DE657365C - Process for the direct silver plating of nickel and nickel-containing alloys - Google Patents

Process for the direct silver plating of nickel and nickel-containing alloys

Info

Publication number
DE657365C
DE657365C DESCH103949D DESC103949D DE657365C DE 657365 C DE657365 C DE 657365C DE SCH103949 D DESCH103949 D DE SCH103949D DE SC103949 D DESC103949 D DE SC103949D DE 657365 C DE657365 C DE 657365C
Authority
DE
Germany
Prior art keywords
nickel
silver
containing alloys
silver plating
direct silver
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
DESCH103949D
Other languages
German (de)
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.)
Dr Ing Max Schloetter GmbH and Co KG
Original Assignee
Dr Ing Max Schloetter GmbH and Co KG
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 Dr Ing Max Schloetter GmbH and Co KG filed Critical Dr Ing Max Schloetter GmbH and Co KG
Priority to DESCH103949D priority Critical patent/DE657365C/en
Application granted granted Critical
Publication of DE657365C publication Critical patent/DE657365C/en
Expired legal-status Critical Current

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
    • C25D3/46—Electroplating: Baths therefor from solutions of silver

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating And Plating Baths Therefor (AREA)

Description

Verfahren zur unmittelbaren Versilberung von Nickel und nickelhaltigen Legierungen Bei der Versilberung von Nickel und nickelhaltigen Gebmens.tänden zeigt sich immer der Übelstand, daß die Waren nicht in einem Gang mit einer festhaftenden Silberschicht überzogen werden können, sondern sie müssen vorher in einem Vorversilberungsbad, welches wenig Silber, aber viel freies Cya,nkalium oder -natrium enthält, kurze Zeit bei hoher Spannung vo:rversilbert, ,gekratzt, verquickt und darin in dem eigentlichen Silberbad normaler Zusammensetzung fertig versilbert werden. Der besseren Haftfestigkeit wegen rauht man Gegenstände .aus dien erwähnten Legierungen auf, z. B. durch Behandlung mit Bimsstein.. Dieses Verfahren bedingt eine Reihe von Arbeitsgängen, die durch das nachstehend beschriebene sämtlich in Wegfall kommen.Process for the direct silver plating of nickel and nickel-containing Alloys When silver-plating nickel and nickel-containing objects, shows There is always the inconvenience that the goods are not in a corridor with a firmly adhering one Silver layer can be coated, but they must first be in a pre-silvering bath, which contains little silver but a lot of free cyano, potassium or sodium, short Time at high voltage, silver-plated, scratched, merged and in the actual Silver bath of normal composition can be silver-plated. The better adhesive strength Because of this, objects are roughened. Made of the alloys mentioned, e.g. B. by treatment with pumice stone .. This process requires a number of operations, which through all of the items described below are omitted.

Es wurde nämlich gefunden, daß sich Gegenstände aus Nickel und Nick ellegierungen ohne jede Vorbehandlun,g nach genügender Reinigung und Entfettung, also. auch im piolierten Zustand, in einem Arbeitsgang gut und festhaftend versilbern lassen, wenn man Silberbäder verwendet, welche neben einem großen überschuß an Alkalicyaniden noch freies Alkali enthalten. Daß eine gewisse Alkalität des Silberbades in Rücksicht auf die Stromausbeute günstig wirkt, hatte schon B runner - (Diss. Zürich 1997, S.37) gefunden, wobei er einen Alkaligehalt von 1/l0 Mol K O H anwandte. D,aß aber ein erhöhter Alkaligehalt in Silberbädern mit gr o-Bem übergchuß an freien A.lkalicyanidien auf die Haftintensität des Silbers auf Nickel und Nickellegierungen von günstigem Einfluß ist, war eine überraschiendie Feststellung und keinesfalls vorauszusehen. Für die Lösung des Silbers kann man Cya:nide, Halogenide, Rh.odianide verwenden.It was found that objects made of nickel and nick el alloys without any pretreatment, g after sufficient cleaning and degreasing, so. Silver-plating well and firmly in one operation, even in the pied condition if one uses silver baths, which in addition to a large excess of alkali metal cyanides still contain free alkali. That the silver bath has a certain alkalinity in consideration has a positive effect on the power yield, had already B runner - (Diss. Zurich 1997, P.37), using an alkali content of 1/10 mol K O H. D, but ate an increased alkali content in silver baths with a large excess of free alkali metal cyanidiums on the adhesion intensity of the silver on nickel and nickel alloys of favorable Influence was a surprising finding and by no means to be foreseen. For the solution of the silver one can use cyanide, halide, rhodianide.

Man benutzt z. B. ein Bad, welches enthält 1 5 g Silber, gelöst als Cyanid oder Rhodanid, 12o g Kaliumcyanid, 40g Kaliumhy.droxyd auf i 1 Wasser. Als Anoden verwendet man Reinsilber und arbeitet mit einer Stromdichte von i oo bis Zoo Amp/qm.One uses z. B. a bath which contains 1 5 g of silver, dissolved as cyanide or rhodanide, 12o g of potassium cyanide, 40g of potassium hydroxide in 1 liter of water. Pure silver is used as anodes and works with a current density of 100 to zoo amp / qm.

Die freien Ätzalkalien mögen ganz oder teilweise durch Alkalicarbonate, Bicarbionate oder alkalisch reagierende andere Salze, wie z. B. Phosphate, ersetzt werden.The free caustic alkalis may be wholly or partially replaced by alkali carbonates, Bicarbionates or other alkaline salts, such as. B. phosphates replaced will.

Claims (2)

PArrrTANSPizücHr: i. Verfahren zur unmittelbaren Ve:r--silber ung von Nickel ioder nickelhaltigen Legierungen, dadurch gekennzeichnet, daß Silberbäder mit einem großen L berschuß an freien Alkalicyaniden verwendet werden, die außerdem noch freie Ätzalkalien enthalten. PArrrTANSPiCe: i. Process for the immediate de: r - silvering of nickel or nickel-containing alloys, characterized in that silver baths with a large excess of free alkali metal cyanides are used, which also still contain free caustic alkalis. 2. Verfahren zur unmittelbaren Versilberung von Nickeloder nickelhaltigen Legierungen .nach Anspruch i, dadurch gekennzeichnet, daß die freien Ätzalkalien ganz oder teilweisse durch alkalisch reagierende Salze ersetzt werden.2. Process for the direct silver plating of Nickel or nickel-containing alloys .according to claim i, characterized in that that the free caustic alkalis are wholly or partially due to alkaline salts be replaced.
DESCH103949D 1934-04-10 1934-04-10 Process for the direct silver plating of nickel and nickel-containing alloys Expired DE657365C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DESCH103949D DE657365C (en) 1934-04-10 1934-04-10 Process for the direct silver plating of nickel and nickel-containing alloys

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DESCH103949D DE657365C (en) 1934-04-10 1934-04-10 Process for the direct silver plating of nickel and nickel-containing alloys

Publications (1)

Publication Number Publication Date
DE657365C true DE657365C (en) 1938-03-03

Family

ID=7447584

Family Applications (1)

Application Number Title Priority Date Filing Date
DESCH103949D Expired DE657365C (en) 1934-04-10 1934-04-10 Process for the direct silver plating of nickel and nickel-containing alloys

Country Status (1)

Country Link
DE (1) DE657365C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2418712A1 (en) * 1974-04-18 1975-10-30 Nischne Tagil Silver catalyst for oxidation of methanol to formaldehyde - prepd. by impregnating carrier with complex silver ion soln. and reducing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2418712A1 (en) * 1974-04-18 1975-10-30 Nischne Tagil Silver catalyst for oxidation of methanol to formaldehyde - prepd. by impregnating carrier with complex silver ion soln. and reducing

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