||
3,6 g/l | 97°C | 5 | 5,7 | 556 | 3,0 | 5 |
10 | 5,9 | 556 | 3,0 | 5 | ||
15 | 10,7 | 556 | 3,2 | 2-3 | ||
20 | 12,0 | 556 | 3,2 | 2 | ||
30 | 13,1 | 700 | 3,3 | 2 | ||
40 | 19,9 | 700 | 3,0 | 1-2 |
Alliages | [ ] du bain (g/l) | Température | Temps de Colmatage | % hydratation | Tenue Brouillard salin | Epaisseur courant de Foucault | Test d'absorption de colorant |
2024 T3 | 3,6 | 97°C | 40 min | 21,1 | 670 h | 4,0 | 0-1 |
7075 T7 | 3,6 | 97°C | 40 min | 22,4 | 540 h | 3,1 | 0-1 |
Alliages | Q+S | Q+S+H2O | Tenue brouillard salin |
2024 T3 | 0 | 0 | 3 000 heures RAS |
7075 T7 | 0 | 0 | 3 000 heures RAS |
Claims (5)
- Procédé de colmatage par hydratation de la couche d'oxyde obtenue par anodisation d'aluminium ou d'un alliage d'aluminium, caractérisé en ce que le bain de colmatage est réalisé dans les conditions suivantes:base du bain: eau déminéralisée contenant un agent anticorrosion à base d'oxyde de molybdène (MoO3) à raison de 1 à 5 g/l d'oxyde de molybdène,température du bain: 90-100°C,durée d'immersion: 20-60 minutes,pH du bain: 6 +/- 1,
- Procédé de colmatage selon la revendication 1, caractérisé en ce que l'oxyde de molybdène est présent sous forme de sel, de préférence sous forme de molybdate de sodium, de potassium ou d'ammonium ou sous forme d'un complexe, de préférence sous forme d'un complexe d'amine et d'acide molybdique.
- Procédé de colmatage selon la revendication 1, caractérisé en ce que l'oxyde de molybdène est présent sous forme de molybdate d'ammonium.
- Procédé de colmatage selon la revendication 1, caractérisé en ce que le bain de colmatage est réalisée dans les conditions suivantes:base du bain: eau déminéralisée contenant un agent anticorrosion à base d'oxyde de molybdène (MoO3) à raison de 3,6 g/l d'oxyde de molybdène, 0,75 g/l d'ammoniaque et 3 g/l d'acétate d'ammonium,température du bain: 97°C, etdurée d'immersion: 40 minutes.
- Procédé de préparation de pièces d'aluminium ou d'alliage d'aluminium anodisées et colmatées, caractérisé en ce que le colmatage est réalisé selon l'une quelconque des revendications 1 à 4.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60203945T DE60203945T8 (de) | 2002-02-15 | 2002-02-15 | Verwendung eines Molybdats in einem Verfahren zur Versieglung von anodischen Oxidschichten auf Aluminium |
ES02290376T ES2238058T3 (es) | 2002-02-15 | 2002-02-15 | Utilizacion de molibdato en un procedimiento de colmatado de una capa de oxido obtenida por anodizacion de aluminio. |
AT02290376T ATE294265T1 (de) | 2002-02-15 | 2002-02-15 | Verwendung eines molybdats in einem verfahren zur versieglung von anodischen oxidschichten auf aluminium |
EP02290376A EP1464733B1 (fr) | 2002-02-15 | 2002-02-15 | Utilisation de molybdate dans un procédé de colmatage d'une couche d'oxyde obtenue par anodisation d'aluminium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02290376A EP1464733B1 (fr) | 2002-02-15 | 2002-02-15 | Utilisation de molybdate dans un procédé de colmatage d'une couche d'oxyde obtenue par anodisation d'aluminium |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1464733A1 EP1464733A1 (fr) | 2004-10-06 |
EP1464733B1 true EP1464733B1 (fr) | 2005-04-27 |
Family
ID=32842681
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02290376A Expired - Lifetime EP1464733B1 (fr) | 2002-02-15 | 2002-02-15 | Utilisation de molybdate dans un procédé de colmatage d'une couche d'oxyde obtenue par anodisation d'aluminium |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1464733B1 (fr) |
AT (1) | ATE294265T1 (fr) |
DE (1) | DE60203945T8 (fr) |
ES (1) | ES2238058T3 (fr) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2812116C2 (de) * | 1977-03-30 | 1982-06-03 | Yoshida Kogyo K.K., Tokyo | Verfahren zum Aufbringen eines härtbaren Überzugs auf eine gedichtete anodische Oxidschicht auf Aluminium |
US4515919A (en) * | 1983-05-09 | 1985-05-07 | Lockheed Corporation | Protective coating composition and process for aluminum and aluminum alloys |
JPH0225592A (ja) * | 1988-07-14 | 1990-01-29 | Fujitsu Ltd | 陽極酸化皮膜の封孔処理方法 |
US5205922A (en) * | 1990-11-20 | 1993-04-27 | The United States Of America As Represented By The Secretary Of The Navy | Formation of pitting resistant anodized films on aluminum |
-
2002
- 2002-02-15 DE DE60203945T patent/DE60203945T8/de active Active
- 2002-02-15 ES ES02290376T patent/ES2238058T3/es not_active Expired - Lifetime
- 2002-02-15 AT AT02290376T patent/ATE294265T1/de not_active IP Right Cessation
- 2002-02-15 EP EP02290376A patent/EP1464733B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE60203945T2 (de) | 2006-02-23 |
ES2238058T3 (es) | 2005-08-16 |
ATE294265T1 (de) | 2005-05-15 |
EP1464733A1 (fr) | 2004-10-06 |
DE60203945T8 (de) | 2006-07-27 |
DE60203945D1 (de) | 2005-06-02 |
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Inventor name: GIGANDET, MARIE PIERRE Inventor name: RICHARD, JEAN PIERRE Inventor name: MOUTARLIER, VIRGINIE Inventor name: PAGETTI, JACQUES Inventor name: BRAULT, CLAUDE |
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