DE764419C - Process for producing firmly adhering metal coatings on aluminum and aluminum alloys - Google Patents

Process for producing firmly adhering metal coatings on aluminum and aluminum alloys

Info

Publication number
DE764419C
DE764419C DEP76364D DEP0076364D DE764419C DE 764419 C DE764419 C DE 764419C DE P76364 D DEP76364 D DE P76364D DE P0076364 D DEP0076364 D DE P0076364D DE 764419 C DE764419 C DE 764419C
Authority
DE
Germany
Prior art keywords
aluminum
metal
fluoride
metal coatings
firmly adhering
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
Application number
DEP76364D
Other languages
German (de)
Inventor
Leonhard Perner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DEP76364D priority Critical patent/DE764419C/en
Application granted granted Critical
Publication of DE764419C publication Critical patent/DE764419C/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/42—Pretreatment of metallic surfaces to be electroplated of light metals
    • C25D5/44—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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/31—Coating with metals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Electroplating Methods And Accessories (AREA)

Description

Die Aufbringung von Metallüberzügen auf Aluminiumgegenständien wird in der Hauptsache elektrolytisch vorgenommen. Es sind auch einige Tauchverfahren bekannt, die die Abscheidung von Metallen auf Aluminiumgegenständen vorsehen. Alle diese Tauchverfahren haben den Zweck, durch einen hauchdünnen. Metallniederschlag die anschließende elektrolytische Plattierung zu ermöglichen. Es gelingt nach diesen Verfahren nicht, vollkommen dichte -und festhaftende Metallschichten aufzubringen. Die Aufbringung dieser hauchdünnen Metallüberzüge muß z. T. in sehr heißen Metallsalzlöstmgen vorgenommen werden, was bei vorliegendem Verfahren nicht nötig ist.The application of metal coatings to aluminum objects is mainly used made electrolytically. There are also some known dipping methods that use the Provide for the deposition of metals on aluminum objects. All of these dipping procedures have the purpose of being through a gossamer. Metal precipitation the subsequent to enable electrolytic plating. It does not succeed after this procedure, completely to apply dense and firmly adhering metal layers. The application this wafer-thin metal coatings must z. T. made in very hot metal salt solutions which is not necessary with the present method.

Nach einem in Amerika bekanntgewordenen Verfahren werden Aluminiumgegenstände mit schwachen Fluoridlösungen behandelt, wodurch eine mehr oder weniger dunkle Farbtönung auf diesen Gegenständen erreicht wird. Festhaftende metallische Überzüge können dagegen mit Hilfe dieser Lösungen nicht erzeugt werden.Aluminum objects are made according to a process that has become known in America Treated with weak fluoride solutions, creating a more or less dark color tint is achieved on these objects. Firmly adhering metallic coatings on the other hand, cannot be generated with the help of these solutions.

Gegenstand der vorliegenden Erfindung ist die Aufbringung einer Metallschicht durch einen einfachen Tauchprozeß. Die Metallschicht ist von dichter und sehr gut polier-The present invention is the application of a metal layer by a simple immersion process. The metal layer is dense and very well polished.

fähiger Stärke, die nicht blasig ist, nicht abblättert und daher korrosionsbeständig ist.capable starch that is not blistered, does not flake off and is therefore resistant to corrosion.

Nach der Erfindung werden bei der Aufbringung einer dieser Metallschichten Lösungen von Siliciumfluorid sowie Borfluoridverbindungen aller Metalle, die edler als Aluminium sind, außer Blei, verwendet.According to the invention, when one of these metal layers is applied, solutions of silicon fluoride and boron fluoride compounds all metals that are nobler than aluminum, except lead, are used.

[Jm einerseits die Hydrolyse zu unterbinden sowie die Abscheidung des betreffenden[Jm on the one hand to prevent the hydrolysis and the deposition of the relevant

ίο Metalls zu begünstigen, werden Zusätze eines Silicobor- oder Fluoborates eines anderen Schwermetalls der Lösung zugesetzt.ίο favor metal additions to one Silicobor- or fluoborate of another heavy metal added to the solution.

Es wurde nun gefunden, daß zur Erreichung einer fein kristallinen Metallstruktur den Fluoridlösungen gewisse Verbindungen zugesetzt werden müssen, die an sich als Zusatz zu solchen Lösungen, aus denen Metalle elektrolytisch abgeschieden werden, bekannt sind. Jedoch ist bisher ein derartiger Zusatz zu Lösungen, aus denen Metalle ohne elektrischen Strom abgeschieden werden, nicht vorgeschlagen worden. In den Lösungen entstehen wahrscheinlich z. B. metallorganische Verbindungen, denen die Ausbildung des feinkörnigen glänzenden Metallniederschlages zuzuschreiben ist. Als Zusätze zu den Fluoridverbindungen werden organische sowie anorganische Verbindungen bzw. kolloidbildende Stoffe, z. B. Gelatose, Gelatine, Albumosen, Dextrin, instesondere Sulfitlauge, Amine, Harnstoff, Sulfoharnstoff u. dgl., zugesetzt. Die Aufbringung einer dieser Metallschichten kann in der Wärme oder bei Zimmertemperatur vorgenommen werden.It has now been found that to achieve a finely crystalline metal structure Certain compounds must be added to the fluoride solutions, which are per se as additives such solutions from which metals are electrodeposited are known are. However, so far, such an addition to solutions that make metals without electrical Electricity to be deposited has not been suggested. In the solutions arise probably z. B. organometallic compounds, which the formation of the fine-grained is attributable to shiny metal deposit. As additives to the fluoride compounds organic and inorganic compounds or colloid-forming substances such. B. gelatose, gelatine, albumoses, Dextrin, special sulphite liquor, amines, urea, sulphurea and the like are added. The application of one of these metal layers can be done in the heat or at room temperature be made.

Beispiel 1example 1

Herstellung einer wäßrigen Cadmiumsilicofluoridlösung durch Auflösen von 250 g CdSiF6 in 1000 ecm Wasser. Diese Lösungkann als solche oder verdünnt mit Zusätzen der obenerwähnten Kolloide im Verhältnis 2 bis 5:1000 der Gesamtflüssigkeit ange-Preparation of an aqueous cadmium silicofluoride solution by dissolving 250 g of CdSiF 6 in 1000 ecm of water. This solution can be used as such or diluted with additions of the colloids mentioned above in a ratio of 2 to 5: 1000 of the total liquid.

wandt werden. In diese Lösung wird das zu behandelnde Werkstück 5 bis 10 Minuten bei Zimmertemperatur getaucht.be turned. The workpiece to be treated is in this solution for 5 to 10 minutes Submerged in room temperature.

Beispiel 2Example 2

Herstellung einer wäßrigen Zinkborfluoridlösung durch Auflösen von 50 g ZnO in ecm Borfluorwasserstoffsäure, doppelt gereinigt, die mit 200 ecm Wasser verdünnt ist. Xach dem Auflösen werden weitere 600 ecm Wasser zugesetzt. Diese Lösung kann mit oder ohne Zusatz eines Schwermetallfluorids sowie mit einem Kolloidzusatz von 5 :1000 der Gesamtflüssigkeit benutzt werden. Die Lösung findet bei etwa 40" C Anwendung.Preparation of an aqueous zinc boron fluoride solution by dissolving 50 g of ZnO in ecm hydrofluoric acid, double purified, diluted with 200 ecm water. X After dissolving, another 600 ecm Water added. This solution can be used with or without the addition of a heavy metal fluoride as well as with a colloid addition of 5: 1000 of the total liquid. the Solution applies at around 40 "C.

Claims (2)

Patentansprüche:Patent claims: i. Verfahren zur Erzeugung festhaften-i. Method of producing adherent der Metallüberzüge von edleren Metallen als Aluminium, außer Blei, auf Gegenständen aus Aluminium und Aluminiumlegierungen, dadurch gekennzeichnet, daß die Gegenstände in einer wäßrigen Lösung von Metallfluoridverbindungen. insbesondere Metallsiliciumfluorid oder Metallborfluorid, gegebenenfalls mit Zusätzen von Fluosilicat, Fluoborat der Alkali-, Leicht- und Schwermetalle getaucht werden.the metal coatings of more precious metals than aluminum, except lead, on objects made of aluminum and aluminum alloys, characterized in that the objects are in an aqueous solution of metal fluoride compounds. in particular metal silicon fluoride or metal boron fluoride, optionally with additions of fluosilicate, fluoborate of the alkali, light and heavy metals are immersed. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß den zur Verwendung kommenden Metallfluoridlösungen organische oder anorganische Kolloide bzw. kolloidbildende Stoffe, z. B. Gelatine, Gelatose, Albumosen, Dextrin u. dgl., insbesondere Sulfitlauge, Amine und Harnstoff (Sulfoharnstoff). zugesetzt werden. 2. The method according to claim 1, characterized in that the coming to be used metal fluoride solutions organic or inorganic colloids or colloid-forming substances, for. B. gelatin, gelatose, albumoses, dextrin and the like, in particular sulfite liquor, amines and urea (sulfourea). can be added. Zur Abgrenzung des Erfindungsgegenstands vom Stand der Technik ist im Erteilungsverfahren folgende Druckschrift in Betracht gezogen worden:To differentiate the subject matter of the invention from the state of the art, the granting process is in progress the following publication has been considered: Deutsche Patentschrift Xr. 480 720.German patent specification Xr. 480 720. © 29491.52© 29491.52
DEP76364D 1937-12-06 1937-12-07 Process for producing firmly adhering metal coatings on aluminum and aluminum alloys Expired DE764419C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEP76364D DE764419C (en) 1937-12-06 1937-12-07 Process for producing firmly adhering metal coatings on aluminum and aluminum alloys

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE846985X 1937-12-06
DEP76364D DE764419C (en) 1937-12-06 1937-12-07 Process for producing firmly adhering metal coatings on aluminum and aluminum alloys

Publications (1)

Publication Number Publication Date
DE764419C true DE764419C (en) 1952-01-31

Family

ID=6775201

Family Applications (2)

Application Number Title Priority Date Filing Date
DEP76364D Expired DE764419C (en) 1937-12-06 1937-12-07 Process for producing firmly adhering metal coatings on aluminum and aluminum alloys
DEP312D Expired DE871393C (en) 1937-12-06 1942-06-27 Process for the production of firmly adhering metal coatings on objects made of aluminum and aluminum alloys

Family Applications After (1)

Application Number Title Priority Date Filing Date
DEP312D Expired DE871393C (en) 1937-12-06 1942-06-27 Process for the production of firmly adhering metal coatings on objects made of aluminum and aluminum alloys

Country Status (2)

Country Link
DE (2) DE764419C (en)
FR (2) FR846985A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3108006A (en) * 1959-07-13 1963-10-22 M & T Chemicals Inc Plating on aluminum

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE480720C (en) * 1926-02-10 1929-08-08 Aladar Pacz Dr Process for providing metal that consists predominantly or entirely of aluminum with an irregularly speckled coating

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE480720C (en) * 1926-02-10 1929-08-08 Aladar Pacz Dr Process for providing metal that consists predominantly or entirely of aluminum with an irregularly speckled coating

Also Published As

Publication number Publication date
FR53153E (en) 1945-09-20
FR846985A (en) 1939-09-28
DE871393C (en) 1953-03-23

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