IONIC LIQUID FOR PICKLING STAINLESS STEEL AND METHOD FOR PICKLING STAINLESS STEEL BY USING SAME

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:

KR20170053748A	2017-05-16
KR20130047078A	2013-05-08
KR101592147B1	2016-02-04
JPH07216600A	1995-08-15
EP1538237B1	2009-09-30
DE3937438A1	1990-08-30
US5154774A	1992-10-13
EP0236354A1	1987-09-16
US5908511A	1999-06-01
US6554908B1	2003-04-29

Other References: