DE645912C - Process for producing electrically insulating layers on copper conductors - Google Patents
Process for producing electrically insulating layers on copper conductorsInfo
- Publication number
- DE645912C DE645912C DEM134438D DEM0134438D DE645912C DE 645912 C DE645912 C DE 645912C DE M134438 D DEM134438 D DE M134438D DE M0134438 D DEM0134438 D DE M0134438D DE 645912 C DE645912 C DE 645912C
- Authority
- DE
- Germany
- Prior art keywords
- insulating layers
- electrically insulating
- copper conductors
- producing electrically
- copper
- 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
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/36—Phosphatising
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/16—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Processes Specially Adapted For Manufacturing Cables (AREA)
- Chemical Treatment Of Metals (AREA)
Description
Die Erfindung· betrifft ein Verfahren zur Erzeugung elektrisch isolierender Schichten auf Kupferleitem und besteht darin, daß die Teile anodisch in der Lösung eines sauren Alkaliphosphates behandelt werden, der Chloride oder Nitrate, ein Ammoniumsalz sowie ein Oxydationsmittel, wie z. B. Alkalichromat, zugesetzt sind. Die nach, diesem Verfahren erhaltenen Isolierschichten eignen sichThe invention relates to a method for producing electrically insulating layers on copper conductors and consists in the fact that the parts are anodic in the solution of an acidic Alkali phosphates are treated, the chlorides or nitrates, an ammonium salt as well an oxidizing agent, such as. B. alkali chromate, are added. The after, this procedure obtained insulating layers are suitable
z. B. in den Fällen, wo der Leiter höheren Temperaturen ausgesetzt wird, die den bekannten Isolierschichten auf Basis von Textilfasern oder Lackschichten gefährlich werden. Es sind zwar bereits Verfahren zur Herstellung wärmebeständiger Isolierschichten bekannt, z. B. Umspinnung des Leiters mit Asbestfasern. Vor diesen Verfahren hat das neue Verfahren den Vorteil, dünne Schichten zu liefern.z. B. in cases where the conductor is exposed to higher temperatures, the known Insulating layers based on textile fibers or layers of lacquer become dangerous. Processes for the production of heat-resistant insulating layers are already known, z. B. Wrapping of the conductor with asbestos fibers. Before this process, the new process has the advantage of using thin layers to deliver.
Für Aluminium sind schon lange Verfahren bekannt, die es ermöglichen, auf dem Metall gut isolierende Schichten von sehr geringer Dicke und bedeutender Wärmebeständigkeit zu erzeugen. Es sind das die bekannten elektrolytischen Oxydationsverfahren, die darin bestehen, daß das Aluminium in einem Elektrolyten anodisch behandelt wird.For aluminum, processes have been known for a long time that make it possible to work on the metal Well-insulating layers of very small thickness and significant heat resistance to create. These are the well-known electrolytic oxidation processes that are involved insist that the aluminum is anodized in an electrolyte.
Nach dem neuen Verfahren ist es möglich, auch auf Kupfer durch anodische Behandlung Schichten mit ähnlichen Eigenschaften zu erzielen. Es hat sich nämlich gezeigt, daß besonders wäßrige Lösungen sekundärer Alkaliphosphate als Elektrolyt geeignet sind, indem sich bei anodischer Behandlung basisches Cupriphosphat bildet, das unter günstigen Arbeitsbedingungen das Kupfer als dünne, harte und gleichmäßige Schicht überzieht, die eine gute Isolierfähigkeit besitzt. Durch den Zusatz von Chloriden oder Nitraten wird der Angriff des Kupfermetalls erleichtert und gleichmäßiger gestaltet. Es hat sich auch ergeben, daß, nachdem der Niederschlag eine gewisse Dicke erreicht hat, oft örtliche Ausblühungen von lockerer Beschaffenheit entstehen, die sich leicht abwischen lassen und die Isolierfähigkeit gefährden. Diese Erscheinung wird durch die Gegenwart von Ammoniumsalz behoben. Indem man dem Bad noch einen Zusatz eines starken Oxydationsmittels gibt, z. B. Alkalichnomat, das jedoch die Wasserstoffionenkonzentration nicht ändern darf, wird von Anfang an das sich bildende Kupfersalz in der höchsten Oxydationsstufe erhalten.According to the new process, it is also possible to apply anodic treatment to copper To achieve layers with similar properties. It has been shown that particularly aqueous solutions of secondary alkali metal phosphates are suitable as electrolyte, in that basic cupric phosphate is formed during anodic treatment, which under favorable Working conditions the copper plates as a thin, hard and even layer that has good insulating properties. By adding chlorides or nitrates, the The attack of the copper metal is made easier and more uniform. It has too show that, after the precipitation has reached a certain thickness, local efflorescence is often found of a loose texture that can be easily wiped off and endanger the insulating properties. This appearance is remedied by the presence of ammonium salt. By adding a strong oxidizing agent to the bath there, e.g. B. Alkalichnomat, which however does not change the hydrogen ion concentration allowed, the forming copper salt is in the highest oxidation state from the beginning obtain.
Es hat sich ferner auch gezeigt, daß der Überzug am günstigsten ausfällt, wenn die Stromdichte in gewissen Grenzen gehalten wird. Statt Gleichstrom kann auch Wechsel-It has also been shown that the coating is the cheapest when the Current density is kept within certain limits. Instead of direct current, alternating
strom benutzt werden, es ist dann aber eine viel höhere ..Stromdichte, .notwendig.electricity can be used, but then a much higher current density is .necessary.
Die anodische Behandlung von Kupfer ist an sich bekannt; jedoch führte man bisher diese in aolchen Lösungen aus, die entweder, eine künstliche Patina oder ein Kupferoxyd,-das ein Halbleiter für den elektrischen Strom ist, erzeugten. Elektrisch isolierende Schichten erhielt man mit den bekannten Verfahren ίο jedenfalls nicht.The anodic treatment of copper is known per se; however, one led so far these in all solutions which either, an artificial patina or a copper oxide, -that is a semiconductor for the electric current is generated. Electrically insulating layers were obtained using the known processes ίο at least not.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH188131T | 1936-04-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE645912C true DE645912C (en) | 1937-06-04 |
Family
ID=4435423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEM134438D Expired DE645912C (en) | 1936-04-24 | 1936-05-09 | Process for producing electrically insulating layers on copper conductors |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH188131A (en) |
| DE (1) | DE645912C (en) |
| FR (1) | FR820255A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1002831B (en) * | 1953-01-24 | 1957-02-21 | Vacuumschmelze Ag | Process for producing an electrically insulating, heat-resistant and corrosion-resistant layer |
-
1936
- 1936-04-24 CH CH188131D patent/CH188131A/en unknown
- 1936-05-09 DE DEM134438D patent/DE645912C/en not_active Expired
-
1937
- 1937-04-02 FR FR820255D patent/FR820255A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1002831B (en) * | 1953-01-24 | 1957-02-21 | Vacuumschmelze Ag | Process for producing an electrically insulating, heat-resistant and corrosion-resistant layer |
Also Published As
| Publication number | Publication date |
|---|---|
| FR820255A (en) | 1937-11-08 |
| CH188131A (en) | 1936-12-15 |
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