ATE138423T1 - METHOD FOR PICKLING WORKPIECES MADE OF HIGH-ALLOYED MATERIALS AND DEVICE FOR IMPLEMENTING THE METHOD - Google Patents

METHOD FOR PICKLING WORKPIECES MADE OF HIGH-ALLOYED MATERIALS AND DEVICE FOR IMPLEMENTING THE METHOD

Info

Publication number
ATE138423T1
ATE138423T1 AT91250067T AT91250067T ATE138423T1 AT E138423 T1 ATE138423 T1 AT E138423T1 AT 91250067 T AT91250067 T AT 91250067T AT 91250067 T AT91250067 T AT 91250067T AT E138423 T1 ATE138423 T1 AT E138423T1
Authority
AT
Austria
Prior art keywords
acid
threshold value
mixed
specified threshold
nox
Prior art date
Application number
AT91250067T
Other languages
German (de)
Inventor
Klaus Pillmayer
Original Assignee
Mannesmann 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 Mannesmann Ag filed Critical Mannesmann Ag
Application granted granted Critical
Publication of ATE138423T1 publication Critical patent/ATE138423T1/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
    • 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
    • C23G1/10—Other heavy metals
    • 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

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)

Abstract

The invention relates to a process and a device for pickling workpieces of high-alloy materials in which the workpieces are immersed in a mixed-acid bath, or passed through a mixed-acid bath, consisting of nitric acid, hydrofluoric acid and water with amidosulphonic acid (NH2) HSO3 added as NOx acceptor. The invention is characterised in that the vaporous reaction products produced during pickling and containing nitrogen oxide components (NO, NO2) are sucked off in a known manner together with the room air in the intake region, the NOx component is continuously measured directly in the region in which the reaction products are produced and, if a specified threshold value for the NOx component is exceeded, a quantity of amidosulphonic acid in liquid form is added in excess to the mixed acid by the process control system and this procedure is repeated either if the specified threshold value is again exceeded or if at a specified time after completing the addition, the value actually measured for the NOx component is still above the specified threshold value. <IMAGE>
AT91250067T 1990-03-14 1991-03-12 METHOD FOR PICKLING WORKPIECES MADE OF HIGH-ALLOYED MATERIALS AND DEVICE FOR IMPLEMENTING THE METHOD ATE138423T1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4008567 1990-03-14

Publications (1)

Publication Number Publication Date
ATE138423T1 true ATE138423T1 (en) 1996-06-15

Family

ID=6402418

Family Applications (1)

Application Number Title Priority Date Filing Date
AT91250067T ATE138423T1 (en) 1990-03-14 1991-03-12 METHOD FOR PICKLING WORKPIECES MADE OF HIGH-ALLOYED MATERIALS AND DEVICE FOR IMPLEMENTING THE METHOD

Country Status (3)

Country Link
EP (1) EP0448189B1 (en)
AT (1) ATE138423T1 (en)
DE (1) DE59107828D1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1621608A1 (en) * 1967-01-31 1971-06-03 Kunststofftechnik Gmbh U Co Ve Method of trapping nitrogen oxides
JPS5782480A (en) * 1980-11-10 1982-05-22 Nissan Chem Ind Ltd Nitric acid pickling solution for metal
DE3412329A1 (en) * 1984-04-03 1985-10-10 Maschinenfabrik Andritz Ag, Graz Process for pickling alloy steels, copper, non-ferrous metal alloys, special alloys, titanium, zirconium, tantalum etc. by means of nitric-acid pickling baths
EP0259533A1 (en) * 1986-09-11 1988-03-16 Eka Nobel Aktiebolag Method of reducing the emission of nitrogen oxides from a liquid containing nitric acid

Also Published As

Publication number Publication date
EP0448189B1 (en) 1996-05-22
EP0448189A3 (en) 1993-07-14
EP0448189A2 (en) 1991-09-25
DE59107828D1 (en) 1996-06-27

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