GB1242761A - Improvements in or relating to the removal of scale from scaled ferrous bodies - Google Patents

Improvements in or relating to the removal of scale from scaled ferrous bodies

Info

Publication number
GB1242761A
GB1242761A GB08554/69A GB1855469A GB1242761A GB 1242761 A GB1242761 A GB 1242761A GB 08554/69 A GB08554/69 A GB 08554/69A GB 1855469 A GB1855469 A GB 1855469A GB 1242761 A GB1242761 A GB 1242761A
Authority
GB
United Kingdom
Prior art keywords
scale
reference electrode
steel
april
scaled
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
GB08554/69A
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.)
Centro Sperimentale Metallurgico SpA
Original Assignee
Centro Sperimentale Metallurgico SpA
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 Centro Sperimentale Metallurgico SpA filed Critical Centro Sperimentale Metallurgico SpA
Publication of GB1242761A publication Critical patent/GB1242761A/en
Expired legal-status Critical Current

Links

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

1,242,761. Electrolytic pickling. CENTRO SPERIMENTALE METALLURGICO S.p.A. April 10, 1969 [April 12, 1968], No. 18554/69. Heading C7B. Scale is removed from a ferrous body, e.g. a hot-rolled austenitic, ferritic or martensitic steel sheet, immersed in an acid pickling solution 9 using a reference electrode 4 to control e.g. by a potentiostat 1 the P.D. between the body 5 and one or more counter-electrodes 7, 8 so that the potential of the body is maintained at a predetermined level, e.g. a value ranging from -150 to +150 mV with respect to a saturated calomel reference electrode, at which scale can be removed. For descaling a Cr-Ni stainless steel which is Cr-depleted under the scale, the P.D. between the steel body and the reference electrode is preferably maintained at a value affording a higher corrosion rate of the Cr-depleted alloy under the scale than that of the base steel. The pickling solution may contain one or more of HNO 3 , HF, HCl and H 2 SO 4 , and optionally an alkali metal or ammonium or iron salt.
GB08554/69A 1968-04-12 1969-04-10 Improvements in or relating to the removal of scale from scaled ferrous bodies Expired GB1242761A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1516768 1968-04-12

Publications (1)

Publication Number Publication Date
GB1242761A true GB1242761A (en) 1971-08-11

Family

ID=11146918

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08554/69A Expired GB1242761A (en) 1968-04-12 1969-04-10 Improvements in or relating to the removal of scale from scaled ferrous bodies

Country Status (6)

Country Link
BE (1) BE731296A (en)
FR (1) FR2006145A1 (en)
GB (1) GB1242761A (en)
LU (1) LU58417A1 (en)
NL (1) NL6905522A (en)
SE (1) SE365000B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0167087A1 (en) * 1984-07-04 1986-01-08 Hoechst Aktiengesellschaft Process for the electrochemical roughening of steel plates for use as supports for off-set printing plates, as well as an electrolytic solution suitable for the process
GB2296502A (en) * 1994-12-23 1996-07-03 Cathelco Ltd Electrolytic descaling ships ballast tanks prior to painting
EP2094880A1 (en) * 2007-02-12 2009-09-02 Henkel AG & Co. KGaA Process for treating metal surfaces

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0167087A1 (en) * 1984-07-04 1986-01-08 Hoechst Aktiengesellschaft Process for the electrochemical roughening of steel plates for use as supports for off-set printing plates, as well as an electrolytic solution suitable for the process
US4614571A (en) * 1984-07-04 1986-09-30 Hoechst Aktiengesellschaft Process for electrochemically graining steel plates used as offset printing plate supports, and an electrolyte solution suitable for the process
GB2296502A (en) * 1994-12-23 1996-07-03 Cathelco Ltd Electrolytic descaling ships ballast tanks prior to painting
EP2094880A1 (en) * 2007-02-12 2009-09-02 Henkel AG & Co. KGaA Process for treating metal surfaces
EP2094880A4 (en) * 2007-02-12 2011-08-17 Henkel Ag & Co Kgaa Process for treating metal surfaces
US9234283B2 (en) 2007-02-12 2016-01-12 Henkel Ag & Co. Kgaa Process for treating metal surfaces

Also Published As

Publication number Publication date
BE731296A (en) 1969-09-15
SE365000B (en) 1974-03-11
NL6905522A (en) 1969-10-14
FR2006145A1 (en) 1969-12-19
DE1918514B2 (en) 1975-11-13
LU58417A1 (en) 1969-07-21
DE1918514A1 (en) 1969-10-30

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