EP0545785A1 - Verfahren zum Abdichten einer in einem Chromsäurebad erzeugten Anodisierungsbeschichtung - Google Patents
Verfahren zum Abdichten einer in einem Chromsäurebad erzeugten Anodisierungsbeschichtung Download PDFInfo
- Publication number
- EP0545785A1 EP0545785A1 EP92403190A EP92403190A EP0545785A1 EP 0545785 A1 EP0545785 A1 EP 0545785A1 EP 92403190 A EP92403190 A EP 92403190A EP 92403190 A EP92403190 A EP 92403190A EP 0545785 A1 EP0545785 A1 EP 0545785A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- clogging
- bath
- test pieces
- weight
- oxide layer
- 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
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 7
- 239000011248 coating agent Substances 0.000 title claims abstract description 5
- 238000000576 coating method Methods 0.000 title claims abstract description 5
- 238000000034 method Methods 0.000 title claims description 18
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 title 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 title 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910001868 water Inorganic materials 0.000 claims abstract description 15
- 230000036571 hydration Effects 0.000 claims abstract description 12
- 238000006703 hydration reaction Methods 0.000 claims abstract description 12
- 238000005260 corrosion Methods 0.000 claims abstract description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 10
- 230000007797 corrosion Effects 0.000 claims abstract description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000007743 anodising Methods 0.000 claims abstract description 6
- 238000007654 immersion Methods 0.000 claims abstract description 5
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 4
- 239000011591 potassium Substances 0.000 claims abstract description 4
- JHWIEAWILPSRMU-UHFFFAOYSA-N 2-methyl-3-pyrimidin-4-ylpropanoic acid Chemical compound OC(=O)C(C)CC1=CC=NC=N1 JHWIEAWILPSRMU-UHFFFAOYSA-N 0.000 claims abstract description 3
- 235000011121 sodium hydroxide Nutrition 0.000 claims abstract description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 8
- 238000002048 anodisation reaction Methods 0.000 claims description 7
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 3
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 2
- ABXXWVKOBZHNNF-UHFFFAOYSA-N chromium(3+);dioxido(dioxo)chromium Chemical compound [Cr+3].[Cr+3].[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O ABXXWVKOBZHNNF-UHFFFAOYSA-N 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000003973 paint Substances 0.000 abstract description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 2
- ZTQSAGDEMFDKMZ-UHFFFAOYSA-N Butyraldehyde Chemical compound CCCC=O ZTQSAGDEMFDKMZ-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- HIGRAKVNKLCVCA-UHFFFAOYSA-N alumine Chemical compound C1=CC=[Al]C=C1 HIGRAKVNKLCVCA-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002966 varnish Substances 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
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
Definitions
- the present invention relates to a method for sealing an anodization layer obtained in a chromic bath, and more precisely to such an anodization layer obtained according to a method of a type allowing high performance to be obtained.
- which relates to corrosion resistance, in particular in a saline environment.
- Corrosion resistance is a very important requirement for the aeronautical industry. Test standards and requirements vary somewhat between manufacturers, but still correspond to a high level of performance, and there are several chromic anodizing processes intended to achieve them.
- Anodizing layers when not clogged offer low corrosion resistance and good adhesion of the paint. When they are clogged at the maximum hydration rate, they offer good resistance to corrosion but less good adhesion of the paint.
- the present invention therefore aims to reconcile two contradictory requirements: on the one hand, very good resistance to corrosion in a saline environment, and very good adhesion of a paint.
- the hydration rate referred to here represents, by mass, the amount of water fixed during clogging, relative to the total mass of the coating (alumina + water). This hydration rate is determined by a test on a test tube.
- test pieces are immediately rinsed (demineralized water), brought back to the laboratory and dried with compressed air. They are then weighed, ie P1 the weight of the test piece before clogging. As the weighings progress, the test pieces are replaced on the tools and stored in the laboratory. The duration of the weighing operation does not exceed 5 minutes.
- a clogging is carried out as indicated above.
- the assemblies are removed, rinsed with demineralized water and dried with compressed air.
- the test pieces are weighed again, ie P2 the weight of the test piece after clogging.
- the test pieces are weighed a third time after dissolving the oxide layer in a phosphochromic solution, ie P3 the weight of the test piece devoid of its oxide layer.
- test pieces All these manipulations of test pieces are done in white gloves, holding the test pieces by the edges.
- This anodization process is described in document FR-A-2,278,790, which describes a process for the anodic oxidation of alloyed or unalloyed aluminum, according to which a bath is used which contains, in new condition, between 20 and 100 grams per liter of chromic anhydride CrO3 and an amount of chromium chromate (CrO4) 3 Cr2 between 0.5 gram per liter and an upper limit which is, depending on the case, 15 grams per liter, or the limit of solubility of this compound at the temperature of use of the bath.
- the electrolysis is carried out under a voltage of between 5 and 90 volts, at a temperature below 65 ° C.
- This process makes it possible to build a layer capable of ensuring good resistance to corrosion, in particular in a saline atmosphere, after clogging, for example, in demineralized water at boiling point. Without clogging, it is specified in the patent that the layer obtained provides a very good base for glues, varnishes and paints.
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)
- Paints Or Removers (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9114777 | 1991-11-29 | ||
| FR9114777A FR2684393B1 (fr) | 1991-11-29 | 1991-11-29 | Procede de colmatage d'une couche d'anodisation obtenue en bain chromique. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0545785A1 true EP0545785A1 (de) | 1993-06-09 |
| EP0545785B1 EP0545785B1 (de) | 1996-05-15 |
Family
ID=9419487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19920403190 Expired - Lifetime EP0545785B1 (de) | 1991-11-29 | 1992-11-26 | Verfahren zum Abdichten einer in einem Chromsäurebad erzeugten Anodisierungsbeschichtung |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0545785B1 (de) |
| DE (1) | DE69210773T2 (de) |
| EG (1) | EG19803A (de) |
| ES (1) | ES2096738T3 (de) |
| FR (1) | FR2684393B1 (de) |
| GR (1) | GR3020000T3 (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0732426A1 (de) * | 1995-03-16 | 1996-09-18 | Alusuisse-Lonza Services AG | Verfahren zur kontinuierlichen anodischen Oxidation von Bändern oder Drähten aus Aluminium |
| EP1780313A3 (de) * | 2005-10-25 | 2009-01-21 | Goodrich Corporation | Behandeltes Aluminium und Herstellungsverfahren dafür |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4256547A (en) * | 1979-07-12 | 1981-03-17 | General Dynamics Corporation | Universal chromic acid anodizing method |
-
1991
- 1991-11-29 FR FR9114777A patent/FR2684393B1/fr not_active Expired - Fee Related
-
1992
- 1992-11-24 EG EG72092A patent/EG19803A/xx active
- 1992-11-26 EP EP19920403190 patent/EP0545785B1/de not_active Expired - Lifetime
- 1992-11-26 ES ES92403190T patent/ES2096738T3/es not_active Expired - Lifetime
- 1992-11-26 DE DE1992610773 patent/DE69210773T2/de not_active Expired - Lifetime
-
1996
- 1996-05-22 GR GR960401375T patent/GR3020000T3/el unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4256547A (en) * | 1979-07-12 | 1981-03-17 | General Dynamics Corporation | Universal chromic acid anodizing method |
Non-Patent Citations (1)
| Title |
|---|
| S.WERNICK & R.PINNER 'the surface treatment and finishing of aluminium and its alloys' 1972 , ROBERT DRAPER LTD , GREAT BRITAIN * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0732426A1 (de) * | 1995-03-16 | 1996-09-18 | Alusuisse-Lonza Services AG | Verfahren zur kontinuierlichen anodischen Oxidation von Bändern oder Drähten aus Aluminium |
| CH689395A5 (de) * | 1995-03-16 | 1999-03-31 | Alusuisse Lonza Services Ag | Verfahren zur kontinuierlichen anodischen Oxidation von Baendern oder Draehten aus Aluminium. |
| EP1780313A3 (de) * | 2005-10-25 | 2009-01-21 | Goodrich Corporation | Behandeltes Aluminium und Herstellungsverfahren dafür |
| US7527872B2 (en) | 2005-10-25 | 2009-05-05 | Goodrich Corporation | Treated aluminum article and method for making same |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69210773D1 (de) | 1996-06-20 |
| ES2096738T3 (es) | 1997-03-16 |
| EP0545785B1 (de) | 1996-05-15 |
| DE69210773T2 (de) | 1997-01-16 |
| EG19803A (en) | 1996-03-31 |
| GR3020000T3 (en) | 1996-08-31 |
| FR2684393A1 (fr) | 1993-06-04 |
| FR2684393B1 (fr) | 1994-12-09 |
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