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Patent Searching and Data


Title:
IONIC LIQUID FOR PICKLING STAINLESS STEEL AND METHOD FOR PICKLING STAINLESS STEEL BY USING SAME
Document Type and Number:
WIPO Patent Application WO/2021/101076
Kind Code:
A1
Abstract:
The present specification discloses an ionic liquid for pickling stainless steel, which is capable of rapidly removing oxide scale from stainless steel at room temperature without using nitric acid or hydrofluoric acid, and a method for pickling stainless steel by using same. A method for pickling stainless steel disclosed according to one embodiment comprises an electrolytic pickling treatment by immersing stainless steel in a pickling solution containing an ionic liquid comprising: at least one of an imidazolium cation, betainium cation, sulfonium cation, piperidinium cation, phosphonium cation, ammonium cation, pyridinium cation, pyrrolidinium cation, and morpholinium cation, as a cationic functional group; and at least one of a halide anion, sulfonate anion, alkyl sulfate anion, phosphinate anion, salicylate anion, nitrate anion, tetrafluoroborate anion, hexafluorophosphate anion, and bistripleimide anion, as an anionic functional group.

Inventors:
KIM JIN-SUK (KR)
LEE JAEJOON (KR)
KIM BYUNGKWON (KR)
Application Number:
PCT/KR2020/014199
Publication Date:
May 27, 2021
Filing Date:
October 16, 2020
Export Citation:
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Assignee:
POSCO (KR)
International Classes:
C25F1/14; C23G1/32
Foreign References:
KR20170053748A2017-05-16
KR20130047078A2013-05-08
KR101592147B12016-02-04
JPH07216600A1995-08-15
EP1538237B12009-09-30
DE3937438A11990-08-30
US5154774A1992-10-13
EP0236354A11987-09-16
US5908511A1999-06-01
US6554908B12003-04-29
Other References:
See also references of EP 4056737A4
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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