EP3619416A1 - Steel piston having a phosphate layer - Google Patents

Steel piston having a phosphate layer

Info

Publication number
EP3619416A1
EP3619416A1 EP18722516.4A EP18722516A EP3619416A1 EP 3619416 A1 EP3619416 A1 EP 3619416A1 EP 18722516 A EP18722516 A EP 18722516A EP 3619416 A1 EP3619416 A1 EP 3619416A1
Authority
EP
European Patent Office
Prior art keywords
phosphate layer
piston
steel
steel piston
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18722516.4A
Other languages
German (de)
French (fr)
Other versions
EP3619416B1 (en
Inventor
Dominik Leitzmann
Monika BLÜMM
Margrit Dannenfeldt
Thomas Fuhrmann
Manfred HAACK
Jürgen LUBER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chemetall GmbH
Federal Mogul Nuernberg GmbH
Original Assignee
Chemetall GmbH
Federal Mogul Nuernberg GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chemetall GmbH, Federal Mogul Nuernberg GmbH filed Critical Chemetall GmbH
Priority to PL18722516T priority Critical patent/PL3619416T3/en
Publication of EP3619416A1 publication Critical patent/EP3619416A1/en
Application granted granted Critical
Publication of EP3619416B1 publication Critical patent/EP3619416B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
  • Eating usually provided with a shaft coating.
  • a bonded coating which contains one or more solid lubricants, eg graphite or M0S 2 .
  • solid lubricants eg graphite or M0S 2 .
  • 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.
  • a manganese phosphating is used, which is applied by means of dipping method.
  • 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.
  • the steel piston it is possible for the steel piston to be only neutral, before applying the lubricating varnish.
  • this object is achieved by a special phosphating process and a steel piston with an available, amorphous phosphate layer.
  • the invention relates to a steel piston, preferably a steel piston for an internal combustion engine, which comprises an amorphous phosphate layer at least in one region. Furthermore, the invention relates to a method for producing such a steel piston.
  • amorphous phosphate layer means that the layer has an amorphous structure in plan view.
  • Manganese phosphate or zinc phosphate layers with crystalline structure with crystalline structure.
  • the amorphous structure of the layer affects the properties of the layer, e.g. their roughness and
  • the method according to the invention comprises the following
  • step (3) optionally forming a manganese phosphate layer.
  • the amorphous phosphate layer formed according to the invention has capillaries and thereby enables a better
  • the amorphous phosphate layer acts as a passivation layer, so that a renewed oxidation of the piston is avoided.
  • a thin, amorphous phosphate layer can be applied.
  • it may be thinner than a conventional, crystalline phosphate layer. This in turn allows lower manufacturing tolerances.
  • the amorphous phosphate layer has a thickness of 0.05 ym to 5 ym, more preferably 0.1 ym to 3 ym.
  • the amorphous phosphate layer can be applied to the entire piston or individual regions, for example the piston skirt or the pin bore.
  • the layer is applied to the entire piston
  • a lubricating varnish (2) may further be applied to the amorphous phosphate layer. If appropriate, in step (3) on the piston thus obtained
  • the piston can also be coated exclusively with the lubricating varnish.
  • the phosphoric acid-containing solution used according to the invention can be applied by spraying, so that the amorphous phosphate layer can be generated inline. By doing so leaves avoid manual handling of the piston, and the risk of contamination of the surface of the piston is reduced.
  • the inventive method can be integrated into the process for producing the piston without great expense.
  • the solution used in step (1) preferably contains a surfactant in addition to phosphoric acid (ortho-phosphoric acid). In this way, the wetting of the surface can be improved, so that a more uniform layer is formed. Further, the solution may contain other ingredients.
  • Suitable nitrates e.g. Sodium nitrate, manganese nitrate and
  • Zinc nitrate, and / or sulfonates proved.
  • the nitrate, and / or sulfonates proved.
  • the solution preferably has a pH of from 1 to 3.
  • step (1) After completion of step (1), the solution, e.g. by rinsing, be removed from the surface of the flask.
  • step (2) is carried out by a method known to the person skilled in the art.
  • a manganese phosphate layer can subsequently be formed in a further step (3).
  • This process can be carried out in a manner known to those skilled in the art.
  • the treatment according to the invention of the steel piston leads to a better adhesion of the lubricating varnish.
  • the lubricating varnish is preferably one
  • Anti-friction varnish comprising a polymer matrix.
  • a polymer matrix the usual starting materials for piston coatings, such as phenolic resins, epoxy resins, polyamide,
  • Polyamide-imide and / or PTFE are used, preferred are phenolic resins and / or epoxy resins.
  • a crosslinkable polymer is used as the matrix for the coating, then it is crosslinked after application.
  • the crosslinking of the matrix can be effected thermally or by means of radiation, for example by UV or IR radiation.
  • the bonded coating further particularly preferred
  • Solid lubricant (s) preferably substances with a laminar crystallizing structure used, such as graphite, M0S2, WS2, -BN. Furthermore, polymers such as e.g. PTFE can be used.
  • amorphous phosphate layer according to the invention can be improved, are e.g. in DE 10 2009 002 716 AI and 10 2009 002 715 AI 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)

Abstract

The invention relates to a steel piston for an internal combustion engine, comprising an amorphous phosphate layer in at least one region thereof. Said layer improves adhesion of a solid film lubricant.

Description

Stahlkolben mit einer Phosphat-Schicht  Steel piston with a phosphate layer
Technisches Gebiet Technical area
Die vorliegende Erfindung betrifft einen Stahlkolben, The present invention relates to a steel piston,
insbesondere für einen Verbrennungsmotor, mit einer amorphen Phosphat-Schicht und ein Verfahren zur Erzeugung derselben. in particular for an internal combustion engine, with an amorphous phosphate layer and a method for producing the same.
Stand der Technik Stahlkolben für Verbrennungsmotoren werden zur Verringerung der Reibung gegen den Zylinder und zur Vermeidung des Prior art steel pistons for internal combustion engines are used to reduce friction against the cylinder and to avoid the
Fressens in der Regel mit einer Schaftbeschichtung versehen. Häufig wird ein Gleitlack eingesetzt, der einen oder mehrere Festschmierstoffe, z.B. Graphit oder M0S2, enthält. Bei direktem Aufbringen auf den Kolben haftet der Gleitlack überwiegend durch mechanische Adhäsion. Eating usually provided with a shaft coating. Frequently, a bonded coating is used which contains one or more solid lubricants, eg graphite or M0S 2 . When applied directly to the piston of the bonded coating adheres mainly by mechanical adhesion.
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. 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, a manganese phosphating is used, which is applied by means of dipping method. In order to perform the dipping 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.
Alternativ besteht die Möglichkeit, den Stahlkolben vor dem Aufbringen des Gleitlacks lediglich einem neutralen, Alternatively, it is possible for the steel piston to be only neutral, before applying the lubricating varnish.
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. Aus diesen Gründen besteht das Bedürfnis ein einfach to undergo alkaline and / or acidic washing. Since in this process, the surface is only degreased, but not roughened, so often only insufficient adhesion of the bonded coating is achieved. For these reasons, the need is simple
auszuführendes und mit geringem Kostenaufwand verbundenes Verfahren bereitzustellen, das zu einer verbesserten Haftung des Gleitlacks auf dem Kolben führt. To provide to perform and associated with low cost process, which leads to improved adhesion of the bonded coating on the piston.
Überraschenderweise wird diese Aufgabe durch ein spezielles Phosphatierungsverfahren und einen Stahlkolben mit einer dadurch erhältlichen, amorphen Phosphat-Schicht gelöst. Surprisingly, this object is achieved by a special phosphating process and a steel piston with an available, amorphous phosphate layer.
Detaillierte Beschreibung der Erfindung Detailed description of the invention
Die Erfindung betrifft einen Stahlkolben, bevorzugt einen Stahlkolben für einen Verbrennungsmotor, der zumindest in einem Bereich eine amorphe Phosphat-Schicht umfasst. Ferner betrifft die Erfindung ein Verfahren zur Herstellung eines solchen Stahlkolbens. The invention relates to a steel piston, preferably a steel piston for an internal combustion engine, which comprises an amorphous phosphate layer at least in one region. Furthermore, the invention relates to a method for producing such a steel piston.
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 This amorphous structure makes the difference
erfindungsgemäße Phosphat-Schicht von herkömmlichen Inventive phosphate layer of conventional
Manganphosphat- oder Zinkphosphat-Schichten mit kristalliner Struktur. Die amorphe Struktur der Schicht beeinflusst die Eigenschaften der Schicht, wie z.B. deren Rauheit und Manganese phosphate or zinc phosphate layers with crystalline structure. The amorphous structure of the layer affects the properties of the layer, e.g. their roughness and
Schichtdicke . Layer thickness.
Das erfindungsgemäße Verfahren umfasst die folgenden The method according to the invention comprises the following
Schritte : Steps :
(1) das Bilden einer amorphen Phosphat-Schicht durch (1) forming an amorphous phosphate layer
Behandlung mit einer Lösung, die Phosphorsäure enthält ;  Treatment with a solution containing phosphoric acid;
(2) optional das Aufbringen eines Gleitlacks; und (2) optionally, the application of a lubricating varnish; and
(3) optional das Bilden einer Manganphosphat-Schicht. 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. (3) optionally forming a manganese phosphate layer. By the treatment with the phosphoric acid-containing solution in step (1), not only is an amorphous phosphate layer formed, but the surface of the piston is additionally roughened and freed from existing oxides.
Die erfindungsgemäß gebildete amorphe Phosphat-Schicht weist Kapillaren auf und ermöglicht dadurch eine bessere The amorphous phosphate layer formed according to the invention has capillaries and thereby enables a better
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. Anchoring of the bonded coating, which thus withstands high loads. Furthermore, the amorphous phosphate layer acts as a passivation layer, so that a 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. By means of the invention, a thin, amorphous phosphate layer can be applied. In particular, it may be thinner than a conventional, crystalline phosphate layer. This in turn allows lower manufacturing tolerances.
Bevorzugt hat die amorphe Phosphat-Schicht eine Dicke von 0,05 ym bis 5 ym, besonders bevorzugt 0,1 ym bis 3 ym. Preferably, the amorphous phosphate layer has a thickness of 0.05 ym to 5 ym, more preferably 0.1 ym to 3 ym.
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 In the context of the invention, the amorphous phosphate layer can be applied to the entire piston or individual regions, for example the piston skirt or the pin bore. Preferably, the layer is applied to the entire piston
aufgebracht. applied.
Wenn gewünscht, kann ferner ein Gleitlack (2) auf die amorphe Phosphat-Schicht aufgebracht werden. Auf den so erhaltenen Kolben wird gegebenenfalls in Schritt (3) eine If desired, a lubricating varnish (2) may further be applied to the amorphous phosphate layer. If appropriate, in step (3) on the piston thus obtained
Manganphosphat-Schicht aufgebracht. Manganese phosphate layer applied.
Selbstverständlich kann der Kolben auch ausschließlich mit dem Gleitlack beschichtet werden. Die erfindungsgemäß eingesetzte Phosphorsäure-haltige Lösung kann durch Sprühen aufgebracht werden, 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. Of course, the piston can also be coated exclusively with the lubricating varnish. The phosphoric acid-containing solution used according to the invention can be applied by spraying, so that the amorphous phosphate layer can be generated inline. By doing so leaves avoid manual handling of the piston, and the risk of contamination of the surface of the piston is reduced. Furthermore, the inventive method can be integrated into the process for producing the piston without great expense.
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 The solution used in step (1) preferably contains a surfactant in addition to phosphoric acid (ortho-phosphoric acid). In this way, the wetting of the surface can be improved, so that a more uniform layer is formed. Further, the solution may contain other ingredients. Suitable nitrates, e.g. Sodium nitrate, manganese nitrate and
Zinknitrat, und/oder Sulfonate erwiesen. In einer bevorzugten Ausführungsform beträgt die Zinc nitrate, and / or sulfonates proved. In a preferred embodiment, the
Konzentration von Phosphorsäure in der Lösung 4% bis  Concentration of phosphoric acid in the solution 4% up
14% (g/g) , insbesondere 6% bis 12% (g/g) . Die Lösung hat bevorzugt einen pH-Wert von 1 bis 3. Für die Durchführung von Schritt (1) haben sich eine 14% (g / g), especially 6% to 12% (g / g). The solution preferably has a pH of from 1 to 3. For carrying out step (1), a
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.  Temperature of 30 ° C to 80 ° C, preferably 45 ° C to 65 ° C, and a treatment time of 50 seconds to 500 seconds, preferably 100 seconds to 400 seconds, proved to be particularly suitable.
Nach Beendigung des Schrittes (1) muss die Lösung, z.B. durch Spülen, von der Oberfläche des Kolbens entfernt werden. After completion of step (1), the solution, e.g. by rinsing, be removed from the surface of the flask.
Gegebenenfalls kann im Anschluss an Schritt (1) mittels eines optionalen Schrittes (2) ein Gleitlack aufgebracht werden. In diesem Fall wird Schritt (2) mit einem dem Fachmann bekannten Verfahren durchgeführt. Optionally, after application of step (1), an anti-friction coating can be applied by means of an optional step (2). In this case, step (2) is carried out by 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. Wie oben ausgeführt, führt die erfindungsgemäße Behandlung des Stahlkolbens zu einer besseren Haftung des Gleitlacks. On the piston obtained by means of the method according to the invention, a manganese phosphate layer can subsequently be formed in a further step (3). This process can be carried out in a manner known to those skilled in the art. As stated above, the treatment according to the invention of the steel piston leads to a better adhesion of the lubricating varnish.
Bei dem Gleitlack handelt es sich bevorzugt um einen The lubricating varnish is preferably one
Gleitlack, der eine Polymermatrix umfasst. Als Polymermatrix können die üblichen Ausgangsstoffe für Kolbenbeschichtungen, wie beispielsweise Phenolharze, Epoxidharze, Polyamid, Anti-friction varnish comprising a polymer matrix. As a polymer matrix, the usual starting materials for piston coatings, such as phenolic resins, epoxy resins, polyamide,
Polyamidimid und/oder PTFE eingesetzt werden, bevorzugt sind Phenolharze und/oder Epoxidharze. Polyamide-imide and / or PTFE are used, preferred are phenolic resins and / or epoxy resins.
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, then it is crosslinked after application. The crosslinking of the matrix can be effected thermally or by means of radiation, for example by UV or IR radiation.
Der Gleitlack umfasst weiterhin besonders bevorzugt The bonded coating further particularly preferred
funktionelle Bestandteile, beispielsweise einen oder mehrere Festschmierstoffe. Erfindungsgemäß werden als functional ingredients, for example one or more solid lubricants. According to the invention as
Festschmierstoff (e) bevorzugt Stoffe mit einer laminarartig kristallisierenden Struktur eingesetzt, wie beispielsweise Graphit, M0S2, WS2, -BN. Ferner können Polymere, wie z.B. PTFE eingesetzt werden. Solid lubricant (s) preferably substances with a laminar crystallizing structure used, such as graphite, M0S2, WS2, -BN. Furthermore, polymers such as e.g. PTFE can be used.
Geeignete Gleitlacke, deren Haftung mittels der Suitable bonded coatings whose adhesion by means of
erfindungsgemäßen amorphen Phosphat-Schicht verbessert werden kann, sind z.B. in der DE 10 2009 002 716 AI und 10 2009 002 715 AI beschrieben. amorphous phosphate layer according to the invention can be improved, are e.g. in DE 10 2009 002 716 AI and 10 2009 002 715 AI described.

Claims

Patentansprüche claims
Stahlkolben, insbesondere Stahlkolben für einen Steel pistons, especially steel pistons for one
Verbrennungsmotor, der zumindest in einem Bereich eine amorphe Phosphat-Schicht umfasst. Internal combustion engine comprising at least in one area an amorphous phosphate layer.
Stahlkolben gemäß Anspruch 1, wobei die amorphe Steel piston according to claim 1, wherein the amorphous
Phosphat-Schicht eine Dicke von 0,05 ym bis 5 ym, bevorzugt 0,1 ym bis 3 ym, hat Phosphate layer has a thickness of 0.05 ym to 5 ym, preferably 0.1 ym to 3 ym
Stahlkolben gemäß Anspruch 1 oder 2, wobei auf die amorphe Phosphat-Schicht ein Gleitlack—und/oder eine Manganphosphat-Schicht, bevorzugt ein Gleitlack, aufgebracht ist/sind. Steel piston according to claim 1 or 2, wherein on the amorphous phosphate layer, a lubricating varnish and / or a manganese phosphate layer, preferably a lubricating varnish is / are applied.
Stahlkolben gemäß Anspruch 1 bis 3, wobei die Steel piston according to claim 1 to 3, wherein the
Schicht (en) zumindest auf den Kolbenschaft und/oder die Bolzenbohrung, bevorzugt auf den gesamten Kolben, aufgebracht ist/sind. Layer (s) at least on the piston skirt and / or the pin bore, preferably on the entire piston, is applied / are.
Verfahren zur Herstellung eines Stahlkolbens gemäß einem der Ansprüche 1 bis 4 umfassend: A method of manufacturing a steel piston according to any one of claims 1 to 4, comprising:
(1) das Bilden einer amorphen Phosphat-Schicht durch(1) forming an amorphous phosphate layer
Behandlung mit einer Lösung, die Phosphorsäure enthält ; Treatment with a solution containing phosphoric acid;
(2) optional das Aufbringen eines Gleitlacks; und  (2) optionally, the application of a lubricating varnish; and
(3) optional das Bilden einer Manganphosphat-Schicht  (3) optionally forming a manganese phosphate layer
Verfahren gemäß Anspruch 5, wobei die in Schritt (1) eingesetzte Lösung ferner ein Tensid enthält. The method according to claim 5, wherein the solution used in step (1) further contains a surfactant.
Verfahren gemäß Anspruch 5 oder 6, wobei die A method according to claim 5 or 6, wherein the
Phosphorsäure Konzentration in der Lösung 4% bis 14% (g/g) beträgt. Phosphoric acid concentration in the solution is 4% to 14% (g / g).
8. Verfahren gemäß einem der Ansprüche 5 bis 7, wobei die in Schritt (1) eingesetzte Lösung einen pH-Wert von 1 bis 3 hat. 8. The method according to any one of claims 5 to 7, wherein the solution used in step (1) has a pH of 1 to 3.
9. Verfahren gemäß einem der Ansprüche 5 bis 8, wobei die Behandlung in Schritt (1) bei einer Temperatur von 30°C bis 80°C für 50 Sekunden bis 500 Sekunden durchgeführt wird . 9. The method according to any one of 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. Verwendung einer amorphen Phosphat-Schicht zur 10. Use of an amorphous phosphate layer for
Verbesserung der Haftung eines Gleitlacks auf einem Stahlkolben .  Improving the adhesion of a bonded coating on a steel piston.
11. Stahlkolben gemäß einem der Ansprüche 1 bis 4, 11. Steel piston according to one of claims 1 to 4,
erhältlich durch das Verfahren gemäß einem der Ansprüche 5 bis 9.  obtainable by the method according to one of claims 5 to 9.
EP18722516.4A 2017-05-05 2018-05-04 Steel piston having a phosphate layer Active EP3619416B1 (en)

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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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EP (1) EP3619416B1 (en)
CN (1) CN110892142B (en)
BR (1) BR112019023182A2 (en)
DE (1) DE102017207591A1 (en)
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RU2019139407A (en) 2021-06-07
CN110892142B (en) 2022-12-06
US20200102656A1 (en) 2020-04-02
BR112019023182A2 (en) 2020-05-19
RU2019139407A3 (en) 2021-10-06
EP3619416B1 (en) 2021-10-13
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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