EP0281176B1 - Procédé de prétraitement avant laquage de pièces en aluminium ou ses alliages - Google Patents
Procédé de prétraitement avant laquage de pièces en aluminium ou ses alliages Download PDFInfo
- Publication number
- EP0281176B1 EP0281176B1 EP88200205A EP88200205A EP0281176B1 EP 0281176 B1 EP0281176 B1 EP 0281176B1 EP 88200205 A EP88200205 A EP 88200205A EP 88200205 A EP88200205 A EP 88200205A EP 0281176 B1 EP0281176 B1 EP 0281176B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- workpieces
- treatment
- hydrofluoric acid
- process according
- hno3
- 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
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
-
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
Definitions
- the invention relates to a method for the preparation of workpieces with surfaces of aluminum and its alloys, which have at least partially been subjected to a mechanical, metal-removing surface treatment, for subsequent painting and its application to the treatment of workpieces with surfaces of alloys of the type AlMg or AlMgMn or the thermosetting type AlMgSi.
- the work leading to the present invention initially provided the knowledge that the poor paint adhesion and resistance to infiltration occurs particularly strongly on pre-ground or similarly metal-machined aluminum surfaces, while the undisturbed rolled surface usually provides a much better quality profile.
- the object of the invention is to provide a method for the preparation of workpieces with surfaces of aluminum or its alloys, which have at least partially been subjected to a mechanical, metal-removing surface treatment, for the subsequent painting, which does not have the disadvantages described.
- the object is achieved by designing the method of the type mentioned at the outset in accordance with the invention in such a way that the workpieces are first treated by annealing and / or pickling in oxidizing acid medium and then by green chromating, yellow chromating, colorless chromating, chromium-free treatment based on titanium and / or zirconium hydrofluoric acid or a fluoride-activated phosphating based on alkali and / or zinc and / or nickel and / or manganese and / or calcium and / or magnesium phosphate coated with a conversion layer.
- mechanical, metal-removing surface treatment means a surface treatment, such as Grinding, scratching, turning, milling, blasting.
- the glow level can be in the temperature range of e.g. 150 to 500 ° C at times of e.g. 5 minutes to several hours in the presence of air. It is believed that the beneficial effect of annealing is due to the build-up and densification of a natural oxide layer.
- Solutions proved to be favorable which contain HNO3, H2SO4 + peroxide, H2SO4 + FeIII.
- simple and / or complex fluorides e.g. in amounts of 0.2 to 50 g / l, added.
- HNO3 can be present, for example, in concentrations of 10 to 500 g / l, preferably 200 to 450 g / l, H2SO4, for example in concentrations of 10 to 150 g / l, F-containing acids, for example in concentrations of 5 to 100 g / l.
- the oxidizing agent FeIII is used, for example, in amounts of 5 to 50 g / l, peroxide, for example in amounts of 0.5 to 30 g / l.
- Proven pickling solutions have e.g. the following composition: 350 to 400 g / l HNO3 + 5 to 15 g / l HF; 250 to 400 g / l HNO3; 75 to 100 g / l H2SO4 + 10 to 25 g / l FeIII (as sulfate) + 0.5 to 2 g / l HF.
- the pickling solutions can be used by spraying and dipping in the temperature range from 15 to 45 ° C and with exposure times from 20 sec to 5 min.
- the surface Before the treatment in the acidic oxidizing medium or by annealing, the surface must be freed from disturbing amounts of oils, fats, dust and dirt. This can be done by the action of cleaners based on organic solvents or mildly acidic, neutral or alkaline aqueous cleaning agents. Furthermore, a treatment in sodium hydroxide or potassium hydroxide solution, if appropriate with additives to complexing agents, can be carried out for cleaning and pickling the surface.
- a particularly preferred embodiment of the invention is to first pickle the workpieces in HNO3 + HF and / or HNO3 and then to coat them with a conversion layer by yellow chromating or fluoride-activated zinc manganese phosphating.
- the process according to the invention is suitable as a pretreatment for all known painting processes. However, it proves to be particularly advantageous before the application of powder, high-solid and anodic and cathodic electrocoat materials.
- the method according to the invention is for the treatment of workpieces made of aluminum or aluminum alloys, for example with Si, Fe, Cu, Mn, Mg, Cr, Zn and Ti as an alloy component. It is particularly advantageously applicable to the treatment of workpieces with surfaces of alloys of the AlMg or AlMgMn type or the thermosetting AlMgSi type.
- the workpieces can be, for example, sheet metal, solid or hollow profiles and cast parts.
- the sheets were then coated with a cathodic electrocoat and a two-layer automotive paint system, scribed with a hard metal pen to the metal surface and subjected to various tests (see Tables 1 and 2).
Landscapes
- 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)
- ing And Chemical Polishing (AREA)
Claims (7)
en une étape ou plusieurs étapes successives.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873705633 DE3705633A1 (de) | 1987-02-21 | 1987-02-21 | Verfahren zur vorbereitung von werkstuecken aus aluminium oder dessen legierungen fuer die lackierung |
DE3705633 | 1987-02-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0281176A1 EP0281176A1 (fr) | 1988-09-07 |
EP0281176B1 true EP0281176B1 (fr) | 1991-09-25 |
Family
ID=6321505
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88200205A Expired - Lifetime EP0281176B1 (fr) | 1987-02-21 | 1988-02-05 | Procédé de prétraitement avant laquage de pièces en aluminium ou ses alliages |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0281176B1 (fr) |
BR (1) | BR8800681A (fr) |
DE (2) | DE3705633A1 (fr) |
ES (1) | ES2025763T3 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4131382A1 (de) * | 1990-09-21 | 1992-03-26 | Kobe Steel Ltd | Oberflaechenbehandeltes aluminiumlegierungsblech fuer den automobilbau und verfahren zu dessen herstellung |
KR960004783B1 (ko) * | 1991-09-04 | 1996-04-13 | 후루카와알루미늄코교 카부시키가이샤 | 자동차차체용 알루미늄합금판 및 그 제조방법 |
US6168868B1 (en) * | 1999-05-11 | 2001-01-02 | Ppg Industries Ohio, Inc. | Process for applying a lead-free coating to untreated metal substrates via electrodeposition |
ES2556168T3 (es) * | 2005-08-19 | 2016-01-13 | Chemetall Gmbh | Composición de acondicionamiento de superficies, método para producción de la misma, y método de acondicionamiento de superficies |
DE102007037903A1 (de) * | 2007-08-10 | 2009-02-12 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Verfahren zur Reinigung von Oberflächen sowie Verwendung des Verfahrens |
CN110541169B (zh) * | 2018-06-29 | 2021-12-28 | 蓝思科技股份有限公司 | 一种用于脱除工件表面镀层的褪镀液及褪镀方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2705500A (en) * | 1953-11-04 | 1955-04-05 | Leon L Deer | Cleaning aluminum |
DE1149965B (de) * | 1957-06-07 | 1963-06-06 | Ver Leichtmetallwerke Gmbh | Verfahren zur Verbesserung der Haftfestigkeit von organischen Stoffen auf Aluminium oder Aluminiumlegierungen |
US3331710A (en) * | 1963-08-23 | 1967-07-18 | Hooker Chemical Corp | Method for coating aluminum |
ES350042A1 (es) * | 1968-02-01 | 1969-04-16 | Gasion Emperador | Un procedimiento para el pintado indeleble del aluminio. |
US3692583A (en) * | 1971-03-01 | 1972-09-19 | Fmc Corp | Desmutting etched aluminum alloys |
US3728188A (en) * | 1971-07-29 | 1973-04-17 | Amchem Prod | Chrome-free deoxidizing and desmutting composition and method |
JPS61106783A (ja) * | 1984-10-30 | 1986-05-24 | Nippon Paint Co Ltd | アルミニウム表面洗浄剤 |
-
1987
- 1987-02-21 DE DE19873705633 patent/DE3705633A1/de not_active Withdrawn
-
1988
- 1988-02-05 DE DE8888200205T patent/DE3865045D1/de not_active Expired - Lifetime
- 1988-02-05 ES ES198888200205T patent/ES2025763T3/es not_active Expired - Lifetime
- 1988-02-05 EP EP88200205A patent/EP0281176B1/fr not_active Expired - Lifetime
- 1988-02-19 BR BR8800681A patent/BR8800681A/pt unknown
Also Published As
Publication number | Publication date |
---|---|
EP0281176A1 (fr) | 1988-09-07 |
BR8800681A (pt) | 1988-10-04 |
DE3705633A1 (de) | 1988-09-01 |
DE3865045D1 (de) | 1991-10-31 |
ES2025763T3 (es) | 1992-04-01 |
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