DE630934C - Process for the production of a tarnish-resistant, invisible surface protective layer on silver or silver alloys - Google Patents

Process for the production of a tarnish-resistant, invisible surface protective layer on silver or silver alloys

Info

Publication number
DE630934C
DE630934C DEM124701D DEM0124701D DE630934C DE 630934 C DE630934 C DE 630934C DE M124701 D DEM124701 D DE M124701D DE M0124701 D DEM0124701 D DE M0124701D DE 630934 C DE630934 C DE 630934C
Authority
DE
Germany
Prior art keywords
silver
tarnish
resistant
protective layer
production
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
DEM124701D
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.)
DRUIDENAU EISMASCHINEN und KUE
Original Assignee
DRUIDENAU EISMASCHINEN und KUE
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 DRUIDENAU EISMASCHINEN und KUE filed Critical DRUIDENAU EISMASCHINEN und KUE
Priority to DEM124701D priority Critical patent/DE630934C/en
Application granted granted Critical
Publication of DE630934C publication Critical patent/DE630934C/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
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/38—Chromatising

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Description

Verfahren zur Herstellung einer anlaufbeständigen, nicht sichtbaren Oberflächenschutzschicht auf Silber oder Silberlegierungen Silber und Silberlegierungen färben sich leicht und schnell sehr stark infolge Bildung von Schwefelsilber bräunlich bis schw=arz. Die Bildung des Schwefelsilbers erfolgt durch feste und gasförmige Schwefelverbindungen, die zum Teil in der Atmosphäre, zum Teil in festen Körpern enthalten sind.Process for producing a tarnish-resistant, invisible one Surface protection layer on silver or silver alloys Silver and silver alloys easily and quickly become very brownish as a result of the formation of sulfur silver to black. The formation of the sulfur silver takes place through solid and gaseous Sulfur compounds, some in the atmosphere, some in solids are included.

Durch Verchromen, Rhodinieren usw. kann das Anlaufen verhindert werden. Diese gegen Schwefel unempfindlichen Metalle haben jedoch nicht die weiche und angenehme Silberfärbe.Chrome plating, rhodium plating, etc. can prevent tarnishing. However, these metals, which are insensitive to sulfur, do not have the soft and pleasant ones Silver dye.

ach einem anderen Verfahren taucht man die Silbergegenständein eine stark verdünnte Chromsäurelösung, wodurch sich eine dünne, zarte und unsichtbare Chromatschutzschicht bildet.After another process, the silver objects are immersed in one highly diluted chromic acid solution, creating a thin, delicate and invisible Forms a protective chromate layer.

Es wurde auch schon vorgeschlagen, den silbernen Gegenstand kathodisch in einer wässerigen Lösung von Chromsäure oder Chromaten zu 'behandeln. Man erreicht so einen unsichtbaren Oberflächenschutz, dessen Anlaufbeständigkeit auf einfache und schnelle Weise erreicht wird, der aber noch nicht genügend dauerhaft ist.It has also been suggested that the silver object be cathodic to treat in an aqueous solution of chromic acid or chromates. One achieves such an invisible surface protection, whose tarnish resistance is easy and quick way is achieved, but which is not yet sufficiently permanent.

Es wurde nun gefunden, daß sich die Anlaufbeständigkeit stark verbessern läßt, wenn man die kathodische Behandlung in einem Elektrolyten ausführt, der neben Chromsäure oder Chromaten Säuren wie Schwefel- oder Salzsäure enthält.It has now been found that the tarnishing resistance is greatly improved leaves, if one carries out the cathodic treatment in an electrolyte, the next Contains chromic or chromic acids such as sulfuric or hydrochloric acid.

Dadurch wird nicht nur eine anlaufbeständigere Schutzschicht, sondern auch eine bedeutend bessere Tiefenwirkung erreicht, die für die Behandlung von Hohlgeräten und Gegenständen mit Vertiefungen von Wichtigkeit ist.This not only creates a more tarnish-resistant protective layer, but A significantly better depth effect is also achieved, which is necessary for the treatment of hollow devices and objects with pits is important.

Die Bildung der Schutzschicht geht bei Zimmertemperatur vor sich, es kann aber auch mit Vorteil ein warmer oder heißer Elektrolyt verwendet werden.The formation of the protective layer takes place at room temperature, however, a warm or hot electrolyte can also be used with advantage.

Die Spannung soll 5 bis 7 Volt betragen. Die Silbergegenstände werden r -bis 5 Minuten als Kathode behandelt, dann in kaltem und heißem Wasser abgespült und getrocknet.The voltage should be 5 to 7 volts. The silver items will be r - Treated as a cathode for up to 5 minutes, then rinsed in cold and hot water and dried.

Claims (1)

PATENTANSPRUCH: -Verfahren zur Herstellung- einer anlaufbeständigen-nicht sichtbaren Schutzschicht auf Silber oder .Silberlegierungen auf elektrolytischem Wege, dadurch gekennzeichnet, daß das Silber kathodisch in einem Elektrolyten behandelt wird, der neben Chromsäure. bzw. Chromaten Säuren w=ie Schwefel- oder Salzsäure enthält.PATENT CLAIM: -Process for producing-a tarnish-resistant-not visible protective layer on silver or .silver alloys on electrolytic Ways, characterized in that the silver is treated cathodically in an electrolyte that next to chromic acid. or chromic acids like sulfuric or hydrochloric acid contains.
DEM124701D 1933-06-23 1933-06-23 Process for the production of a tarnish-resistant, invisible surface protective layer on silver or silver alloys Expired DE630934C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEM124701D DE630934C (en) 1933-06-23 1933-06-23 Process for the production of a tarnish-resistant, invisible surface protective layer on silver or silver alloys

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM124701D DE630934C (en) 1933-06-23 1933-06-23 Process for the production of a tarnish-resistant, invisible surface protective layer on silver or silver alloys

Publications (1)

Publication Number Publication Date
DE630934C true DE630934C (en) 1936-06-09

Family

ID=7330584

Family Applications (1)

Application Number Title Priority Date Filing Date
DEM124701D Expired DE630934C (en) 1933-06-23 1933-06-23 Process for the production of a tarnish-resistant, invisible surface protective layer on silver or silver alloys

Country Status (1)

Country Link
DE (1) DE630934C (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732288A (en) * 1951-06-19 1956-01-24 Manufacture of metal mesh screens
DE1109976B (en) * 1958-02-08 1961-06-29 Stahl Und Walzwerke Rasselstei Process for the electrochemical treatment of tinplate or strip for food containers
DE1236898B (en) * 1962-11-10 1967-03-16 Toyo Kohan Co Ltd Process for the electrochemical production of protective coatings on metals
DE1238737B (en) * 1965-03-17 1967-04-13 Max Schloetter Fa Dr Ing Process for improving the corrosion resistance of steel goods by electrolytic means

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732288A (en) * 1951-06-19 1956-01-24 Manufacture of metal mesh screens
DE1109976B (en) * 1958-02-08 1961-06-29 Stahl Und Walzwerke Rasselstei Process for the electrochemical treatment of tinplate or strip for food containers
DE1236898B (en) * 1962-11-10 1967-03-16 Toyo Kohan Co Ltd Process for the electrochemical production of protective coatings on metals
DE1238737B (en) * 1965-03-17 1967-04-13 Max Schloetter Fa Dr Ing Process for improving the corrosion resistance of steel goods by electrolytic means

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