DE871239C - Process for the production of a dense, fine-grained coating on objects made of aluminum or aluminum alloys - Google Patents
Process for the production of a dense, fine-grained coating on objects made of aluminum or aluminum alloysInfo
- Publication number
- DE871239C DE871239C DEB15304A DEB0015304A DE871239C DE 871239 C DE871239 C DE 871239C DE B15304 A DEB15304 A DE B15304A DE B0015304 A DEB0015304 A DE B0015304A DE 871239 C DE871239 C DE 871239C
- Authority
- DE
- Germany
- Prior art keywords
- aluminum
- dense
- fine
- production
- objects made
- 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)
- Application Of Or Painting With Fluid Materials (AREA)
Description
Verfahren zur Herstellung eines dichten feinkörnigen Überzuges 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 sich bei der Lagerung an der Luft immer bildenden Aluminiumoxydfilm 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, fine-grained coating Articles made of aluminum or aluminum alloys The processes are numerous for treating the surfaces of objects made of aluminum or its alloys known, which usually improves the corrosion resistance and des Purpose of the appearance of these objects. In particular, electrochemical and chemical processes are enforced by which a Oxide layer is formed, which is always formed when stored in the air Aluminum oxide film exceeds in thickness and thus largely the. corrosion which prevents aluminum objects. For the chemical process have become particularly Aqueous solutions of alkaline carbonates have been found to be effective, since these processes are effective can be carried out easily and are therefore very economical. By Treatment with alkaline carbonates produced oxide coatings on aluminum objects but also have a number of disadvantages, for example lower hardness, Adhesion strength and homogeneity compared to those produced by electrochemical means Coatings.
Es wurde nun gefunden, daß man auf Gegenständen aus Aluminium oder Aluminiumlegierungen einen dichten feinkörnigen Oxydüberzug erhält, wenn man diese mit einer wäßrigen Lösung von alkalisch reagierenden Carbonaten, beispielsweise Natrium- oder Ammoniumcarbonat; und' gegebenen, falls Alkalichromaten behandelt, die wasserlösliche Polymerisate mit Amino-, Amid- oder Carboxylgruppen enthält. Als wasserlösliche Polymerisate können beispielsweise Polyacrylsäüre und: deren -Alkalisalze,- Polyyinylpzrrolidon u. dgl. verwendet werden.It has now been found that on objects made of aluminum or Aluminum alloys get a dense, fine-grained oxide coating when you use them with an aqueous solution of alkaline carbonates, for example Sodium- or ammonium carbonate; and 'where appropriate, if treated with alkali chromates, the water-soluble ones Contains polymers with amino, amide or carboxyl groups. As water soluble Polymers can, for example, polyacrylic acid and: their alkali salts, - polyynylpyrrolidone and the like can be used.
Zur Durchführung des Verfahrens behandelt man die Aluminiumgegenstände zweckmäßig bei hoher Temperatur mit dem alkalischen Lösungsmittel; spült dann die entnommenen Gegenstände gründlich ab -und trocknet sie bei Raumtemperatur. Die so behandelten -Gegenstände können noch nach bekannten Verfahren, z. B. durch. Erwärmen mit, fetten Ölen, nachbehandelt werden. -Beispiel _.The aluminum objects are treated to carry out the process expediently at high temperature with the alkaline solvent; then rinses the removed objects thoroughly and dry them at room temperature. The so treated objects can still be processed by known methods, e.g. B. by. Heat be treated with, fatty oils. -Example _.
Entfettete Gegenstände aus ' Aluminium oder Aluminiumlegierungen werden 30 Minuten bei' 85 bis g5° mit einer Lösung aus 6 Teilen Ammoniumcarbonat, 0,3 Teilen polyacrylsaurem Natrium, o,6 bis 1,a Teilen Kaliumbichromat und 4.0o bis 5oo Teilen Wasser behandelt. Nach der Entnahme der Gegenstände aus er Lösung werden sie gründlich mit heißem Wasser gewaschen und bei Raum-.'tezbperatur getrocknet. Sie haben einen feinkärriigen dichten Überzug von graugrüner Farbe und sehr gutem Glanz erhalten.Degreased objects made of aluminum or aluminum alloys are treated for 30 minutes at 85 to g5 ° with a solution of 6 parts of ammonium carbonate, 0.3 parts of sodium polyacrylate, 0.6 to 1.0 parts of potassium dichromate and 40o to 500 parts of water. After the objects have been removed from the solution, they are washed thoroughly with hot water and dried at room temperature. They have received a fine-grain, dense coating of gray-green color and very good gloss.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB15304A DE871239C (en) | 1951-06-08 | 1951-06-08 | Process for the production of a dense, fine-grained coating on objects made of aluminum or aluminum alloys |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB15304A DE871239C (en) | 1951-06-08 | 1951-06-08 | Process for the production of a dense, fine-grained coating on objects made of aluminum or aluminum alloys |
Publications (1)
Publication Number | Publication Date |
---|---|
DE871239C true DE871239C (en) | 1953-03-19 |
Family
ID=6958376
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB15304A Expired DE871239C (en) | 1951-06-08 | 1951-06-08 | Process for the production of a dense, fine-grained coating on objects made of aluminum or aluminum alloys |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE871239C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3042558A (en) * | 1959-05-28 | 1962-07-03 | Aluminum Res Corp | Cold forming lubricant and method of applying same |
EP0016298A1 (en) * | 1979-01-22 | 1980-10-01 | Ball Corporation | A solution for imparting tarnish resistance on aluminium surfaces and method for applying it |
-
1951
- 1951-06-08 DE DEB15304A patent/DE871239C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3042558A (en) * | 1959-05-28 | 1962-07-03 | Aluminum Res Corp | Cold forming lubricant and method of applying same |
EP0016298A1 (en) * | 1979-01-22 | 1980-10-01 | Ball Corporation | A solution for imparting tarnish resistance on aluminium surfaces and method for applying it |
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