DE3835393A1 - Process for the chemical treatment of metal components - Google Patents

Process for the chemical treatment of metal components

Info

Publication number
DE3835393A1
DE3835393A1 DE19883835393 DE3835393A DE3835393A1 DE 3835393 A1 DE3835393 A1 DE 3835393A1 DE 19883835393 DE19883835393 DE 19883835393 DE 3835393 A DE3835393 A DE 3835393A DE 3835393 A1 DE3835393 A1 DE 3835393A1
Authority
DE
Germany
Prior art keywords
ions
chromic acid
acid solution
temperature
metal components
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.)
Withdrawn
Application number
DE19883835393
Other languages
German (de)
Inventor
Renate Rittig
Werner Dr Rer Nat Katzung
Peter Dr Ing Peissker
Gabriele Dipl Ing Zimmermann
Andreas Dipl Ing Gelhaar
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.)
METALLEICHTBAU VEB K
Original Assignee
METALLEICHTBAU VEB K
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 METALLEICHTBAU VEB K filed Critical METALLEICHTBAU VEB K
Publication of DE3835393A1 publication Critical patent/DE3835393A1/en
Withdrawn legal-status Critical Current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
    • C23C22/05—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 using aqueous solutions
    • C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/24—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds
    • C23C22/30—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds containing also trivalent chromium
    • 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
    • C23C22/73—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 characterised by the process

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)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

A process for the chemical treatment of metal components preferably consisting of ferrous materials in a chromic acid solution before metallising by melt immersion, in particular before melt immersion aluminising. The treatment takes place between the cleaning of the surface and the melt immersion metallising in order to ensure and improve the wettability. The metal components, cleaned according to known processes up to the "metallically clean" state, are immersed for at least 60 seconds at a temperature of 310...355 K in a chromic acid solution having the parameters 3...45 g/l of CrO3, at least 0.06 g/l of Cr<3+> ions and at least 0.04 g/l of Fe<3+> ions and dried at a temperature of at least 350 K.

Description

Anwendungsgebiet der ErfindungField of application of the invention

Die Erfindung betrifft ein Verfahren zur chemischen Behandlung von Metallteilen aus vorzugsweise Eisenwerkstoffen in einer Chromsäurelösung vor dem Schmelztauchmetallisieren, insbesondere dem Schmelztauchaluminieren. Diese Behandlung erfolgt zwischen der Reinigung der Oberfläche und dem Schmelztauchmetallisieren zur Sicherung und Verbesserung der Benetzungsfähigkeit.The invention relates to a method for chemical treatment of metal parts of preferably iron materials in a chromic acid solution prior to hot dip metallizing, especially the hot dip aluminizing. This treatment takes place between the cleaning of the surface and the hot dip metallizing for securing and improving wetting ability.

Charakteristik der bekannten technischen LösungenCharacteristic of the known technical solutions

Es ist bekannt, daß Metallteile, die einen Schutzüberzug durch Schmelztauchmetallisierung erhalten sollen, metallisch rein sein müssen und zur Erhöhung der Benetzungsfähigkeit mit der Metallschmelze einer gesonderten chemischen Behandlung unterzogen werden müssen.It is known that metal parts that have a protective coating To receive hot dip metallization, metallic pure and to increase the wetting ability with the Molten metal subjected to a separate chemical treatment Need to become.

Bekannt ist unter anderem, vor Schmelztauchprozessen Metallteile in Chromsäurelösungen zu behandeln. So ist aus dem DD-PS 2 23 730 ein Verfahren zum Tauchaluminieren bekannt. Mit dieser Erfindung werden Erzeugnisse aus Eisen und seinen Legierungen mit gereinigter Oberfläche in einer Lösung aus Chromsäureanhydrid getaucht, danach in Wasser gespült und in eine erwärmte Natriumtetraboratlösung eingebracht, anschließend getrocknet und dem Bad mit geschmolzenen Aluminium zugeführt. Die Anwendung des Verfahrens ist zwar möglich, aber die erreichte Qualität der Aluminiumschutzschicht instabil und damit eine industrielle Anwendung nicht vertretbar.It is known inter alia, before Schmelztauchprozessen metal parts in chromic acid solutions. So is from the DD-PS 2 23 730 a method for Tauchaluminieren known. With This invention relates to products of iron and its alloys with a cleaned surface in a solution of chromic anhydride dipped, then rinsed in water and into a heated sodium tetraborate solution introduced, then dried and fed to the bath with molten aluminum. The application of the method is possible, but the achieved Quality of the aluminum protective layer unstable and thus a industrial application unreasonable.

Ziel der ErfindungObject of the invention

Die Erfindung hat das Ziel, das Verfahren zur chemischen Behandlung für die Schmelztauchmetallisierung so zu gestalten, daß durch Sicherung und Verbesserung der Benetzungsfähigkeit der Metallteile gegenüber der Schmelze stabile Qualitätsparameter der Metallschutzschichten erreicht werden. The invention has the object, the method of chemical treatment for the hot dip metallization so that by securing and improving the wetting ability of the Metal parts against the melt stable quality parameters of Metal protective layers can be achieved.  

Darlegung des Wesens der ErfindungExplanation of the essence of the invention

Es ist Aufgabe der Erfindung, das Verfahren so stabil zu gestalten, daß die beim industriemäßigen Schmelztauchmetallisieren von nach bekanntem Stand der Technik chemisch behandelten Metallteile entstehenden Schutzschichten den technischen Normen entsprechen.It is an object of the invention to the method so stable make that metallizing in industrial Schmelztauchmetallisieren of chemically treated according to the prior art Metal parts resulting protective coatings technical Comply with standards.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß die Metallteile, deren Oberfläche nach an sich bekanntem Verfahren zum Zustand "metallisch rein" gereinigt, in eine Chromsäurelösung mit den ParameternAccording to the invention the object is achieved in that the metal parts, the surface of which is known per se to the state "pure metallic" cleaned, in a chromic acid solution with the parameters

3 . . . 45 g/l CrO₃
mindestens 0,06 g/l Cr3+-Ionen
mindestens 0,04 g/l Fe3+-Ionen3. , , 45 g / l CrO₃
at least 0.06 g / L Cr 3+ ions
at least 0.04 g / l Fe 3+ ions

bei einer Temperatur von 310 . . . 355 K mindestens 60 sec getaucht und bei einer Temperatur von mindestens 350 K getrocknet werden. Die Konzentration der Cr3+- und Fe3+-Ionen der frisch angesetzten Chromsäurelösung kann durch chemische Umsetzung von Metallteilen aus unlegiertem oder niedriglegiertem Stahl mit der Lösung erreicht werden, oder bei Neuansatz der Chromsäurelösung anteilig bereits verwendeter Lösung zugesetzt werden. at a temperature of 310. , , 355 K immersed for at least 60 seconds and dried at a temperature of at least 350 K. The concentration of the Cr 3+ and Fe 3+ ions of the freshly prepared chromic acid solution can be achieved by chemical reaction of metal parts of unalloyed or low-alloyed steel with the solution, or in the case of a new batch of the chromic acid solution proportionately already used solution can be added.

Ausführungsbeispieleembodiments

Anhand von Ausführungsbeispielen soll die Erfindung näher erläutert werden.With reference to embodiments, the invention is intended to be closer be explained.

Beispiel 1Example 1

Die Metallteile, deren Oberfläche zum Zustand "metallisch rein" gesäubert wurde, werden in eine Chromsäurelösung, deren Konzentration an Cr3+- und Fe3+-Ionen durch chemische Reaktion von Eisenwerkstoff mit der Behandlungslösung entsteht, folgender Zusammensetzung getaucht:The metal parts, the surface of which has been cleaned to a "metallically pure" state, are immersed in a chromic acid solution whose concentration of Cr 3+ and Fe 3+ ions is formed by chemical reaction of iron material with the treatment solution, of the following composition:

4,0 g/l CrO₃
0,25 g/l Cr3+-Ionen
0,14 g/l Fe3+-Ionen4.0 g / l CrO₃
0.25 g / l Cr 3+ ions
0.14 g / l Fe 3+ ions

Temperatur der Lösung:|323 KTemperature of the solution: | 323 K Tauchzeit:Dive time: 270 s270 s Trockentemperatur:Dry Temperature: 360 K360K

Beispiel 2example 2

Die nach Beispiel 1 vorbehandelten Metallteile werden in eine Chromsäurelösung mitThe pretreated according to Example 1 metal parts are in a Chromic acid solution with

10,0 g/l CrO₃ getaucht.
Die Konzentration von
0,15 g/l Cr3+-Ionen und
0,04 g/l Fe3+-Ionen10.0 g / l CrO₃ dipped.
The concentration of
0.15 g / l Cr 3+ ions and
0.04 g / l Fe 3+ ions

wird durch den Zusatz eines äquivalenten Anteiles einer bereits verwendeten Behandlungslösung erreicht.becomes by the addition of an equivalent portion one already used treatment solution.

Temperatur der Lösung:|310 KTemperature of the solution: | 310 K Tauchzeit:Dive time: 90 s90 s Trockentemperatur:Dry Temperature: 375 K375 K

Claims (3)

1. Verfahren zur chemischen Behandlung von Metallteilen aus vorzugsweise Eisenwerkstoffen in einer Chromsäurelösung vor der Schmelztauchmetallisierung, dadurch gekennzeichnet, daß die Metallteile mit einer metallisch reinen Oberfläche in eine Lösung mit den Parametern 3 . . . 45 g/l CrO₃
mindestens 0,06 g/l Cr3+-Ionen
mindestens 0,04 g/l Fe3+-Ionenbei einer Temperatur von 310 . . . 355 K mindestens 60 sec getaucht und bei einer Temperatur von mindestens 350 K getrocknet werden.1. A process for the chemical treatment of metal parts of preferably iron materials in a chromic acid solution before the hot dipped metallization, characterized in that the metal parts with a metallically pure surface in a solution with the parameters. 3 , , 45 g / l CrO₃
at least 0.06 g / L Cr 3+ ions
at least 0.04 g / L Fe 3+ ions at a temperature of 310. , , 355 K immersed for at least 60 seconds and dried at a temperature of at least 350 K. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Konzentration an Cr3+- und Fe3+-Ionen durch chemische Reaktion von Eisenwerkstoffen mit der angesetzten Chromsäurelösung erreicht wird.2. The method according to claim 1, characterized in that the concentration of Cr 3+ - and Fe 3+ -ions is achieved by chemical reaction of iron materials with the prepared chromic acid solution. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß bei Neuansatz der Chromsäurelösung anteilig bereits verwendete Lösung zugesetzt wird.3. The method according to claim 1, characterized in that at New batch of chromic acid solution proportionally already used Solution is added.
DE19883835393 1988-03-14 1988-10-18 Process for the chemical treatment of metal components Withdrawn DE3835393A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD31365888A DD270092A1 (en) 1988-03-14 1988-03-14 METHOD FOR THE CHEMICAL TREATMENT OF METAL PARTS

Publications (1)

Publication Number Publication Date
DE3835393A1 true DE3835393A1 (en) 1989-09-28

Family

ID=5597621

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19883835393 Withdrawn DE3835393A1 (en) 1988-03-14 1988-10-18 Process for the chemical treatment of metal components

Country Status (8)

Country Link
JP (1) JPH01290777A (en)
BE (1) BE1001732A6 (en)
DD (1) DD270092A1 (en)
DE (1) DE3835393A1 (en)
FR (1) FR2628443A1 (en)
NL (1) NL8802867A (en)
PL (1) PL278173A1 (en)
SE (1) SE8803881A0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999032683A1 (en) * 1997-12-19 1999-07-01 Sms Demag Ag Method for producing a strip-like metal composite by high temperature dip coating

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999032683A1 (en) * 1997-12-19 1999-07-01 Sms Demag Ag Method for producing a strip-like metal composite by high temperature dip coating
US6436556B1 (en) * 1997-12-19 2002-08-20 Sms Demag Ag Method for producing a strip-like metal composite by high temperature dip coating

Also Published As

Publication number Publication date
NL8802867A (en) 1989-10-02
BE1001732A6 (en) 1990-02-20
SE8803881A0 (en) 1989-09-15
SE8803881A (en) 1988-10-28
DD270092A1 (en) 1989-07-19
FR2628443A1 (en) 1989-09-15
PL278173A1 (en) 1989-12-11
JPH01290777A (en) 1989-11-22
SE8803881D0 (en) 1988-10-28

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8139 Disposal/non-payment of the annual fee