EP3619416B1 - Steel piston having a phosphate layer - Google Patents

Steel piston having a phosphate layer Download PDF

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Publication number
EP3619416B1
EP3619416B1 EP18722516.4A EP18722516A EP3619416B1 EP 3619416 B1 EP3619416 B1 EP 3619416B1 EP 18722516 A EP18722516 A EP 18722516A EP 3619416 B1 EP3619416 B1 EP 3619416B1
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EP
European Patent Office
Prior art keywords
piston
phosphate coating
coating
amorphous phosphate
steel piston
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EP18722516.4A
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German (de)
French (fr)
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EP3619416A1 (en
Inventor
Dominik Leitzmann
Monika BLÜMM
Margrit Dannenfeldt
Thomas Fuhrmann
Manfred HAACK
Jürgen LUBER
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Chemetall GmbH
Federal Mogul Nuernberg GmbH
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Chemetall GmbH
Federal Mogul Nuernberg GmbH
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Priority to PL18722516T priority Critical patent/PL3619416T3/en
Publication of EP3619416A1 publication Critical patent/EP3619416A1/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08—Orthophosphates
    • C23C22/18—Orthophosphates containing manganese cations
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08—Orthophosphates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/82—After-treatment
    • C23C22/83—Chemical after-treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/10—Pistons  having surface coverings
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2080/00—Special pretreatment of the material to be lubricated, e.g. phosphatising or chromatising of a metal

Definitions

  • the present invention relates to a steel piston, in particular for an internal combustion engine, with an amorphous phosphate layer and a method for producing the same.
  • Steel pistons for internal combustion engines are usually provided with a skirt coating to reduce friction against the cylinder and to avoid scuffing.
  • the WO 2006/061013 A1 discloses a piston with a lubricating varnish.
  • the DE 10 2012 215666 A1 discloses a lubricating varnish on a phosphate layer.
  • the piston In order to ensure the adhesion of the bonded coating over the entire service life of the piston, the piston must be pretreated.
  • manganese phosphating is used for this purpose, which is applied by means of an immersion process.
  • an interruption of the usual manufacturing process and manual handling of the piston is necessary. This can lead to contamination on the surface of the piston.
  • this object is achieved by a special phosphating process and a steel piston with an amorphous phosphate layer which can be obtained as a result and to which the lubricating varnish is applied.
  • the invention relates to a steel piston, preferably a steel piston for an internal combustion engine, which comprises an amorphous phosphate layer with a thickness of 0.05 ⁇ m to 3 ⁇ m in at least one area, the amorphous phosphate layer being obtainable by a phosphoric acid layer. containing solution is sprayed onto the piston surface, and a lubricating varnish is applied to the amorphous phosphate layer.
  • amorphous phosphate layer means that the layer has an amorphous structure in plan view.
  • This amorphous structure distinguishes the phosphate layer according to the invention from conventional manganese phosphate or zinc phosphate layers with a crystalline structure.
  • the amorphous structure of the layer influences the properties of the layer, such as its roughness and layer thickness.
  • the treatment with the phosphoric acid-containing solution in step (1) not only forms an amorphous phosphate layer, but also roughened the piston surface and removes any oxides present.
  • the amorphous phosphate layer formed according to the invention has capillaries and thereby enables better anchoring of the lubricating varnish, which thus also withstands high loads.
  • the amorphous phosphate layer also acts as a passivation layer, so that renewed oxidation of the piston is avoided.
  • a thin, amorphous phosphate layer can be applied by means of the invention.
  • this can be thinner than a conventional, crystalline phosphate layer. This in turn enables lower manufacturing tolerances.
  • the amorphous phosphate layer has a thickness of 0.05 ⁇ m to 3 ⁇ m, preferably 0.1 ⁇ m to 3 ⁇ m.
  • the amorphous phosphate layer can be applied to the entire piston or to individual areas, for example the piston skirt or the pin bore.
  • the layer is preferably applied to the entire piston.
  • a lubricating varnish (2) is applied to the amorphous phosphate layer.
  • step (3) a layer of manganese phosphate is applied to the flask obtained in this way.
  • the piston can also be coated exclusively with the anti-friction varnish.
  • the phosphoric acid-containing solution used is applied by spraying, so that the amorphous Phosphate layer can be generated inline. This avoids manual handling of the piston and reduces the risk of contaminating the surface of the piston. Furthermore, the method according to the invention can be integrated into the process for producing the piston at low cost.
  • the solution used in step (1) preferably contains a surfactant in addition to phosphoric acid (orthophosphoric acid). In this way, the wetting of the surface can be improved so that a more uniform layer is formed.
  • the solution can also contain other components. Nitrates, e.g. sodium nitrate, manganese nitrate and zinc nitrate, and / or sulfonates have proven to be suitable.
  • the concentration of phosphoric acid in the solution is 4% to 14% (g / g), in particular 6% to 12% (g / g).
  • the solution preferably has a pH of 1 to 3.
  • a temperature of 30.degree. C. to 80.degree. C., preferably 45.degree. C. to 65.degree. C., and a treatment time of 50 seconds to 500 seconds, preferably 100 seconds to 400 seconds, have proven to be particularly suitable for carrying out step (1) proven.
  • step (1) the solution must be removed from the surface of the flask, e.g. by rinsing.
  • Step (2) is carried out using a method known to the person skilled in the art.
  • a manganese phosphate layer can then be formed on the piston obtained by means of the method according to the invention. This process can be carried out in a manner known to the person skilled in the art.
  • the treatment of the steel piston according to the invention leads to better adhesion of the lubricating varnish.
  • the anti-friction varnish is preferably a anti-friction varnish that comprises a polymer matrix.
  • the usual starting materials for piston coatings such as, for example, phenolic resins, epoxy resins, polyamide, polyamide-imide and / or PTFE, can be used as the polymer matrix; phenolic resins and / or epoxy resins are preferred.
  • a crosslinkable polymer is used as the matrix for the coating, it is crosslinked after application.
  • the matrix can be crosslinked thermally or by means of radiation, for example by means of UV or IR radiation.
  • the anti-friction varnish furthermore particularly preferably comprises functional components, for example one or more solid lubricants.
  • the solid lubricant (s) used are preferably substances with a laminar-like crystallizing structure, such as, for example, graphite, MoS 2 , WS 2 , ⁇ -BN. Polymers such as PTFE can also be used.
  • Suitable anti-friction coatings are, for example, in DE 10 2009 002 716 A1 and 10 2009 002 715 A1 described.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

Technisches GebietTechnical area

Die vorliegende Erfindung betrifft einen Stahlkolben, insbesondere für einen Verbrennungsmotor, mit einer amorphen Phosphat-Schicht und ein Verfahren zur Erzeugung derselben.The present invention relates to a steel piston, in particular for an internal combustion engine, with an amorphous phosphate layer and a method for producing the same.

Stand der TechnikState of the art

Stahlkolben für Verbrennungsmotoren werden zur Verringerung der Reibung gegen den Zylinder und zur Vermeidung des Fressens in der Regel mit einer Schaftbeschichtung versehen. Häufig wird ein Gleitlack eingesetzt, der einen oder mehrere Festschmierstoffe, z.B. Graphit oder MoS2, enthält. Bei direktem Aufbringen auf den Kolben haftet der Gleitlack überwiegend durch mechanische Adhäsion. Die WO 2006/061013 A1 offenbart einen Kolben mit einem Gleitlack. Die DE 10 2012 215666 A1 offenbart einen Gleitlack auf einer Phosphatschicht.Steel pistons for internal combustion engines are usually provided with a skirt coating to reduce friction against the cylinder and to avoid scuffing. A lubricating varnish that contains one or more solid lubricants, such as graphite or MoS 2, is often used. When applied directly to the piston, the bonded coating adheres mainly through mechanical adhesion. the WO 2006/061013 A1 discloses a piston with a lubricating varnish. the DE 10 2012 215666 A1 discloses a lubricating varnish on a phosphate layer.

Um die Haftung des Gleitlacks über die gesamte Lebensdauer des Kolbens zu gewährleisten, muss der Kolben vorbehandelt werden. Im Stand der Technik wird dazu beispielsweise eine Manganphosphatierung verwendet, die mittel Tauchverfahren aufgebracht wird. Um den Tauchprozess durchführen zu können, ist eine Unterbrechung des üblichen Herstellungsprozesses und eine manuelle Handhabung des Kolbens notwendig. Dadurch kann es zu Verunreinigungen auf der Oberfläche des Kolbens kommen. Alternativ besteht die Möglichkeit, den Stahlkolben vor dem Aufbringen des Gleitlacks lediglich einem neutralen, alkalischen und/oder saurem Waschen zu unterziehen. Da bei diesem Vorgang die Oberfläche lediglich entfettet, aber nicht aufgeraut wird, wird so häufig nur eine unzureichende Haftung des Gleitlacks erreicht.In order to ensure the adhesion of the bonded coating over the entire service life of the piston, the piston must be pretreated. In the prior art, for example, manganese phosphating is used for this purpose, which is applied by means of an immersion process. In order to be able to carry out the immersion process, an interruption of the usual manufacturing process and manual handling of the piston is necessary. This can lead to contamination on the surface of the piston. Alternatively, there is the possibility of only subjecting the steel piston to a neutral, alkaline and / or acidic wash before the lubricating varnish is applied. Since during this process the surface is only degreased but not roughened, the bond of the bonded varnish is often insufficient.

Aus diesen Gründen besteht das Bedürfnis ein einfach auszuführendes und mit geringem Kostenaufwand verbundenes Verfahren bereitzustellen, das zu einer verbesserten Haftung des Gleitlacks auf dem Kolben führt.For these reasons, there is a need to provide a process that is simple to carry out and that is associated with low costs and that leads to improved adhesion of the lubricating varnish to the piston.

Überraschenderweise wird diese Aufgabe durch ein spezielles Phosphatierungsverfahren und einen Stahlkolben mit einer dadurch erhältlichen, amorphen Phosphat-Schicht, auf die der Gleitlack aufgebracht wird, gelöst.Surprisingly, this object is achieved by a special phosphating process and a steel piston with an amorphous phosphate layer which can be obtained as a result and to which the lubricating varnish is applied.

Detaillierte Beschreibung der ErfindungDetailed description of the invention

Die Erfindung betrifft einen Stahlkolben, bevorzugt einen Stahlkolben für einen Verbrennungsmotor, der zumindest in einem Bereich eine amorphe Phosphat-Schicht mit einer Dicke von 0,05 µm bis 3 µm umfasst, wobei die amorphe Phosphat-Schicht dadurch erhältlich ist, dass eine Phosphorsäure-haltige Lösung auf die Kolbenoberfläche gesprüht wird, und wobei auf die amorphe Phosphat-Schicht ein Gleitlack aufgebracht ist.The invention relates to a steel piston, preferably a steel piston for an internal combustion engine, which comprises an amorphous phosphate layer with a thickness of 0.05 μm to 3 μm in at least one area, the amorphous phosphate layer being obtainable by a phosphoric acid layer. containing solution is sprayed onto the piston surface, and a lubricating varnish is applied to the amorphous phosphate layer.

Erfindungsgemäß bedeutet der Begriff "amorphe Phosphat-Schicht", dass die Schicht in der Aufsicht eine amorphe Struktur aufweist.According to the invention, the term “amorphous phosphate layer” means that the layer has an amorphous structure in plan view.

Durch diese amorphe Struktur unterscheidet sich die erfindungsgemäße Phosphat-Schicht von herkömmlichen Manganphosphat- oder Zinkphosphat-Schichten mit kristalliner Struktur. Die amorphe Struktur der Schicht beeinflusst die Eigenschaften der Schicht, wie z.B. deren Rauheit und Schichtdicke.This amorphous structure distinguishes the phosphate layer according to the invention from conventional manganese phosphate or zinc phosphate layers with a crystalline structure. The amorphous structure of the layer influences the properties of the layer, such as its roughness and layer thickness.

Das erfindungsgemäße Verfahren zur Herstellung des erfindungsgemäßen Stahlkolbens umfasst die folgenden Schritte:

  1. (1) das Bilden einer amorphen Phosphat-Schicht durch Sprühen einer Lösung, die Phosphorsäure enthält, auf die Kolbenoberfläche;
  2. (2) das Aufbringen eines Gleitlacks; und
  3. (3) optional das Bilden einer Manganphosphat-Schicht.
The method according to the invention for producing the steel piston according to the invention comprises the following steps:
  1. (1) forming an amorphous phosphate layer by spraying a solution containing phosphoric acid, on the piston surface;
  2. (2) the application of a lubricating varnish; and
  3. (3) optionally forming a manganese phosphate layer.

Durch die Behandlung mit der Phosphorsäure-haltigen Lösung in Schritt (1) wird nicht nur eine amorphe Phosphat-Schicht gebildet, sondern die Kolbenoberfläche zusätzlich aufgeraut und von vorhandenen Oxiden befreit.The treatment with the phosphoric acid-containing solution in step (1) not only forms an amorphous phosphate layer, but also roughened the piston surface and removes any oxides present.

Die erfindungsgemäß gebildete, amorphe Phosphat-Schicht weist Kapillaren auf und ermöglicht dadurch eine bessere Verankerung des Gleitlacks, der somit auch hohen Belastungen standhält. Ferner wirkt die amorphe Phosphat-Schicht als Passivierungsschicht, so dass eine erneute Oxidation des Kolbens vermieden wird.The amorphous phosphate layer formed according to the invention has capillaries and thereby enables better anchoring of the lubricating varnish, which thus also withstands high loads. The amorphous phosphate layer also acts as a passivation layer, so that renewed oxidation of the piston is avoided.

Mittels der Erfindung kann eine dünne, amorphe Phosphat-Schicht aufgebracht werden. Insbesondere kann diese dünner sein als eine herkömmliche, kristalline Phosphat-Schicht. Dies wiederum ermöglicht geringere Fertigungstoleranzen. Die amorphe Phosphat-Schicht hat eine Dicke von 0,05 µm bis 3 µm, bevorzugt 0,1 µm bis 3 µm.A thin, amorphous phosphate layer can be applied by means of the invention. In particular, this can be thinner than a conventional, crystalline phosphate layer. This in turn enables lower manufacturing tolerances. The amorphous phosphate layer has a thickness of 0.05 μm to 3 μm, preferably 0.1 μm to 3 μm.

Im Rahmen der Erfindung kann die amorphe Phosphat-Schicht auf den gesamten Kolben oder einzelne Bereiche, beispielsweise den Kolbenschaft oder die Bolzenbohrung, aufgebracht werden. Bevorzugt wird die Schicht auf den gesamten Kolben aufgebracht.In the context of the invention, the amorphous phosphate layer can be applied to the entire piston or to individual areas, for example the piston skirt or the pin bore. The layer is preferably applied to the entire piston.

Auf die amorphe Phosphat-Schicht wird ein Gleitlack (2) aufgebracht. Auf den so erhaltenen Kolben wird gegebenenfalls in Schritt (3) eine Manganphosphat-Schicht aufgebracht.A lubricating varnish (2) is applied to the amorphous phosphate layer. In step (3), a layer of manganese phosphate is applied to the flask obtained in this way.

Selbstverständlich kann der Kolben auch ausschließlich mit dem Gleitlack beschichtet werden.Of course, the piston can also be coated exclusively with the anti-friction varnish.

Erfindungsgemäß wird die eingesetzte Phosphorsäure-haltige Lösung durch Sprühen aufgebracht, so dass die amorphe Phosphat-Schicht inline erzeugt werden kann. Dadurch lässt sich eine manuelle Handhabung des Kolbens vermeiden, und die Gefahr der Verunreinigung der Oberfläche des Kolbens wird reduziert. Ferner lässt sich das erfindungsgemäße Verfahren ohne große Kosten in den Ablauf zur Herstellung des Kolbens integrieren.According to the invention, the phosphoric acid-containing solution used is applied by spraying, so that the amorphous Phosphate layer can be generated inline. This avoids manual handling of the piston and reduces the risk of contaminating the surface of the piston. Furthermore, the method according to the invention can be integrated into the process for producing the piston at low cost.

Bevorzugt enthält die in Schritt (1) eingesetzte Lösung neben Phosphorsäure (ortho-Phosphorsäure) ein Tensid. Auf diese Weise lässt sich die Benetzung der Oberfläche verbessern, sodass eine gleichmäßigere Schicht gebildet wird. Ferner kann die Lösung weitere Bestandteile enthalten. Als geeignet haben sich Nitrate, z.B. Natriumnitrat, Mangannitrat und Zinknitrat, und/oder Sulfonate erwiesen.The solution used in step (1) preferably contains a surfactant in addition to phosphoric acid (orthophosphoric acid). In this way, the wetting of the surface can be improved so that a more uniform layer is formed. The solution can also contain other components. Nitrates, e.g. sodium nitrate, manganese nitrate and zinc nitrate, and / or sulfonates have proven to be suitable.

In einer bevorzugten Ausführungsform beträgt die Konzentration von Phosphorsäure in der Lösung 4% bis 14% (g/g), insbesondere 6% bis 12% (g/g). Die Lösung hat bevorzugt einen pH-Wert von 1 bis 3.In a preferred embodiment, the concentration of phosphoric acid in the solution is 4% to 14% (g / g), in particular 6% to 12% (g / g). The solution preferably has a pH of 1 to 3.

Für die Durchführung von Schritt (1) haben sich eine Temperatur von 30°C bis 80°C, bevorzugt 45°C bis 65°C, und eine Behandlungsdauer von 50 Sekunden bis 500 Sekunden, bevorzugt 100 Sekunden bis 400 Sekunden, als besonders geeignet erwiesen.A temperature of 30.degree. C. to 80.degree. C., preferably 45.degree. C. to 65.degree. C., and a treatment time of 50 seconds to 500 seconds, preferably 100 seconds to 400 seconds, have proven to be particularly suitable for carrying out step (1) proven.

Nach Beendigung des Schrittes (1) muss die Lösung, z.B. durch Spülen, von der Oberfläche des Kolbens entfernt werden.After completing step (1), the solution must be removed from the surface of the flask, e.g. by rinsing.

Im Anschluss an Schritt (1) wird mittels des Schrittes (2) ein Gleitlack aufgebracht. Schritt (2) wird mit einem dem Fachmann bekannten Verfahren durchgeführt.Following step (1), a lubricating varnish is applied by means of step (2). Step (2) is carried out using a method known to the person skilled in the art.

Auf dem mittels des erfindungsgemäßen Verfahrens erhaltenen Kolben kann anschließend in einem weiteren Schritt (3) eine Manganphosphat-Schicht gebildet werden. Dieser Vorgang kann in einer dem Fachmann bekannten Weise durchgeführt werden.In a further step (3), a manganese phosphate layer can then be formed on the piston obtained by means of the method according to the invention. This process can be carried out in a manner known to the person skilled in the art.

Wie oben ausgeführt, führt die erfindungsgemäße Behandlung des Stahlkolbens zu einer besseren Haftung des Gleitlacks.As stated above, the treatment of the steel piston according to the invention leads to better adhesion of the lubricating varnish.

Bei dem Gleitlack handelt es sich bevorzugt um einen Gleitlack, der eine Polymermatrix umfasst. Als Polymermatrix können die üblichen Ausgangsstoffe für Kolbenbeschichtungen, wie beispielsweise Phenolharze, Epoxidharze, Polyamid, Polyamidimid und/oder PTFE eingesetzt werden, bevorzugt sind Phenolharze und/oder Epoxidharze.The anti-friction varnish is preferably a anti-friction varnish that comprises a polymer matrix. The usual starting materials for piston coatings, such as, for example, phenolic resins, epoxy resins, polyamide, polyamide-imide and / or PTFE, can be used as the polymer matrix; phenolic resins and / or epoxy resins are preferred.

Wird als Matrix für die Beschichtung ein vernetzbares Polymer eingesetzt, so wird diese nach dem Aufbringen vernetzt. Das Vernetzen der Matrix kann thermisch oder mittels Strahlung, beispielsweise durch UV- oder IR-Strahlung, erfolgen.If a crosslinkable polymer is used as the matrix for the coating, it is crosslinked after application. The matrix can be crosslinked thermally or by means of radiation, for example by means of UV or IR radiation.

Der Gleitlack umfasst weiterhin besonders bevorzugt funktionelle Bestandteile, beispielsweise einen oder mehrere Festschmierstoffe. Erfindungsgemäß werden als Festschmierstoff(e) bevorzugt Stoffe mit einer laminarartig kristallisierenden Struktur eingesetzt, wie beispielsweise Graphit, MoS2, WS2, α-BN. Ferner können Polymere, wie z.B. PTFE eingesetzt werden.The anti-friction varnish furthermore particularly preferably comprises functional components, for example one or more solid lubricants. According to the invention, the solid lubricant (s) used are preferably substances with a laminar-like crystallizing structure, such as, for example, graphite, MoS 2 , WS 2 , α-BN. Polymers such as PTFE can also be used.

Geeignete Gleitlacke, deren Haftung mittels der erfindungsgemäßen amorphen Phosphat-Schicht verbessert werden kann, sind z.B. in der DE 10 2009 002 716 A1 und 10 2009 002 715 A1 beschrieben.Suitable anti-friction coatings, the adhesion of which can be improved by means of the amorphous phosphate layer according to the invention, are, for example, in DE 10 2009 002 716 A1 and 10 2009 002 715 A1 described.

Claims (10)

  1. Steel piston, in particular a steel piston for an internal combustion engine, having, at least in one region, an amorphous phosphate coating with a thickness of 0.05 µm to 3 µm, wherein the amorphous phosphate coating can be obtained in that a phosphoric acid-containing solution is sprayed onto the piston surface, and wherein an anti-friction coating is applied to the amorphous phosphate coating.
  2. Steel piston according to claim 1, wherein the amorphous phosphate coating has a thickness of 0.1 µm to 3 µm.
  3. Steel piston according to claim 1 or 2, wherein a manganese phosphate coating is further applied to the amorphous phosphate coating.
  4. Steel piston according to claim 1 to 3, wherein the coating(s) is/are applied at least to the piston shaft and/or the pin bore, preferably to the entire piston,.
  5. Method for the production of a steel piston according to one of the claims 1 to 4, comprising:
    (1) forming an amorphous phosphate coating by spraying a solution containing phosphoric acid onto the piston surface;
    (2) applying an anti-friction coating; and
    (3) optionally, forming a manganese phosphate coating.
  6. Method according to claim 5, wherein the solution used in step (1) also contains a surfactant.
  7. Method according to claim 5 or 6, wherein the phosphoric acid concentration in the solution is 4% to 14% (g/g).
  8. Method according to one of the claims 5 to 7, wherein the solution used in step (1) has a pH value of 1 to 3.
  9. Method according to one of the claims 5 to 8, wherein the treatment in step (1) is carried out at a temperature of 30°C to 80°C for 50 seconds to 500 seconds.
  10. Use of an amorphous phosphate coating to improve the adhesion of an anti-friction coating to a steel piston, wherein the phosphate coating has a thickness of 0.05 µm to 3 µm and can be obtained in that a phosphoric acid-containing solution is sprayed onto the piston surface, and wherein the anti-friction coating is applied to the amorphous phosphate coating.
EP18722516.4A 2017-05-05 2018-05-04 Steel piston having a phosphate layer Active EP3619416B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18722516T PL3619416T3 (en) 2017-05-05 2018-05-04 Steel piston having a phosphate layer

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DE102017207591.0A DE102017207591A1 (en) 2017-05-05 2017-05-05 Steel piston with a phosphate layer
PCT/EP2018/061497 WO2018202849A1 (en) 2017-05-05 2018-05-04 Steel piston having a phosphate layer

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EP3619416A1 EP3619416A1 (en) 2020-03-11
EP3619416B1 true EP3619416B1 (en) 2021-10-13

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US (1) US20200102656A1 (en)
EP (1) EP3619416B1 (en)
CN (1) CN110892142B (en)
BR (1) BR112019023182A2 (en)
DE (1) DE102017207591A1 (en)
PL (1) PL3619416T3 (en)
RU (1) RU2769041C2 (en)
WO (1) WO2018202849A1 (en)

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SE441105B (en) * 1976-04-05 1985-09-09 Amchem Prod PROCEDURE FOR PREPARING AN AMORPH, LIGHT, HARD FIXED PHOSPHATE COATING
GB2148950B (en) * 1983-10-26 1987-02-04 Pyrene Chemical Services Ltd Phosphating composition and processes
US5597465A (en) * 1994-08-05 1997-01-28 Novamax Itb S.R.L. Acid aqueous phosphatic solution and process using same for phosphating metal surfaces
DE4433946A1 (en) * 1994-09-23 1996-03-28 Henkel Kgaa Phosphating process without rinsing
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JP2000249063A (en) * 1999-02-26 2000-09-12 Toyota Autom Loom Works Ltd Piston for piston type compressor
JP2000313967A (en) * 1999-04-27 2000-11-14 Sumitomo Metal Ind Ltd Surface treated steel sheet excellent in corrosion resistance
US20040118483A1 (en) * 2002-12-24 2004-06-24 Michael Deemer Process and solution for providing a thin corrosion inhibiting coating on a metallic surface
DE102005055365A1 (en) * 2004-12-10 2006-06-22 Mahle International Gmbh Piston for an internal combustion engine and method for coating its hub bores
ES2423901T3 (en) * 2005-03-29 2013-09-25 Nippon Steel & Sumitomo Metal Corporation Threaded joint for steel pipes
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DE102005042474A1 (en) * 2005-09-07 2007-03-08 Ks Aluminium-Technologie Ag Coating of a thermally and erosively loaded functional component, and a release agent and a method for producing the coating
JP5021396B2 (en) * 2007-08-24 2012-09-05 日本ピストンリング株式会社 piston ring
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DE102009002716A1 (en) 2009-04-29 2010-11-11 Federal-Mogul Nürnberg GmbH Wear-resistant bonded coating for the coating of engine pistons
DE102009002715B4 (en) 2009-04-29 2017-02-09 Federal-Mogul Nürnberg GmbH Use of a waterborne lubricating varnish for the coating of engine pistons
DE102012215666A1 (en) * 2012-09-04 2014-03-06 Schaeffler Technologies AG & Co. KG Functional part, preferably bearing part, sealing or O-ring, useful in bearing of engine compartment of internal combustion engine, comprises base body with partially provided friction-reducing coating comprising lubricating paint
DE102014001248A1 (en) * 2014-02-03 2015-08-06 Gkn Sinter Metals Engineering Gmbh Connecting rod and piston assembly with a connecting rod with ball head
DE102014217040A1 (en) * 2014-08-27 2016-03-03 Bayerische Motoren Werke Aktiengesellschaft Coating for metal components, method for coating a metal component, pistons for internal combustion engines and motor vehicles
RU156583U1 (en) * 2015-05-08 2015-11-10 Федеральное государственное унитарное предприятие "Центральный институт авиационного моторостроения им. П.И. Баранова" PISTON OF THE INTERNAL COMBUSTION ENGINE CYLINDER

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RU2019139407A (en) 2021-06-07
CN110892142B (en) 2022-12-06
US20200102656A1 (en) 2020-04-02
EP3619416A1 (en) 2020-03-11
BR112019023182A2 (en) 2020-05-19
RU2019139407A3 (en) 2021-10-06
RU2769041C2 (en) 2022-03-28
DE102017207591A1 (en) 2018-11-08
CN110892142A (en) 2020-03-17
WO2018202849A1 (en) 2018-11-08
PL3619416T3 (en) 2022-03-07

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