Title (en)

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

Title (de)

IONISCHE FLÜSSIGKEIT ZUM BEIZEN VON ROSTFREIEM STAHL UND VERFAHREN ZUM BEIZEN VON ROSTFREIEM STAHL UNTER VERWENDUNG DERSELBEN

Title (fr)

LIQUIDE IONIQUE POUR DÉCAPAGE D'ACIER INOXYDABLE ET PROCÉDÉ DE DÉCAPAGE D'ACIER INOXYDABLE EN UTILISANT CELUI-CI

Publication

EP 4056737 A4 20230111 (EN)

Application

EP 20889474 A 20201016

Priority

• KR 20190150288 A 20191121
• KR 2020014199 W 20201016

Abstract (en)

[origin: EP4056737A1] Disclosed are an ionic liquid for pickling a stainless steel capable of rapidly removing oxide scale from the stainless steel at room temperature without using nitric acid or hydrofluoric acid and a method for pickling a stainless steel by using the same.The method for pickling a stainless steel according to an embodiment includes performing electrolytic pickling treatment by immersing a stainless steel in a pickling solution including an ionic liquid, wherein the ionic liquid comprises at least one of an imidazolium cation, a betainium cation, a sulfonium cation, a piperidinium cation, a phosphonium cation, an ammonium cation, a pyridium cation, a pyrrolidinium cation, and a morpholinium cation, as a cationic functional group, and at least one of a halide anion, a sulfonate anion, an alkylsulfate anion, a phosphinate anion, a salicylate anion, a nitrate anion, a tetrafluoroborate anion, a hexafluorophosphate anion, and a bistriflimide anion, as an anionic functional group.

IPC 8 full level

C25F 1/14 (2006.01); C23G 1/08 (2006.01); C23G 1/24 (2006.01); C23G 1/28 (2006.01); C23G 1/32 (2006.01); C25F 1/06 (2006.01)

CPC (source: EP KR US)

C23G 1/063 (2013.01 - US); C23G 1/08 (2013.01 - EP); C23G 1/24 (2013.01 - EP); C23G 1/28 (2013.01 - EP); C23G 1/32 (2013.01 - EP KR); C25F 1/14 (2013.01 - EP KR US)

Citation (search report)

• [XI] WO 2010052123 A1 20100514 - HENKEL AG & CO KGAA [DE], et al
• [X] CN 108505066 A 20180907 - UNIV NORTHEASTERN
• [X] WO 2006088737 A2 20060824 - SMALL ROBERT J [US]
• [XP] LEE JUNGEUN ET AL: "Electrochemical Descaling of Metal Oxides from Stainless Steel Using an Ionic Liquid-Acid Solution", ACS OMEGA, vol. 5, no. 25, 19 June 2020 (2020-06-19), US, pages 15709 - 15714, XP093003213, ISSN: 2470-1343, Retrieved from the Internet <URL:http://pubs.acs.org/doi/pdf/10.1021/acsomega.0c02163> [retrieved on 20221129], DOI: 10.1021/acsomega.0c02163
• [XI] KIM BYUNG-KWON ET AL: "Application of ionic liquids for metal dissolution and extraction", JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, vol. 61, 28 December 2017 (2017-12-28), KOREA, pages 388 - 397, XP093003138, ISSN: 1226-086X, DOI: 10.1016/j.jiec.2017.12.038
• [X] WHITEHEAD J A ET AL: "Comparative leaching of a sulfidic gold ore in ionic liquid and aqueous acid with thiourea and halides using Fe(III) or HSO"5^- oxidant", HYDROMETALLURGY, ELSEVIER SCIENTIFIC PUBLISHING CY. AMSTERDAM, NL, vol. 98, no. 3-4, 28 May 2009 (2009-05-28), pages 276 - 280, XP026224376, ISSN: 0304-386X, [retrieved on 20090528], DOI: 10.1016/J.HYDROMET.2009.05.012
• [X] VERMA CHANDRABHAN ET AL: "Ionic liquids as green and sustainable corrosion inhibitors for metals and alloys: An overview", JOURNAL OF MOLECULAR LIQUIDS, vol. 233, 2 March 2017 (2017-03-02), pages 403 - 414, XP029975527, ISSN: 0167-7322, DOI: 10.1016/J.MOLLIQ.2017.02.111
• See references of WO 2021101076A1

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

Designated validation state (EPC)

KH MA MD TN

DOCDB simple family (publication)

EP 4056737 A1 20220914; EP 4056737 A4 20230111; CN 114829682 A 20220729; KR 102300834 B1 20210913; KR 20210062272 A 20210531; US 2023059039 A1 20230223; WO 2021101076 A1 20210527

DOCDB simple family (application)

EP 20889474 A 20201016; CN 202080086975 A 20201016; KR 20190150288 A 20191121; KR 2020014199 W 20201016; US 202017777907 A 20201016