DE765769C - Process for chroming objects made of iron or steel in a salt bath - Google Patents

Process for chroming objects made of iron or steel in a salt bath

Info

Publication number
DE765769C
DE765769C DEM153165D DEM0153165D DE765769C DE 765769 C DE765769 C DE 765769C DE M153165 D DEM153165 D DE M153165D DE M0153165 D DEM0153165 D DE M0153165D DE 765769 C DE765769 C DE 765769C
Authority
DE
Germany
Prior art keywords
salt bath
iron
steel
objects made
chroming
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
DEM153165D
Other languages
German (de)
Inventor
Gottfried Dr Phil Becker
Karl Dr-Ing Daeves
Robert Goebel
Fritz Dr Phil Steinberg
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.)
METALL DIFFUSIONS GmbH
Original Assignee
METALL DIFFUSIONS GmbH
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 METALL DIFFUSIONS GmbH filed Critical METALL DIFFUSIONS GmbH
Priority to DEM153165D priority Critical patent/DE765769C/en
Application granted granted Critical
Publication of DE765769C publication Critical patent/DE765769C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/18—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions
    • C23C10/20—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions only one element being diffused
    • C23C10/24—Salt bath containing the element to be diffused

Landscapes

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

Description

Verfahren zum Chromieren von Gegenständen aus Eisen oder Stahl in einem Salzbad Es wurde schon vorgeschlagen, Gegenstände aus Eisen oder Stahl in ihrer Oberfläche dadurch. an Chrom anzureichern, daß man sie mit Chrom oder Ferrochrom zusammen im Salzbad erhitzt. Es war weiterhin als vorteilhaft erkannt worden, dem Salzbad außerdem noch solche Chloride beizugeben, die mit dem Chrom durch chemischen Umsatz Chromochlorid bilden, das dann mit der Oberfläche der Gegenstände unter Abscheidung von Chrom reagieren kann. Auf diese Weise wird das Chrom in einer für die Anreicherung durch Diffusion besonders günstigen feinstverteilten Form dargeboten.Process for chroming objects made of iron or steel in It has been suggested to put objects made of iron or steel in a salt bath their surface. to enrich chromium, that they can be enriched with chromium or ferrochrome heated together in a salt bath. It had also been recognized as beneficial to the Salt bath also still add such chlorides, which are chemical with the chromium Sales form chromochloride, which is then deposited with the surface of the objects of chromium can react. This way the chromium is in one place for enrichment particularly favorable finely divided form presented by diffusion.

Nun wurde gefunden, daß beim Chromieren von Gegenständen aus Eisen und Stahl besonders gute Ergebnisse hinsichtlich Dicke und Aussehen der chromangereicherten Zone erzielt werden, wenn man die Chromochloridbildung im Bad nicht sich selbst überläßt, sondern sie nach Bedarf vergrößert. Es wäre naheliegend, diese Absicht dadurch zu verwirklichen, daß man von Anbeginn an einen genügend hohen Zuschlag an Chromochlorid zum Salzbad gäbe; es zeigt sich aber, daß alsdann ein beachtlicher Verlust an Chromochlorid durch Verdampfung eintritt und daher die- Konzentration des Chromochlorids sich während des Prozesses stark ändert. Im allgemeinen ist aber eine gleichmäßige Konzentration während der ganzen Arbeitsdauer erwünscht. Zur Erreichung dieses Zwecks kann man nun nach der Erfindung z. B. in das Salzbad einen Chlorwasserstoftstrom einleiten. der mit dem im Salzbad befindlichen Chrom oder Ferrochrom unter Bildung von Chromochlorid reagiert, wobei die Menge des Chlorwasserstoffes je nach dem Chromochloridbedarf wunschgemäß geregelt werden kann. Es ist mit gleich guter Wirkung ebenso angängig, das in das Salzbad einzubringende Chrom oder Ferrochrom vorher bei höheren Temperaturen, z. B. Rotglut, im Chlorwasserstoffstrom zu behandeln und das auf diese Weise mit Chromochlorid beladene Metall weiterhin im Verlauf des Prozesses dem Salzbad je nach Bedarf zuzusetzen.It has now been found that when chrome-plating objects made of iron and steel particularly good results in terms of thickness and appearance of the chromium-enriched Zone can be achieved if the chromochloride formation in the bathroom is not itself leaves, but increases it as needed. It would be obvious to have this intention to be realized by having a sufficiently high surcharge from the start of chromochloride to the salt bath; but it turns out that then a considerable loss of chromochloride occurs through evaporation and therefore the The concentration of chromochloride changes significantly during the process. In general however, an even concentration during the entire duration of the work is desirable. To achieve this purpose you can now according to the invention, for. B. in the salt bath introduce a stream of hydrogen chloride. the one with the chromium in the salt bath or ferrochrome reacts to form chromochloride, the amount of hydrogen chloride can be regulated as desired depending on the chromochloride requirement. It is the same with good effect, the chromium or ferrochrome to be introduced into the salt bath is also available beforehand at higher temperatures, e.g. B. red heat to be treated in a stream of hydrogen chloride and the metal loaded with chromochloride in this way continues in the course of the Process to add to the salt bath as needed.

Die nach diesem Verfahren behandelten Gegenstände erhalten in kürzerer Zeit dickere Zonen als Gegenstände, die nach dem einleitend beschriebenen Chromierungsverfahren chromi.ert «-erden. Die nach der Erfindung chromierten Gegenstände zeichnen sich äußerlich ferner durch eine glattere und ansehnlichere Oberfläche aus. so daß die sonst oft notwendige Nachbehandlung im allgemeinen fortfallen kann.The objects treated according to this process get shorter Time thicker zones than objects made after the chromating process described in the introduction chromi.ert «-erden. The objects chromed according to the invention stand out externally also by a smoother and more attractive surface. So that the Post-treatment that is otherwise often necessary can generally be omitted.

Claims (1)

PATENTANSPRUCH: Verfahren zum Chromieren von Gegenständen aus Eisen oder Stahl in einem Salzbad, gekennzeichnet durch Zusetzen von Cl-Verbindungen während der Behandlungsdauer, entweder durch Einleiten von Chlor-,vasserstoffgas in das geschmolzene, Chrom oder Ferrochrom enthaltende Salzbad oder durch Einbringen von Chrom- oder Ferrochromstücken. die vorher bei höheren Temperaturen, z. B. bei Rotglut, im Chlorwasserstoffstrom behandelt und daher mit Chromochlorid beladen sind.PATENT CLAIM: Process for chrome plating objects made of iron or steel in a salt bath, characterized by adding Cl compounds during the duration of the treatment, either by introducing chlorine or hydrogen gas into the molten salt bath containing chromium or ferrochrome or by introducing Chrome or ferrochrome pieces. previously at higher temperatures, e.g. B. red heat, treated in a stream of hydrogen chloride and are therefore loaded with chromochloride.
DEM153165D 1942-02-07 1942-02-07 Process for chroming objects made of iron or steel in a salt bath Expired DE765769C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEM153165D DE765769C (en) 1942-02-07 1942-02-07 Process for chroming objects made of iron or steel in a salt bath

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM153165D DE765769C (en) 1942-02-07 1942-02-07 Process for chroming objects made of iron or steel in a salt bath

Publications (1)

Publication Number Publication Date
DE765769C true DE765769C (en) 1954-10-25

Family

ID=7337140

Family Applications (1)

Application Number Title Priority Date Filing Date
DEM153165D Expired DE765769C (en) 1942-02-07 1942-02-07 Process for chroming objects made of iron or steel in a salt bath

Country Status (1)

Country Link
DE (1) DE765769C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0043506A2 (en) * 1980-07-02 1982-01-13 Degussa Aktiengesellschaft Method of forming vanadium carbide layers on iron

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0043506A2 (en) * 1980-07-02 1982-01-13 Degussa Aktiengesellschaft Method of forming vanadium carbide layers on iron
EP0043506A3 (en) * 1980-07-02 1982-05-26 Degussa Aktiengesellschaft Method of forming vanadium carbide layers on iron

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