EP0399168A1 - Verfahren zum Verdichten einer anodisch erzeugten Oxydschicht auf Teilen aus Aluminium oder Aluminium-Legierungen - Google Patents
Verfahren zum Verdichten einer anodisch erzeugten Oxydschicht auf Teilen aus Aluminium oder Aluminium-Legierungen Download PDFInfo
- Publication number
- EP0399168A1 EP0399168A1 EP90105557A EP90105557A EP0399168A1 EP 0399168 A1 EP0399168 A1 EP 0399168A1 EP 90105557 A EP90105557 A EP 90105557A EP 90105557 A EP90105557 A EP 90105557A EP 0399168 A1 EP0399168 A1 EP 0399168A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oxide layer
- aluminium
- parts
- anodically
- densifying
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 9
- 229910000838 Al alloy Chemical group 0.000 title claims abstract description 7
- 239000004411 aluminium Substances 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- DBJLJFTWODWSOF-UHFFFAOYSA-L nickel(ii) fluoride Chemical compound F[Ni]F DBJLJFTWODWSOF-UHFFFAOYSA-L 0.000 claims abstract description 5
- 229910021583 Cobalt(III) fluoride Inorganic materials 0.000 claims abstract description 4
- YCYBZKSMUPTWEE-UHFFFAOYSA-L cobalt(ii) fluoride Chemical compound F[Co]F YCYBZKSMUPTWEE-UHFFFAOYSA-L 0.000 claims abstract description 4
- 150000003918 triazines Chemical class 0.000 claims abstract description 4
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 239000002455 scale inhibitor Substances 0.000 claims description 3
- 229910001868 water Inorganic materials 0.000 abstract description 8
- 239000003112 inhibitor Substances 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000007906 compression Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010407 anodic oxide Substances 0.000 description 1
- 239000000987 azo dye Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- C25D11/24—Chemical after-treatment
- C25D11/246—Chemical after-treatment for sealing layers
Definitions
- the invention relates to a method for compacting an anodic oxide layer on parts made of aluminum or aluminum alloys.
- Aluminum parts such as aluminum pressed or rolled profiles, are used, for example, in the building hardware and lighting industry or in particular in motor vehicle construction, for example with window frame systems or as decorative frames, moldings and. Like. Used.
- parts made of aluminum or aluminum alloys are used which have an anodically produced, primarily also colored, anodized layer.
- the parts are formed with anodized layer thicknesses of approx. 20 ⁇ m, because it has previously been assumed that such layer thicknesses are necessary in order to produce, for example, intensive colorations with a sufficient corrosion protection value.
- Eloxal istdicken of 20 microns are required so that during compression of the layers a sufficient crystal water absorption at temperatures of 98 o C occurs, in order to achieve a lattice transformation of the layer close the pores, so that the previously in the layers included substances are firmly enclosed.
- Eloxal layer thicknesses of 20 ⁇ m and more are disadvantageous because the gloss level of the surface is considerably reduced and the optically positive impression is thereby negatively changed.
- the 20 ⁇ m anodized layer can tear into fine hairline cracks under mechanical and thermal stress. The parts are unusable because the hairline cracks can lead to corrosion.
- considerably longer residence times (100%) in the anodized baths are necessary to build up the 20 ⁇ m anodized layer. This results in higher costs for producing the anodized layer.
- the present invention has for its object to improve a method of the type mentioned in such a way that parts made of aluminum or aluminum alloys with relatively thin anodized anodized layers can be achieved with and without coloring, with high wear and corrosion protection values.
- the object is achieved in that the oxide layer is compressed in two process stages, the parts in the first process stage in a solution with about 6% cobalt fluoride and about 30% nickel fluoride in demineralized water at about 30 o C about 10 Pretreated for minutes and aftertreated in a second process step in demineralized water with the addition of a scale inhibitor of about 2 ml / l triazine derivative at an operating temperature of about 70 ° C. for about 50 minutes.
- the measures according to the invention result in the particular advantage of being able to produce anodized layers of aluminum or the like parts now with particularly thin anodized layers (10-12 ⁇ m) with a high wear and corrosion protection value.
- the process for producing a part from aluminum or an aluminum alloy is as follows:
- the parts are first mechanically ground and polished. After the subsequent degreasing or cleaning of the parts, they are electrolytically alkaline polished, all the more so to achieve a sufficiently shiny surface reflection. After the polishing process, the parts are first anodized electrolytically under direct current for coloring. In the next step, the parts are exposed in an electrolyte containing metal salts using alternating current. In a subsequent process step, the adsorptive capacity of the oxide layer produced is used to variably change the basic color by chemical incorporation of an organic azo dye. In two further process steps - and this is where the invention comes into play - the oxide layer of the parts is compressed as the last treatment stage and thus protected against external influences.
- the parts are first pretreated in a solution with 6% cobalt fluoride and about 30% nickel fluoride in deionized water at 30 ° C. for about 10 minutes.
- the basic reaction with the oxide layer and the nickel fluoride is essentially as follows: In this first stage of the compression process, a constant pre-compression of the oxide layer is achieved.
Landscapes
- Chemical & Material Sciences (AREA)
- General 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)
- Laminated Bodies (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19893917187 DE3917187A1 (de) | 1989-05-26 | 1989-05-26 | Verfahren zum verdichten einer anodisch erzeugten oxydschicht auf teilen aus aluminium oder aluminium-legierungen |
| DE3917187 | 1989-05-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0399168A1 true EP0399168A1 (de) | 1990-11-28 |
Family
ID=6381455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90105557A Withdrawn EP0399168A1 (de) | 1989-05-26 | 1990-03-23 | Verfahren zum Verdichten einer anodisch erzeugten Oxydschicht auf Teilen aus Aluminium oder Aluminium-Legierungen |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0399168A1 (enrdf_load_stackoverflow) |
| JP (1) | JPH0313597A (enrdf_load_stackoverflow) |
| DE (1) | DE3917187A1 (enrdf_load_stackoverflow) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5362569A (en) * | 1993-03-22 | 1994-11-08 | Bauman Albert J | Anodizing and duplex protection of aluminum copper alloys |
| RU2122605C1 (ru) * | 1996-06-04 | 1998-11-27 | Самарский государственный аэрокосмический университет им.С.П.Королева | Способ наполнения анодных оксидных покрытий на алюминиевых сплавах |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3327191A1 (de) * | 1982-08-07 | 1984-02-09 | Sandoz-Patent-GmbH, 7850 Lörrach | Verfahren zum verdichten von anodisch oxydierten oberflaechen aus aluminium |
| EP0127774A2 (de) * | 1983-05-03 | 1984-12-12 | Elia Maria Alvarez Sanchis | Verfahren zum Schutz von anodisch oxidiertem Aluminium |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3641766A1 (de) * | 1986-12-06 | 1988-06-09 | Erbsloeh Julius & August | Verfahren zur erzeugung licht- und wetterechter anodisierter und eingefaerbter schichten auf aluminium und aluminiumlegierungen |
-
1989
- 1989-05-26 DE DE19893917187 patent/DE3917187A1/de active Granted
-
1990
- 1990-03-23 EP EP90105557A patent/EP0399168A1/de not_active Withdrawn
- 1990-05-28 JP JP13554290A patent/JPH0313597A/ja active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3327191A1 (de) * | 1982-08-07 | 1984-02-09 | Sandoz-Patent-GmbH, 7850 Lörrach | Verfahren zum verdichten von anodisch oxydierten oberflaechen aus aluminium |
| EP0127774A2 (de) * | 1983-05-03 | 1984-12-12 | Elia Maria Alvarez Sanchis | Verfahren zum Schutz von anodisch oxidiertem Aluminium |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3917187A1 (de) | 1990-11-29 |
| DE3917187C2 (enrdf_load_stackoverflow) | 1991-02-28 |
| JPH0577756B2 (enrdf_load_stackoverflow) | 1993-10-27 |
| JPH0313597A (ja) | 1991-01-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19900813 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE ES FR GB IT SE |
|
| 17Q | First examination report despatched |
Effective date: 19920421 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19921111 |