DE816937C - Process for protecting the surface of chemically and / or electrolytically treated objects made of aluminum or aluminum alloys between two treatment stages - Google Patents
Process for protecting the surface of chemically and / or electrolytically treated objects made of aluminum or aluminum alloys between two treatment stagesInfo
- Publication number
- DE816937C DE816937C DEV271A DEV0000271A DE816937C DE 816937 C DE816937 C DE 816937C DE V271 A DEV271 A DE V271A DE V0000271 A DEV0000271 A DE V0000271A DE 816937 C DE816937 C DE 816937C
- Authority
- DE
- Germany
- Prior art keywords
- treatment stages
- aluminum
- acid
- objects
- chemically
- 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
Links
- 238000000034 method Methods 0.000 title claims description 7
- 229910000838 Al alloy Inorganic materials 0.000 title claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 4
- 229910052782 aluminium Inorganic materials 0.000 title claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 2
- 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 claims description 2
- 230000009931 harmful effect Effects 0.000 claims description 2
- PEYVWSJAZONVQK-UHFFFAOYSA-N hydroperoxy(oxo)borane Chemical compound OOB=O PEYVWSJAZONVQK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 239000011572 manganese Substances 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims 1
- 239000007864 aqueous solution Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000000126 substance Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- PXLIDIMHPNPGMH-UHFFFAOYSA-N sodium chromate Chemical compound [Na+].[Na+].[O-][Cr]([O-])(=O)=O PXLIDIMHPNPGMH-UHFFFAOYSA-N 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Description
Verfahren zum Schutz der Oberfläche von chemisch und/oder elektrolytisch behandelten Gegenständen aus Aluminium oder Aluminiumlegierungen zwischen zwei Behandlungsstufen Gegenstände aus Aluminium oder Aluminiumlegierungen werden vielfach in mehreren Stufen einer Oberflächenbehandlung durch chemisches und/ oder elektrolytisches Glänzen, gegebenenfalls mit nachfolgender anodischer Oxydation, unterworfen. Es ist vielfach nicht möglich, die verschiedenen Behandlungsstufen unmittelbar aneinander anschließen zu lassen; daher müssen die Gegenstände zwischen zwei aufeinanderfolgenden Behandlungsstufen zuweilen kürzer oder länger aufbewahrt werden. Beim Aufbewahren der in normalem Leitungswasser gespülten Gegenstände an der Luft oder aber unter Wasser treten durch irgendwelche chemischen Einflüsse, die durch das Wasser selbst oder durch Reste der Beizlösung verursacht werden, mattweiße Flekken auf, die bei der Weiterbehandlung, z. B. durch anodische Oxydation, besonders deutlich in Erscheinung treten. .Process for protecting the surface from chemical and / or electrolytic treated objects made of aluminum or aluminum alloys between two treatment stages Objects made of aluminum or aluminum alloys are often used in several Stages of a surface treatment by chemical and / or electrolytic polishing, if necessary with subsequent anodic oxidation. It is multiple it is not possible to directly connect the different treatment stages to one another allow; therefore the objects have to be between two successive treatment stages sometimes be kept for a shorter or longer period. When storing the in normal Objects rinsed with tap water in the air or under water pass through any chemical influences caused by the water itself or by residues caused by the pickling solution, matt white stains appear during further treatment, z. B. by anodic oxidation, appear particularly clearly. .
Man hat versucht, diese Erscheinungen dadurch zu vermeiden, daß man die Gegenstände in destilliertem Wasser nachgespült und schnell, z. B. durch Warmluft, getrocknet hat. Abgesehen von der Umständlichkeit und Kostspieligkeit dieses Verfahrens tritt die gewünschte Wirkung dabei in den meisten Fällen nicht ein.Attempts have been made to avoid these phenomena by the items rinsed in distilled water and quickly, z. B. by warm air, has dried. Apart from the inconvenience and cost of this process the desired effect does not occur in most cases.
Erfindungsgemäß wird diese Erscheinung dadurch vermieden, daß man die Gegenstände zwischen zwei Behandlungsstufen, gegebenenfalls nach Abspülen in fließendem Wasser, in Wasser einbringt, das einen Zusatz erhält, der eine passivierende Wirkung auf die Oberfläche ausübt. Als solche Zusätze, die vorzugsweise in geringen Mengen gemacht werden sollen, eignen sich Salze der Chromsäure, Übermangansäure, Perschwefelsäure, Salpetersäure, Perchlorsäure, Perborsäure, vorzugsweise solche mit Alkalien oder Erdalkalien.According to the invention, this phenomenon is avoided in that one the objects between two treatment stages, if necessary after rinsing in running water, in water that receives an additive that has a passivating effect Has an effect on the surface. As such additives, preferably in small amounts Quantities are made salts of chromic acid are suitable, Super-manganese acid, persulphuric acid, nitric acid, perchloric acid, perboric acid, preferably those with alkalis or alkaline earths.
Es zeigte sich, daB die Gegenstände nicht die ganze Zeit über in dieser Lösung aufbewahrt werden müssen, sondern daB bereits eine Tauchdauer von " io Minuten genügt, um die Gegenstände vor weiteren schädlichen Einwirkungen bis zur Weiterbehandlung zu schützen. Es ist jedoch auch möglich, die Gegenstände tagelang im Wasser aufzubewahren, ohne daB eine Oberflächenveränderung eintritt. Besonders gute Erfahrungen wurden mit einer 2%igen Natriumchromatlösung gemacht.It turned out that the objects were not in this all the time Solution must be kept, but that an immersion time of "10 minutes suffices to protect the objects from further harmful effects until further treatment to protect. However, it is also possible to keep the items in the water for days, without any surface change occurring. The experiences were particularly good made with a 2% sodium chromate solution.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEV271A DE816937C (en) | 1949-12-20 | 1949-12-20 | Process for protecting the surface of chemically and / or electrolytically treated objects made of aluminum or aluminum alloys between two treatment stages |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEV271A DE816937C (en) | 1949-12-20 | 1949-12-20 | Process for protecting the surface of chemically and / or electrolytically treated objects made of aluminum or aluminum alloys between two treatment stages |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE816937C true DE816937C (en) | 1951-10-15 |
Family
ID=7569004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEV271A Expired DE816937C (en) | 1949-12-20 | 1949-12-20 | Process for protecting the surface of chemically and / or electrolytically treated objects made of aluminum or aluminum alloys between two treatment stages |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE816937C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1149965B (en) * | 1957-06-07 | 1963-06-06 | Ver Leichtmetallwerke Gmbh | Process for improving the adhesive strength of organic substances on aluminum or aluminum alloys |
-
1949
- 1949-12-20 DE DEV271A patent/DE816937C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1149965B (en) * | 1957-06-07 | 1963-06-06 | Ver Leichtmetallwerke Gmbh | Process for improving the adhesive strength of organic substances on aluminum or aluminum alloys |
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