DE961587C - Process for the production of a dense oxide coating on objects made of aluminum or aluminum alloys - Google Patents
Process for the production of a dense oxide coating on objects made of aluminum or aluminum alloysInfo
- Publication number
- DE961587C DE961587C DEB15581A DEB0015581A DE961587C DE 961587 C DE961587 C DE 961587C DE B15581 A DEB15581 A DE B15581A DE B0015581 A DEB0015581 A DE B0015581A DE 961587 C DE961587 C DE 961587C
- Authority
- DE
- Germany
- Prior art keywords
- aluminum
- production
- objects made
- oxide coating
- dense oxide
- 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
- 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
- C23C22/05—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 using aqueous solutions
- C23C22/60—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 using aqueous solutions using alkaline aqueous solutions with pH greater than 8
- C23C22/66—Treatment of aluminium or alloys based thereon
- C23C22/67—Treatment of aluminium or alloys based thereon with solutions containing hexavalent chromium
-
- 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
- C23C22/05—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 using aqueous solutions
- C23C22/60—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 using aqueous solutions using alkaline aqueous solutions with pH greater than 8
- C23C22/66—Treatment of aluminium or alloys based thereon
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)
Description
Verfahren zur Herstellung eines dichten Oxydüberzuges auf Gegenständen aus Aluminium oder Aluminiumlegierungen Es sind zahlreiche Verfahren zur Behandlung der Oberflächen von Gegenständen aus Aluminium oder dessen Legierungen bekannt, die in der Regel eine Verbesserung der Korrosionsbeständigkeit und des Aussehens dieser Gegenstände bezwecken. Insbesondere haben sich elektrochemische und chemische Verfahren durchgesetzt, durch welche auf der Aluminiumoberfläche eine Oxydschicht ausgebildet wird, die den sieh bei der Lagerung an der Luft immer bildenden Aluminilumoxydfilm in der Dicke übertrifft und dadurch weitgehend die Korrosion der Aluminiumgegenstände verhindert. Für die chemischen Verfahren haben sich besonders wäßrige Lösungen von alkalisch reagierenden Carbonaten bewährt, da sich diese Verfahren einfach durchführen lassen und infolgedessen sehr wirtschaftlich sind. Die durch Behandlung mit alkalisch reagierenden Carbonaten erzeugten Oxydüberzüge auf Aluminiumgegenständen weisen aber auch eine Reihe von Nachteilen auf, beispielsweise geringere Härte, Haftfestigkeit und Homogenität gegenüber den auf elektrochemischem Wege hergestellten Überzügen.Process for the production of a dense oxide coating on objects Made of aluminum or aluminum alloys There are numerous methods of treatment the surfaces of objects made of aluminum or its alloys known, which usually improves corrosion resistance and appearance of these objects. In particular, electrochemical and chemical Process enforced by which an oxide layer on the aluminum surface which is the aluminum oxide film which is always formed when stored in air exceeds in thickness and thereby largely the corrosion of the aluminum objects prevented. Aqueous solutions of Alkaline carbonates have been tried and tested because these processes are easy to carry out and as a result are very economical. The by treatment with alkaline reactive carbonates have generated oxide coatings on aluminum objects but also a number of disadvantages, for example lower hardness, adhesive strength and homogeneity with respect to the coatings produced by electrochemical means.
Zum Stand der Technik gehört ein Verfahren, dessen Ziel es ist, die geschilderten Nachteile der chemischen Oberflächenbehandlung von Aluminium mit Alkalicarbonaten zu beseitigen. Nach ,diesem Verfahren wird der üblichen Behandlungslösung Polyvinylkalkohol zugegeben. Die so erzeugten Überzüge sollen fester haften und gegen mechanische Beanspruchung widerstandsfähiger sein. Der glatten Durchführung des Verfahrens ist jedoch hinderlich, daß Polyvinylalkohol enthaltende Lösungen selbst bei geringer Konzentration des Polyvinylalkohols stark zur - Schaumbildung neigen. Weiterhin macht sich störend bemerkbar, daß sich aus der Polyvinylalkohol enthaltenden Lösung geringe Mengen P@olyvinylalkohol abscheiden. Er setzt sich auf der Aluminiumoberfläche fest und beeinträchtigt infolgedessen die Homogenität des Oxydüberzuges. Es entstehen Fehlstellen in der Oberflächenschicht, die sich besonders nachteilig bemerkbar machen, wenn die behandelten Gegenstände mit wasserlöslichenFarbstoffen gefärbt werden; hinzu kommt, daß die runter Zusatz von Polyvinylalkohol erzeugte Oxydschicht an sich schon eine geringere Affinität zu Farbstoffen hat.The prior art includes a method, the aim of which is the outlined disadvantages of the chemical surface treatment of aluminum with alkali carbonates to eliminate. After this procedure, the usual treatment solution becomes polyvinyl alcohol admitted. The coatings produced in this way should adhere more firmly and against mechanical Be more resistant to stress. The smooth execution of the procedure is However obstructive that polyvinyl alcohol-containing solutions themselves If the concentration of polyvinyl alcohol is low, there is a strong tendency to foam formation. Furthermore, it is noticeable that the polyvinyl alcohol-containing Separate small amounts of polyvinyl alcohol from the solution. It sits on the aluminum surface solid and consequently affects the homogeneity of the oxide coating. It arise Defects in the surface layer, which are particularly noticeable, when the treated articles are colored with water-soluble dyes; In addition, the oxide layer produced by the addition of polyvinyl alcohol is added already has a lower affinity for dyes.
Es wurde nun, gefunden, daß sich bessere Oxydschichten auf Gegenständen aus Aluminium oder Aluminiumlegierungen durch chemische Oberflächenbehandlung mit wäßri@gen Behandlungsbädern, die alkalisch reagierende Carbonate, beispielsweise Natrium- oder Ammoni,cumcarbonat, und gegebenenfalls Alkalichromate enthalten, bei gleicher einfacher Verfahrensweise erzeugen lassen, wenn man den Behandlungsbädern. wasserlösliche, monomere ungesättigte Alkohole zusetzt.It has now been found that there are better layers of oxide on objects made of aluminum or aluminum alloys by chemical surface treatment with Aqueous treatment baths containing alkaline carbonates, for example Sodium or ammonium carbonate, and optionally alkali chromates, contain The same simple procedure can be produced when using the treatment baths. adds water-soluble, monomeric unsaturated alcohols.
Geeignete ungesättigte Alkohole sind z. B. Acetylenalkohole, wie Propargylalkohol, Butin-(2)-diol-(z, 4) oder Hexin-(3)-diol-(2, 5), ferner Olefinalkohole, wie Buten-(2)-diol-(r, 4) oder Hexen- (3)-diol-(2,5).Suitable unsaturated alcohols are, for. B. acetylene alcohols, such as propargyl alcohol, Butyne (2) diol (z, 4) or hexyne (3) diol (2, 5), also olefin alcohols, such as butene (2) diol (r, 4) or hexen- (3) -diol- (2.5).
Die Behandlung der Aluminiumgegenstände wird zweckmäßig in der Wärme vorgenommen. Man erhält dichte, homogene Oxydüberzüge mit größerer Härte, besserer Haftfestigkeit und erhöhtem Glanz gegenüber dien ohne Zusatz von ungesättigten Alkoholen mit alkalisch reagierenden Carbonatl.ösungen allein erzielbaren Überzügen. Mit wasserlöslichen Farbstoffen lassen sich auf diesen Oxyd'-überzügen volle rund tiefe, auf der ganzen Fläche einheitliche Farbtöne erzielen. Man kann die nach diesem Verfahren hergestellten Oxydüberzüge auch mit weiteren Schutzschichten, beispielsweise Lacküberzügen, überdecken. Beispiel Entfettete Gegenstände aus Aluminium bzw. aus Aluminiumlegierungen werden 30 Minuten bei So bis 95° mit einer Lösung aus 5 Teilen Kalium-oder Natriumcarbonat, 5 Teilen Butin-(2)-diol-(r, 4) und o;5 bis r Teil Kaliumbichromat und 25o Teilen Wasser behandelt. Darauf werden die oberflächlich oxydierten Gegenstände mit heißem Wasser gründlich gewaschen und- bei gewöhnlicher Temperatur getrocknet. Sie haben durch diese Behandlung einen sehr -dichten und glänzenden graugrünen Oxydüberzug erhalten.The treatment of the aluminum objects is expediently carried out in the heat. Dense, homogeneous oxide coatings are obtained with greater hardness, better adhesive strength and increased gloss compared to coatings that can be achieved with alkaline carbonate solutions alone without the addition of unsaturated alcohols. With water-soluble dyes, these Oxyd'-coatings can be used to achieve full, round, deep colors that are uniform over the entire surface. The oxide coatings produced by this process can also be covered with further protective layers, for example lacquer coatings. Example Degreased objects made of aluminum or aluminum alloys are treated with a solution of 5 parts of potassium or sodium carbonate, 5 parts of butyne (2) diol (r, 4) and o; 5 to r part for 30 minutes at 50 ° to 95 ° Treated potassium dichromate and 250 parts of water. The superficially oxidized objects are then thoroughly washed with hot water and dried at ordinary temperature. This treatment gave you a very dense and shiny gray-green oxide coating.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB15581A DE961587C (en) | 1951-06-28 | 1951-06-28 | Process for the production of a dense oxide coating on objects made of aluminum or aluminum alloys |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB15581A DE961587C (en) | 1951-06-28 | 1951-06-28 | Process for the production of a dense oxide coating on objects made of aluminum or aluminum alloys |
Publications (1)
Publication Number | Publication Date |
---|---|
DE961587C true DE961587C (en) | 1957-04-11 |
Family
ID=6958508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB15581A Expired DE961587C (en) | 1951-06-28 | 1951-06-28 | Process for the production of a dense oxide coating on objects made of aluminum or aluminum alloys |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE961587C (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE810097C (en) * | 1945-02-15 | 1951-09-03 | Aluminum Co Of America | Process for the production of an oxide coating on aluminum |
-
1951
- 1951-06-28 DE DEB15581A patent/DE961587C/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE810097C (en) * | 1945-02-15 | 1951-09-03 | Aluminum Co Of America | Process for the production of an oxide coating on aluminum |
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