JPS54123529A - Pickling method for stainless steel - Google Patents

Pickling method for stainless steel

Info

Publication number
JPS54123529A
JPS54123529A JP3185778A JP3185778A JPS54123529A JP S54123529 A JPS54123529 A JP S54123529A JP 3185778 A JP3185778 A JP 3185778A JP 3185778 A JP3185778 A JP 3185778A JP S54123529 A JPS54123529 A JP S54123529A
Authority
JP
Japan
Prior art keywords
urea
pickling
acids
stainless steel
hydrofluoric
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.)
Pending
Application number
JP3185778A
Other languages
Japanese (ja)
Inventor
Terumi Oda
Kazuhito Kurachi
Ryohei Minami
Susumu Shintani
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.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP3185778A priority Critical patent/JPS54123529A/en
Publication of JPS54123529A publication Critical patent/JPS54123529A/en
Pending legal-status Critical Current

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
    • C23G1/08—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

PURPOSE:To enable hydrofluoric and nitric acids to elongate their life in pickling stainless steel by adding a specific amt. of urea to mixed acids based on hydrofluoric and nitric acids and carrying out pickling at a specific temp. to inhibit NH3-forming reaction and utilize the urea efficiently. CONSTITUTION:Urea is added to mixed acids based on hydrofluoric and nitric acids so that the molar ratio of urea to nitrous acid formed from the acids and Fe becomes below 1, and pickling is carried out at 20-50 deg.C. The concn. of urea in the pickling soln. is independent of descaling speed. When the molar ratio is above 1, NH3-forming reaction alone takes place according to the equation, so the acids are remarkably consumed and surface roughening of stainless steel occurs. In case the pickling temp. exceeds 50 deg.C, formation of a passive oxide film is prevented to increase stainless steel dissolving speed, thereby inducing surface roughening and raising urea decomposition rate. A pickling temp. below 20 deg.C requires long descaling time, Under the above conditions urea is utilized efficiently and consumption of hydrofluoric acid is reduced.
JP3185778A 1978-03-20 1978-03-20 Pickling method for stainless steel Pending JPS54123529A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3185778A JPS54123529A (en) 1978-03-20 1978-03-20 Pickling method for stainless steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3185778A JPS54123529A (en) 1978-03-20 1978-03-20 Pickling method for stainless steel

Publications (1)

Publication Number Publication Date
JPS54123529A true JPS54123529A (en) 1979-09-25

Family

ID=12342711

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3185778A Pending JPS54123529A (en) 1978-03-20 1978-03-20 Pickling method for stainless steel

Country Status (1)

Country Link
JP (1) JPS54123529A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS586980A (en) * 1981-07-06 1983-01-14 Nissan Chem Ind Ltd Nitric acid pickling solution for metal
US5338367A (en) * 1989-07-26 1994-08-16 Ugine, Aciers De Chatillon Et Gueugnon Pickling process in an acid bath of metallic products containing titanium or at least one chemical element of the titanium family

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS586980A (en) * 1981-07-06 1983-01-14 Nissan Chem Ind Ltd Nitric acid pickling solution for metal
US5338367A (en) * 1989-07-26 1994-08-16 Ugine, Aciers De Chatillon Et Gueugnon Pickling process in an acid bath of metallic products containing titanium or at least one chemical element of the titanium family

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