EP0602347A1 - Procédé pour le balayage et le reconditionnement de systèmes de transfert - Google Patents

Procédé pour le balayage et le reconditionnement de systèmes de transfert Download PDF

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Publication number
EP0602347A1
EP0602347A1 EP93116941A EP93116941A EP0602347A1 EP 0602347 A1 EP0602347 A1 EP 0602347A1 EP 93116941 A EP93116941 A EP 93116941A EP 93116941 A EP93116941 A EP 93116941A EP 0602347 A1 EP0602347 A1 EP 0602347A1
Authority
EP
European Patent Office
Prior art keywords
purge gas
corrosive
transfer systems
oxygen
media
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.)
Granted
Application number
EP93116941A
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German (de)
English (en)
Other versions
EP0602347B1 (fr
Inventor
Manfred Dr. Eschwey
Ulrich Klebe
Jürgen Dr. Schram
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.)
Messer Griesheim GmbH
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Messer Griesheim GmbH
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Filing date
Publication date
Application filed by Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Publication of EP0602347A1 publication Critical patent/EP0602347A1/fr
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Publication of EP0602347B1 publication Critical patent/EP0602347B1/fr
Anticipated expiration legal-status Critical
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    • 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
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising

Definitions

  • the invention relates to a method for rinsing and reconditioning transfer systems for corrosive media made of passivable materials.
  • these are steels with an austenitic structure such as austenitic stainless steels or austenitic structure components, such as austenite ferrites or CrNi alloys, CuNi alloys or the like, whose limited resistance to corrosive media is solely due to the formation of dense, homogeneous passive layers of approx 10um is based.
  • this layer is at least covered with a monomolecular water layer (Fig. 2/1). If this layer comes into contact with dry gaseous hydrogen chloride, this water layer is first removed. The driving force behind this reaction is the enormous hydration tendency of HCI. The original, pure oxide passive layer is then converted into a mixture of metal chlorides and oxides. The iron and chromium oxides are only kinetically not thermodynamically stable with respect to the corrosive medium HCI, especially with a high HCI excess. This process, which takes place in the absence of oxygen, is called acid corrosion (Fig. 2/11). The resulting metal halide layer prevents further dissolution of the metal. However, if the transfer system or parts of it have to be flushed (e.g.
  • the invention is therefore based on the object of providing a method for rinsing and reconditioning transfer systems for corrosive media from passivatable materials, which makes it possible to increase the service life of the transfer systems and to reduce the contamination of the media.
  • the metal halide is converted into the corresponding hydroxide by means of the water vapor.
  • the halogen hydrogen formed is removed by hydrate formation.
  • the hydroxide is then converted into a stable passive oxide layer using dry oxygen or ozone.
  • the preferred ranges for the admixtures 0 2 range from 0.1% to 100% and / or from 0 3 from 0.1 to 100 g / m 3 and / or from water vapor from 10 ppm to 100%.
  • the metal halide surfaces can be reconditioned using a one- or two-stage procedure:
  • a perfectly passivated and dried surface of an austenitic material consists of a dense, very thin, homogeneous metal oxide layer that is covered with a monomolecular water layer at approx. 200 ° C (Fig. 1/1).
  • a dry, gaseous, halide-containing corrosive medium this layer of water is first removed.
  • the driving force behind this reaction is the tendency towards hydration of halide-containing corrosive media.
  • the original, purely oxide passive layer is then converted into a mixture of metal halides and oxides (Fig. 11/11). The resulting metal halide layer prevents further dissolution of the metal.
  • the metal halides are converted into the corresponding hydroxides.
  • the hydrogen halide formed is removed by hydrate formation (Fig. 1/111).
  • a shiny metallic surface is formed.
  • Repassivation is carried out by flushing with a gas mixture which, in addition to an inert carrier gas, contains a gaseous oxidizing agent such as oxygen or ozone.
  • the hydroxides are largely converted into the more stable oxides of the respective metal (Fig. 2 / IV).
  • the metal halide surface of a passivatable material is reconditioned.
  • a purge gas containing oxygen and water vapor e.g. 20% 0 2 ; 100ppm H 2 0
  • the metal halides are converted into the corresponding hydroxides
  • the hydrogen halide formed is removed by hydrate formation and the hydroxides are converted into oxides of the respective metal. Due to the simultaneous surface reaction, the two-step process described in embodiment 1 is advantageously replaced by a one-step process.
  • the purge gas contains a gaseous oxidizing agent, such as oxygen or ozone, which is also capable of oxidizing the metal halides directly.
  • a gaseous oxidizing agent such as oxygen or ozone

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP93116941A 1992-12-18 1993-10-20 Procédé pour le balayage et le reconditionnement de systèmes de transfert Expired - Lifetime EP0602347B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4242967A DE4242967A1 (de) 1992-12-18 1992-12-18 Verfahren zum Spülen und Rekonditionieren von Transfersystemen
DE4242967 1992-12-18

Publications (2)

Publication Number Publication Date
EP0602347A1 true EP0602347A1 (fr) 1994-06-22
EP0602347B1 EP0602347B1 (fr) 1997-05-14

Family

ID=6475770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93116941A Expired - Lifetime EP0602347B1 (fr) 1992-12-18 1993-10-20 Procédé pour le balayage et le reconditionnement de systèmes de transfert

Country Status (3)

Country Link
EP (1) EP0602347B1 (fr)
AT (1) ATE153081T1 (fr)
DE (2) DE4242967A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003015944A1 (fr) * 2001-08-17 2003-02-27 Exxonmobil Research And Engineering Company Extension de duree d'utilisation de four par une lutte contre l'encrassement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4475958A (en) * 1981-11-13 1984-10-09 M.A.N. Maschinenfabrik Augsburg-Nurnberg Aktiengesellchaft Method for the manufacture of deformation resistant oxidic protective layers
EP0168609A1 (fr) * 1984-06-15 1986-01-22 International Business Machines Corporation Procédé pour réparer des trous de rupture se trouvant dans des couches diélectriques
EP0504621A1 (fr) * 1991-03-18 1992-09-23 Urea Casale S.A. Méthode pour la passivation de surfaces de métaux attaquées par des conditions opérationelles et des agents favorisant la corrosion
EP0512782A1 (fr) * 1991-05-03 1992-11-11 The Boc Group, Inc. Procédé de passivation de la surface d'un acier inoxydable

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02179867A (ja) * 1988-12-29 1990-07-12 Tadahiro Omi プロセスガス供給システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4475958A (en) * 1981-11-13 1984-10-09 M.A.N. Maschinenfabrik Augsburg-Nurnberg Aktiengesellchaft Method for the manufacture of deformation resistant oxidic protective layers
EP0168609A1 (fr) * 1984-06-15 1986-01-22 International Business Machines Corporation Procédé pour réparer des trous de rupture se trouvant dans des couches diélectriques
EP0504621A1 (fr) * 1991-03-18 1992-09-23 Urea Casale S.A. Méthode pour la passivation de surfaces de métaux attaquées par des conditions opérationelles et des agents favorisant la corrosion
EP0512782A1 (fr) * 1991-05-03 1992-11-11 The Boc Group, Inc. Procédé de passivation de la surface d'un acier inoxydable

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003015944A1 (fr) * 2001-08-17 2003-02-27 Exxonmobil Research And Engineering Company Extension de duree d'utilisation de four par une lutte contre l'encrassement
US6648988B2 (en) 2001-08-17 2003-11-18 Exxonmobil Research And Engineering Company Furnace run length extension by fouling control
AU2002322602B2 (en) * 2001-08-17 2007-02-15 Exxonmobil Research And Engineering Company Furnace run length extension by fouling control

Also Published As

Publication number Publication date
DE4242967A1 (de) 1994-06-23
DE59306445D1 (de) 1997-06-19
ATE153081T1 (de) 1997-05-15
EP0602347B1 (fr) 1997-05-14

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