EP2938748A2 - Procédé de passivation - Google Patents

Procédé de passivation

Info

Publication number
EP2938748A2
EP2938748A2 EP13861504.2A EP13861504A EP2938748A2 EP 2938748 A2 EP2938748 A2 EP 2938748A2 EP 13861504 A EP13861504 A EP 13861504A EP 2938748 A2 EP2938748 A2 EP 2938748A2
Authority
EP
European Patent Office
Prior art keywords
injector component
process according
passivation process
passivation
injector
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.)
Withdrawn
Application number
EP13861504.2A
Other languages
German (de)
English (en)
Inventor
Ebru OEZEL
Azra MARTIN
Zuehre VAROL OEZGUER
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2938748A2 publication Critical patent/EP2938748A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • C21D1/72—Temporary coatings or embedding materials applied before or during heat treatment during chemical change of surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9053—Metals
    • F02M2200/9061—Special treatments for modifying the properties of metals used for fuel injection apparatus, e.g. modifying mechanical or electromagnetic properties

Definitions

  • the present invention relates to a passivation method for protecting steel-based materials against the nitriding process.
  • the hardness and toughness values of the material surface should be increased.
  • One of the methods for increasing hardness and toughness of the surface is the nitriding method.
  • some regions on the piece for instance the regions whereon tooth is formed
  • a paste is applied to said regions comprising various chemical substances. Said process is realized by the operator manually in an inhomogeneous manner.
  • the regions, remaining under the paste are passivated during the nitriding process, in other words, the region is prevented from being subject to the nitriding process.
  • the paste After the nitriding process is completed, the paste, provided on the passivated region, is cleaned. If this cleaning process is not realized in a correct manner, there occur problems like deposition on the surface. Moreover, if the paste application process is realized manually in an inhomogeneous manner, some regions are subjected to nitriding process. In the application US4746376A, a slurry is disclosed which functions as a protective against the nitriding process.
  • the present invention relates to a passivation process for providing passivation against the nitriding process, in order to eliminate the abovementioned problems and to bring new advantages to the related technical field.
  • the main object of the present invention is to provide a passivation process for providing passivation of the injector component, which will be subject to nitriding process, against nitriding.
  • the present invention is a passivation process against the nitriding process in the parts where the hardness, toughness and fatigue strength are not desired to be changed after the nitriding process of any injector component. Accordingly, the method is characterized by comprising the steps of: a. Subjecting the injector component to a grinding process,
  • the grinding process is realized by means of at least one magnetic paper.
  • the surface is cleaned in a mechanical manner.
  • step (a) in said step (a), different magnetic papers are utilized having different porosity values.
  • step (a) magnetic papers are utilized having Allegro (between 7 and 10) pm, Doc (between 2 and 4) pm, Chem (between 0,03 and 0,05) pm porosity values.
  • Allegro between 7 and 10 pm
  • Doc between 2 and 4 pm
  • Chem between 0,03 and 0,05 pm porosity values.
  • the injector component in said step (b), is cleaned in an ultrasonic manner inside the acetone in the range of 8-12 minutes.
  • the injector component in said step (b), is kept in H 2 S0 4 solution in the range of 8-12 percent in volume for duration between 25 and 35 seconds. In another preferred embodiment of the subject matter invention, in said step (b), the injector component is kept in H 2 S0 4 solution in the range of 4-6 percent in volume for duration between 25 and 35 seconds.
  • the injector component is rinsed with pure water after every stage of step (b).
  • step (c) the injector component is kept in a solution comprising NaOH, Na 2 S0 4 and Na 2 C0 3 by applying current in the range of 8-12 mA/cm 2 for duration of 18-22 minutes.
  • step (c) the injector component is rinsed with pure water after it is kept in the solution comprising NaOH, Na 2 S0 4 and Na 2 C0 3 .
  • step (d) the injector component is subject to watts type nickel coating process.
  • the injector component in step (d), is coated by nickel with a thickness 3,4-3,6 pm with a current density between 0,33-0,39 mA/cm 2 in a solution with a pH value between 3,3-3,6.
  • the nickel coating is provided at a thickness of 3,5 pm.
  • an injector component produced after passing said passivation process, is an injector comprising said injector component.
  • the nitriding process is realized for increasing the hardness and toughness values of the injector.
  • nitrogen is diffused into an injector component (10) and the hardness, toughness and fatigue values of the injector are improved.
  • the nitriding process is not desired to be applied at every region of the injector component (10). Therefore, the regions, which are desired to be subjected to the nitriding process, are kept active and the other regions are passivated. For providing said passivation, the passivation process whose details are described below is realized.
  • step (a) of the passivation process the injector component (10) is subject to a grinding process.
  • step (a) where the grinding process is realized, a magnetic paper (Allegro- 9 m) is utilized whose porosity value is at a high level.
  • step (a) where the grinding process is realized, a magnetic paper (Doc- 3 pm) is utilized whose porosity value is lower than the porosity value utilized in the first step.
  • step (a) where the grinding process is realized, the injector component is cleaned by means of the grinding process by utilizing a magnetic paper (Chem-0,04 ⁇ ) with a porosity value lower than the porosity value in second step.
  • step (b) of the passivation process the injector component (10) is subject to chemical washing process.
  • step (b) where the chemical washing process is realized, the injector component (10) is cleaned in an ultrasonic manner inside acetone for duration of 10 minutes.
  • the injector component (10) is rinsed with pure water.
  • the injector component (10) is kept for 30 seconds inside the H 2 S0 4 solution having a portion of 10 percent in volume.
  • the injector component (10) is rinsed with pure water.
  • the injector component (10) is kept for thirty seconds inside the H 2 S0 4 solution having a portion of 5 percent in volume.
  • the injector component (10) is rinsed with pure water.
  • step (c) of the passivation process the injector component (10) is subject to the electrochemical washing process.
  • a current of 10 mA/cm 2 is applied to the injector component (10) for duration of 20 minutes, and afterwards, it is kept in a solution including NaOH, Na 2 S0 4 and Na 2 C0 3 .
  • the injector component (10) is rinsed with pure water.
  • step (d) of the passivation process the injector component (10) is subject to the nickel coating process.
  • the method called Watts type nickel coating process, is utilized in the present art.
  • Nickel having a thickness of 3,5 pm and having a current density of 0,36 mA/cm 2 , is coated inside a solution (30) having pH of 3,5 and having nickel sulphamate therein [Ni(S0 3 NH 2 )].
  • the injector component (10) is immersed into a solution (30) provided in a vessel (20).
  • a vessel (20) is connected to a power supply (50) together with the anode (40) provided therein, and thereby the circuit is completed and the nickel, provided inside the solution (30), is provided to be coated onto the injector component (10) provided in the cathode position.
  • the passivation of the injector component (10) against the nitriding process is realized.
  • a coating with a thickness of 3,5 pm is realized for providing full passivation together with the smallest coating thickness.
  • thicker or thinner coating thicknesses can be provided.
  • the injector component (10) is made of 50CrMo4 material.
  • any kind of steel-based material can be utilized.
  • the protection scope of the present invention is set forth in the annexed Claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Chemically Coating (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

L'invention porte sur un procédé de passivation s'opposant au processus de nitruration dans les parties où on ne souhaite pas changer la dureté, la ténacité et la résistance à la fatigue après le processus de nitruration d'un quelconque composant (10) d'injecteur. Par conséquent ledit procédé est caractérisé en ce qu'il comprend les étapes consistant à : a. soumettre le composant d'injecteur (10) à un processus de meulage, b. soumettre le composant d'injecteur (10) au processus de lavage chimique, c. soumettre le composant d'injecteur (10) au processus de lavage électrochimique et d. soumettre le composant d'injecteur (10) au processus de revêtement de nickel.
EP13861504.2A 2012-12-31 2013-12-20 Procédé de passivation Withdrawn EP2938748A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201215689 2012-12-31
PCT/IB2013/002950 WO2014108727A2 (fr) 2012-12-31 2013-12-20 Procédé de passivation

Publications (1)

Publication Number Publication Date
EP2938748A2 true EP2938748A2 (fr) 2015-11-04

Family

ID=50896330

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13861504.2A Withdrawn EP2938748A2 (fr) 2012-12-31 2013-12-20 Procédé de passivation

Country Status (3)

Country Link
EP (1) EP2938748A2 (fr)
CN (1) CN104981550A (fr)
WO (1) WO2014108727A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114150257A (zh) * 2021-12-17 2022-03-08 江西洪都航空工业集团有限责任公司 一种真空热处理防渗碳方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3689380A (en) * 1970-03-18 1972-09-05 Udylite Corp Process for acid copper plating of steel
LU77013A1 (fr) * 1977-03-24 1978-11-03
JPS57203766A (en) * 1981-06-08 1982-12-14 Usui Internatl Ind Co Ltd Slender and thick steel pipe having hardened layer on its circumferential wall surface, and its manufacture
US4746376A (en) 1986-10-22 1988-05-24 Kolene Corporation Method of preventing diffusion of N2, O2 or C in selected metal surfaces
CN1042843C (zh) * 1994-06-18 1999-04-07 东北大学 电镀金刚石磨具的制备方法
EP0728055A1 (fr) * 1994-09-08 1996-08-28 Struers A/S Feuille de couverture de meulage/polissage se pla ant sur un disque tournant de meulage/polissage
CN101260552B (zh) * 2008-04-23 2010-06-09 哈尔滨工程大学 一种根管器械的表面再制造方法
CN201471305U (zh) * 2009-04-06 2010-05-19 初敏 一种磁性砂纸打磨架

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014108727A2 *

Also Published As

Publication number Publication date
WO2014108727A3 (fr) 2015-02-19
WO2014108727A2 (fr) 2014-07-17
CN104981550A (zh) 2015-10-14

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