DE608268C - Process for the electrolytic deposition of metals and metal alloys - Google Patents
Process for the electrolytic deposition of metals and metal alloysInfo
- Publication number
- DE608268C DE608268C DESCH98209D DESC098209D DE608268C DE 608268 C DE608268 C DE 608268C DE SCH98209 D DESCH98209 D DE SCH98209D DE SC098209 D DESC098209 D DE SC098209D DE 608268 C DE608268 C DE 608268C
- Authority
- DE
- Germany
- Prior art keywords
- metals
- metal
- metal alloys
- electrolytic deposition
- solutions
- 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
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
Description
Verfahren zur elektrolytischen Abscheidung von Metallen und Metallegierungen Bei der elektrolytischen Abscheidung von Metallen, wie Gold, Silber, Kupfer, Cadmium usw., oder von Legierungen, wie Messing und Bronze, bedient man sich in der Regel der cyankalischen Lösungen, weil in diesen Verbindungen das Metall im komplexen Anion vorliegt, wodurch die Möglichkeit gegeben ist, auch die Plattierung von Metallen durchzuführen, welche unedler als das abzuscheidende Metall sind.Process for the electrolytic deposition of metals and metal alloys In the electrolytic deposition of metals such as gold, silver, copper, cadmium etc., or alloys such as brass and bronze are usually used the cyankali solutions, because in these compounds the metal in the complex Anion is present, which gives the possibility of also plating metals perform which are less noble than the metal to be deposited.
Man benützt diese cyankalischen Bäder durchweg in der Technik trotz der Giftigkeit der dabei zur Verwendung kommenden Salze, weil kein geeigneter Ersatz bekannt war. Gegenstand vorliegender Erfindung ist der Ersatz der giftigen cyankalischen Bäder durch die ungiftigen Rhodanverbindungen.In spite of this, these cyankali baths are used consistently in technology the toxicity of the salts used because there is no suitable substitute was known. The subject of the present invention is the replacement of the poisonous cyankali Baths through the non-toxic rhodan compounds.
Die Verwendung von Rhodanverbindungen in Verbindung mit der elektrolytischen Nickelfällung ist bereits bekannt, man erhält aus Nickellösungen unter Zusatz von Rhodanverbindungen schwarze Niederschläge, die in der Hauptsache wohl aus Metall bestehen, in chemischer und mechanischer Hinsicht aber sehr wenig widerstandsfähig sind.The use of rhodan compounds in conjunction with the electrolytic Nickel precipitation is already known; one obtains from nickel solutions with the addition of Rhodan compounds black precipitates, most of which are probably made of metal exist, but chemically and mechanically very little resistant are.
Es hat sich nun gezeigt, daß fast alle Metalle mit Rhodaniden Verbindungen zu geben vermögen, die entweder direkt in Wasser löslich sind oder lösliche Doppelsalze, wie z. B. beim Zinn und Blei, wo man cyankalische Lösungen bisher überhaupt nicht kannte, geben.It has now been shown that almost all metals are compounds with rhodanides able to give, which are either directly soluble in water or soluble double salts, such as B. in the case of tin and lead, where cyankali solutions have not yet been found at all knew give.
Aus diesen Rhodanidlösungen erhält man Metallniederschläge, welche denen aus cyankalischen Lösungen nicht nur nicht nachstehen hinsichtlich ihrer Eigenschaften, sondern man erhält zum Teil Niederschläge mit feinerem Korn als aus der cyankalischen Lösung. Außerdem sind die Ausbeuten aus diesen Bädern nahezu quantitativ, und die' erforderlichen Badspannungen liegen sehr niedrig.From these rhodanide solutions, metal precipitates are obtained, which not only are not inferior to those from cyankali solutions in terms of their properties, but one receives partly precipitation with finer grain than from the Cyancalian Solution. In addition, the yields from these baths are almost quantitative, and the ' required bath voltages are very low.
Ein Bad für die Silberabscheidung hat z. B. folgende Zusammensetzung 33 g Silberrhodanid, Zoo g Natriumrhodanid, z 1 Wasser; für die Kupferabscheidung kommt folgende Zusammensetzung in Betracht: z. B.A bath for silver deposition has z. B. the following composition 33 g silver rhodanide, zoo g sodium rhodanide, z 1 water; for copper deposition the following composition comes into consideration: z. B.
43 g Cuprorhodanid, Zoo g Ammoniumrhodanid, ro g Natriumsulfit, 11 Wasser, oder: 34 g Cuprochlorid, 23o g Ammoniumrhodanid, zo g Natriumsulfit, 11 Wasser.43 g Cuprorhodanid, zoo g of ammonium thiocyanate, ro g of sodium sulfite, 1 1 of water, or: 34 g of cuprous chloride, 23o g of ammonium thiocyanate, zo g of sodium sulfite, 1 1 water.
Badspannung: 0,5 Volt; Stromdichte: zoo Amp/qm; Ausbeute 98,5°/o auf Cuprosalz berechnet.Bath voltage: 0.5 volts; Current density: zoo amp / sqm; Yield 98.5% Cupro salt calculated.
Das Metall scheidet sich dicht und festhaftend aus - diesen Lösungen ab und zeigt einen Glanz, wie er in cyankalischen Bädern nicht erhalten wird. Durch Zusatz von Kolloiden oder kapillaraktiven Substanzen kann die Glanzwirkung noch gesteigert werden. Beim Silber ist das Korn des Niederschlages so fein, daß der Niederschlag an der Wollschwabbel auf Hochglanz poliert werden kann.The metal separates out tightly and firmly - these solutions and shows a shine that cannot be obtained in cyankali baths. By The addition of colloids or capillary-active substances can still improve the gloss effect can be increased. In the case of silver, the grain of the precipitate is so fine that the Precipitation on the wool buff can be polished to a high gloss.
Es ist nicht nötig, bei der Badherstellung von den reinen Schwermetallrhodaniden auszugehen, man kann auch derart verfahren, daß man zu den entsprechenden Metallsalzlösungen Rhodansalze zugibt, bis das evtl. ausgeschiedene Schwermetallrhodanid wieder in Lösung gebracht ist. In der Regel empfiehlt sich ein Überschuß von Rhodanalkali- oder Erdalkalimetallen, um das sich an der Anode bildende Schwermetallrhodanid leichter in Lösung zu bringen. Auch durch Zusatz von Sulfiten kann z. B. beim Kupfer die Anodenlöslichkeit gefördert werden.It is not necessary when making the bath from the pure heavy metal rhodanides assume that one can also proceed in such a way that one leads to the corresponding metal salt solutions Rhodan salts are added until the heavy metal rhodanide that may have separated out again in Solution is brought. As a rule, an excess of Rhodanalkali- or alkaline earth metals to lighten the heavy metal rhodanide that forms at the anode to bring into solution. Also by adding sulfites, z. B. the copper Anode solubility are promoted.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DESCH98209D DE608268C (en) | 1932-06-30 | 1932-06-30 | Process for the electrolytic deposition of metals and metal alloys |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DESCH98209D DE608268C (en) | 1932-06-30 | 1932-06-30 | Process for the electrolytic deposition of metals and metal alloys |
Publications (1)
Publication Number | Publication Date |
---|---|
DE608268C true DE608268C (en) | 1935-01-19 |
Family
ID=7446328
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DESCH98209D Expired DE608268C (en) | 1932-06-30 | 1932-06-30 | Process for the electrolytic deposition of metals and metal alloys |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE608268C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE758075C (en) * | 1938-05-04 | 1951-08-02 | E J Du Pont De Nemours & Compa | Bath for the galvanic production of copper deposits |
DE937211C (en) * | 1952-07-10 | 1955-12-29 | Metallic Industry Nv | Bath and process for the electrolytic coating of metal or non-metal objects made conductive with a high-gloss silver layer |
-
1932
- 1932-06-30 DE DESCH98209D patent/DE608268C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE758075C (en) * | 1938-05-04 | 1951-08-02 | E J Du Pont De Nemours & Compa | Bath for the galvanic production of copper deposits |
DE937211C (en) * | 1952-07-10 | 1955-12-29 | Metallic Industry Nv | Bath and process for the electrolytic coating of metal or non-metal objects made conductive with a high-gloss silver layer |
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