KR970074980A - Hydrogen Peroxide Pickling in Stainless Steel - Google Patents

Hydrogen Peroxide Pickling in Stainless Steel Download PDF

Info

Publication number
KR970074980A
KR970074980A KR1019970020297A KR19970020297A KR970074980A KR 970074980 A KR970074980 A KR 970074980A KR 1019970020297 A KR1019970020297 A KR 1019970020297A KR 19970020297 A KR19970020297 A KR 19970020297A KR 970074980 A KR970074980 A KR 970074980A
Authority
KR
South Korea
Prior art keywords
strip
scale
inorganic acid
hydrogen peroxide
aqueous solution
Prior art date
Application number
KR1019970020297A
Other languages
Korean (ko)
Other versions
KR100492841B1 (en
Inventor
디. 로다바우 로날드
더블류. 리커 제랄드
Original Assignee
어니스트 제이. 블라체
암코 인크.
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
Priority claimed from US08/667,498 external-priority patent/US5702534A/en
Priority claimed from US08/821,154 external-priority patent/US5743968A/en
Application filed by 어니스트 제이. 블라체, 암코 인크. filed Critical 어니스트 제이. 블라체
Publication of KR970074980A publication Critical patent/KR970074980A/en
Application granted granted Critical
Publication of KR100492841B1 publication Critical patent/KR100492841B1/en

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23GCLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08Iron or steel
    • C23G1/081Iron or steel solutions containing H2SO4
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23GCLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08Iron or steel

Abstract

본 발명은 과산화수소와 무기산, 즉 염산 또는 황산을 함유한 수용액을 이용하여 스테인레스강으로부터 스케일을 제거하는 공정에 관한 것이다. 열간 가공 또는 어닐링 가공되어 스케일로 덮여진 스테인레스강 스트립(10)은 피클링 탱크(12, 14)내에 함유된 무기산에 침지된다. 그 이후에, 스트립은 견고하게 점착된 스케일(11)의 잔류량을 갖는다. 이러한 스케일은 스트립 상에서 전적으로 횡방향으로 연장되어 위치된 또 다른 스프레이헤더(18)와 같은 것에 의해 스트립에 가해진 과산화수소 및 무기산을 함유한 수용액에 의해 활성화된다. 스케일을 스트립으로부터 완전히 제거하기 위해 활성화된 스트립을 고온 무기산을 통해 다시 통과시키고 스티립을 고속의 라인 속도로 재활성시키는 것이 바람직할 수 있다. 스트립으로부터 적하된 과산화수소 스프레이는 캐치팬(30) 상에 수집되어 탱크(28)로 유동된다. 양호하게는, 무기산과 소비된 과산화수소를 함유한 수집 소비된 수용액은 피클링 탱크 내에 배치된다. 수용액은 스트립 상에 남아 있는 잔류 스케일과 얼룩의 제거에 도움이 되고, 피클링된 스트립의 무결성을 개선시킨다.The present invention relates to a process for removing scale from stainless steel using an aqueous solution containing hydrogen peroxide and inorganic acids, ie hydrochloric acid or sulfuric acid. The stainless steel strip 10, which is hot worked or annealed and covered with scale, is immersed in the inorganic acid contained in the pickling tanks 12, 14. After that, the strip has a residual amount of firmly adhered scale 11. This scale is activated by an aqueous solution containing hydrogen peroxide and inorganic acid applied to the strip, such as by another spray header 18 positioned entirely transversely on the strip. In order to completely remove the scale from the strip, it may be desirable to pass the activated strip back through the hot inorganic acid and to reactivate the styrip at a high line speed. The hydrogen peroxide spray dropped from the strip is collected on the catch pan 30 and flows to the tank 28. Preferably, the collected spent aqueous solution containing inorganic acid and spent hydrogen peroxide is placed in the pickling tank. The aqueous solution helps to remove residual scale and stains remaining on the strip and improves the integrity of the pickled strip.

Description

스테인레스강의 과산화수소 피클링Hydrogen Peroxide Pickling in Stainless Steel

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 본 발명의 공정을 실시하는 피클링 라인을 도시하는 개략도.1 is a schematic diagram showing a pickling line for carrying out the process of the present invention.

Claims (20)

크롬을 함유한 제1철 합금으로부터 스케일을 제거하는 공정에 있어서, 스케일로 엎여진 크롬을 함유한 제1철 합금 스트립을 제공하는 단계와, 스케일을 분해하도록 스트립을 전처리하는 단계와, 분해된 스케일을 제거하도록 염산 및 황산으로 구성된 그룹으로부터 하나의 무기산을 내장한 하나 이상의 피클링 탱크에 전처리된 스티립을 침지시키는 단계와, 스트립 상의 잔류 스케일이 과산화수소에 의해 활성화되고 무기산에 의해 제거됨으로써 순수한 스트립 형성하게 되도록, 과산화수소를 함유한 수용액을 피클링된 스트립에 가하는 단계를 포함하는 것을 특징으로 하는 공정.A process for removing a scale from a ferrous alloy containing chromium, comprising the steps of: providing a ferrous alloy strip containing chromium overlying the scale, pretreating the strip to disintegrate the scale, and degrading the scale. Immersing the pretreated styrene in one or more pickling tanks containing one inorganic acid from the group consisting of hydrochloric acid and sulfuric acid to remove chlorine, and the residual scale on the strip is activated by hydrogen peroxide and removed by inorganic acid to form a pure strip. Adding an aqueous solution containing hydrogen peroxide to the pickled strip. 제1항에 있어서, 상기 수용액을 10g/ℓ이상의 과산화수소를 함유하는 것을 특징으로 하는 공정.The process according to claim 1, wherein the aqueous solution contains 10 g / l or more hydrogen peroxide. 제1항에 있어서, 상기 수용액은 잔류 스케일을 제거하기 위한 무기산을 함유하는 것을 특징으로 하는 공정.The process of claim 1 wherein the aqueous solution contains an inorganic acid for removing residual scale. 제3항에 있어서, 상기 수용액은 5g/ℓ이상의 무기산을 함유하는 것을 특징으로 하는 공정.4. The process according to claim 3, wherein the aqueous solution contains at least 5 g / l of inorganic acid. 제3항에 있어서, 상기 수용액은 20g/ℓ이상의 무기산을 함유하고 25g/ℓ이상의 과산화수소를 함유하는 것을 특징으로 하는 공정.4. A process as claimed in claim 3, wherein the aqueous solution contains at least 20 g / l of inorganic acid and at least 25 g / l of hydrogen peroxide. 제5항에 있어서, 스케일을 활성화한 후에 상기 수용액이 피클링 탱크에 처치되는 것을 특징으로 하는 공정.6. The process according to claim 5, wherein the aqueous solution is treated in a pickling tank after activating the scale. 제5항에 있어서, 피클링 탱크는 60℃ 이상의 온도에서 50g/ℓ 이상의 무기산을 함유하고 있는 것을 특징으로 하는 공정.The process according to claim 5, wherein the pickling tank contains at least 50 g / l of inorganic acid at a temperature of 60 deg. 제1항에 있어서, 피클링 탱크는 100 내지 200g/ℓ의 무기산을 함유하고 있는 것을 특징으로 하는 공정.The process according to claim 1, wherein the pickling tank contains 100 to 200 g / l of inorganic acid. 제1항에 있어서, 제2피클링 탱크를 포함하고, 상기 제2피클링 탱크가 60℃ 이상의 온도에서 50g/ℓ 이상의 무기산을 함유하고 있는 것을 특징으로 하는 공정.The process according to claim 1, comprising a second pickling tank, wherein the second pickling tank contains at least 50 g / l of inorganic acid at a temperature of 60 ° C or higher. 제9항에 있어서, 제2탱크는 77℃ 이상의 온도에서 100 내지 200g/ℓ이상의 무기산을 함유하고 있는 것을 특징으로 하는 공정.10. The process according to claim 9, wherein the second tank contains an inorganic acid of 100 to 200 g / l or more at a temperature of 77 ° C or higher. 제10항에 있어서, 피클링 탱크내의 산은 스케일의 이동 방향에 반대 방향으로 역류 유동되는 것을 특징으로 하는 공정.The process according to claim 10, wherein the acid in the pickling tank is flowed countercurrently in a direction opposite to the direction of movement of the scale. 제1항에 있어서, 활성화된 스케일을 무기산을 함유하고 있는 다른 탱크로 침지시키는 부가 단계를 포함하는 것을 특징으로 하는 공정.The process according to claim 1, comprising the additional step of dipping the activated scale into another tank containing inorganic acid. 제12항에 있어서, 나머지 다른 탱크도 과산화수소를 포함하는 것을 특징으로 하는 공정.13. The process of claim 12, wherein the other tank also contains hydrogen peroxide. 제1항에 있어서, 스케일을 활성화한 후에 수용액이 유리 과산화수소를 파괴하는 용해된 철 이온을 함유한 폐수와 혼합되는 것을 특징으로 하는 공정.The process according to claim 1, wherein after activating the scale, the aqueous solution is mixed with waste water containing dissolved iron ions that breaks free hydrogen peroxide. 제1항에 있어서, 스케일을 활성화한 후에 수용액이 유리 과산화수소를 파괴하는 용해된 철 이온을 함유한 무기산과 혼합되는 것을 특징으로 하는 공정.The process according to claim 1, wherein after activating the scale, the aqueous solution is mixed with an inorganic acid containing dissolved iron ions that breaks free hydrogen peroxide. 제1항에 있어서, 피클링된 스트립은 무기산에 의해 제거되지 않은 잔류 스케일을 분해하도록 브러쉬되는 것을 특징으로 하는 공정.The process of claim 1, wherein the pickled strip is brushed to break down residual scale that has not been removed by the inorganic acid. 제1항에 있어서, 상기 스트립은 열간 가공 또는 어닐링 가공된 제2철 스테인레스강인 것을 특징으로 하는 공정.The process as claimed in claim 1, wherein the strip is hot or annealed ferric stainless steel. 제1항에 있어서, 전처리는 쇼트 블라스팅인 것을 특징으로 하는 공정.The process of claim 1 wherein the pretreatment is shot blasting. 크롬을 함유한 제1철 합금으로부터 스케일을 제거하는 공정에 있어서, 스케일로 덮여진 크롬을 함유한 제1철 합금 스트립을 제공하는 단계와, 스케일을 분해하도록 스트립을 전처리하는 단계와, 분해된 스케일을 제거하도록 염산 및 황산으로 구성된 그룹으로부터 하나의 무기산을 내장한 하나 이상의 피클링 탱크에 전처리된 스트립을 침지시키는 단계와, 스트립 상의 잔류 스케일이 과산화물에 의해 활성화되고 동시에 수용액 내에 함유된 무기산에 의해 제거됨으로써 순수한 스트링을 형성하게 되는, 20g/ℓ 이상의 과산화수소와 5g/ℓ 이상의 무기산을 함유한 수용액을 피클링된 스트립에 가하는 단계를 포함하는 것을 특징으로 하는 공정.A process for removing a scale from a ferrous alloy containing chromium, the method comprising: providing a ferrous alloy strip containing chromium covered with scale, pretreating the strip to disintegrate the scale, and decomposing scale Immersing the pretreated strip in one or more pickling tanks containing one inorganic acid from the group consisting of hydrochloric acid and sulfuric acid to remove the residue, and the residual scale on the strip is activated by the peroxide and simultaneously removed by the inorganic acid contained in the aqueous solution. And adding an aqueous solution containing at least 20 g / l hydrogen peroxide and at least 5 g / l inorganic acid to the pickled strip, thereby forming a pure string. 크롬을 함유한 제1철 합금으로부터 스케일을 제거하는 공정에 있어서, 스케일로 덮여진 스테인레스강 스트립을 제공하는 단계와, 스케일을 분해하도록 스트립을 전처리하는 단계와, 분해된 스케일을 제거하도록 77℃ 이상의 온도에서 50g/ℓ 이상의 무기산을 내장한 하나 이상의 피클링 탱크에 전처리된 스트립을 침지시키는 단계와, 스트립 상의 잔류 스케일을 활성화시키기 위해 20g/ℓ 이상의 과산화수소와 20g/ℓ 이상의 무기산을 함유한 수용액을 가하는 단계와, 활성화된 잔류 스케일을 제거하기 위해 77 이상의 온도에서 50g/ℓ 이상의 무기산을 내장한 또 다른 피클링 탱크에 활성화된 스트립을 침지시키는 단계와, 스트립 상의 잔류 스케일이 과산화수소에 의해 활성화되고 동시에 수용액 내에 함유된 무기산에 의해 제거됨으로써 순수한 스트립을 형성하게 되도록, 20g/ℓ 이상의 과산화수소와 20g/ℓ 이상의 무기산을 함유한 수용액을 피클링된 스트립에 가하는 단계를 포함하는 것을 특징으로 하는 공정.A process for removing scales from a ferrous alloy containing chromium, the method comprising the steps of: providing a scale covered stainless steel strip, pretreating the strip to decompose the scale, and at least 77 ° C to remove the decomposed scale. Immersing the pretreated strip in at least one pickling tank containing at least 50 g / l inorganic acid at temperature, and adding an aqueous solution containing at least 20 g / l hydrogen peroxide and at least 20 g / l inorganic acid to activate the residual scale on the strip. Immersing the activated strip in another pickling tank containing at least 50 g / l of inorganic acid at a temperature of 77 or more to remove the activated residual scale, the residual scale on the strip being activated by hydrogen peroxide and simultaneously By removing the inorganic strips contained within Adding to the pickled strip an aqueous solution containing at least 20 g / l hydrogen peroxide and at least 20 g / l inorganic acid so as to form. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019970020297A 1996-05-24 1997-05-23 Hydrogen Peroxide Pickling in Stainless Steel KR100492841B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US08/667,498 1996-05-24
US08/667,498 US5702534A (en) 1996-05-24 1996-05-24 Hydrogen peroxide pickling of stainless steel
US08/821,154 US5743968A (en) 1997-03-20 1997-03-20 Hydrogen peroxide pickling of stainless steel
US08/821,154 1997-03-20

Publications (2)

Publication Number Publication Date
KR970074980A true KR970074980A (en) 1997-12-10
KR100492841B1 KR100492841B1 (en) 2005-08-31

Family

ID=27099693

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019970020297A KR100492841B1 (en) 1996-05-24 1997-05-23 Hydrogen Peroxide Pickling in Stainless Steel

Country Status (14)

Country Link
EP (1) EP0808919B1 (en)
JP (1) JP4032319B2 (en)
KR (1) KR100492841B1 (en)
CN (1) CN1177082C (en)
AR (1) AR007285A1 (en)
AT (1) ATE204033T1 (en)
AU (1) AU706523B2 (en)
BR (1) BR9703228A (en)
CA (1) CA2205122C (en)
DE (1) DE69705993T2 (en)
DK (1) DK0808919T3 (en)
ES (1) ES2162155T3 (en)
MX (1) MX9703809A (en)
TW (1) TW416996B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100948923B1 (en) * 2003-05-29 2010-03-23 주식회사 포스코 Device for removing scale on strip in pickling line

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1244718C (en) * 2001-04-09 2006-03-08 Ak资产公司 Hydrogen peroxide pickling of silicon-containing electrical steel grades
WO2002081380A1 (en) * 2001-04-09 2002-10-17 Ak Properties, Inc. Apparatus and method for removing hydrogen peroxide from spent pickle liquor
KR100470410B1 (en) * 2002-05-29 2005-02-07 주식회사 포스코 Pickling method for reducing hot spot of cold rolled strip surface
CN101922011B (en) * 2010-08-06 2012-08-29 东北大学 Pickling method of surface of 430 stainless steel
KR101316393B1 (en) * 2011-08-10 2013-10-08 주식회사 포스코 Eco-friendly scale removing system of martensitic stainless steel sheet and method for manufacturing martensitic stainless steel sheet using the same
EP3029163B9 (en) 2014-12-02 2019-11-27 CMI UVK GmbH Method and system of treating a carbon steel strip, especially for pickling
CN106148973A (en) * 2015-04-21 2016-11-23 宝钢特钢有限公司 A kind of acid washing method of hot rolling ordinary stainless steel plate
CN105887104A (en) * 2016-06-02 2016-08-24 中冶南方工程技术有限公司 Nitric acid-free pickling method for hot-rolled 439 ferrite stainless steel
CN105908195B (en) * 2016-06-02 2018-03-27 中冶南方工程技术有限公司 A kind of hot rolling 409L ferritic stainless steels are without nitric acid acidwashing method
CN105887103A (en) * 2016-06-02 2016-08-24 中冶南方工程技术有限公司 Nitric acid-free acid pickling method for hot-rolled 430 ferritic stainless steel
CN105908196A (en) * 2016-06-02 2016-08-31 中冶南方工程技术有限公司 Nitric acid-free acid washing method of hot-rolled 304 austenitic stainless steel
CN106011886A (en) * 2016-06-02 2016-10-12 中冶南方工程技术有限公司 Nitric acid-free pickling method for hot-rolled 201 austenitic stainless steel
CN106435607B (en) * 2016-06-30 2021-05-18 宝钢德盛不锈钢有限公司 Environment-friendly continuous annealing and pickling production method for stainless steel hot-rolled coil and pickling solution
CN106835159B (en) * 2016-12-27 2021-05-18 宝钢德盛不锈钢有限公司 Continuous pickling method and pickling solution for medium-high chromium stainless steel cold-rolled coil
TWI657167B (en) * 2018-02-21 2019-04-21 中國鋼鐵股份有限公司 Pickled steel belt cleaning device
CN112672641B (en) * 2018-09-24 2022-12-09 莱利专利股份有限公司 Milking system with detection system
CN110316511A (en) * 2019-06-05 2019-10-11 浙江长兴鼎昌金属制品有限公司 A kind of energy-saving equipment producing cooling conveying for stainless steel
CN114011790A (en) * 2021-11-25 2022-02-08 桂林电子科技大学 Automatic pickling processing equipment for mechanical parts
CN114959717A (en) * 2022-06-15 2022-08-30 中冶华天工程技术有限公司 Method for removing iron scale of ferritic stainless steel

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2895856A (en) * 1955-12-15 1959-07-21 United States Steel Corp Method of pickling chromium-containing steel tubes
JPS5096431A (en) * 1973-12-28 1975-07-31
SE439025B (en) * 1979-09-13 1985-05-28 Fagersta Ab SET TO REMOVE OXID LAYERS FROM THE SURFACE OF HOT ROLLED STAINLESS STEEL
JPS5681688A (en) * 1979-12-06 1981-07-03 Kawasaki Steel Corp Pickling method for hot rolled austenitic stainless steel plate
JPS5861283A (en) * 1981-10-05 1983-04-12 Sumitomo Metal Ind Ltd Descaling method for steel wire rod by pickling
JPS60152689A (en) * 1984-01-19 1985-08-10 Nippon Steel Corp Pickling method for preventing die galling of hot rolled steel sheet
JPS60243289A (en) * 1984-05-17 1985-12-03 Kobe Steel Ltd Pickling method
US5154774A (en) * 1985-09-19 1992-10-13 Ugine Aciers De Chatillon Et Gueugnon Process for acid pickling of stainless steel products
IT1255655B (en) * 1992-08-06 1995-11-09 STAINLESS STEEL PICKLING AND PASSIVATION PROCESS WITHOUT THE USE OF NITRIC ACID
JPH06320494A (en) * 1993-05-18 1994-11-22 Tokai Kikai Seisakusho:Kk Trimming processing device for wood hardboard and the like
DE4420718A1 (en) * 1994-06-15 1995-12-21 Gewerk Keramchemie Pickling strip or sheet material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100948923B1 (en) * 2003-05-29 2010-03-23 주식회사 포스코 Device for removing scale on strip in pickling line

Also Published As

Publication number Publication date
AR007285A1 (en) 1999-10-27
TW416996B (en) 2001-01-01
ATE204033T1 (en) 2001-08-15
AU2360197A (en) 1997-11-27
KR100492841B1 (en) 2005-08-31
JP4032319B2 (en) 2008-01-16
AU706523B2 (en) 1999-06-17
CA2205122A1 (en) 1997-11-24
ES2162155T3 (en) 2001-12-16
CN1178262A (en) 1998-04-08
BR9703228A (en) 1998-09-01
CA2205122C (en) 2008-07-15
DK0808919T3 (en) 2001-10-08
DE69705993D1 (en) 2001-09-13
EP0808919B1 (en) 2001-08-08
MX9703809A (en) 1998-04-30
EP0808919A1 (en) 1997-11-26
DE69705993T2 (en) 2002-04-04
CN1177082C (en) 2004-11-24
JPH1046373A (en) 1998-02-17

Similar Documents

Publication Publication Date Title
KR970074980A (en) Hydrogen Peroxide Pickling in Stainless Steel
US3248269A (en) Scale removal
JPS6045274B2 (en) Compositions and methods for chemical stripping of metal deposits
JPH0321640B2 (en)
US4586961A (en) Methods and compositions for removing copper and copper oxides from surfaces
US5724668A (en) Method for decontamination of nuclear plant components
GB1493582A (en) Method and composition for cleaning metals
US4026777A (en) Metallic descaling system
JPS5425226A (en) Method of treating waste gas from pickling process
US4012299A (en) Metallic descaling system
DE69711090T2 (en) METHOD FOR TREATING IRON-CONTAINING METAL ALLOYS AND TITANIUM AND ITS ALLOYS
JPS56119113A (en) Removing method for dust stuck on contact lens
US3161598A (en) Method and composition for chemical rust removal
US3529998A (en) Pickling process
ATE411119T1 (en) ENVIRONMENTALLY FRIENDLY PROCESS FOR THE CHEMICAL AND MECHANICAL SURFACE TREATMENT OF METAL CONTAINERS
JPH0219486A (en) Film removing treatment of metal and alloy
US5022971A (en) Process for the electrolytic pickling of high-grade steel strip
US5545795A (en) Method for decontaminating radioactive metal surfaces
Narváez et al. Effect of ferric ions in AISI 316L stainless steel pickling using an environmentally‐friendly H2SO4‐HF‐H2O2 mixture
CN100464011C (en) Method for oxidizing cultural relics in ironware
ES2170352T3 (en) DECONTAMINATION OF METALLURGICAL WASTE CONTAINING ZINC, CONTINUOUSLY AND IN BASIC ENVIRONMENT.
CS271345B2 (en) Method of scale and metal oxides and their alloys removal of trivalent iron pickling bath
GB1392896A (en) Electrolytic method of manufacturing highly corrosion-resistant tinplate
DE19820001C2 (en) Process for removing metal layers on metal, glass, ceramics and plastic parts
JPS56133478A (en) Descaling method for stainless steel

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20130508

Year of fee payment: 9

FPAY Annual fee payment

Payment date: 20140513

Year of fee payment: 10

FPAY Annual fee payment

Payment date: 20150511

Year of fee payment: 11

LAPS Lapse due to unpaid annual fee