US20230059039A1 - Ionic liquid for pickling stainless steel and method for pickling stainless steel by using same - Google Patents
Ionic liquid for pickling stainless steel and method for pickling stainless steel by using same Download PDFInfo
- Publication number
- US20230059039A1 US20230059039A1 US17/777,907 US202017777907A US2023059039A1 US 20230059039 A1 US20230059039 A1 US 20230059039A1 US 202017777907 A US202017777907 A US 202017777907A US 2023059039 A1 US2023059039 A1 US 2023059039A1
- Authority
- US
- United States
- Prior art keywords
- anion
- cation
- pickling
- stainless steel
- ionic liquid
- 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
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
- C23G1/28—Cleaning or pickling metallic material with solutions or molten salts with molten salts
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/12—Pickling; Descaling in melts
- C25F1/14—Iron or steel
-
- 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
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/063—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors heterocyclic compounds
-
- 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
-
- 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
- C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
-
- 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
- C23G1/28—Cleaning or pickling metallic material with solutions or molten salts with molten salts
- C23G1/32—Heavy metals
Definitions
- a conventional pickling process is generally performed in two steps.
- a primary pickling step to remove oxide scale is conducted by immersing a stainless steel in a solution containing sodium sulfate electrolyte and applying a current thereto or by immersing the stainless steel in a salt bath containing sodium hydroxide and sodium nitrate at a high temperature of 400° C. or higher, and then a secondary pickling step is performed by using nitric acid or a mixed acid containing nitric acid and hydrofluoric acid at a high temperature of 80° C. or higher to obtain high surface quality and corrosion resistance by uniformly forming a passivated layer.
- nitric acid has effects on increasing the activity of hydrofluoric acid by lowering a pH in a pickling bath and maintaining an oxidation-reduction potential suitable for pickling by oxidizing ferrous cation (Fe 2+ ) dissolved on the surface of the steel sheet to ferric cation (Fe 3+ ).
- Patent Document 4 discloses a pickling method by using a pickling solution containing sulfuric acid, hydrofluoric acid, and ferric salt, periodically adding hydrogen peroxide, and adjusting a composition of a wetting agent, a polishing agent, and a corrosion inhibitor, wherein the pickling solution is automatically controlled based on Fe(III) and ORP thereby.
- CLEANOX352 as a pickling solution, has been commercialized and the most widely used worldwide. Although this method has been practically used for wire rods and hot-rolled products, manufacturing costs for products are higher than those of conventional products by 20% or more and the composition of the pickling solution and the control method are complex.
- the present disclosure has been proposed to solve the above-described problems, and provided is an ionic liquid for pickling stainless steel capable of rapidly removing oxide scale of stainless steel at room temperature without using nitric acid or hydrofluoric acid and method for pickling stainless steel by using the same.
- a method for pickling a stainless steel includes performing electrolytic pickling treatment by immersing a stainless steel in a pickling solution including an ionic liquid, wherein the ionic liquid includes 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 hexafluor
- the ionic liquid may be contained in the pickling solution in a concentration of 2 M or less.
- An ionic liquid for pickling a stainless steel may include 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.
- the present inventors have found that efficiency of pickling a stainless steel may be increased by adding an ionic liquid to a pickling solution.
- the ionic liquid according to the present disclosure may include 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 ani
- oxide scale of the stainless steel may be removed in an eco-friendly manner by adding the ionic liquid to the pickling solution without using nitric acid or hydrofluoric acid according to the present disclosure. Also, it was confirmed that the oxide scale of the stainless steel may be completely removed at a high speed within 1 minute by repeatedly applying a potential 5 times or less by immersing the stainless steel in the pickling solution at room temperature, rather than at a high temperature of 80° C. or higher according to the present disclosure. Also, it was confirmed that oxide scale may be removed by using a low concentration of the acidic solution or neutral solution, rather than a high concentration, in the pickling solution according to the present disclosure.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2019-0150288 | 2019-11-21 | ||
| KR1020190150288A KR102300834B1 (ko) | 2019-11-21 | 2019-11-21 | 스테인리스강 산세용 이온성 액체 및 이를 이용한 스테인리스강의 산세방법 |
| PCT/KR2020/014199 WO2021101076A1 (ko) | 2019-11-21 | 2020-10-16 | 스테인리스강 산세용 이온성 액체 및 이를 이용한 스테인리스강의 산세방법 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20230059039A1 true US20230059039A1 (en) | 2023-02-23 |
Family
ID=75981320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US17/777,907 Pending US20230059039A1 (en) | 2019-11-21 | 2020-10-16 | Ionic liquid for pickling stainless steel and method for pickling stainless steel by using same |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20230059039A1 (de) |
| EP (1) | EP4056737A4 (de) |
| KR (1) | KR102300834B1 (de) |
| CN (1) | CN114829682A (de) |
| WO (1) | WO2021101076A1 (de) |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5154774A (en) | 1985-09-19 | 1992-10-13 | Ugine Aciers De Chatillon Et Gueugnon | Process for acid pickling of stainless steel products |
| FR2587369B1 (fr) | 1985-09-19 | 1993-01-29 | Ugine Gueugnon Sa | Procede de decapage acide de produits en acier inoxydable |
| DE3937438C2 (de) | 1989-02-23 | 1998-01-29 | Wilfried Simmer | Verfahren zum Beizen von Stahl |
| IT1255655B (it) | 1992-08-06 | 1995-11-09 | Processo di decapaggio e passivazione di acciaio inossidabile senza impiego di acido nitrico | |
| JP3213833B2 (ja) * | 1994-01-31 | 2001-10-02 | ダイソー株式会社 | ステンレス鋼板の電解酸洗方法及びそれに使用される電極 |
| IT1312556B1 (it) | 1999-05-03 | 2002-04-22 | Henkel Kgaa | Processo di decapaggio di acciaio inossidabile in assenza di acidonitrico ed in presenza di ioni cloruro |
| EP1538237B1 (de) * | 2002-09-10 | 2009-09-30 | Nippon Mining & Metals Co., Ltd. | Verfahren zur metallabscheidung und vorbehandlungsmittel |
| WO2006088737A2 (en) * | 2005-02-14 | 2006-08-24 | Small Robert J | Semiconductor cleaning |
| WO2010052123A1 (en) * | 2008-11-05 | 2010-05-14 | Henkel Ag & Co. Kgaa | Ionic liquid composition for the removal of oxide scale |
| EP2440693B1 (de) * | 2009-06-08 | 2016-08-10 | Basf Se | Verwendung von ionischen flüssigkeiten zur vorbehandlung von kunststoffoberflächen zur metallisierung |
| KR101342359B1 (ko) * | 2011-10-31 | 2013-12-16 | 이병록 | 너트의 내측 표면처리 방법 |
| KR101359098B1 (ko) * | 2012-07-31 | 2014-02-12 | 주식회사 포스코 | 오스테나이트계 스테인리스 냉연강판을 제조하기 위한 고속 산세 프로세스 |
| KR101592147B1 (ko) * | 2015-08-19 | 2016-02-04 | 이대석 | 알루미늄 기판의 산화막 형성방법 |
| CN108505066A (zh) * | 2018-06-27 | 2018-09-07 | 东北大学 | 一种离子液体中高效电化学制备铝的方法 |
-
2019
- 2019-11-21 KR KR1020190150288A patent/KR102300834B1/ko active IP Right Grant
-
2020
- 2020-10-16 CN CN202080086975.4A patent/CN114829682A/zh active Pending
- 2020-10-16 US US17/777,907 patent/US20230059039A1/en active Pending
- 2020-10-16 EP EP20889474.1A patent/EP4056737A4/de active Pending
- 2020-10-16 WO PCT/KR2020/014199 patent/WO2021101076A1/ko unknown
Also Published As
| Publication number | Publication date |
|---|---|
| KR20210062272A (ko) | 2021-05-31 |
| CN114829682A (zh) | 2022-07-29 |
| EP4056737A4 (de) | 2023-01-11 |
| WO2021101076A1 (ko) | 2021-05-27 |
| KR102300834B1 (ko) | 2021-09-13 |
| EP4056737A1 (de) | 2022-09-14 |
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Legal Events
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| AS | Assignment |
Owner name: POSCO, KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, JIN-SUK;LEE, JAEJOON;KIM, BYUNGKWON;SIGNING DATES FROM 20220511 TO 20220512;REEL/FRAME:059954/0711 |
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| STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |