EP1997939B1 - Cylindre hydraulique et son procédé de fabrication - Google Patents

Cylindre hydraulique et son procédé de fabrication Download PDF

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Publication number
EP1997939B1
EP1997939B1 EP08008397A EP08008397A EP1997939B1 EP 1997939 B1 EP1997939 B1 EP 1997939B1 EP 08008397 A EP08008397 A EP 08008397A EP 08008397 A EP08008397 A EP 08008397A EP 1997939 B1 EP1997939 B1 EP 1997939B1
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EP
European Patent Office
Prior art keywords
chromium
current density
structural part
bath
nip
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.)
Active
Application number
EP08008397A
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German (de)
English (en)
Other versions
EP1997939A1 (fr
Inventor
Vincenzo Trivigno
Hartmut Wagner
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.)
Weber Hydraulik GmbH Germany
Original Assignee
Weber Hydraulik GmbH Germany
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 Weber Hydraulik GmbH Germany filed Critical Weber Hydraulik GmbH Germany
Publication of EP1997939A1 publication Critical patent/EP1997939A1/fr
Application granted granted Critical
Publication of EP1997939B1 publication Critical patent/EP1997939B1/fr
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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
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
    • C25D5/14—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
    • 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
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/605—Surface topography of the layers, e.g. rough, dendritic or nodular layers
    • C25D5/611—Smooth layers
    • 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
    • C25D7/10—Bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1457—Piston rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2215/00—Fluid-actuated devices for displacing a member from one position to another
    • F15B2215/30—Constructional details thereof
    • F15B2215/305—Constructional details thereof characterised by the use of special materials

Definitions

  • the invention relates to a generic iron (Fe) having carrier of relatively moving over a running surface parts of a hydraulic cylinder, in particular piston rod, with an electrochemically applied outer layer of chromium (Cr).
  • the outer layer is in a thickness of about 30 microns as a mechanically wear resistant hard chrome (not decorative decorative chrome layers of about 0.3 to 0.9 microns such as in the JP-7278845 . JP-8100273 disclosed). Because of this, these known mechanical components have proven themselves and are sufficiently resistant to corrosion and abrasion.
  • the chromium layers deposited in this way have inherent tensile stresses which can cause cracks in the chromium layer, which drastically reduces the protection against corrosion.
  • this is the generic Hydraulic cylinders by an electrochemically applied intermediate layer of pure nickel ( DE 36 19 336 A1 ) or by double chromium plating, if appropriate in addition to the intermediate layer of pure nickel ( JP 200 130405 A ) or in non-generic components ( DE-40 09 914-C2 ) by previous nickel plating ( JP10-251870 ) strengthened.
  • the relatively thick outer layer of chromium is electrochemically applied only with a large amount of chromium and accordingly with correspondingly high energy, which is reflected in a comparatively high price, although for these known mechanical components after the salt spray test (SST) only a service life of 96 h is guaranteed.
  • the invention is therefore based on the object to provide a cheaper manufacturable component of a hydraulic cylinder with better corrosion resistance and high abrasion resistance.
  • the part or component of the hydraulic cylinder according to the invention has surprisingly compared to the generic state of the art ten times greater life of over 900 hours after the SST, although it with only about 10 to 12 microns thick outer layer made of hard chrome.
  • the mechanism of action is not known, the high lifetime can be concluded to be an absolutely dense intermediate layer of typically about the same thickness as the outer layer and a most intimate atomic compound of this with the intermediate layer of NiP.
  • the intermediate layer of NiP may also have a leveling effect.
  • the component according to the invention can be produced correspondingly inexpensively, because the costs for the intermediate layer are only slightly lower.
  • the intermediate layer has a thickness of 5 ⁇ m to 30 ⁇ m, preferably 7 ⁇ m to 20 ⁇ m, preferably 9 ⁇ m to 15 ⁇ m and advantageously 10 ⁇ m to 12 ⁇ m
  • the outer layer has a thickness of 5 ⁇ m to 30 ⁇ m, preferably 7 ⁇ m to 20 ⁇ m, preferably 9 ⁇ m to 15 ⁇ m and advantageously 10 ⁇ m to 12 ⁇ m.
  • the invention also relates to a known generic method for producing a (structural) part of iron (Fe) as support having moving parts of a hydraulic cylinder, in particular piston rod, with an outer layer of chromium (Cr), this cathodically in a chromium plating in the electrolyte electrochemically deposited.
  • This generic method according to the preamble of the main claim is characterized according to the invention by its characterizing features, ie the fact that first on the iron (Fe) having carrier electrochemically in a first bath with a Ni and P having electrolyte, an intermediate layer of NiP is deposited and that the component is then brought into the chromium plating bath in which it is preferably cathodically coated during a first time interval with a low first current density and in at least one further penultimate time interval with a comparatively larger penultimate current density with the depositing Cr.
  • the intermediate layer of NiP is first produced electrochemically. Then it will be the mechanics component directly - wet in wet - in the chrome plating bath to avoid expensive to be eliminated again passive layers ( DE-2854403-C2 ).
  • the outer layer of chromium atomically with the intermediate layer of NiP intimately without another, for reducing the potential donating, adhesion-promoting additional layer to connect, although the layer as NiP has a higher potential than chromium.
  • the component is subjected to a separate bath for a short time after the rinsing with water carried out after the degreasing and before it is introduced into the chromating bath while being connected to the anode for the purpose of (re) activation.
  • the first current density 5 A / dm 2 and the penultimate current density 20 A / dm 2 amount are mentioned below.
  • the first time interval lasts 300 s and the penultimate time interval 120 s.
  • the last time interval following the penultimate time interval is measured with a current density of 50 A / dm 2 up to the desired deposited thickness of the outer layer of Cr.
  • two subsequent, additional time intervals are provided, which are dimensioned for 180 or 120 s.
  • the current densities in the two further time intervals are set at 10 and 15 A / dm 2, respectively.
  • the component is degreased after coating with the NiP and before hard chrome plating.
  • the component after being coated with the NiP and before hard chrome plating on ultrasound, may be in an alkaline solution, e.g. degreased a Na hydroxide solution.
  • the component is cathodically degassed as a cathode, for example, at a current density of 12 A / dm 2 , which in a preferably ten percent Na hydroxide solution at a current density of 12 A / dm 2 can take place for 180 s, after which the component can be rinsed with water after the cathodic degreasing.
  • the component is, after rinsing with water and before being introduced into the chromium plating bath, connected to the anode for activation, exposed to a separate bath which may have a weak chromium electrolyte of 140 to 190, preferably 150 to 180 g / l Cr.
  • the component can be exposed in the separate bath to a current density of 20 A / dm 2 , for example for 15 s, which has a temperature of 50 to 60, preferably 55 ° C.
  • the component is exposed after the separate bath to the chrome plating bath, which may have 250 to 350, preferably 280 to 320 g / l Cr and a temperature of 50 to 70, preferably 55 ° C.
  • the chrome plating bath which may have 250 to 350, preferably 280 to 320 g / l Cr and a temperature of 50 to 70, preferably 55 ° C.
  • the first bath has a temperature of 50 to 74, preferably 55 ° C.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
  • Press Drives And Press Lines (AREA)

Claims (30)

  1. Vérin hydraulique avec un support contenant du fer (Fe), supportant des pièces du vérin hydraulique, mobiles les unes par rapport aux autres sur une surface de glissement, en particulier une tige de piston, avec une couche extérieure en chrome (Cr), déposée par voie électrochimique, caractérisé en ce qu'une couche intermédiaire en nickel et phosphore (NiP), déposée par voie électrochimique, est contiguë sur le support dans la zone de la surface de glissement, et en ce que la couche extérieure est agencée directement au-dessus de ladite couche intermédiaire.
  2. Vérin hydraulique selon la revendication 1, caractérisé en ce que la couche intermédiaire a une épaisseur de 5 µm à 30 µm, de préférence de 7 µm à 20 µm, de manière préférée de 9 µm à 15 µm et de manière avantageuse de 10 µm à 12 µm.
  3. Vérin hydraulique selon la revendication 1 ou 2, caractérisé en ce que la couche extérieure a une épaisseur de 5 µm à 30 µm, de préférence de 7 µm à 20 µm, de manière préférée de 9 µm à 15 µm et de manière avantageuse de 10 µm à 12 µm.
  4. Procédé de réalisation d'une pièce formant support, contenant du fer (Fe), supportant des pièces d'un vérin hydraulique, mobiles les unes par rapport aux autres sur une surface de glissement, en particulier une tige de piston, avec une couche extérieure en chrome (Cr), celle-ci étant déposée par voie cathodique selon un processus électrochimique dans un bain de chromage contenant du Cr dans l'électrolyte, caractérisé en ce que, tout d'abord, une couche intermédiaire en NiP est déposée sur le support par voie cathodique selon un processus électrochimique dans un premier bain avec un électrolyte contenant du nickel (Ni) et du phosphore (P), en ce que, ensuite, la pièce est amenée dans le bain de chromage et en ce que la pièce est revêtue avec le Cr se déposant par voie électrochimique, soit avec une densité de courant électrique augmentant en continu, soit pendant un premier intervalle de temps avec une première densité de courant et au moins un autre avant-dernier intervalle de temps avec une avant-dernière densité de courant supérieure à celle-ci.
  5. Procédé selon la revendication 4, caractérisé en ce que la première densité de courant est de l'ordre de 5 A/dm2 .
  6. Procédé selon la revendication 4, caractérisé en ce que l'avant-dernière densité de courant est de l'ordre de 20 A/dm2.
  7. Procédé selon la revendication 4, caractérisé en ce que le premier intervalle de temps dure 300 s.
  8. Procédé selon la revendication 4, caractérisé en ce que l'avant-dernier intervalle de temps dure 120 s.
  9. Procédé selon la revendication 4, caractérisé en ce que le dernier intervalle de temps, consécutif à l'avant-dernier intervalle de temps, est défini avec une densité de courant de 50 A/dm2 jusqu'à l'épaisseur déposée souhaitée de la couche extérieure en Cr.
  10. Procédé selon la revendication 4, caractérisé en ce qu'il est prévu deux intervalles de temps supplémentaires consécutifs entre le premier et l'avant-dernier intervalle de temps.
  11. Procédé selon la revendication 10, caractérisé en ce que les deux intervalles de temps supplémentaires durent 180 et respectivement 120 s.
  12. Procédé selon la revendication 10 ou 11, caractérisé en ce que les densités de courant dans les deux intervalles de temps supplémentaires sont réglées à 10 et respectivement 15 A/dm2.
  13. Procédé selon la revendication 4, caractérisé en ce que la pièce est dégraissée après le revêtement avec le NiP et avant le chromage dur.
  14. Procédé selon la revendication 13, caractérisé en ce que la pièce est dégraissée par ultrasons après le revêtement avec le NiP et avant le chromage dur.
  15. Procédé selon la revendication 14, caractérisé en ce que la pièce est dégraissée par ultrasons dans une solution alcaline après le revêtement avec le NiP et avant le chromage dur.
  16. Procédé selon la revendication 15, caractérisé en ce que la pièce est dégraissée par ultrasons dans une solution d'hydroxyde de Na après le revêtement avec le NiP et avant le chromage dur.
  17. Procédé selon la revendication 13, caractérisé en ce que, après le dégraissage alcalin, la pièce, montée en tant que cathode, est dégraissée par voie cathodique.
  18. Procédé selon la revendication 17, caractérisé en ce que le dégraissage cathodique est effectué dans une solution d'hydroxyde de Na avec une densité de courant de 12 A/dm2.
  19. Procédé selon la revendication 18, caractérisé en ce que le dégraissage cathodique est effectué dans une solution, de préférence, à dix pour cent d'hydroxyde de Na avec une densité de courant de 12 A/dm2 et pendant 180 s.
  20. Procédé selon une des revendications précédentes, caractérisé en ce que la pièce est lavée à l'eau après le dégraissage cathodique.
  21. Procédé selon une des revendications précédentes, caractérisé en ce que la pièce, après le lavage à l'eau et avant l'introduction dans le bain de chromage, est soumise à un bain spécial, moyennant le raccordement à l'anode en vue d'une activation.
  22. Procédé selon la revendication 21, caractérisé en ce que le bain spécial comporte un électrolyte faible au chrome.
  23. Procédé selon la revendication 22, caractérisé en ce que l'électrolyte faible au chrome contient 140 à 190, de préférence 150 à 180 g/l de Cr.
  24. Procédé selon la revendication 22 ou 23, caractérisé en ce que la pièce dans le bain spécial est exposée à une densité de courant de 20 A/dm2.
  25. Procédé selon la revendication 24, caractérisé en ce que la pièce dans le bain spécial est exposée à une densité de courant de 20 A/dm2 pendant 15 s.
  26. Procédé selon la revendication 22, caractérisé en ce que le bain spécial a une température de 50 à 60, de préférence 55°C.
  27. Procédé selon une des revendications précédentes, caractérisé en ce que la pièce est introduite dans le bain de chromage après le bain spécial.
  28. Procédé selon la revendication 4, caractérisé en ce que le bain de chromage comporte 250 à 350, de préférence 280 à 320 g/l de Cr.
  29. Procédé selon la revendication 4, caractérisé en ce que le bain de chromage a une température de 50 à 70, de préférence 55°C.
  30. Procédé selon la revendication 4, caractérisé en ce que le premier bain a une température de 50 à 74, de préférence 55°C.
EP08008397A 2007-05-04 2008-05-03 Cylindre hydraulique et son procédé de fabrication Active EP1997939B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007021390A DE102007021390A1 (de) 2007-05-04 2007-05-04 Mechanik-Bauteil sowie dessen Herstellungsverfahren

Publications (2)

Publication Number Publication Date
EP1997939A1 EP1997939A1 (fr) 2008-12-03
EP1997939B1 true EP1997939B1 (fr) 2009-10-07

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ID=39717763

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EP08008397A Active EP1997939B1 (fr) 2007-05-04 2008-05-03 Cylindre hydraulique et son procédé de fabrication

Country Status (3)

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EP (1) EP1997939B1 (fr)
AT (1) ATE445033T1 (fr)
DE (3) DE102007021390A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008049790A1 (de) * 2008-10-03 2010-04-08 Weber Hydraulik Gmbh Hydraulikzylinder sowie dessen Herstellungsverfahren
DE102012004356B4 (de) 2012-03-07 2013-10-31 Umicore Galvanotechnik Gmbh Haftfeste, korrosionsbeständige technische Verchromung und Verfahren zur Herstellung derselben

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1149512A (en) 1966-09-27 1969-04-23 Welwyn Electric Ltd Improvements in or relating to electrical resistors
JPS54124831A (en) * 1978-03-22 1979-09-28 Mishima Kosan Co Ltd Production of casting mold for continuous casting
DE2854403C2 (de) 1978-12-16 1986-07-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zur Reaktivierung und Weiterbeschichtung von Nickel- oder Nickel- Phosphor-Schichten
US4554219A (en) * 1984-05-30 1985-11-19 Burlington Industries, Inc. Synergistic brightener combination for amorphous nickel phosphorus electroplatings
JPS61249647A (ja) * 1985-04-30 1986-11-06 Mitsubishi Heavy Ind Ltd 連続鋳造用鋳型
BE902634A (nl) 1985-06-11 1985-09-30 Limburgs Galvano Tech Bedrijf Werkwijze voor het tegen slijtage en corrosie beschermen van stalen werkstukken, inz. hydraulische cilinders.
GB2230537B (en) 1989-03-28 1993-12-08 Usui Kokusai Sangyo Kk Heat and corrosion resistant plating
JPH07278845A (ja) 1994-04-14 1995-10-24 Marui Kogyo Kk クロムめっき製品及びその製造方法
JP2781362B2 (ja) 1995-07-12 1998-07-30 マルイ工業株式会社 クロムめっき製品の製造方法
JPH10251870A (ja) * 1998-03-09 1998-09-22 Marui Kogyo Kk クロムめっき製品
JP2000130405A (ja) * 1998-10-29 2000-05-12 Mitsubishi Heavy Ind Ltd 液圧シリンダ
JP3313340B2 (ja) 1999-07-23 2002-08-12 日本写真印刷株式会社 マット感を有する成形同時加飾品とその製造方法、マット感を有する加飾用フィルム

Also Published As

Publication number Publication date
DE102007021390A1 (de) 2008-11-06
ATE445033T1 (de) 2009-10-15
EP1997939A1 (fr) 2008-12-03
DE102008048892A1 (de) 2010-04-01
DE502008000134D1 (de) 2009-11-19

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