EP3875634B1 - Protection against galvanic corrosion for assembling metal parts - Google Patents

Protection against galvanic corrosion for assembling metal parts Download PDF

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Publication number
EP3875634B1
EP3875634B1 EP21159971.7A EP21159971A EP3875634B1 EP 3875634 B1 EP3875634 B1 EP 3875634B1 EP 21159971 A EP21159971 A EP 21159971A EP 3875634 B1 EP3875634 B1 EP 3875634B1
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EP
European Patent Office
Prior art keywords
metal
stainless steel
assembly
aluminum
washer
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EP21159971.7A
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German (de)
French (fr)
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EP3875634A1 (en
Inventor
Tony Jean-Philippe ROUCHE
Virginie JAMET
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Alstom Transport Technologies SAS
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Alstom Transport Technologies SAS
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Priority to PL21159971T priority Critical patent/PL3875634T3/en
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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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/12—Electrodes characterised by the material
    • C23F13/14—Material for sacrificial anodes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C22C18/04—Alloys based on zinc with aluminium as the next major constituent
    • 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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/10—Electrodes characterised by the structure

Definitions

  • Such an assembly is in particular intended to be used in numerous mechanical assemblies, in particular in the railway sector.
  • the standard corrosion potential of the material of the metallic part 60 and the standard corrosion potential of the stainless steel of the metallic element 20 are determined with respect to the same reference electrode. This is, for example, the saturated calomel reference electrode, at 1 bar of pressure and at 25°C.
  • the figure 2 describes an assembly 100 according to a second embodiment of the invention.
  • the screw 240, the washer 250 and the threaded part 260 are made of galvanized steel, preferably a steel with a lamellar or electrolytic type zinc coating.
  • the threaded part 260 is made of zinc-plated steel with a zinc-nickel electrolytic zinc plating.

Description

La présente invention concerne un assemblage d'un élément métallique comprenant de l'acier inoxydable et d'une pièce métallique comprenant un matériau différent de l'acier inoxydable.The present invention relates to an assembly of a metal element comprising stainless steel and a metal part comprising a material other than stainless steel.

Un tel assemblage est notamment destiné à être utilisé dans de nombreux ensembles mécaniques, notamment dans le secteur ferroviaire.Such an assembly is in particular intended to be used in numerous mechanical assemblies, in particular in the railway sector.

Cependant, cet assemblage ne donne pas entière satisfaction, car il est sujet au phénomène de corrosion galvanique entre l'acier inoxydable de l'élément métallique et le matériau différent de l'acier inoxydable de la pièce métallique, ce qui conduit à l'usure prématurée de cet assemblage. WO 2014/002003 A1 divulgue par exemple un assemblage d'un élément métallique comprenant de l'acier inoxydable et d'une pièce métallique comprenant un matériau différent de l'acier inoxydable, à savoir de l'aluminium, dans lequel l'élément métallique comprenant de l'acier inoxydable et ladite pièce métallique en aluminium sont isolés l'un de l'autre par une pièce intercalaire réalisée dans un matériau ayant une valeur de potentiel électrique comprise entre celles de l'acier inoxydable et celle de l'aluminium, par exemple une pièce en cuivre ou en bronzeHowever, this assembly does not give complete satisfaction, because it is subject to the phenomenon of galvanic corrosion between the stainless steel of the metallic element and the material different from the stainless steel of the metallic part, which leads to wear. premature of this assembly. WO 2014/002003 A1 discloses for example an assembly of a metal element comprising stainless steel and a metal part comprising a material other than stainless steel, namely aluminum, in which the metal element comprising steel stainless steel and said aluminum metal part are insulated from each other by an intermediate part made of a material having an electric potential value between those of stainless steel and that of aluminum, for example a part made of copper or bronze

Un but de l'invention est donc de proposer un assemblage résistant au phénomène de corrosion galvanique.An object of the invention is therefore to propose an assembly resistant to the phenomenon of galvanic corrosion.

A cet effet, l'invention a pour objet un assemblage du type précité, dans lequel l'élément métallique comprenant de l'acier inoxydable et la pièce métallique sont isolés l'un de l'autre par une pièce intercalaire comprenant un substrat en acier recouvert d'un revêtement métallique en alliage de zinc, l'alliage comprenant de l'aluminium et du magnésium.To this end, the subject of the invention is an assembly of the aforementioned type, in which the metal element comprising stainless steel and the metal part are isolated from each other by an intermediate part comprising a steel substrate coated with a zinc alloy metal coating, the alloy comprising aluminum and magnesium.

L'assemblage selon l'invention peut comprendre l'une ou plusieurs des caractéristiques suivantes, prises isolément ou suivant toutes combinaisons techniquement possibles :

  • le revêtement métallique comprend une quantité de magnésium variant de 0,5% à 5% en poids par rapport au poids total de l'alliage.
  • le revêtement métallique comprend une quantité d'aluminium variant de 0,5% à 10% en poids par rapport au poids total de l'alliage.
  • le revêtement métallique comprend, en poids par rapport au poids total de l'alliage, de 0,5% à 5% de magnésium et de 0,5% à 10% d'aluminium, le reste étant du zinc et des impuretés inévitables.
  • la pièce métallique comprend un matériau dont un potentiel standard de corrosion est strictement inférieur à un potentiel standard de l'acier inoxydable de l'élément métallique, le potentiel standard du matériau de la pièce et le potentiel standard du matériau de l'élément métallique étant mesurés par rapport à une même électrode de référence, le potentiel standard du matériau de la pièce métallique étant de préférence inférieur d'au moins 300 mV au potentiel standard de l'acier inoxydable de l'élément métallique.
  • la pièce métallique comprend un matériau choisi parmi la liste consistant en un acier zingué, un acier peint, un aluminium ou un aluminium peint.
  • l'élément métallique comprenant de l'acier inoxydable est un élément d'assemblage comprenant une vis et une rondelle, la pièce métallique est un rail en C en aluminium et la pièce intercalaire est un pied de fixation d'un coffre d'un véhicule ferroviaire.
  • le rail en C comprend une goulotte, le rail en C comprenant deux bords longitudinaux supérieurs définissant une ouverture d'accès à la goulotte, le pied de fixation comprend une surface inférieure et une surface supérieure, et dans lequel la surface inférieure du pied de fixation est en contact avec les bords longitudinaux du rail en C en aluminium, la rondelle est en contact avec la surface supérieure du pied de fixation, le rail en C, le pied de fixation et la rondelle sont maintenus ensemble par la vis, en contact avec une partie supérieure de la rondelle et vissée dans une pièce taraudée disposée dans la goulotte.
  • l'élément métallique comprenant de l'acier inoxydable est un rail en C, la pièce métallique est un pied de fixation d'un coffre d'un véhicule ferroviaire et la pièce intercalaire est une entretoise disposée entre le rail en C et le pied de fixation.
  • le rail en C comprend une goulotte, le rail en C comprenant deux bords longitudinaux supérieurs définissant une ouverture d'accès à la goulotte, le pied de fixation comprend une surface inférieure et une surface supérieure, et dans lequel le rail en C, l'entretoise et le pied de fixation sont maintenus ensemble par un ensemble formé d'une rondelle en contact avec une surface supérieure du pied de fixation, d'une vis en contact avec une partie supérieure de la rondelle et d'une pièce taraudée disposée dans la goulotte, dans laquelle est vissée la vis, le pied de fixation et l'entretoise étant pris en étau entre la rondelle et la pièce taraudée.
The assembly according to the invention may comprise one or more of the following characteristics, taken individually or in any technically possible combination:
  • the metallic coating comprises a quantity of magnesium varying from 0.5% to 5% by weight relative to the total weight of the alloy.
  • the metallic coating comprises an amount of aluminum varying from 0.5% to 10% by weight relative to the total weight of the alloy.
  • the metallic coating comprises, by weight relative to the total weight of the alloy, from 0.5% to 5% magnesium and from 0.5% to 10% aluminum, the remainder being zinc and unavoidable impurities.
  • the metallic part comprises a material whose standard corrosion potential is strictly lower than a standard potential of the stainless steel of the metallic element, the standard potential of the material of the part and the standard potential of the material of the metallic element being measured against a same reference electrode, the standard potential of the material of the metal part being preferably at least 300 mV below the standard stainless steel potential of the metallic element.
  • the metal part comprises a material chosen from the list consisting of a zinc-plated steel, a painted steel, an aluminum or a painted aluminum.
  • the metal part comprising stainless steel is an assembly part comprising a screw and a washer, the metal part is an aluminum C-rail and the spacer part is a mounting foot of a trunk of a vehicle railway.
  • the c-track includes a chute, the c-track including two upper longitudinal edges defining an access opening to the chute, the mounting foot includes a bottom surface and a top surface, and wherein the bottom surface of the mounting foot is in contact with the longitudinal edges of the aluminum C-rail, the washer is in contact with the upper surface of the mounting foot, the C-rail, the mounting foot and the washer are held together by the screw, in contact with an upper part of the washer and screwed into a threaded part arranged in the chute.
  • the metal element comprising stainless steel is a C-rail, the metal part is a foot for fixing a trunk of a railway vehicle and the intermediate part is a spacer arranged between the C-rail and the foot of fixation.
  • the C-track includes a chute, the C-track including two upper longitudinal edges defining an access opening to the chute, the mounting foot includes a bottom surface and a top surface, and wherein the C-track, the spacer and the fixing foot are held together by an assembly formed by a washer in contact with an upper surface of the fixing foot, a screw in contact with an upper part of the washer and a threaded part placed in the chute, in which the screw is screwed, the fixing foot and the spacer being clamped between the washer and the threaded part.

L'invention a également pour objet un procédé de protection contre la corrosion galvanique d'un assemblage d'un élément métallique comprenant de l'acier inoxydable et d'une pièce métallique caractérisé en ce qu'il comprend l'ajout d'une pièce intercalaire comprenant un substrat en acier recouvert d'un revêtement métallique en alliage de zinc, l'alliage comprenant de l'aluminium et du magnésium, la pièce intercalaire étant disposée entre la pièce métallique comprenant de l'acier inoxydable et la pièce métallique, pour former un assemblage tel que décrit ci-dessus.The invention also relates to a method for protecting against galvanic corrosion of an assembly of a metal element comprising stainless steel and a metal part, characterized in that it comprises the addition of a part spacer comprising a steel substrate covered with a metal coating of zinc alloy, the alloy comprising aluminum and magnesium, the spacer being disposed between the metal part comprising stainless steel and the metal part, for form an assembly as described above.

L'invention a également pour objet un véhicule ferroviaire comprenant un assemblage tel que décrit ci-dessus.The invention also relates to a railway vehicle comprising an assembly as described above.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple, et faite en se référant aux dessins annexés sur lesquels :

  • [Fig 1] la figure 1 est une vue schématique d'une section partielle d'un assemblage selon un premier mode de réalisation de l'invention,
  • [Fig 2] la figure 2 est une vue schématique d'une section partielle d'un assemblage selon un deuxième mode de réalisation de l'invention, et
  • [Fig 3] la figure 3 est une vue schématique d'une section partielle d'un assemblage selon un troisième mode de réalisation de l'invention.
The invention will be better understood on reading the following description, given solely by way of example, and made with reference to the appended drawings in which:
  • [ Fig 1 ] the figure 1 is a schematic view of a partial section of an assembly according to a first embodiment of the invention,
  • [ Fig 2 ] the figure 2 is a schematic view of a partial section of an assembly according to a second embodiment of the invention, and
  • [ Fig.3 ] the picture 3 is a schematic view of a partial section of an assembly according to a third embodiment of the invention.

La figure 1 représente un assemblage 10 selon un premier mode de réalisation de l'invention, vu en section selon un plan parallèle à une direction générale d'assemblage.The figure 1 shows an assembly 10 according to a first embodiment of the invention, seen in section along a plane parallel to a general assembly direction.

L'assemblage 10 est un assemblage d'un élément métallique 20 et d'une pièce métallique 60.Assembly 10 is an assembly of a metal element 20 and a metal part 60.

L'élément métallique 20 comprend de l'acier inoxydable.The metallic element 20 comprises stainless steel.

La pièce métallique 60 comprend un matériau différent de l'acier inoxydable.The metal part 60 comprises a material other than stainless steel.

L'élément métallique 20 et la pièce métallique 60 sont isolés l'un de l'autre par une pièce intercalaire 30.The metal element 20 and the metal part 60 are isolated from each other by an intermediate part 30.

La pièce intercalaire 30 comprend un substrat 40 en acier recouvert d'un revêtement métallique 50 en alliage de zinc, ledit alliage comprenant de l'aluminium et du magnésium. Le revêtement métallique 50 est déposé selon un procédé de galvanisation à chaud.The spacer 30 comprises a substrate 40 made of steel covered with a metallic coating 50 made of zinc alloy, said alloy comprising aluminum and magnesium. The metallic coating 50 is deposited using a hot-dip galvanizing process.

Dans l'exemple illustré, l'assemblage 10 comporte ainsi un empilement successif, selon la direction générale d'assemblage, de l'élément métallique 20, de la pièce intercalaire 30, et de la pièce métallique 60. La pièce intercalaire 30 est ainsi disposée entre l'élément métallique 20 et la pièce métallique 60.In the example illustrated, the assembly 10 thus comprises a successive stack, in the general assembly direction, of the metal element 20, of the spacer 30, and of the metal part 60. The spacer 30 is thus disposed between the metal element 20 and the metal part 60.

L'élément métallique 20 et la pièce métallique 60 ne sont pas en contact l'un avec l'autre.The metal element 20 and the metal part 60 are not in contact with each other.

L'élément métallique 20 est par exemple réalisé en acier inoxydable.The metallic element 20 is for example made of stainless steel.

L'acier inoxydable est de préférence de type austénitique.The stainless steel is preferably of the austenitic type.

De préférence, le revêtement métallique 50 comprend une quantité de magnésium variant de 0,5% à 5% en poids, de préférence de 2,5% à 3,5% en poids, et avantageusement sensiblement égale à 3% en poids par rapport au poids total de l'alliage.Preferably, the metallic coating 50 comprises a quantity of magnesium varying from 0.5% to 5% by weight, preferably from 2.5% to 3.5% by weight, and advantageously substantially equal to 3% by weight with respect to to the total weight of the alloy.

De préférence, le revêtement métallique 50 comprend une quantité d'aluminium variant de 0,5% à 10% en poids par rapport au poids total de l'alliage, de préférence de 2,5% à 6% en poids, et est avantageusement sensiblement égale à 3,5% en poids par rapport au poids total de l'alliage.Preferably, the metallic coating 50 comprises an amount of aluminum varying from 0.5% to 10% by weight relative to the total weight of the alloy, preferably from 2.5% to 6% by weight, and is advantageously substantially equal to 3.5% by weight relative to the total weight of the alloy.

Ainsi, dans un mode de réalisation préféré, le revêtement métallique 50 comprend, en poids par rapport au poids total de l'alliage, de 0,5% à 5% de magnésium et de 0,5% à 10% d'aluminium, le reste étant du zinc et des impuretés inévitables.Thus, in a preferred embodiment, the metallic coating 50 comprises, by weight relative to the total weight of the alloy, from 0.5% to 5% magnesium and from 0.5% to 10% aluminum, the remainder being zinc and unavoidable impurities.

Un exemple de revêtement métallique 50 est disponible sous la dénomination commerciale Magnelis®, vendue par la société ArcelorMittal.An example of metallic coating 50 is available under the trade name Magnelis® , sold by ArcelorMittal.

Le revêtement métallique 50 présente par exemple une épaisseur comprise entre 1 µm et 100 µm, de préférence entre 5 µm et 35 µm, avantageusement une épaisseur de 25 µm.The metallic coating 50 has for example a thickness comprised between 1 μm and 100 μm, preferably between 5 μm and 35 μm, advantageously a thickness of 25 μm.

La pièce métallique 60 comprend un matériau différent de l'acier inoxydable, en particulier différent de l'acier inoxydable de l'élément métallique 20.The metal part 60 comprises a material different from stainless steel, in particular different from the stainless steel of the metal element 20.

De préférence, la pièce métallique 60 comprend un matériau dont le potentiel standard de corrosion est strictement inférieur à celui de l'acier inoxydable de l'élément métallique 20. Préférentiellement, la pièce métallique 60 comprend un matériau dont le potentiel standard de corrosion est inférieur d'au moins 300 mV à celui de l'acier inoxydable de l'élément métallique 20.Preferably, the metal part 60 comprises a material whose standard corrosion potential is strictly lower than that of the stainless steel of the metal element 20. Preferably, the metal part 60 comprises a material whose standard corrosion potential is lower of at least 300 mV to that of the stainless steel of the metallic element 20.

Le potentiel standard de corrosion du matériau de la pièce métallique 60 et le potentiel standard de corrosion de l'acier inoxydable de l'élément métallique 20 sont déterminés par rapport à une même électrode de référence. Il s'agit par exemple de l'électrode de référence au calomel saturé, à 1 bar de pression et à 25 °C.The standard corrosion potential of the material of the metallic part 60 and the standard corrosion potential of the stainless steel of the metallic element 20 are determined with respect to the same reference electrode. This is, for example, the saturated calomel reference electrode, at 1 bar of pressure and at 25°C.

Avantageusement, la pièce métallique 60 comprend un matériau choisi parmi la liste consistant en un acier zingué, un acier peint, un aluminium ou un aluminium peint.Advantageously, the metal part 60 comprises a material chosen from the list consisting of zinc-plated steel, painted steel, aluminum or painted aluminum.

De préférence, l'acier zingué de la pièce métallique 60 est un acier revêtu de zinc de type lamellaire, électrolytique ou de galvanisation à chaud.Preferably, the zinc-coated steel of the metal part 60 is a zinc-coated steel of the lamellar, electrolytic or hot-dip galvanizing type.

De préférence, l'aluminium de la pièce métallique 60 est un aluminium peint ou un aluminium avec un traitement de surface de type anodisation ou conversion chimique (« passivation »).Preferably, the aluminum of the metal part 60 is painted aluminum or aluminum with a surface treatment of the anodization or chemical conversion (“passivation”) type.

De préférence, l'acier peint de la pièce métallique 60 comporte une couche d'acier recouverte par au moins une couche protectrice anticorrosive. La couche protectrice anticorrosive de l'acier peint de la pièce métallique 60 est un système de peinture composé d'une peinture primaire et d'une peinture de finition. L'épaisseur moyenne de la couche de peinture primaire est de 40 à 80 µm. L'épaisseur moyenne de la couche de peinture de finition est de 90 à 130 µm.Preferably, the painted steel of the metal part 60 comprises a layer of steel covered by at least one anticorrosive protective layer. The anti-corrosive protective layer of the painted steel of the metal part 60 is a paint system composed of a primer paint and a finish paint. The average thickness of the primary paint layer is 40 to 80 µm. The average thickness of the finishing paint layer is 90 to 130 µm.

La figure 2 décrit un assemblage 100 selon un deuxième mode de réalisation de l'invention.The figure 2 describes an assembly 100 according to a second embodiment of the invention.

Dans ce deuxième mode de réalisation, l'élément métallique comprenant de l'acier inoxydable est un élément d'assemblage comprenant une vis 110 et une rondelle 120.In this second embodiment, the metallic element comprising stainless steel is an assembly element comprising a screw 110 and a washer 120.

La pièce métallique comprenant un matériau différent de l'acier inoxydable est un rail en C 140.The metal part comprising a material other than stainless steel is a C 140 rail.

La pièce intercalaire est un pied de fixation 130 d'un coffre d'un véhicule ferroviaire.The spacer is a mounting foot 130 of a trunk of a railway vehicle.

Ainsi, dans ce deuxième mode de réalisation, l'assemblage 100 comporte l'élément d'assemblage comprenant la vis 110 et la rondelle 120, le pied de fixation 130 d'un coffre d'un véhicule ferroviaire, le rail en C 140 et la pièce taraudée 150.Thus, in this second embodiment, the assembly 100 comprises the assembly element comprising the screw 110 and the washer 120, the fixing foot 130 of a trunk of a railway vehicle, the C-shaped rail 140 and the threaded part 150.

Le rail en C 140 est en aluminium, de préférence en aluminium peint ou en aluminium brut sans traitement de surface.The C-rail 140 is made of aluminium, preferably painted aluminum or raw aluminum without surface treatment.

Le rail en C 140 comporte une goulotte 160 et deux bords longitudinaux supérieurs 165 et 170 définissant une ouverture d'accès à la goulotte 160.The C-shaped rail 140 comprises a chute 160 and two upper longitudinal edges 165 and 170 defining an access opening to the chute 160.

Le pied de fixation 130 est un substrat en acier recouvert d'un revêtement métallique en alliage, le substrat en acier et le revêtement métallique étant tels que définis dans la description ci-dessus.The mounting foot 130 is a steel substrate covered with an alloy metal coating, the steel substrate and the metal coating being as defined in the description above.

Le pied de fixation 130 comprend une surface inférieure 175 et une surface supérieure 180. La surface inférieure 175 du pied de fixation est en contact avec la partie supérieure des bords longitudinaux supérieurs 165 et 170 du rail en C 140.The mounting foot 130 includes a bottom surface 175 and an upper surface 180. The bottom surface 175 of the mounting foot contacts the top of the upper longitudinal edges 165 and 170 of the C-rail 140.

Le pied de fixation 130 est solidarisé au rail en C 140 au moyen de la vis 110 et de la pièce taraudée 150. La vis 110 passe dans une ouverture traversante du pied de fixation 130, dans l'ouverture d'accès à la goulotte 160 et est vissée dans la pièce taraudée 150 disposée dans la goulotte 160.The fixing foot 130 is secured to the C-shaped rail 140 by means of the screw 110 and the threaded part 150. The screw 110 passes through a through opening of the fixing foot 130, in the access opening to the trunking 160 and is screwed into the threaded part 150 arranged in the chute 160.

La rondelle 120 est disposée entre la vis 110 et le pied de fixation 130. La rondelle 120 est en contact avec la surface supérieure 180 du pied de fixation 130 et la vis 110 est en contact avec une partie supérieure de la rondelle 120.The washer 120 is placed between the screw 110 and the fixing foot 130. The washer 120 is in contact with the upper surface 180 of the fixing foot 130 and the screw 110 is in contact with an upper part of the washer 120.

La vis 110 et la rondelle 120 sont en acier inoxydable, de préférence de type austénitique.The screw 110 and the washer 120 are made of stainless steel, preferably of the austenitic type.

Dans l'assemblage 100, la rondelle 120 n'est pas en contact avec le rail en C 140.In assembly 100, washer 120 is not in contact with C-rail 140.

La figure 3 décrit un assemblage 200 selon un troisième mode de réalisation de l'invention.The picture 3 describes an assembly 200 according to a third embodiment of the invention.

Dans ce troisième mode de réalisation, l'élément métallique comprenant de l'acier inoxydable est un rail en C 210, la pièce métallique est un pied de fixation 220 d'un coffre d'un véhicule ferroviaire et la pièce intercalaire est une entretoise 230 disposée entre le rail en C 210 et le pied de fixation 220.In this third embodiment, the metal element comprising stainless steel is a C-shaped rail 210, the metal part is a mounting foot 220 of a trunk of a railway vehicle and the spacer is a spacer 230 disposed between the C-rail 210 and the fixing foot 220.

L'assemblage 200 comporte ainsi le rail en C 210, le pied de fixation 220 d'un coffre d'un véhicule ferroviaire, et l'entretoise 230 disposée entre le rail en C 210 et le pied de fixation 220.The assembly 200 thus comprises the C-rail 210, the fixing foot 220 of a trunk of a railway vehicle, and the spacer 230 arranged between the C-rail 210 and the fixing foot 220.

L'assemblage comporte en outre un ensemble formé d'une vis 240, d'une rondelle 250 et d'une pièce taraudée 260.The assembly further comprises an assembly formed by a screw 240, a washer 250 and a threaded piece 260.

Le rail en C 210 est en acier inoxydable, de préférence de type austénitique.The C-rail 210 is made of stainless steel, preferably of the austenitic type.

Le rail en C 210 comporte une goulotte 270 et deux bords longitudinaux supérieurs 275 et 280 définissant une ouverture d'accès à la goulotte 270.The C-rail 210 includes a chute 270 and two upper longitudinal edges 275 and 280 defining an access opening to the chute 270.

Le pied de fixation 220 est en aluminium, de préférence en aluminium peint ou en aluminium avec un traitement de surface de type anodisation ou conversion chimique.The fixing foot 220 is made of aluminum, preferably painted aluminum or aluminum with a surface treatment of the anodizing or chemical conversion type.

Le pied de fixation 220 comprend une surface inférieure 285 et une surface supérieure 290.Attachment foot 220 includes a bottom surface 285 and a top surface 290.

L'entretoise 230 est un substrat en acier recouvert d'un revêtement métallique en alliage, le substrat en acier et le revêtement métallique étant tels que défini dans la description ci-dessus.The spacer 230 is a steel substrate covered with an alloy metal coating, the steel substrate and the metal coating being as defined in the description above.

L'entretoise 230 est en contact avec la partie supérieure des bords longitudinaux supérieurs 275 et 280 du rail en C 210 et avec la surface inférieure 285 du pied de fixation 220.The spacer 230 is in contact with the upper part of the upper longitudinal edges 275 and 280 of the C-rail 210 and with the lower surface 285 of the fixing foot 220.

La surface supérieure 290 du pied de fixation 220 est en contact avec la rondelle 250.The upper surface 290 of the fixing foot 220 is in contact with the washer 250.

Le rail en C 210, l'entretoise 230 et le pied de fixation 220 sont maintenus ensemble par l'ensemble formé de la vis 240, de la rondelle 250 et de la pièce taraudée 260.The C-shaped rail 210, the spacer 230 and the fixing foot 220 are held together by the assembly formed by the screw 240, the washer 250 and the threaded part 260.

La vis 240, la rondelle 250 et la pièce taraudée 260 sont en acier zingué, de préférence un acier avec un zingage de type lamellaire ou électrolytique. De préférence, la pièce taraudée 260 est en acier zingué avec un zingage électrolytique zinc-nickel.The screw 240, the washer 250 and the threaded part 260 are made of galvanized steel, preferably a steel with a lamellar or electrolytic type zinc coating. Preferably, the threaded part 260 is made of zinc-plated steel with a zinc-nickel electrolytic zinc plating.

La rondelle 250 est disposée entre la vis 240 et le pied de fixation 220. La vis 240 passe à travers la rondelle 250, à travers une ouverture traversante du pied de fixation 220, à travers une ouverture traversante de l'entretoise 230, dans l'ouverture d'accès à la goulotte 270 et est vissée dans la pièce taraudée 260 disposée dans la goulotte 270 du rail en C 210.The washer 250 is disposed between the screw 240 and the fixing foot 220. The screw 240 passes through the washer 250, through a through opening of the fixing foot 220, through a through opening of the spacer 230, in the 'opening access to the chute 270 and is screwed into the threaded piece 260 arranged in the chute 270 of the C-shaped rail 210.

Le pied de fixation 220 et l'entretoise 230 sont pris en étau entre la rondelle 250 et la pièce taraudée 260.The fixing foot 220 and the spacer 230 are clamped between the washer 250 and the threaded part 260.

Dans l'assemblage 200, le pied de fixation 220 n'est pas en contact avec le rail en C 210.In assembly 200, mounting foot 220 is not in contact with C-rail 210.

La pièce intercalaire 30, 130, 230 permet d'isoler l'élément métallique 20, 120, 210 comprenant de l'acier inoxydable de la pièce métallique 60, 140, 220 comprenant un matériau différent de l'acier inoxydable. Grâce à la présence du revêtement 50, la pièce intercalaire 30, 130, 230 ne subit que très peu le phénomène de corrosion galvanique. La pièce intercalaire 30, 130, 230 constitue donc une barrière physique pérenne qui empêche la corrosion galvanique entre l'élément métallique 20, 120, 210 comprenant de l'acier inoxydable de la pièce métallique 60, 140, 220 comprenant un matériau différent de l'acier inoxydable.The spacer 30, 130, 230 makes it possible to isolate the metal element 20, 120, 210 comprising stainless steel from the metal part 60, 140, 220 comprising a material other than stainless steel. Thanks to the presence of the coating 50, the spacer 30, 130, 230 undergoes only very little the phenomenon of galvanic corrosion. The spacer 30, 130, 230 therefore constitutes a permanent physical barrier which prevents galvanic corrosion between the metal element 20, 120, 210 comprising stainless steel and the metal part 60, 140, 220 comprising a material different from stainless steel. 'stainless steel.

L'assemblage selon l'invention est une solution plus pérenne que l'ajout d'une anode sacrificielle ou d'un revêtement, qui doivent être remplacés régulièrement. L'assemblage selon l'invention peut également être mis en œuvre dans des cas où son procédé de fabrication nécessite une maitrise de la force de serrage appliquée pour maintenir l'ensemble (« serrage au couple »).The assembly according to the invention is a more durable solution than adding a sacrificial anode or a coating, which must be replaced regularly. The assembly according to the invention can also be implemented in cases where its manufacturing process requires control of the clamping force applied to hold the assembly (“torque tightening”).

Claims (12)

  1. An assembly (10, 100, 200) of a metal element (20, 120, 210) comprising stainless steel and a metal part (60, 140, 220) comprising a material different from stainless steel, characterized in that the metal part (20, 120, 210) comprising stainless steel and the metal part (60, 140, 220) are isolated from one another by an intermediate part (30, 130, 230) comprising a steel substrate (40) covered with a metal coating (50) made from zinc alloy, the alloy comprising aluminum and magnesium.
  2. The assembly according to claim 1, wherein the metal coating (50) comprises a quantity of magnesium varying from 0.5% to 5% by weight relative to the total weight of the alloy.
  3. The assembly according to claim 1 or 2, wherein the metal coating (50) comprises a quantity of aluminum varying from 0.5% to 10% by weight relative to the total weight of the alloy.
  4. The assembly according to claim 1, wherein the metal coating (50) comprises, by weight relative to the total weight of the alloy, from 0.5% to 5% magnesium and from 0.5% to 10% aluminum, the rest being zinc and unavoidable impurities.
  5. The assembly according to any one of the preceding claims, wherein the metal part (60, 140, 220) comprises a material whereof a standard corrosion potential is strictly less than a standard potential of the stainless steel of the metal element (20, 120, 210), the standard potential of the material of the metal part (60, 140, 220) and the standard potential of the material of the metal element (20, 120, 210) being measured relative to a same reference electrode, the standard potential of the material of the metal part (60, 140, 220) preferably being at least 300 mV less than the standard potential of the stainless steel of the metal element (20, 120, 210).
  6. The assembly according to any one of the preceding claims, wherein the metal part (60) comprises a material chosen from the list consisting of a galvanized steel, a painted steel, an aluminum or a painted aluminum.
  7. The assembly according to any one of the preceding claims, wherein the metal element (20) comprising stainless steel is an assembly element comprising a screw (110) and a washer (120), the metal part (60) is a C-shaped rail (140) made from aluminum and the intermediate part (30) is a fastening foot (130) of a box of a rail vehicle.
  8. The assembly according to claim 7, wherein the C-shaped rail (140) comprises a trough, the C-shaped rail (140) comprising two upper longitudinal edges defining an access opening to the trough, the fastening foot (130) comprises a lower surface and an upper surface, and wherein:
    - the lower surface of the fastening foot (130) is in contact with the longitudinal edges of the aluminum C-shaped rail (140),
    - the washer (120) is in contact with the upper surface of the fastening foot (130),
    - the C-shaped rail (140), the fastening foot (130) and the washer (120) are held together by the screw (110), in contact with an upper part of the washer (120) and screwed into a tapped part (150) arranged in the trough.
  9. The assembly according to any one of claims 1 to 6, wherein the metal element (20) comprising stainless steel is a C-shaped rail (210), the metal part (60) is a fastening foot (220) of a box of a rail vehicle and the intermediate part (30) is a spacer (230) arranged between the C-shaped rail (210) and the fastening foot (220).
  10. The assembly according to claim 9, wherein the C-shaped rail (210) comprises a trough, the C-shaped rail (210) comprising two upper longitudinal edges defining an access opening to the trough, the fastening foot (220) comprises a lower surface and an upper surface, and wherein the C-shaped rail (210), the spacer (230) and the fastening foot (220) are held together by an assembly formed by a washer (250) in contact with an upper surface of the fastening foot (220), a screw (240) in contact with an upper part of the washer (250) and a tapped part (260) arranged in the trough in which the screw (240) is screwed, the fastening foot and the spacer being clamped between the washer and the tapped part.
  11. A method for protecting against galvanic corrosion for an assembly of a metal element (20, 120, 210) comprising stainless steel and metal part (60, 140, 220), characterized in that it comprises adding an intermediate part (30, 130, 230) comprising a steel substrate (40) covered with a metal coating (50) made from zinc alloy, the alloy comprising aluminum and magnesium, the intermediate part (30, 130, 230) being arranged between the metal part (60, 140, 220) comprising stainless steel and the metal part (60, 140, 220), to form an assembly as defined according to any one of claims 1 to 10.
  12. A rail vehicle comprising an assembly as defined according to one of claims 1 to 10.
EP21159971.7A 2020-03-02 2021-03-01 Protection against galvanic corrosion for assembling metal parts Active EP3875634B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL21159971T PL3875634T3 (en) 2020-03-02 2021-03-01 Protection against galvanic corrosion for assembling metal parts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2002085A FR3107711B1 (en) 2020-03-02 2020-03-02 Protection against galvanic corrosion of assembly of metal parts

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EP3875634A1 EP3875634A1 (en) 2021-09-08
EP3875634B1 true EP3875634B1 (en) 2022-03-02

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EP (1) EP3875634B1 (en)
ES (1) ES2914427T3 (en)
FR (1) FR3107711B1 (en)
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010242195A (en) * 2009-04-09 2010-10-28 Kobe Steel Ltd Surface treated metallic material excellent in anti-corrosion property against dissimilar metal contact corrosion and dissimilar material joint body including the same
ITBS20120097A1 (en) * 2012-06-28 2013-12-29 Emer Spa VALVE WITH ALUMINUM BODY AND ANTI-CORROSION SYSTEM
HUE027742T2 (en) * 2013-05-13 2016-10-28 Arcelormittal Assembly of an aluminum component and of a steel component having a znalmg alloy coating

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PL3875634T3 (en) 2022-06-20
FR3107711A1 (en) 2021-09-03
FR3107711B1 (en) 2022-03-11
EP3875634A1 (en) 2021-09-08
ES2914427T3 (en) 2022-06-10

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