FR2431554A1 - Electrolytic descaling of cold rolled stainless steel strip - which alternately forms the anode and cathode in both neutral sulphate bath and nitric acid bath - Google Patents

Electrolytic descaling of cold rolled stainless steel strip - which alternately forms the anode and cathode in both neutral sulphate bath and nitric acid bath

Info

Publication number
FR2431554A1
FR2431554A1 FR7821494A FR7821494A FR2431554A1 FR 2431554 A1 FR2431554 A1 FR 2431554A1 FR 7821494 A FR7821494 A FR 7821494A FR 7821494 A FR7821494 A FR 7821494A FR 2431554 A1 FR2431554 A1 FR 2431554A1
Authority
FR
France
Prior art keywords
soln
bath
anode
cathode
nitric acid
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
FR7821494A
Other languages
French (fr)
Other versions
FR2431554B3 (en
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.)
Ruthner Industrieanlagen AG
Original Assignee
Ruthner Industrieanlagen AG
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 Ruthner Industrieanlagen AG filed Critical Ruthner Industrieanlagen AG
Priority to FR7821494A priority Critical patent/FR2431554A1/en
Publication of FR2431554A1 publication Critical patent/FR2431554A1/en
Application granted granted Critical
Publication of FR2431554B3 publication Critical patent/FR2431554B3/fr
Granted 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

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

The strip is subjected to alternative anodic and cathodic treatment in an aq. soln. (I) of neutral alkali salts, e.g. Na2SO4 and K2SO4; followed by alternative anodic and cathodic treatment in an aq. soln. (II) of nitric acid. A central busbar system is pref. used to supply current for both solns. (I, II). The polarity of the strip is pref. the same at the inlet and exit of both baths. Soln. (I) pref. contains 100-250 g/l Na2SO4 at 50-80 degrees C., and is used for 0.5-2 minutes with an anode- and cathode- current density (ACCD) of 4-14 A/dm2. Soln. (II) is pref. at 50-75 degrees C and contains 5-20% HNO3, and ACCD being 3-15 A/dm2 used for 0.5-2 minutes. Used for stainless steels contg. min. 11% CR and possibly other alloying metals such as Ni and Mo, and avoids the use of HF in soln. (II). The process ensures complete removal of the residual scale.
FR7821494A 1978-07-20 1978-07-20 Electrolytic descaling of cold rolled stainless steel strip - which alternately forms the anode and cathode in both neutral sulphate bath and nitric acid bath Granted FR2431554A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7821494A FR2431554A1 (en) 1978-07-20 1978-07-20 Electrolytic descaling of cold rolled stainless steel strip - which alternately forms the anode and cathode in both neutral sulphate bath and nitric acid bath

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7821494A FR2431554A1 (en) 1978-07-20 1978-07-20 Electrolytic descaling of cold rolled stainless steel strip - which alternately forms the anode and cathode in both neutral sulphate bath and nitric acid bath

Publications (2)

Publication Number Publication Date
FR2431554A1 true FR2431554A1 (en) 1980-02-15
FR2431554B3 FR2431554B3 (en) 1981-03-27

Family

ID=9210939

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7821494A Granted FR2431554A1 (en) 1978-07-20 1978-07-20 Electrolytic descaling of cold rolled stainless steel strip - which alternately forms the anode and cathode in both neutral sulphate bath and nitric acid bath

Country Status (1)

Country Link
FR (1) FR2431554A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0059527A1 (en) * 1981-02-27 1982-09-08 Allegheny Ludlum Steel Corporation High current density, acid-free electrolytic descaling process
US4391685A (en) * 1981-02-26 1983-07-05 Republic Steel Corporation Process for electrolytically pickling steel strip material
US4612095A (en) * 1984-04-14 1986-09-16 Nippon Steel Corporation Method for improving corrosion resistance of bright annealed stainless steel
US4618379A (en) * 1982-09-21 1986-10-21 Roberto Bruno Method for the continuous annealing of steel strips
US5022971A (en) * 1988-09-14 1991-06-11 Maschinefabrik Andritz Actiengesellschaft Process for the electrolytic pickling of high-grade steel strip
EP0518850A1 (en) * 1991-06-10 1992-12-16 Andritz-Patentverwaltungs-Gesellschaft m.b.H. Process and device for electrolytic pickling of continuously moving electrically conducting articles
US5487820A (en) * 1993-12-23 1996-01-30 Hoechst Aktiengesellschaft Process for removing lead dioxide residues
CN102677140A (en) * 2012-05-04 2012-09-19 大连理工大学 Process for cleaning surfaces of stainless steel castings

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4391685A (en) * 1981-02-26 1983-07-05 Republic Steel Corporation Process for electrolytically pickling steel strip material
EP0059527A1 (en) * 1981-02-27 1982-09-08 Allegheny Ludlum Steel Corporation High current density, acid-free electrolytic descaling process
US4618379A (en) * 1982-09-21 1986-10-21 Roberto Bruno Method for the continuous annealing of steel strips
US4612095A (en) * 1984-04-14 1986-09-16 Nippon Steel Corporation Method for improving corrosion resistance of bright annealed stainless steel
US5022971A (en) * 1988-09-14 1991-06-11 Maschinefabrik Andritz Actiengesellschaft Process for the electrolytic pickling of high-grade steel strip
EP0518850A1 (en) * 1991-06-10 1992-12-16 Andritz-Patentverwaltungs-Gesellschaft m.b.H. Process and device for electrolytic pickling of continuously moving electrically conducting articles
US5382335A (en) * 1991-06-10 1995-01-17 Andritz-Patentverwaltungs-Gesellschaft M.B.H. Process and apparatus for the electrolytic treatment of continuously advancing electrically conductive material
US5487820A (en) * 1993-12-23 1996-01-30 Hoechst Aktiengesellschaft Process for removing lead dioxide residues
CN102677140A (en) * 2012-05-04 2012-09-19 大连理工大学 Process for cleaning surfaces of stainless steel castings

Also Published As

Publication number Publication date
FR2431554B3 (en) 1981-03-27

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