DE1300759B - Bath for the anodic removal of galvanically applied coatings of copper, copper alloys, silver, zinc and titanium - Google Patents
Bath for the anodic removal of galvanically applied coatings of copper, copper alloys, silver, zinc and titaniumInfo
- Publication number
- DE1300759B DE1300759B DE1967B0094693 DEB0094693A DE1300759B DE 1300759 B DE1300759 B DE 1300759B DE 1967B0094693 DE1967B0094693 DE 1967B0094693 DE B0094693 A DEB0094693 A DE B0094693A DE 1300759 B DE1300759 B DE 1300759B
- Authority
- DE
- Germany
- Prior art keywords
- copper
- bath
- silver
- titanium
- zinc
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
- B23H3/08—Working media
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F5/00—Electrolytic stripping of metallic layers or coatings
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Electroplating And Plating Baths Therefor (AREA)
Description
Die Erfindung bezieht sich auf ein Bad zum elektrolytischen Ablösen galvanischer Niederschläge von Grundkörpern aus Kupfer, Kupferlegierungen, Silber, Zink und Titan, aus einer wäßrigen Lösung eines Salzes der Rhodanwasserstoffsäure, vorzugsweise von Ammoniumrhodanid.The invention relates to an electrolytic stripping bath galvanic deposition of base bodies made of copper, copper alloys, silver, Zinc and titanium, from an aqueous solution of a salt of hydrofluoric acid, preferably from ammonium rhodanide.
Wenn beim galvanischen Überziehen von Gegenständen, z. B. von Scheinwerferhauben, Armaturen die Überzüge defekt ausfallen, so müssen diese defekten Überzüge zunächst wieder abgelöst werden, ehe die Gegenstände erneut galvanisch überzogen werden können. Ein mechanisches Entfernen defekter überzüge bedingt einen hohen Arbeitsaufwand und hohe Kosten und ist bei komplizierter gestalteten Gegenständen meist nicht durchführbar.When electroplating objects such. B. of headlight hoods, If the fittings are defective, these defective coatings must first be detached again before the objects can be galvanically coated again. A mechanical removal of defective coatings requires a lot of work and high costs and is usually not feasible with more complicatedly designed objects.
Es ist bekannt, solche Gegenstände durch Eintauchen derselben in ein geeignetes chemisches Bad abzulösen, jedoch verlangen derartige chemische Bäder sehr lange Ablösezeiten, weshalb diese Verfahren unwirtschaftlich sind. Es ist auch bekannt, solche defekten Teile elektrolytisch in sehr starker Schwefelsäure abzulösen, jedoch wird bei sehr langen Ablösezeiten das Grundmaterial erheblich angegriffen.It is known to remove such objects by immersing them in a To remove a suitable chemical bath, however, require such chemical baths very long removal times, which is why these processes are uneconomical. It is also known to remove such defective parts electrolytically in very strong sulfuric acid, however, if the removal times are very long, the base material is considerably attacked.
Wirksamer und schneller lassen sich solche defekten Überzüge anodisch in Bädern ablösen, die eine wäßrige Lösung eines Salzes der Rhodanwasserstoffsäure, insbesondere von Ammoniumrhodanid enthalten.Defective coatings of this kind can be anodized more effectively and more quickly dissolve in baths containing an aqueous solution of a salt of hydrofluoric acid, in particular of ammonium rhodanide.
Aber auch beim Arbeiten mit solchen Bädern treten noch verschiedene Mängel auf. Einmal ist die gebildete Schutzschicht auf dem Grundmaterial nicht homogen, so daß Lochfraß auftritt, darüber hinaus lassen sich ohne weitere Zusätze Halb- und Mattglanznickelschichten nur sehr langsam ablösen.But even when working with such baths, there are still different ones Defects. Once the protective layer formed on the base material is not homogeneous, so that pitting occurs, in addition, half- and peel off matt nickel layers only very slowly.
Der Erfindung liegt die Aufgabe zugrunde, ein Bad zum elektrolytischen Ablösen galvanischer überzüge von Grundkörpern aus Kupfer, Kupferlegierungen, Silber, Zink oder Titan zu schaffen, welches die vorgenannten Nachteile der bekannten Bäder nicht mehr aufweist.The invention is based on the object of a bath for electrolytic Removal of galvanic coatings from base bodies made of copper, copper alloys, silver, To create zinc or titanium, which have the aforementioned disadvantages of the known baths no longer has.
Die Erfindung besteht darin, daß einem Bad, das aus einer wäßrigen Lösung eines Salzes der Rhodanwasserstoffsäure, vorzugsweise aus einer wäßrigen Lösung von Ammoniumrhodanid, besteht, eine Verbindung aus der Gruppe der Phenole zugesetzt wird.The invention is that a bath, which consists of an aqueous Solution of a salt of hydrofluoric acid, preferably from an aqueous one Solution of ammonium rhodanide, a compound from the group of phenols is added.
Der Erfindung zufolge können dem Bad Phenol und/oder Nitrophenol zugesetzt werden.According to the invention, phenol and / or nitrophenol can be added to the bath will.
Wie umfangreiche praktische Erprobungen ergeben haben, werden durch den Zusatz eines solchen Phenols die Ablösegeschwindigkeiten von Matt- und Halbglanznickel enorm erhöht, und es bildet sich auf dem Grundmaterial eine stromundurchlässge und wasserabstoßende Schicht, so daß keine Anfressungen am Grundkörper auftreten. Die Schutzschicht wird durch Tauchen in eine verdünnte Ätznatronlösung entfernt.How extensive practical tests have shown are through the addition of such a phenol reduces the peeling rates of matt and semi-gloss nickel enormously increased, and it forms on the base material a current-impermeable and water-repellent layer, so that no pitting occurs on the base body. the Protective layer is removed by dipping in a dilute caustic soda solution.
In der Praxis haben sich Badkonzentrationen von 50 bis 200 g/1 Ammoniumrhodanid und 10 bis 80 cms/1 Phenol als Geeignet erwiesen. Es wird in einem Temperaturbereich von 20 bis 40° C gearbeitet.In practice, bath concentrations of 50 to 200 g / l ammonium rhodanide have proven to be good and 10 to 80 cms / 1 phenol have been found suitable. It will be in a temperature range worked from 20 to 40 ° C.
Als Kathode kann ein Blech aus rostfreiem Stahl verwendet werden.A sheet of stainless steel can be used as the cathode.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1967B0094693 DE1300759B (en) | 1967-09-28 | 1967-09-28 | Bath for the anodic removal of galvanically applied coatings of copper, copper alloys, silver, zinc and titanium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1967B0094693 DE1300759B (en) | 1967-09-28 | 1967-09-28 | Bath for the anodic removal of galvanically applied coatings of copper, copper alloys, silver, zinc and titanium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1300759B true DE1300759B (en) | 1969-08-07 |
Family
ID=6987735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1967B0094693 Pending DE1300759B (en) | 1967-09-28 | 1967-09-28 | Bath for the anodic removal of galvanically applied coatings of copper, copper alloys, silver, zinc and titanium |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1300759B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2549411A (en) * | 1946-12-06 | 1951-04-17 | Henderson M Bell | Electrolytic stripping of nickel coatings from ferrous metals |
-
1967
- 1967-09-28 DE DE1967B0094693 patent/DE1300759B/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2549411A (en) * | 1946-12-06 | 1951-04-17 | Henderson M Bell | Electrolytic stripping of nickel coatings from ferrous metals |
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