DE642285C - Process to increase the chemical resistance of light metals and their alloys - Google Patents
Process to increase the chemical resistance of light metals and their alloysInfo
- Publication number
- DE642285C DE642285C DEV31242D DEV0031242D DE642285C DE 642285 C DE642285 C DE 642285C DE V31242 D DEV31242 D DE V31242D DE V0031242 D DEV0031242 D DE V0031242D DE 642285 C DE642285 C DE 642285C
- Authority
- DE
- Germany
- Prior art keywords
- alloys
- light metals
- ammonia
- chemical resistance
- increase
- 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
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
- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
-
- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/10—Oxidising
- C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
Landscapes
- 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)
Description
Verfahren zur Erhöhung der chemischen Beständigkeit von Leichtmetallen und deren Legierungen Die bekannten Leichtmetalle und denen Legierungen haben die Eigenschaft, daß ihre Oberfläche unter dem Einfiluß des Luftsauerstoffes verhältnismäßig schnell !oxydiert. Der sich bildende sehr dünne; aber dichte Oxydfilm verleiht- ihnen eine gute Widerstandsfähigkeit gegen die Einwirkungen der Atmosphäne.Process for increasing the chemical resistance of light metals and their alloys The known light metals and those alloys have the Property that their surface is relatively exposed to atmospheric oxygen quickly! oxidized. The very thin one that forms; but gives a dense oxide film give them a good resistance to the effects of the atmosphere.
Es. lag nahe, für die Leichtmetalle; insbesondere für das am häufigsten verwendete Aluminium und dessen Legierungen, weitere Verwendungsmöglichkeiten dadurch zu schaffen, daß ihre natürliche Oxydschicht auf künstlichem Wege verstärkt wird. Diese Verfahren bewirken weiterhin eine Verbesserung der Haftfestigkeit von Farbanstrichen. Es sind daher zahlreiche MöglichlEeiten ausgebildet worden, die das Ziel. teils auf rein chemischem, teils auf elektroch emschem Wege zu erreichen suchen. Den bekannten Verfahren haften jedoch gewisse Nachteile an, weil entweder ihre Durchführung in der Praxis umständlich und teuer oder ihre Verwendbarkeit beschränkt ist, so daß sie nur für bestimmte Legierungsgruppen benutzt werden können.It. was obvious for the light metals; especially for the most common used aluminum and its alloys, further possible uses as a result to create that their natural oxide layer is reinforced in an artificial way. These methods also have the effect of improving the adhesion of paints. Numerous possibilities have therefore been devised which achieve the goal. part seek to achieve them purely chemically and partly electronically. The well-known However, there are certain disadvantages to processes because either they are carried out in in practice cumbersome and expensive or their usability is limited so that they can only be used for certain alloy groups.
Den zuletzt genannten Nachteil vermeidet ein an sich gleichfalls bekanntes Verfahren, wonach die zu schützenden Leichtrhctallgegenstände in einem völlig verschlossenen Raum der Einwirkung von Ammoniakgas ausgesetzt werden. Hierbei bildet sich nach etwa 8 bis io Tagen eine Oxydschicht aus, die selbst die empfindlichsten. kupferhaltigen Aluminium--legcrungen geen schädliche ehemische Einwirkungen, z. B. Seewasser, zu schütz"n vermag. Das Verfahren ist auf alle Leichtmetalle anwendbar. Es besitzt in der Ausführung nur den Nachteil, daß zu seiner Durchführung mindestens 8 Tage notwendig sind.The last-mentioned disadvantage is avoided by an equally known one Process, according to which the lightweight metal objects to be protected in a completely closed Room exposed to ammonia gas. This forms after about 8 to 10 days a layer of oxide, even the most sensitive. copper-containing Aluminum alloys avoid harmful previous effects, e.g. B. lake water, too The process can be applied to all light metals. It has in the execution only the disadvantage that to its execution at least 8 days are necessary.
Ferner ist bekannt, die Beständigkeit der Leichtmetalle durch Behandlung mit wäßriger Ammoniaklösungebenfalls unter Ausbildung einer Oxydschicht zu erhöhen. Dieses Verfahren scheidet aber für viele Zwecke, insbesondere bei den Konstruktionsteilen aus hochwertigen Leichtmetallegierungen, wie z. B. den vergütbaren Legierungen des Aluminiums hiit Zusätzen an Kupfer, Magnesium -und blanan, aus. Diese Legierungen, die z. B. im Flugzeugbau verwendet werden, sind bis zum äußersten in ihren guten Eigenschafteai ausgenutzt. Die wäßrigen Ammoniaklösungen tragen nun anfangs unter nicht unwesentlicher Gewichtsverminderung der Werkstücke die Oberfläche ab, und .erst im weiteren Verlauf der Reaktion kommt. diese Querschnitts-' verminderung, die naturgemäß eine Herabsetzung der Festigkeit zur Folge hat, zur Ruhe, und es bildet sich eine Oxydschicht, aus.It is also known that light metals are resistant to treatment with aqueous ammonia solution also to increase with the formation of an oxide layer. However, this method differs for many purposes, especially for the structural parts made of high quality light metal alloys, such as B. the heat treatable alloys of Aluminum consists of additions of copper, magnesium and white. These alloys, the z. B. used in aircraft, are to the utmost in their good Properties ai exploited. The aqueous ammonia solutions now carry under initially not insignificant weight reduction of the workpieces from the surface, and . only in the further course the reaction comes. this cross-sectional ' reduction, which naturally leads to a reduction in strength Rest, and an oxide layer forms.
Gegenstand der Erfindung ist nun eine Verbesserung des bekannten Verfahrens, die zu einer erheblichen Verkürzung der Behandlungsdauer führt, ohne daß die Festigkeit des behandelten Materials leidet. Eine solche Verbesserung war insbesondere deshalb dringlich geworden, weil zahlreiche Ldichtnietallvcrbraucher, die ihre Erzeugnisse mit Anstrichen versehen, eine bessere Vorbereitung des Haftgrundes forderten. Gerade die AinmoniakoxydatIon hat sich als gute Grundlage für Anstriche bewährt, nur die lange Vorbereitungsdauer war einer weiteren Verbreitung hinderlich.The subject of the invention is now an improvement of the known method, which leads to a considerable shortening of the treatment time without reducing the strength of the treated material suffers. Such an improvement was particularly therefore has become urgent because of the large number of users of their products provided with paint, demanded a better preparation of the primer. Just ammonia oxidation has proven to be a good basis for paints, only the long preparation time prevented further dissemination.
Die Erfindung besteht darin, daß die Leichtmetalle einei abwechselnden Behandlung zunächst mit Ammoniakgas und dann mit Ammoniaklösung unterworfen werden. Auf diese Weise werden die Vorteile des gasförmigen bzw. des in Wasser gelösten Ammoniaks ausgenutzt, ohne die Nachteile in Kauf nehmen zu müssen, die einer alleinigen Anwendung jeweils eines der beiden Verfahren anhaften würden. Behandelt man nämlich die zu schützenden Gegenstände zunächst kurzfristig mit Gas, so wird die natürliche Oxydhaut des Leichtmetalles so weit verstärkt, daß die nunmehr erfolgende Berührung der Gegenstände mit einer Ammoniaklösung keine Auflösung der Oberfläche mehr bewirken kann. Auf die mit Ammoniakgas kurzfristig vorbehandelte Oberfläche des Leichtmetalles wirkt vielmehr die Ammoniak-Lösung günstig im Sinne einer weiteren Verstärkung des Oxydtilms ein.The invention consists in the fact that the light metals are alternating Treatment first with ammonia gas and then with ammonia solution are subjected. In this way, the advantages of the gaseous or the dissolved in water Ammonia exploited without having to accept the disadvantages, which one alone Application of one of the two procedures would be adhered to. One treats namely the objects to be protected first briefly with gas, so it becomes natural Oxide skin of the light metal reinforced so far that the contact that now takes place of the objects with an ammonia solution no longer cause the surface to dissolve can. On the surface of the light metal that has been briefly pretreated with ammonia gas Rather, the ammonia solution acts favorably in terms of a further strengthening of the Oxydtilms a.
Zur Durchführung des Verfahrens werden daher die zu oxydierenden Gegenstände zunächst etwa i Tag in einem verschlossenen Raum , der Einwirkung von Ammoniakgas äusä@sctzt. Darauf erfolgt .ein Eintauchen in Ammoniaklösung -und nunmehr zivicckmäßig noch eine weitere Behandlung mit-Ammoniakgas während etwa weiterer 24 Stunden.The objects to be oxidized are therefore used to carry out the process initially about a day in a locked room, exposed to ammonia gas äusä @ sctzt. This is followed by immersion in ammonia solution -and now civilized yet another treatment with ammonia gas for about another 24 hours.
Untersuchungen haben ergeben, daß z. B. Aluminiumlegierungen, die nach diesem Verfahren etwa 2 bis 3 Tage behandelt wurden, den gleichen Schutz gegenüber chemischen Einwirkungen aufweisen wie solche, die mit Ammoniakgas allein mindestens 8 bis ioTage behandelt wurden.Studies have shown that z. B. aluminum alloys, the treated for about 2 to 3 days after this procedure, the same protection against have chemical effects such as those with ammonia gas alone at least 8 to ioTage were treated.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV31242D DE642285C (en) | 1934-11-02 | 1934-11-02 | Process to increase the chemical resistance of light metals and their alloys |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV31242D DE642285C (en) | 1934-11-02 | 1934-11-02 | Process to increase the chemical resistance of light metals and their alloys |
Publications (1)
Publication Number | Publication Date |
---|---|
DE642285C true DE642285C (en) | 1937-02-27 |
Family
ID=7586269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEV31242D Expired DE642285C (en) | 1934-11-02 | 1934-11-02 | Process to increase the chemical resistance of light metals and their alloys |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE642285C (en) |
-
1934
- 1934-11-02 DE DEV31242D patent/DE642285C/en not_active Expired
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