EP0402287A1 - Apparatus for anodising aluminium alloy pistons used in internal combustion engines - Google Patents
Apparatus for anodising aluminium alloy pistons used in internal combustion engines Download PDFInfo
- Publication number
- EP0402287A1 EP0402287A1 EP90420272A EP90420272A EP0402287A1 EP 0402287 A1 EP0402287 A1 EP 0402287A1 EP 90420272 A EP90420272 A EP 90420272A EP 90420272 A EP90420272 A EP 90420272A EP 0402287 A1 EP0402287 A1 EP 0402287A1
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- Prior art keywords
- piston
- head
- anodising
- internal combustion
- combustion engines
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/005—Apparatus specially adapted for electrolytic conversion coating
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/008—Current shielding devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
Definitions
- the present invention relates to a device for treating by anodizing aluminum alloy pistons used in internal combustion engines.
- This anodization is obtained in a conventional manner by immersion of the piston in an electrolyte bath and passage of alternating or direct electric current between said bath and said piston, the latter playing the role of anode in the case of the use of a direct current.
- the oxide layer must play its role of thermal barrier with sufficient efficiency, its thickness must be at least equal to 50 ⁇ m, hence the need to carry out anodization until establishment. high anode-cathode voltages. Under these conditions, there is a risk of damaging the layer by the burning phenomenon which is an accelerated and localized dissolution of said layer under the effect of a high concentration of current densities at certain points and which leads to strong local temperature increases. . To eliminate this risk, one must limit oneself to the use of current densities of less than 10 A / dm2 and thereby extend the anodization time beyond half an hour to obtain a suitable thickness of oxide.
- this layer has good resistance to thermal fatigue and that it is sufficiently hard so as not to fall apart during the operation of the piston. To achieve this result, it is known to carry out after anodization certain treatments such as compression of the layer as claimed, for example, in French patent 2,354,450.
- This solution consists in using a device for treating by anodizing aluminum alloy pistons used in internal combustion engines, characterized in that the cylindrical lateral surface of said piston is connected to the positive pole of a direct current source by at least two parts applied symmetrically on said surface, which it is equipped along a director located near the head of a deflector made of electrically insulating material whose periphery is curved downwards, whose surface head side is placed opposite an electrode connected to the negative pole of the current source and pierced with at least one opening allowing the passage of a regulated flow of electrolyte anodizing directed towards the head and whose surface facing said electrode is provided with a flexible seal which rests on the surface of the piston.
- the piston is therefore connected to the positive pole of a direct current source, by at least two parts placed symmetrically with respect to the axis of the piston and applied against its lateral surface so as to have a good distribution of the current. and to obtain a homogeneous anodized layer.
- the lateral surface of the piston is equipped with a deflector, a sort of preferably circular dish, the periphery of which is curved downwards according to a profile adapted to the flow of the electrolyte.
- This deflector is supported along a director of the piston located as close as possible to the head and has the function of shielding any passage of electrolyte towards the top of the piston and thus limiting the effect of anodization almost exclusively in the head.
- the material used to make this deflector can be any material insulating from electricity capable of being suitably shaped.
- an electrode preferably having a circular shape and the periphery of which is slightly curved downwards.
- This electrode is connected to the negative pole of said current source and preferably pierced in its center by at least one opening.
- circuits in contact with the electrolyte are made of a material which is chemically inert towards the latter.
- the passage of a regulated flow of electrolyte towards the head makes it possible to achieve a hydrodynamic regime adapted to the dimensions of the surface to be anodized and ensures a high speed of evacuation of the calories so that one can notably increase the density of anodizing current without causing "burn".
- the almost entire mass of the piston being in the open air serves as a heat sink and also contributes to the possibility of using high current densities.
- Such a device also leads to the production of thick oxide layers which can exceed 70 ⁇ m in less than 5 minutes and these layers naturally exhibit hardness, that is to say without any subsequent treatment. adequate fatigue strength.
- the invention can be illustrated using the following example of application: On the side wall of an aluminum alloy piston of the AS12UN type (that is to say containing by weight approximately 12% of silicon, 1% of copper and 1% of nickel as main elements of addition), a DC power supply connected to the positive pole of a source has been fixed. This supply was secured to a deflector adjusted to the wall of the piston. A titanium electrode matured with holes was placed 5 cm from the head and connected to a pipe through which the electrolyte containing 180 g / l of H2SO4 at 5 ° C. circulated. A current density of 50 A / dm2 for 3 minutes and obtained a layer of oxide with a thickness of 65 ⁇ m showing no burn marks. Different measurements were then made on the piston.
- the layer had a hardness between 200 and 300 HV.
- This piston was then subjected to thermal fatigue tests, the cycle of which is indicated below: - passage from - 20 ° C to 350 ° C in 15 s. - air cooling, 15 s. - water cooling, 15 s. - air drying, 15 s.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Catalysts (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Electroplating Methods And Accessories (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Percussion Or Vibration Massage (AREA)
Abstract
Description
La présente invention est relative à un dispositif de traitement par anodisation de pistons en alliage d'aluminium utilisés dans les moteurs à combustion interne.The present invention relates to a device for treating by anodizing aluminum alloy pistons used in internal combustion engines.
On sait que, dans les moteurs à combustion interne, les parties des pistons situées à proximité de la zone de combustion et plus particulièrement les têtes sont en contact avec des gaz relativement chauds et donc soumises à de fortes contraintes thermiques qui peuvent provoquer notamment des déformations ou des évolutions de la structure métallurgique nuisibles au bon fonctionnement desdits moteursIt is known that, in internal combustion engines, the parts of the pistons located near the combustion zone and more particularly the heads are in contact with relatively hot gases and therefore subjected to high thermal stresses which can in particular cause deformations or changes in the metallurgical structure detrimental to the proper functioning of said engines
Pour atténuer l'effet de ces contraintes, notamment dans le cas de pistons réalisés en alliage d'aluminium, l'homme de l'art sait qu'il peut par exemple les traiter par oxydation électrolytique ou anodisation de manière à développer à leur surface une couche d'oxyde dite barrière thermique qui protégera le métal du piston de l'action défavorable de la chaleur.To mitigate the effect of these constraints, in particular in the case of pistons made of aluminum alloy, a person skilled in the art knows that he can, for example, treat them by electrolytic oxidation or anodization so as to develop on their surface. an oxide layer called thermal barrier which will protect the metal of the piston from the unfavorable action of heat.
Cette anodisation est obtenue de manière classique par immersion du piston dans un bain d'électrolyte et passage de courant électrique alternatif ou continu entre ledit bain et ledit piston, ce dernier jouant le rôle d'anode dans le cas de l'utilisation d'un courant continu.This anodization is obtained in a conventional manner by immersion of the piston in an electrolyte bath and passage of alternating or direct electric current between said bath and said piston, the latter playing the role of anode in the case of the use of a direct current.
Etant donné que c'est surtout la région de la tête qui doit être protégée, il paraît inutile et anti-économique de procéder à l'anodisation complète du piston d'autant que cette opération peut nuire à l'état de surface de certaines autres parties dudit piston. C'est pourquoi avant de procéder à l'anodisation on place généralement sur le piston des épargnes ou masques en cire ou en matière polymérique aux endroits où on souhaite maintenir la surface dans son état initial.Given that it is above all the region of the head which must be protected, it seems pointless and uneconomical to carry out a complete anodization of the piston, all the more so since this operation can harm the surface condition of certain others. parts of said piston. This is why before proceeding to anodizing, spares or masks of wax or polymeric material are generally placed on the piston at the places where it is desired to maintain the surface in its initial state.
Cette pratique exige une main d'oeuvre supplémentaire chargée d'abord de poser les masques puis de les enlever soit par dissolution ou tout autre moyen et conduit à une augmentation de la durée totale et du coût du traitement.This practice requires an additional workforce responsible first of all for putting on the masks and then for removing them either by dissolution or any other means and leads to an increase in the total duration and the cost of the treatment.
Par ailleurs, pour que la couche d'oxyde joue son rôle de barrière thermique avec suffisamment d'efficacité, il faut que son épaisseur soit au moins égale à 50 µm d'où la nécessité de mener l'anodisation jusqu'à l'établissement de fortes tensions anode-cathode. Dans ces conditions, on risque de détériorer la couche par le phénomène de brûlure qui est une dissolution accélérée et localisée de ladite couche sous l'effet d'une concentration élevée des densités de courant en certains points et qui entraîne de fortes élévations locales de température. Pour supprimer ce risque, on doit se limiter à l'utilisation de densités de courant inférieures à 10 A/dm² et à prolonger de ce fait la durée d'anodisation au-delà d'une demi-heure pour obtenir une épaisseur convenable d'oxyde.Furthermore, for the oxide layer to play its role of thermal barrier with sufficient efficiency, its thickness must be at least equal to 50 μm, hence the need to carry out anodization until establishment. high anode-cathode voltages. Under these conditions, there is a risk of damaging the layer by the burning phenomenon which is an accelerated and localized dissolution of said layer under the effect of a high concentration of current densities at certain points and which leads to strong local temperature increases. . To eliminate this risk, one must limit oneself to the use of current densities of less than 10 A / dm² and thereby extend the anodization time beyond half an hour to obtain a suitable thickness of oxide.
Il faut encore que cette couche présente une bonne tenue à la fatigue thermique et qu'elle soit suffisamment dure afin de ne pas se disloquer lors du fonctionnement du piston. Pour parvenir à ce résultat, il est connu de procéder après anodisation à certains traitements tels qu'une compression de la couche comme cela est revendiqué par exemple dans le brevet français 2 354 450.It is also necessary that this layer has good resistance to thermal fatigue and that it is sufficiently hard so as not to fall apart during the operation of the piston. To achieve this result, it is known to carry out after anodization certain treatments such as compression of the layer as claimed, for example, in French patent 2,354,450.
Consciente des problèmes que pose l'obtention de pistons revêtus de barrières thermiques convenables, la demanderesse a cherché et trouvé une solution qui supprime à la fois l'utilisation des masques, les durées prolongées d'anodisation et qui confère à la couche d'oxyde les propriétés requises et ce sans avoir recours à d'autres opérations que l'anodisation proprement dite.Aware of the problems involved in obtaining pistons coated with suitable thermal barriers, the Applicant has sought and found a solution which eliminates both the use of masks, the prolonged anodization times and which gives the oxide layer the required properties without having to resort to any operations other than anodization proper.
Cette solution consiste à mettre en oeuvre un dispositif de traitement par anodisation de pistons en alliage d'aluminium utilisés dans les moteurs à combustion interne caractérisé en ce que la surface latérale cylindrique dudit piston est reliée au pôle positif d'une source de courant continu par au moins deux pièces appliquées symétriquement sur ladite surface, qu'elle est équipée le long d'une directrice située à proximité de la tête d'un déflecteur en matériau isolant de l'électricité dont le pourtour est recourbé vers le bas, dont la surface côté tête est placée en regard d'une électrode reliée au pôle négatif de la source de courant et percée d'au moins une ouverture permettant le passage d'un flux régulé d'électrolyte d'anodisation dirigé vers la tête et dont la surface en regard de ladite électrode est munie d'un joint souple qui s'appuie sur la surface du piston.This solution consists in using a device for treating by anodizing aluminum alloy pistons used in internal combustion engines, characterized in that the cylindrical lateral surface of said piston is connected to the positive pole of a direct current source by at least two parts applied symmetrically on said surface, which it is equipped along a director located near the head of a deflector made of electrically insulating material whose periphery is curved downwards, whose surface head side is placed opposite an electrode connected to the negative pole of the current source and pierced with at least one opening allowing the passage of a regulated flow of electrolyte anodizing directed towards the head and whose surface facing said electrode is provided with a flexible seal which rests on the surface of the piston.
Dans cette invention, le piston est donc relié au pôle positif d'une source de courant continu, par au moins deux pièces placées symétriquement par rapport à l'axe du piston et appliquées contre sa surface latérale de manière à avoir une bonne répartition du courant et à obtenir une couche anodisée homogène.In this invention, the piston is therefore connected to the positive pole of a direct current source, by at least two parts placed symmetrically with respect to the axis of the piston and applied against its lateral surface so as to have a good distribution of the current. and to obtain a homogeneous anodized layer.
La surface latérale du piston est équipée d' un déflecteur, sorte de plat de préférence circulaire et dont le pourtour est recourbé vers le bas suivant un profil adapté à l'écoulement de l'électrolyte. Ce déflecteur s appuie le long d'une directrice du piston située le plus près possible de la tête et a pour fonction de faire écran à tout passage d'électrolyte vers le haut du piston et ainsi à limiter l'effet d'anodisation presque exclusivement à la tête.The lateral surface of the piston is equipped with a deflector, a sort of preferably circular dish, the periphery of which is curved downwards according to a profile adapted to the flow of the electrolyte. This deflector is supported along a director of the piston located as close as possible to the head and has the function of shielding any passage of electrolyte towards the top of the piston and thus limiting the effect of anodization almost exclusively in the head.
Comme il n'est pas aisé de réaliser une étanchéité totale entre le déflecteur et la surface latérale du piston, ni même de placer ce dernier au niveau de la tête, il est préférable de le munir d'un joint d'étanchéité qui vient s'appuyer sur ladite surface jusqu 'au niveau de la tête.As it is not easy to achieve a complete seal between the deflector and the lateral surface of the piston, or even to place the latter at the level of the head, it is preferable to provide it with a seal which comes 'press on said surface up to the level of the head.
La matière utilisée pour réaliser ce déflecteur peut être tout matériau isolant de l'électricité susceptible d'être convenablement mis en forme.The material used to make this deflector can be any material insulating from electricity capable of being suitably shaped.
En regard de la surface de ce déflecteur, côté tête, est placée une électrode ayant de préférence une forme circulaire et dont le pourtour est légèrement recourbé vers le bas. Cette électrode est reliée au pôle négatif de ladite source de courant et percée de préférence en son centre par au moins une ouverture.Opposite the surface of this deflector, on the head side, is placed an electrode preferably having a circular shape and the periphery of which is slightly curved downwards. This electrode is connected to the negative pole of said current source and preferably pierced in its center by at least one opening.
Au travers de cette ouverture passe un flux régulé d'électrolyte amené par une tuyauterie d'alimentation et qui vient lécher la tête du piston et l'anodiser avant de s'échapper par l'espace annulaire existant entre le déflecteur et l'électrode dans une direction qui épouse le profil du d'alimentation éventuellement après avoir été refroidi. La régulation du flux d'électrolyte peut être obtenue par tout moyen connu tel que pompe volumétrique ou système d'alimentation sous pression hydrostatique constante.Through this opening passes a regulated flow of electrolyte brought in by a supply pipe and which licks the head of the piston and anodizes it before escaping through the annular space existing between the deflector and the electrode in a management that follows the profile of possibly after being cooled. Regulation of the electrolyte flow can be obtained by any known means such as a positive displacement pump or a supply system under constant hydrostatic pressure.
Il est évident que les circuits en contact avec l'électrolyte sont réalisés en un matériau inerte chimiquement vis-à-vis de ce dernier.It is obvious that the circuits in contact with the electrolyte are made of a material which is chemically inert towards the latter.
Un tel dispositif permet de remédier aux inconvénients cités plus haut. En effet, d'une part, en raison de la présence du déflecteur et éventuellement du joint d'étanchéité, seule la tête du piston est anodisée et il n'est donc nul besoin de recourir à des masques ou épargnes.Such a device overcomes the drawbacks mentioned above. Indeed, on the one hand, due to the presence of the deflector and possibly of the seal, only the piston head is anodized and there is therefore no need to use masks or savings.
D'autre part, le passage d'un flux régulé d'électrolyte vers la tête permet de réaliser un régime hydrodynamique adapté aux dimensions de la surface à anodiser et assure une grande vitesse d'évacuation des calories de sorte qu'on peut augmenter notablement la densité de courant d'anodisation sans provoquer de "brûlure". De plus, la masse quasi entière du piston étant à l'air libre sert de dissipateur de calories et contribue également à la possibilité d'utilisation de fortes densités de courant.On the other hand, the passage of a regulated flow of electrolyte towards the head makes it possible to achieve a hydrodynamic regime adapted to the dimensions of the surface to be anodized and ensures a high speed of evacuation of the calories so that one can notably increase the density of anodizing current without causing "burn". In addition, the almost entire mass of the piston being in the open air serves as a heat sink and also contributes to the possibility of using high current densities.
Un tel dispositif conduit en outre à l'obtention de couches d'oxyde de forte épaisseur pouvant dépasser 70 µm et ce en moins de 5 minutes et ces couches présentent naturellement, c'est-à-dire sans aucun traitement ultérieur, une dureté et une résistance à la fatigue convenables.Such a device also leads to the production of thick oxide layers which can exceed 70 μm in less than 5 minutes and these layers naturally exhibit hardness, that is to say without any subsequent treatment. adequate fatigue strength.
L'invention sera mieux comprise à l'aide de la figure ci-jointe qui représente le dispositif en coupe axiale verticale.
On y distingue un piston 1 sur la paroi latérale duquel est fixé, au moyen des vis 2, l'alimentation 3 en courant reliée au pôle positif d'une source non représentée. Cette alimentation est solidaire du déflecteur 4 muni d'un joint souple 5. En regard de la tête 6 à anodiser est placée une électrode 7 percée en son centre de plusieurs ouvertures 8 à travers lesquelles passe un flux d'électrolyte 9 amené par la tuyauterie 10 reliée à un moyen de propulsion non représenté permettant d'assurer une alimentation régulière.The invention will be better understood using the attached figure which shows the device in vertical axial section.
There is a piston 1 on the side wall of which is fixed, by means of
L'invention peut être illustrée à l'aide de l'exemple d'application suivant :
Sur la paroi latérale d'un piston en alliage d'aluminium du type AS12UN (c'est-à-dire contenant en poids environ 12 % de silicium, 1 % de cuivre et 1 % de nickel comme éléments principaux d'addition), on a fixé une alimentation en courant continu reliée au pôle positif d'une source. Cette alimentation était solidaire d'un déflecteur ajusté à la paroi du piston. Une électrode en titane mûnie de trous était placée à 5 cm de la tête et reliée à une tuyauterie dans laquelle circulait l'électrolyte contenant 180 g/l de H₂SO₄ à 5° C. On a fait passer une densité de courant de 50 A/dm² pendant 3 minutes et obtenu une couche d'oxyde d'épaisseur 65 µm ne présentant aucune trace de brûlure. Différentes mesures ont alors été effectuées sur le piston. On a noté d'abord que la couche avait une dureté comprise entre 200 et 300 HV. Ce piston a ensuite été soumis à des essais de fatigue thermique dont le cycle est indiqué ci-dessous :
- passage de - 20° C à 350° C en 15 s.
- refroidissement air, 15 s.
- refroidissement eau, 15 s.
- séchage air, 15 s.The invention can be illustrated using the following example of application:
On the side wall of an aluminum alloy piston of the AS12UN type (that is to say containing by weight approximately 12% of silicon, 1% of copper and 1% of nickel as main elements of addition), a DC power supply connected to the positive pole of a source has been fixed. This supply was secured to a deflector adjusted to the wall of the piston. A titanium electrode matured with holes was placed 5 cm from the head and connected to a pipe through which the electrolyte containing 180 g / l of H₂SO₄ at 5 ° C. circulated. A current density of 50 A / dm² for 3 minutes and obtained a layer of oxide with a thickness of 65 μm showing no burn marks. Different measurements were then made on the piston. It was first noted that the layer had a hardness between 200 and 300 HV. This piston was then subjected to thermal fatigue tests, the cycle of which is indicated below:
- passage from - 20 ° C to 350 ° C in 15 s.
- air cooling, 15 s.
- water cooling, 15 s.
- air drying, 15 s.
Les essais ont été conduits jusqu 'à 6000 cycles. Après 1000 cycles, une légère porosité apparaissait. Mais ce n'est qu'après 5000 cycles que la couche commençait à se déliter. Des criques sont apparues à 6000 cycles, mais leur profondeur (0,5 mm) est moindre que dans un procédé conventionnel.The tests have been conducted up to 6000 cycles. After 1000 cycles, a slight porosity appeared. But it was only after 5000 cycles that the layer began to disintegrate. Cracks appeared at 6000 cycles, but their depth (0.5 mm) is less than in a conventional process.
Pour augmenter la dureté de la couche, des essais ont été repris dans les mêmes conditions et avec le même dispositif que précédemment, mais l'électrolyte avait la composition suivante :
Après anodisation à la même densité de courant, on a obtenu en moins de 5 min., une couche dont l'épaisseur est supérieure à 60 µm. Sa résistance en fatigue thermique était comparable à celle obtenue dans l'exemple précédent. Mais la dureté était supérieure à 400 HV, valeur qui est jugée suffisante pour l'application considérée.After anodizing at the same current density, in less than 5 min., A layer whose thickness is greater than 60 µm. Its resistance to thermal fatigue was comparable to that obtained in the previous example. However, the hardness was greater than 400 HV, a value which is considered sufficient for the application considered.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT90420272T ATE94917T1 (en) | 1989-06-07 | 1990-06-05 | DEVICE FOR ANODISING ALUMINUM ALLOY PISTONS USED IN COMBUSTION ENGINES. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8908138 | 1989-06-07 | ||
| FR8908138A FR2648187B1 (en) | 1989-06-07 | 1989-06-07 | ANODIZING TREATMENT DEVICE FOR ALUMINUM ALLOY PISTONS FOR USE IN INTERNAL COMBUSTION ENGINES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0402287A1 true EP0402287A1 (en) | 1990-12-12 |
| EP0402287B1 EP0402287B1 (en) | 1993-09-22 |
Family
ID=9382898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90420272A Expired - Lifetime EP0402287B1 (en) | 1989-06-07 | 1990-06-05 | Apparatus for anodising aluminium alloy pistons used in internal combustion engines |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US5032244A (en) |
| EP (1) | EP0402287B1 (en) |
| JP (1) | JPH0394099A (en) |
| KR (1) | KR910001092A (en) |
| AT (1) | ATE94917T1 (en) |
| AU (1) | AU622377B2 (en) |
| BR (1) | BR9002666A (en) |
| CA (1) | CA2018288A1 (en) |
| DD (1) | DD298005B5 (en) |
| DE (1) | DE69003456T2 (en) |
| ES (1) | ES2044511T3 (en) |
| FI (1) | FI902832A0 (en) |
| FR (1) | FR2648187B1 (en) |
| IS (1) | IS3581A7 (en) |
| NO (1) | NO902507L (en) |
| PT (1) | PT94280A (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5284554A (en) * | 1992-01-09 | 1994-02-08 | International Business Machines Corporation | Electrochemical micromachining tool and process for through-mask patterning of thin metallic films supported by non-conducting or poorly conducting surfaces |
| US5750014A (en) * | 1995-02-09 | 1998-05-12 | International Hardcoat, Inc. | Apparatus for selectively coating metal parts |
| US6126808A (en) * | 1998-03-23 | 2000-10-03 | Pioneer Metal Finishing | Method and apparatus for anodizing objects |
| JP2000277478A (en) * | 1999-03-25 | 2000-10-06 | Canon Inc | Anodization device and system, substrate processing device and method, and manufcature thereof |
| DE19960646A1 (en) * | 1999-12-16 | 2001-07-05 | Fed Mogul Deutschland Gmbh | Production of a thermally and mechanically loaded surface layer on cast pistons in I.C. engines comprises applying an aluminum layer to the surface of the component and anodizing |
| JP4505928B2 (en) * | 2000-02-29 | 2010-07-21 | 株式会社アドヴィックス | Wheel cylinder |
| US6425364B1 (en) | 2000-11-28 | 2002-07-30 | Bombardier Motor Corporation Of America | Two-stroke direct fuel injected marine engine having anodized piston ring grooves |
| JP3921074B2 (en) * | 2001-11-05 | 2007-05-30 | 株式会社日立製作所 | Anodizing method and apparatus |
| KR100715023B1 (en) * | 2005-04-22 | 2007-05-09 | 임경락 | Partial surface treatment for vehicle piston |
| US7879217B2 (en) * | 2005-12-02 | 2011-02-01 | Greatbatch Ltd. | Method of forming valve metal anode pellets for capacitors using forced convection of liquid electrolyte during anodization |
| US20110284385A1 (en) | 2010-05-21 | 2011-11-24 | Pioneer Metal Finishing | Method and Apparatus For Anodizing Objects |
| KR100992560B1 (en) | 2010-07-21 | 2010-11-05 | 주식회사 영산테크노 | Surface treatment apparatus of piston top ring and head portion |
| CN102719870B (en) * | 2012-07-04 | 2014-11-12 | 石家庄金刚凯源动力科技有限公司 | Flow rotating combined device for micro-arc oxidation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB727406A (en) * | 1951-11-16 | 1955-03-30 | Glacier Co Ltd | Improvements in or relating to aluminium or aluminium alloy journalled components |
| EP0232211A1 (en) * | 1986-02-05 | 1987-08-12 | Cegedur Pechiney Rhenalu | Process for treatment of aluminium surfaces which are intended to be coated with a fluorcarbon film |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2698832A (en) * | 1951-03-20 | 1955-01-04 | Standard Process Corp | Plating apparatus |
| US2745805A (en) * | 1952-01-16 | 1956-05-15 | Jr Hiram Jones | Adjustable masking shield for electro-polisher |
| US3573176A (en) * | 1968-07-19 | 1971-03-30 | Rca Corp | Selective anodization apparatus and process |
| US3799848A (en) * | 1971-04-01 | 1974-03-26 | S Bereday | Method for electrolytically coating anodized aluminum with polymers |
| US4118303A (en) * | 1976-08-30 | 1978-10-03 | Burroughs Corporation | Apparatus for chemically treating a single side of a workpiece |
-
1989
- 1989-06-07 FR FR8908138A patent/FR2648187B1/en not_active Expired - Fee Related
-
1990
- 1990-05-25 US US07/528,544 patent/US5032244A/en not_active Expired - Fee Related
- 1990-05-31 IS IS3581A patent/IS3581A7/en unknown
- 1990-06-04 JP JP2146043A patent/JPH0394099A/en active Granted
- 1990-06-05 DE DE90420272T patent/DE69003456T2/en not_active Expired - Fee Related
- 1990-06-05 EP EP90420272A patent/EP0402287B1/en not_active Expired - Lifetime
- 1990-06-05 AT AT90420272T patent/ATE94917T1/en not_active IP Right Cessation
- 1990-06-05 ES ES90420272T patent/ES2044511T3/en not_active Expired - Lifetime
- 1990-06-05 BR BR909002666A patent/BR9002666A/en not_active IP Right Cessation
- 1990-06-05 AU AU56804/90A patent/AU622377B2/en not_active Ceased
- 1990-06-05 CA CA002018288A patent/CA2018288A1/en not_active Abandoned
- 1990-06-06 NO NO90902507A patent/NO902507L/en unknown
- 1990-06-06 PT PT94280A patent/PT94280A/en not_active Application Discontinuation
- 1990-06-06 DD DD34137390A patent/DD298005B5/en not_active IP Right Cessation
- 1990-06-06 FI FI902832A patent/FI902832A0/en not_active IP Right Cessation
- 1990-06-07 KR KR1019900008308A patent/KR910001092A/en not_active Application Discontinuation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB727406A (en) * | 1951-11-16 | 1955-03-30 | Glacier Co Ltd | Improvements in or relating to aluminium or aluminium alloy journalled components |
| EP0232211A1 (en) * | 1986-02-05 | 1987-08-12 | Cegedur Pechiney Rhenalu | Process for treatment of aluminium surfaces which are intended to be coated with a fluorcarbon film |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0394099A (en) | 1991-04-18 |
| DE69003456T2 (en) | 1994-01-20 |
| NO902507L (en) | 1990-12-10 |
| NO902507D0 (en) | 1990-06-06 |
| PT94280A (en) | 1991-12-31 |
| BR9002666A (en) | 1991-08-20 |
| JPH0514796B2 (en) | 1993-02-25 |
| DD298005B5 (en) | 1994-07-07 |
| EP0402287B1 (en) | 1993-09-22 |
| DE69003456D1 (en) | 1993-10-28 |
| FR2648187A1 (en) | 1990-12-14 |
| AU622377B2 (en) | 1992-04-02 |
| KR910001092A (en) | 1991-01-30 |
| US5032244A (en) | 1991-07-16 |
| ES2044511T3 (en) | 1994-01-01 |
| ATE94917T1 (en) | 1993-10-15 |
| CA2018288A1 (en) | 1990-12-07 |
| AU5680490A (en) | 1990-12-13 |
| FI902832A0 (en) | 1990-06-06 |
| IS3581A7 (en) | 1990-12-08 |
| FR2648187B1 (en) | 1994-04-15 |
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