ES389762A1 - Process for increasing the corrosion resistance of austenitic stainless steels - Google Patents

Process for increasing the corrosion resistance of austenitic stainless steels

Info

Publication number
ES389762A1
ES389762A1 ES389762A ES389762A ES389762A1 ES 389762 A1 ES389762 A1 ES 389762A1 ES 389762 A ES389762 A ES 389762A ES 389762 A ES389762 A ES 389762A ES 389762 A1 ES389762 A1 ES 389762A1
Authority
ES
Spain
Prior art keywords
corrosion resistance
austenitic stainless
stainless steels
increasing
solutions
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.)
Expired
Application number
ES389762A
Other languages
Spanish (es)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stamicarbon BV
Original Assignee
Stamicarbon BV
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
Application filed by Stamicarbon BV filed Critical Stamicarbon BV
Publication of ES389762A1 publication Critical patent/ES389762A1/en
Expired legal-status Critical Current

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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/68—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/02—Apparatus characterised by being constructed of material selected for its chemically-resistant properties
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
    • C07C273/04—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds from carbon dioxide and ammonia
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/02—Pretreatment of the material to be coated
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • C23C8/12—Oxidising using elemental oxygen or ozone
    • C23C8/14—Oxidising of ferrous surfaces

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A process is described for enhancing the corrosion resistance of austenitic stainless steels which are exposed to solutions containing ammonium carbamate. The process involves exposing the surfaces of such stainless steel equipment, which are exposed to ammonium carbamate solutions during, e.g., the commercial manufacture of urea and melamine, to the corrosive effects of such solutions for a period of time to induce significant corrosion of such surfaces, followed by contacting said surfaces at a temperature of at least about 100 DEG C for a period of time with an oxidizing agent.
ES389762A 1970-04-02 1971-03-31 Process for increasing the corrosion resistance of austenitic stainless steels Expired ES389762A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7004678.A NL164328C (en) 1970-04-02 1970-04-02 PROCESS FOR INCREASING RESISTANCE TO CORROSION OF AUSTENITIC CHROME-NICKEL SAMPLES, AND METHOD FOR PREPARING UREA IN APPARATUS THEREFORE INCREASED IN RESISTANCE TO CORROSION.

Publications (1)

Publication Number Publication Date
ES389762A1 true ES389762A1 (en) 1973-06-01

Family

ID=19809733

Family Applications (1)

Application Number Title Priority Date Filing Date
ES389762A Expired ES389762A1 (en) 1970-04-02 1971-03-31 Process for increasing the corrosion resistance of austenitic stainless steels

Country Status (9)

Country Link
US (1) US3720548A (en)
JP (1) JPS515630B1 (en)
BE (1) BE765197A (en)
CA (1) CA949436A (en)
DE (1) DE2116201A1 (en)
ES (1) ES389762A1 (en)
FR (1) FR2085804B1 (en)
GB (1) GB1287710A (en)
NL (1) NL164328C (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2503763C3 (en) * 1975-01-30 1978-03-16 Uranit Uran-Isotopentrennungs- Gesellschaft Mbh, 5170 Juelich Process for the formation of a corrosion-preventing, oxidic protective layer on corrosion-sensitive steels
EP0096151B1 (en) * 1982-06-03 1986-07-23 Montedison S.p.A. Method for avoiding the corrosion of strippers in urea manufacturing plants
CH691479A5 (en) * 1996-12-06 2001-07-31 Siemens Ag Surface treatment of steel.
JP4112056B2 (en) * 1997-12-18 2008-07-02 東洋エンジニアリング株式会社 Improved urea synthesis method and apparatus
JP2005501178A (en) * 2001-08-31 2005-01-13 ディーエスエム アイピー アセッツ ビー．ブイ． How to make metals corrosion resistant
GB0124846D0 (en) * 2001-10-16 2001-12-05 Unilever Plc Corrosion protection process
ITMI20120013A1 (en) 2012-01-09 2013-07-10 Saipem Spa PROCEDURE FOR THE SYNTHESIS OF UREA INCLUDING A STRIPPER FUND OF PASSIVATION
WO2014192823A1 (en) 2013-05-28 2014-12-04 東洋エンジニアリング株式会社 Urea synthesis method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2576680A (en) * 1945-09-15 1951-11-27 Electro Chimie Metal Method for increasing the resistance to corrosion of stainless steel
US2680766A (en) * 1951-03-23 1954-06-08 Du Pont Method of inhibiting corrosion in urea synthesis reactors
BE527914A (en) * 1953-04-15
US2890974A (en) * 1957-12-02 1959-06-16 Fairchild Engine & Airplane Passivation of stainless steel alloys

Also Published As

Publication number Publication date
NL7004678A (en) 1971-10-05
US3720548A (en) 1973-03-13
FR2085804B1 (en) 1974-03-08
NL164328C (en) 1980-12-15
GB1287710A (en) 1972-09-06
CA949436A (en) 1974-06-18
JPS515630B1 (en) 1976-02-21
DE2116201A1 (en) 1971-11-04
NL164328B (en) 1980-07-15
FR2085804A1 (en) 1971-12-31
BE765197A (en) 1971-10-04

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