DE718870C - Process for the production of phosphate coatings on metals - Google Patents

Process for the production of phosphate coatings on metals

Info

Publication number
DE718870C
DE718870C DEM146089D DEM0146089D DE718870C DE 718870 C DE718870 C DE 718870C DE M146089 D DEM146089 D DE M146089D DE M0146089 D DEM0146089 D DE M0146089D DE 718870 C DE718870 C DE 718870C
Authority
DE
Germany
Prior art keywords
nitrite
production
metals
phosphate
phosphate 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
DEM146089D
Other languages
German (de)
Inventor
Wilfred James Clifford
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.)
GEA Group AG
Original Assignee
Metallgesellschaft 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 Metallgesellschaft AG filed Critical Metallgesellschaft AG
Application granted granted Critical
Publication of DE718870C publication Critical patent/DE718870C/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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/78—Pretreatment of the material to be coated

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Description

Verfahren zur Herstellung von Phosphatüberzügen auf Metallen Zusatz zum Patent 685 471 Das Hauptpatent betrifft ein Verfahren zur Herstellung von Phosphatüberzügen auf insbesondere Eisen und Stahl und besteht darin, vor der Behandlung mit einer Phosphat lösung, insbesondere solcher, die nitrathaltig ist, -den. zu schützenden Gegenstand mit einer nitrithaltigen Lösung vorzuspülen.Process for the production of phosphate coatings on metals additive to the patent 685 471 The main patent relates to a process for the production of phosphate coatings on iron and steel in particular and consists in prior treatment with a Phosphate solution, especially those containing nitrates, -den. to be protected Pre-rinse the object with a nitrite solution.

Beispielsweise wird eine vorzugsweise i bis 5 g Natriumnitrit pro Literenthaltende Lö, sang im Tauch- oder Spritzverfahren auf den zu behandelnden Gegenstand zur Einwirkung gebracht. Es können jedoch :auch andere Nitrite, z. B. Natriumkobaltinitrit oder organische Nitrite, verwendet werden.For example, a preferably 1 to 5 g sodium nitrite per Liters containing liters, sang in the immersion or spray process on the to be treated Object brought into action. However: also other nitrites, e.g. B. Sodium cobalt nitrite, or organic nitrites, can be used.

Es wurde nun gefunden, daß eine Vorspülung mit Nitrit besonders dann günstig ist, wenn die Phosphatüberzüge nicht im Tauchverfahren, wie es im Hauptpatent erwähnt ist, sondern im Spritzverfahren, insbesondere unter Verwendung von nitrathaltigen P'hosphatlösungen, aufgebracht werden sollen. Bei der Verwendung von nitrithaltigen Phosphatlösungen tritt insbesondere in Spritzverfahren oft eine Zersetzung des Nitrits ein, ehe es wirksam sein kann. Behandelt man jedoch die Gegenstände mit Nitritlösungen vor, so führt man gewissermaßen den wirksamen Stoff am Gegenstand :selbst in die Reaktion ein, so daß ef nicht, bevor @er wirksam werden kann, in der Phosphatlösung zersetzt werden kann. Eine Vorbehandlung mit Nitrit @ermöglicht also die Verwendung von nitritarmen oder -freien Phosphatlösungen mit den durch einen Nitritgehalt erzielbaren Vorteilen.It has now been found that pre-rinsing with nitrite is particularly useful in this case It is beneficial if the phosphate coatings are not dipped, as is the case in the main patent is mentioned, but in the spraying process, especially using nitrate-containing Phosphate solutions are to be applied. When using nitrite Phosphate solutions often cause the nitrite to decompose, especially in spray processes one before it can be effective. However, if the objects are treated with nitrite solutions before, so one introduces the active substance on the object, as it were: even into the Reaction on so that ef does not in the phosphate solution before @er can take effect can be decomposed. A pretreatment with nitrite @ enables the use of low-nitrite or nitrite-free phosphate solutions with those achievable through a nitrite content Benefits.

Claims (1)

PATENTANSPRUCH: Anwendung des Verfahrens nach Patent 685 q.71 in solchen Fällen, in denen die P'hosphatschicht durch Aufspritzen der P'hosphatlösung, vorzugsweise nitrathaltiger, hergestellt wird.PATENT CLAIM: Application of the method according to patent 685 q.71 in such Cases in which the phosphate layer by spraying the phosphate solution, preferably nitrate-containing, is produced.
DEM146089D 1938-09-26 1939-09-16 Process for the production of phosphate coatings on metals Expired DE718870C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB718870X 1938-09-26

Publications (1)

Publication Number Publication Date
DE718870C true DE718870C (en) 1942-03-24

Family

ID=10494813

Family Applications (1)

Application Number Title Priority Date Filing Date
DEM146089D Expired DE718870C (en) 1938-09-26 1939-09-16 Process for the production of phosphate coatings on metals

Country Status (1)

Country Link
DE (1) DE718870C (en)

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