ATE368758T1 - ECONOMICAL METHOD FOR RESTORING THE OXIDATION POTENTIAL OF A PICKLING SOLUTION - Google Patents

ECONOMICAL METHOD FOR RESTORING THE OXIDATION POTENTIAL OF A PICKLING SOLUTION

Info

Publication number
ATE368758T1
ATE368758T1 AT02807707T AT02807707T ATE368758T1 AT E368758 T1 ATE368758 T1 AT E368758T1 AT 02807707 T AT02807707 T AT 02807707T AT 02807707 T AT02807707 T AT 02807707T AT E368758 T1 ATE368758 T1 AT E368758T1
Authority
AT
Austria
Prior art keywords
iii
optimum
concentration
actual
weight ratio
Prior art date
Application number
AT02807707T
Other languages
German (de)
Inventor
Giorgio Cortellaro
Paolo Giordani
Ioannis Demertzis
Original Assignee
Henkel Kgaa
Thyssenkrupp Acciai Speciali
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 Henkel Kgaa, Thyssenkrupp Acciai Speciali filed Critical Henkel Kgaa
Application granted granted Critical
Publication of ATE368758T1 publication Critical patent/ATE368758T1/en

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
    • C23C22/34—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 fluorides or complex fluorides
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • C23G1/086—Iron or steel solutions containing HF
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/36—Regeneration of waste pickling liquors

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (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)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

A process for pickling and/or passivating stainless steel, wherein the stainless steel is brought into contact with an aqueous treatment solution with a pH value of 2.5 or below, which contains Fe(III) ions which are reduced to Fe(II) ions during pickling, wherein Fe(II) ions are re-oxidized continuously or discontnuously by the injection or oxygen gas or of a gas mixture containing more than 10 % by volume of oxygen gas, and wherein a non-gaseous oxidizing agent is additionally added to said aqueous treatment solution as long as either the actual Fe(III) concentration is by more than 3 g/l lower than the optimum Fe(III) concentration, or when the actual Fe(III)/Fe(II) weight ratio is by more than 0.15 lower than the optimum Fe(III)/Fe(II) weight ratio, and the addition of the non-gaseous oxidizing agent is terminated when either the actual Fe(III) concentration is equal to or higher than the optimum Fe(III) concentration, or when the actual Fe(III)/Fe(II) weight ratio is equal to or higher than the optimum Fe(III)/Fe(II) weight ratio.
AT02807707T 2002-08-30 2002-08-30 ECONOMICAL METHOD FOR RESTORING THE OXIDATION POTENTIAL OF A PICKLING SOLUTION ATE368758T1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2002/009730 WO2004020700A1 (en) 2002-08-30 2002-08-30 An economic method for restoring the oxidation potential of a pickling solution

Publications (1)

Publication Number Publication Date
ATE368758T1 true ATE368758T1 (en) 2007-08-15

Family

ID=31970239

Family Applications (1)

Application Number Title Priority Date Filing Date
AT02807707T ATE368758T1 (en) 2002-08-30 2002-08-30 ECONOMICAL METHOD FOR RESTORING THE OXIDATION POTENTIAL OF A PICKLING SOLUTION

Country Status (6)

Country Link
EP (1) EP1552038B1 (en)
AT (1) ATE368758T1 (en)
AU (1) AU2002333772A1 (en)
DE (1) DE60221584T2 (en)
ES (1) ES2292857T3 (en)
WO (1) WO2004020700A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1394958B1 (en) * 2009-02-17 2012-07-27 Condoroil Impianti Srl CATALYTIC OXIDATION PROCESS OF BIVALENT IRON WITH TRIVALENT IRON IN PICKLING BATHS FOR STAINLESS STEELS BASED ON CHLORIDRIC ACID AND / OR ITS BLENDS WITH OTHER ORGANIC AND INORGANIC ACIDS.
EP3771749A1 (en) * 2019-07-29 2021-02-03 Ewald Dörken Ag Method for passivating metallic substrates
JP7176137B2 (en) * 2020-01-09 2022-11-21 Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 Pickling method and pickling apparatus for steel plate
IT202000005848A1 (en) 2020-03-19 2021-09-19 Tenova Spa Process for pickling and / or passivating a stainless steel.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1243406B (en) * 1990-12-03 1994-06-10 Vittorio Degara System for oxidation of ferrous ions in nitric acid-free solutions for the surface pickling or passivation treatment of metal products
DE69612957T2 (en) * 1996-03-14 2001-09-06 Condoroil Impianti S R L Pickling of stainless steel with continuous catalytic oxidation of the pickling solution
DE19755350A1 (en) * 1997-12-12 1999-06-17 Henkel Kgaa Process for pickling and passivating stainless steel
IT1303814B1 (en) * 1998-12-02 2001-02-23 Henkel Kgaa APPARATUS AND METHOD TO CONTROL PERACCIAIO PICKLING PROCESSES.

Also Published As

Publication number Publication date
AU2002333772A1 (en) 2004-03-19
WO2004020700A1 (en) 2004-03-11
DE60221584D1 (en) 2007-09-13
DE60221584T2 (en) 2008-04-17
EP1552038A1 (en) 2005-07-13
ES2292857T3 (en) 2008-03-16
EP1552038B1 (en) 2007-08-01

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