WO2002086199A3 - Continuous electrolytic descaling of stainless steel - Google Patents

Continuous electrolytic descaling of stainless steel Download PDF

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Publication number
WO2002086199A3
WO2002086199A3 PCT/IT2002/000270 IT0200270W WO02086199A3 WO 2002086199 A3 WO2002086199 A3 WO 2002086199A3 IT 0200270 W IT0200270 W IT 0200270W WO 02086199 A3 WO02086199 A3 WO 02086199A3
Authority
WO
WIPO (PCT)
Prior art keywords
anodic
outputted
current
electric charge
fraction
Prior art date
Application number
PCT/IT2002/000270
Other languages
French (fr)
Other versions
WO2002086199A2 (en
Inventor
Alessandro Dulcetti
Susanna Ramundo
Original Assignee
Ct Sviluppo Materiali Spa
Alessandro Dulcetti
Susanna Ramundo
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 Ct Sviluppo Materiali Spa, Alessandro Dulcetti, Susanna Ramundo filed Critical Ct Sviluppo Materiali Spa
Priority to AU2002304290A priority Critical patent/AU2002304290A1/en
Publication of WO2002086199A2 publication Critical patent/WO2002086199A2/en
Publication of WO2002086199A3 publication Critical patent/WO2002086199A3/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
    • C25F1/02—Pickling; Descaling
    • C25F1/04—Pickling; Descaling in solution
    • C25F1/06—Iron or steel

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

A continuous electrolytic method in an acid solution for the descaling of stainless steels, in the presence of electrolysis current flow indirect effects, said current being DC or AC, with a frequency lower than 3 Hz characterised in that the anodic treatment times and the cell currents are selected according to the formula It = c + kI where: I is the current density crossing the cell; t is the anodic treatment time; c is the constant fraction of electric charge density outputted for the direct oxide changing anodic reactions; and k is a time constant for the calculation of the fraction of electric charge quantity, proportional to the current density I (kI), outputted for the indirect anodic reaction linked to the oxidation of the hydroxyl ions of the water, that on the one hand produces and maintains the acidification at the steel/electrolytic solution interface, whereas on the other hand it substracts electric charges to the oxidation reactions of the scale and of the underlying metal.
PCT/IT2002/000270 2001-04-24 2002-04-24 Continuous electrolytic descaling of stainless steel WO2002086199A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002304290A AU2002304290A1 (en) 2001-04-24 2002-04-24 Continuous electrolytic descaling of stainless steel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001RM000223A ITRM20010223A1 (en) 2001-04-24 2001-04-24 METHOD FOR THE CONTINUOUS ELECTROLYTIC DESCRIPTION OF STAINLESS STEELS IN THE PRESENCE OF INDIRECT EFFECTS OF THE CURRENT PASSAGE.
ITRM2001A000223 2001-04-24

Publications (2)

Publication Number Publication Date
WO2002086199A2 WO2002086199A2 (en) 2002-10-31
WO2002086199A3 true WO2002086199A3 (en) 2004-03-04

Family

ID=11455493

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2002/000270 WO2002086199A2 (en) 2001-04-24 2002-04-24 Continuous electrolytic descaling of stainless steel

Country Status (3)

Country Link
AU (1) AU2002304290A1 (en)
IT (1) ITRM20010223A1 (en)
WO (1) WO2002086199A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1395853B1 (en) 2009-09-30 2012-10-26 Tenova Spa SURFACE PREPARATION GROUP FOR METALLIC TAPE PRODUCTION LINES
WO2013049103A1 (en) 2011-09-26 2013-04-04 Ak Steel Properties, Inc. Stainless steel pickling in an oxidizing, electrolytic acid bath
ITMI20130493A1 (en) * 2013-03-29 2014-09-30 Tenova Spa METHOD TO PROCESS THE SURFACE OF A STAINLESS STEEL LAMINATE IN A CONTINUOUS SOLFORIC ACID SOLUTION
MX2022006290A (en) * 2019-11-25 2022-06-09 Arcelormittal Electro-assisted pickling of steel.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999039028A1 (en) * 1998-02-02 1999-08-05 Avesta Sheffield Aktiebolag (Publ) Method for treating a metal product
WO2000015880A1 (en) * 1998-09-11 2000-03-23 Henkel Kommanditgesellschaft Auf Aktien Process for electrolytic pickling using nitric acid-free solutions
WO2002050344A1 (en) * 2000-12-18 2002-06-27 Centro Sviluppo Materiali S.P.A. Continuous electrolytic pickling and descaling of carbon steel and stainless

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999039028A1 (en) * 1998-02-02 1999-08-05 Avesta Sheffield Aktiebolag (Publ) Method for treating a metal product
WO2000015880A1 (en) * 1998-09-11 2000-03-23 Henkel Kommanditgesellschaft Auf Aktien Process for electrolytic pickling using nitric acid-free solutions
WO2002050344A1 (en) * 2000-12-18 2002-06-27 Centro Sviluppo Materiali S.P.A. Continuous electrolytic pickling and descaling of carbon steel and stainless

Also Published As

Publication number Publication date
ITRM20010223A0 (en) 2001-04-24
WO2002086199A2 (en) 2002-10-31
AU2002304290A1 (en) 2002-11-05
ITRM20010223A1 (en) 2002-10-24

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