EP2864520B1 - Process for the anti-oxidising surface treatment of steel parts - Google Patents

Process for the anti-oxidising surface treatment of steel parts Download PDF

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Publication number
EP2864520B1
EP2864520B1 EP12766159.3A EP12766159A EP2864520B1 EP 2864520 B1 EP2864520 B1 EP 2864520B1 EP 12766159 A EP12766159 A EP 12766159A EP 2864520 B1 EP2864520 B1 EP 2864520B1
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EP
European Patent Office
Prior art keywords
steel parts
oxidising
components
nitriding
washing
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EP12766159.3A
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German (de)
English (en)
French (fr)
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EP2864520A1 (en
Inventor
Fabrizio CAVINA FULVIO
Guido ROVETTO
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    • 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
    • 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
    • C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
    • C23C8/18—Oxidising of ferrous surfaces
    • 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
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces
    • 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
    • C23C8/34—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 more than one element being applied in more than one step
    • 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
    • C23C8/80—After-treatment

Definitions

  • the present invention refers to a process for the anti-oxidising surface treatment of steel parts.
  • a galvanic treatment can be performed, such as chromium-plating, nickel-plating or partially zinc-plating, etc.
  • Another type of treatment, this time of the thermal type, is nitriding, followed by an oxidising step performed in salt baths at the presence of cyanide, cyanate and sodium carbonate, which therefore is rather obnoxious from the ecological and working safety points of view.
  • the corrosion resistance feature is important, and is obtained, using the current technology, by painting such envelopes with a suitable corrosion-preventing paint: also this treatment has severe ecological problems, due to the toxic materials being used.
  • Object of the present invention is solving the above prior art problems, by providing a new process for the anti-oxidising treatment of steel parts that is ecological, does not show the above pollution and working safety problems and provides the same levels of wear and corrosion resistance of current technologies; such process further allows extending the length of such resistance, in components such as filters, because it will not be necessary any more to paint them, since such property will be embedded into the structure itself of the material being treated.
  • Another object of the present invention is providing a process as mentioned above that has a better resistance to saline mist, and allows a better oxidising, with respect to known processes.
  • a further benefit of such process is that it is much safer than the previous ones, using a step of pre-heating with nitrogen instead of air, as happened in prior processes.
  • the process of the invention is used for the anti-oxidising surface treatment of steel parts, and comprises the steps of:
  • the steel parts can be components for motor vehicle use, or for oil platforms, or still more to be used in mechanics.
  • inventive process is also applied to several other types of components that need nitriding and oxidising.
  • the mixture with which the sub -step of maintaining at the same temperature of 520 - 600 °C is performed contains, in volume, 70% of NH 3 , from 10% to 15% of N 2 and, respectively, from 20% to 15% of CO 2 .
  • the mixture with which the sub-step of maintaining at the same temperature of 520 - 600 °C is performed can contain, in volume, 70% of NH 3 , 10% of N 2 and 20% of CO 2 .
  • a plant for performing the above-described anti-oxidising surface treatment of steel parts substantially comprises:
  • the oxidising means 9 are connected to the pit furnace 7 in order to perform in a single plant the step of steam oxidising after the step of washing with nitrogen the furnace 7.
  • the charge 3 is extracted from the furnace 7, through the handling means 2, and is sent to following workings.
  • FIG 2 describes a typical pit furnace 7 used for the plant of Figure 1 .
  • the furnace 7 comprises an external structure 11 for support and heat insulation, composed of ceramic fiber and containing, inside, on its side walls and its lower wall, a plurality of electric resistances 13 for heating the internal environment.
  • the charge 3 is inserted centrally and coaxially into the furnace 7 using its upper opening; the charge 3 is slinged in a supporting structure 15 ending with a cover 17 that facilitates its various handling operations.
  • the furnace 7 is closed by a plug 19, modelled in order to support a motored fan 21, whose blades 23 work in order to move the gas mixture contained inside the furnace, in order to keep its temperature uniform.
  • the furnace 7 is further equipped, in its upper part, with an exhausting device 25, which is a barrel from which reaction gases from various processes go out: such gases are burnt by the flame generated by such exhausting device 25.
  • Function of the exhausting device 25 is also signalling the moment in which the oxidising step (that has different operating times according to the number and sizes of treated parts) ends, because at such time the small flame contained therein is extinguished.
  • the oxidising means 9 can be composed of an intermittence-type pump suitable to send distilled water onto the charge 3 for its oxidation, or be composed of a steam generator adapted to steam-oxidise the charge 3, or still more be oxidising means adapted to perform the oxidising of the charge 3 by using the same CO 2 already present in the nitriding plant.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
EP12766159.3A 2012-06-26 2012-06-26 Process for the anti-oxidising surface treatment of steel parts Active EP2864520B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2012/000198 WO2014002120A1 (en) 2012-06-26 2012-06-26 Process and plant for the anti-oxidising surface treatment of steel parts

Publications (2)

Publication Number Publication Date
EP2864520A1 EP2864520A1 (en) 2015-04-29
EP2864520B1 true EP2864520B1 (en) 2018-09-26

Family

ID=46934633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12766159.3A Active EP2864520B1 (en) 2012-06-26 2012-06-26 Process for the anti-oxidising surface treatment of steel parts

Country Status (5)

Country Link
EP (1) EP2864520B1 (enrdf_load_stackoverflow)
CN (1) CN104603319B (enrdf_load_stackoverflow)
BR (1) BR112014032480A2 (enrdf_load_stackoverflow)
IN (1) IN2015MN00144A (enrdf_load_stackoverflow)
WO (1) WO2014002120A1 (enrdf_load_stackoverflow)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104928619A (zh) * 2014-08-28 2015-09-23 浙江长兴天盛工业炉有限公司 一种井式氮化炉
CN105063549B (zh) * 2015-07-17 2017-08-04 东莞市海瀚防静电器材有限公司 渗氮防腐蚀复合金属精益管制备方法及制备装置
CN106482523B (zh) * 2016-05-30 2019-03-08 丁文江 用过热蒸汽作为传热载体的热处理系统及热处理方法
CN109576634A (zh) * 2018-12-28 2019-04-05 宁波合力模具科技股份有限公司 一种高真空挤压压铸模的表面氧化方法
CN110724902A (zh) * 2019-11-18 2020-01-24 惠州市鑫洪柏精密五金制品有限公司 一种无污染的钢铁气体发黑工艺
CN110952061A (zh) * 2019-12-16 2020-04-03 上海始金新材料科技有限公司 一种卧式氧氮化炉
EP4008802A1 (en) * 2020-12-02 2022-06-08 Linde GmbH Method of and apparatus for oxidative post-processing of a nitrided or nitrocarburized article
CN113604772A (zh) * 2021-08-18 2021-11-05 盛瑞传动股份有限公司 一种工件蒸汽处理工艺
CN114293139A (zh) * 2021-12-07 2022-04-08 江苏聚源电气有限公司 一种低温软氮化工艺

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0229325B1 (en) * 1981-10-15 1995-01-04 LUCAS INDUSTRIES public limited company Method of manufacturing a corrosion resistant steel component
GB8310102D0 (en) * 1983-04-14 1983-05-18 Lucas Ind Plc Corrosion resistant steel components
JPH01298146A (ja) * 1988-05-26 1989-12-01 Toray Eng Co Ltd 金属表面処理方法
IT1261077B (it) * 1993-07-06 1996-05-08 Procedimento ed impianto per il trattamento superficiale antiossidantedi particolari in acciaio, specialmente di particolari o componenti difiltri
EP1122331B1 (de) * 2000-02-04 2003-03-26 Ipsen International GmbH Verfahren zum Nitrieren und/oder Nitrocarburieren von höher legierten Stählen
CN101050517A (zh) * 2007-05-15 2007-10-10 上海工业大学嘉定通用机械有限公司 钢铁材料表面改性处理工艺方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
IN2015MN00144A (enrdf_load_stackoverflow) 2015-10-16
WO2014002120A1 (en) 2014-01-03
BR112014032480A2 (pt) 2017-06-27
EP2864520A1 (en) 2015-04-29
CN104603319B (zh) 2017-10-10
CN104603319A (zh) 2015-05-06

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