DE970475C - Process for the production of diffusion coatings from chromium on iron and steel - Google Patents

Process for the production of diffusion coatings from chromium on iron and steel

Info

Publication number
DE970475C
DE970475C DEM4100D DEM0004100D DE970475C DE 970475 C DE970475 C DE 970475C DE M4100 D DEM4100 D DE M4100D DE M0004100 D DEM0004100 D DE M0004100D DE 970475 C DE970475 C DE 970475C
Authority
DE
Germany
Prior art keywords
chromium
iron
steel
production
diffusion coatings
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
DEM4100D
Other languages
German (de)
Inventor
Dr-Ing Erwin Brauns
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Priority to DEM4100D priority Critical patent/DE970475C/en
Application granted granted Critical
Publication of DE970475C publication Critical patent/DE970475C/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
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes

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 Methods And Accessories (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Description

Verfahren zur Herstellung von Diffusionsüberzügen aus Chrom auf Eisen und Stahl Es ist bereits ein Verfahren zur Herstellung von Diffusionsüberzügen aus Chrom auf Eisen und Stahl vorgeschlagen worden, bei welchem ein auf galvanischem Wege hergestellter Chromüberzug in einer Wasserstoffatmosphäre unter bestimmten Bedingungen geglüht wird. Wesentlich ist dabei, daß der Wasserstoff eine geringe Wasserdampfmenge von etwa 2 bis io°/a aufweist, praktisch frei von kohlenstoffhaltigen Verbindungen ist und daß die Glühung in Gegenwart von alkalihaltigen Verbindungen oder Metalldämpfen der Alkalimetalle durchgeführt wird. Auf diese Weise lassen sich festhaftende porenfreie und sehr bildsame Diffusionsschichten aus Chrom herstellen. Es wurde nun gefunden, daß für viele praktische Zwecke genügend bildsame Diffusionsschichten auch dann hergestellt werden können, wenn auf die Anwesenheit von alkalihaltigen Verbindungen oder Metalldämpfen der Alkalimetalle verzichtet wird. Zweckmäßigerweise wird dafür die Glühtemperatur etwas höher gewählt, beispielsweise bei etwa io5o° C, wenn bei dem Verfahren nach dem eingangs erwähnten älteren Vorschlag iooo° C angewendet werden. Durch Verzicht auf die Verwendung von Alkaliverbindungen wird das Verfahren vereinfacht, ohne daß der Diffusionsüberzug in seinen Eigenschaften nennenswert beeinträchtigt wird.Process for the production of diffusion coatings from chromium on iron and steel There is already a method of making diffusion coatings from Chromium on iron and steel has been proposed, with one on galvanic Ways made chrome plating in a hydrogen atmosphere under certain conditions Conditions is annealed. It is essential that the hydrogen is low Has an amount of water vapor of about 2 to 10 ° / a, practically free of carbonaceous Compounds is and that annealing in the presence of alkaline compounds or metal vapors of the alkali metals is carried out. In this way you can Produce firmly adhering, pore-free and very malleable diffusion layers from chromium. It has now been found that plastic diffusion layers are sufficient for many practical purposes can also be produced if based on the presence of alkaline Compounds or metal vapors of the alkali metals is dispensed with. Appropriately the annealing temperature is selected to be somewhat higher, for example at around 1050 ° C, if in the process according to the older proposal mentioned at the beginning 100 ° C be applied. By avoiding the use of alkali compounds the process is simplified without affecting the properties of the diffusion coating is significantly impaired.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von Diffusionsüberzügen aus Chrom auf Eisen und Stahl, bei welchem ein auf galvanischem Wege hergestellter Chromüberzug in einer Wasserstoffatmosphäre mit einer geringen Wasserdampfmenge von etwa 2 bis zod/a geglüht wird, die jedoch frei von kohlenstoffhaltigen Verbindungen ist, dadurch gekennzeichnet, daß unter Ausschluß von alkalihaltigen Verbindungen oder Metalldämpfen der Alkalimetalle die Glühung bei etwas erhöhter Temperatur von z. B. etwa ro5o° C vorgenommen wird. In Betracht gezogene Druckschriften: Britische Patentschrift Nr. 13486,I: deutsche Patentschrift Nr. 677 113. In Betracht gezogene ältere Patente: Deutsches Patent Nr. 883 386.PATENT CLAIM: Process for the production of diffusion coatings from chromium on iron and steel, in which a chromium coating produced by electroplating is annealed in a hydrogen atmosphere with a small amount of water vapor of about 2 to zod / a, but which is free of carbon-containing compounds, characterized in that that with the exclusion of alkali-containing compounds or metal vapors of the alkali metals annealing at a slightly elevated temperature of z. B. about ro5o ° C is made. Documents considered: British Patent No. 13486, I: German Patent No. 677 1 13. Prior Patents Considered: German Patent No. 883 386.
DEM4100D 1941-05-03 1941-05-03 Process for the production of diffusion coatings from chromium on iron and steel Expired DE970475C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEM4100D DE970475C (en) 1941-05-03 1941-05-03 Process for the production of diffusion coatings from chromium on iron and steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM4100D DE970475C (en) 1941-05-03 1941-05-03 Process for the production of diffusion coatings from chromium on iron and steel

Publications (1)

Publication Number Publication Date
DE970475C true DE970475C (en) 1958-09-25

Family

ID=7292515

Family Applications (1)

Application Number Title Priority Date Filing Date
DEM4100D Expired DE970475C (en) 1941-05-03 1941-05-03 Process for the production of diffusion coatings from chromium on iron and steel

Country Status (1)

Country Link
DE (1) DE970475C (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB134864A (en) * 1900-01-01
DE677113C (en) * 1934-03-09 1939-06-19 Fritz Bergmann Process for the production of surface alloys by diffusion
DE883386C (en) * 1940-06-09 1953-07-16 Mannesmann Huettenwerke A G Process for the production of diffusion coatings from chromium on iron or steel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB134864A (en) * 1900-01-01
DE677113C (en) * 1934-03-09 1939-06-19 Fritz Bergmann Process for the production of surface alloys by diffusion
DE883386C (en) * 1940-06-09 1953-07-16 Mannesmann Huettenwerke A G Process for the production of diffusion coatings from chromium on iron or steel

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