DE236244C - - Google Patents
Info
- Publication number
- DE236244C DE236244C DENDAT236244D DE236244DA DE236244C DE 236244 C DE236244 C DE 236244C DE NDAT236244 D DENDAT236244 D DE NDAT236244D DE 236244D A DE236244D A DE 236244DA DE 236244 C DE236244 C DE 236244C
- Authority
- DE
- Germany
- Prior art keywords
- aluminum
- etched
- metals
- coating
- processes
- 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.)
- Active
Links
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000003638 reducing agent Substances 0.000 claims description 2
- 150000007513 acids Chemical class 0.000 claims 1
- 238000005238 degreasing Methods 0.000 claims 1
- 125000005843 halogen group Chemical group 0.000 claims 1
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 238000009713 electroplating Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Description
KAISERLICHESIMPERIAL
■«4S; ·■·.■;,"« .ί■ «4S; · ■ ·. ■ ;, "« .ί
PATENTAMT.PATENT OFFICE.
Es sind verschiedene Verfahren bekannt geworden, Aluminium oder dessen Legierungen mit einem galvanischen Überzug zu versehen, jedoch haften diesen verschiedene wesentliche Mängel an, so daß sie in der Praxis keine weitgehende Verwendung gefunden haben.Various processes have become known, aluminum or its alloys to be provided with a galvanic coating, however, these adhere to various essentials Deficiencies, so that they have not found widespread use in practice.
Nach einigen Verfahren wird nämlich das Aluminium zum Vernichten seiner Oxydschicht vor dem Galvanisieren oder im Bade selbstAfter some processes the aluminum is used to destroy its oxide layer before electroplating or in the bath itself
ίο mittels Alkali geätzt. Dadurch wird aber das Aluminium so sehr angegriffen, daß der Überzug nicht haltbar ist und auch nicht, wie bei anderen galvanisierten Metallen, eine glänzende Oberfläche zeigt.ίο etched with alkali. But this will the aluminum is attacked so much that the coating is not durable and also not, as with other galvanized metals, showing a shiny surface.
Bei anderen Verfahren wird zwar das Aluminium nicht geätzt, sondern es wird in eine schwach alkalische Lösung gebracht, worin unter Zuhilfenahme des elektrischen Stromes nur die Oxydschicht vernichtet werden soll.In other processes, the aluminum is not etched, but is turned into a Weakly alkaline solution brought, in which with the aid of the electric current only the oxide layer should be destroyed.
Dies gelingt jedoch nur unvollkommen, denn es erweist sich als notwendig, das Aluminium nach Aufbringung des Überzuges zu erhitzen, um eine dauerhafte Verbindung der Metalle herbeizuführen.However, this succeeds only imperfectly, because it proves necessary to use the aluminum to be heated after application of the coating in order to permanently bond the metals bring about.
Gegenstand der vorliegenden Erfindung ist ein Verfahren zum Galvanisieren von Aluminium, bei welchem dasselbe weder stark geätzt wird, noch ein nachträgliches Erhitzen der Metalle notwendig ist.The present invention relates to a method for electroplating aluminum, in which the same is neither strongly etched, nor a subsequent heating of the metals necessary is.
Das neue Verfahren besteht darin, daß das Aluminium, welches in bekannter Weise gereinigt und entfettet ist, in ein erhitztes Bad eingetaucht wird, welches aus Säuren der Halogengruppe besteht und mit Reduktionsmitteln, wie Alkohol, welche die sonst sehr heftige Reaktion verzögern, versetzt ist. Nach kurzer Zeit wird das Aluminium aus dem Bade herausgenommen und in üblicher Weise in bekannten Bädern galvanisiert. Wie Versuche ergeben haben, erweisen sich die so erzeugten Überzüge als sehr haltbar und gut polierfähig.The new process is that the aluminum, which is cleaned in a known manner and degreased, is immersed in a heated bath made of acids Halogen group and with reducing agents, such as alcohol, which the otherwise very delay violent reaction. After a short time, the aluminum will be removed from the Bath removed and galvanized in the usual way in known baths. Like attempts have shown, the coatings produced in this way prove to be very durable and easy to polish.
Claims (1)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE236244C true DE236244C (en) |
Family
ID=495942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT236244D Active DE236244C (en) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE236244C (en) |
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0
- DE DENDAT236244D patent/DE236244C/de active Active
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