CN102337538A - Wearing protection system provided with gradual hardness distribution - Google Patents

Wearing protection system provided with gradual hardness distribution Download PDF

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Publication number
CN102337538A
CN102337538A CN2011102017450A CN201110201745A CN102337538A CN 102337538 A CN102337538 A CN 102337538A CN 2011102017450 A CN2011102017450 A CN 2011102017450A CN 201110201745 A CN201110201745 A CN 201110201745A CN 102337538 A CN102337538 A CN 102337538A
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layer
hard chrome
deposition
chrome coating
coating
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CN102337538B (en
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H.毛斯
A.黑巴赫
M.林纳
S.希普庆
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C23C28/343—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one DLC or an amorphous carbon based layer, the layer being doped or not
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/18—Electroplating using modulated, pulsed or reversing current
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/605—Surface topography of the layers, e.g. rough, dendritic or nodular layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/605—Surface topography of the layers, e.g. rough, dendritic or nodular layers
    • C25D5/611—Smooth layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/625—Discontinuous layers, e.g. microcracked layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/04—Electroplating: Baths therefor from solutions of chromium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physical Vapour Deposition (AREA)
  • Chemical Vapour Deposition (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

The invention relates to a wearing protection system provided with gradual hardness distribution. The invention relates to a method used for manufacturing a layer system provided with enhanced unlubricated operation properties. The layer system in the invention is provided with at least an electrodepositing layer of hard chrome and a diamond like carbon (DLC) layer applied on the electrodeposited hard chromium layer. The invention also relates to a layer system manufactured according to the invention and uses of the layer system for a coating layer of a valve component, and particularly a gas valve component.

Description

Abrasion protection system with Hardness Distribution gradually
Technical field
This discovery relates to a kind of method that is used to make the layer system of the dried service performance with improvement.Layer system of the present invention has hard chrome coating and DLC layer (Diamond like carbon, similar adamantine charcoal) that is coated on this layer of at least one electroplating deposition.The invention still further relates to and a kind ofly be used for valve member, the especially purposes of the coating of gas valve member according to the layer system of the inventive method manufacturing with this layer system.
Background technology
In machinofacture, device fabrication and instrument were made, wear-resistant layer was used for receiving on the prolonged mechanical life of components of high loading.For example for a long time, chemically nickel dam or hard chrome coating are used as the abrasion protection in these fields with great success.With plating method these layers are coated on member, substrate and the base mateiral that will protect.
In order to prolong the life-span of member, substrate or base mateiral by wear-resistant layer; Attempt on the one hand reducing stress at this, and the material abrasion under given in advance load are minimized through the alap frictional coefficient of this resist.The task of wear-resistant layer especially should reduce the abrasion of base mateiral, and therefore resist base mateiral continue, the especially distortion of abrasiveness.In addition, wear-resistant layer can provide a kind of friction pair (Reibpaarung) that is suitable for relative object, and can prevent for example to invade in the base mateiral of member from the grit in the contaminated fuel, and therefore prevents the for example destruction of trim.
With the organic layer of for example anti-friction lacquer on the contrary; Galvanized wear-resistant layer is fulfiled its task at the whole life-span duration of member, wherein said organic layer the unloading phase abrasion and realized the perfect isostatic on surface that is also referred to as the wearing and tearing body of these members between member.At this, galvanized wear-resistant layer has one or more material behaviors of sedimentary metal respectively.So far only conditionally, just be used for the metal of this layer and, can these characteristics and the specific summary that requires be complementary through selecting through change layer thickness or mode of deposition.
Under the situation of the big difference in hardness of the base mateiral that will protect and wear-resistant layer, possibly cause so-called eggshell effect.In the case, hard wear-resistant layer collapses in the base mateiral under load, because in base mateiral, there is not the basic hardness that is enough to the supporting abrasion resist.
Except individual layer was coated on the base mateiral routinely with wear-resistant layer, the new development that is used to optimize the characteristic of wear-resistant layer was provided with so-called multilayer system.In the case, follow two kinds of different schemes in principle.Can be arranged alternately on the one hand soft and hard layer, and in the wear-resistant layer structure, the successive changes in hardness is set on the other hand.The latter is also referred to as with different levels abrasion protection layer system.
For example through plating method, for example substrate or the member through will coating is transformed in the different electrolytic baths, can generate the sequence of the wear-resistant layer that is made up of differing materials.If in the resist sequence of layer, material different is used for each layer, in this challenge the mixture of making a kind of firm attachment.The method that another kind is used to construct multilayer system is, the material of wearing layer is coated on the base mateiral under the mode of deposition of alternation.Therefore can for example chromium be deposited as hard chrome on the one hand through applying volts DS, wherein flawless chromium be deposited on the sedimentary hard chrome coating of institute through applying pulsed current as deposition current.
Also known for example through physical vapor deposition (PVD) or for example the close method of chemical vapor deposition (CVD) generate resist.Can be with the PVD method with nearly all metal of very pure form deposition and charcoal even.Yet only can be created on the thin layer of several nanometers in several micrometer ranges economically.In addition, these methods are that cost is very expensive.
For the member that receives high loading, usually realize abrasion protection with hard chrome coating or similar adamantine charcoal layer (DLC).But in most of the cases condition is, the basis be sufficiently rigid with can bear load so that avoid wear-resistant layer to be pressed in the base mateiral and occur above-mentioned eggshell effect thus.Therefore usually adopt the suitable hard base mateiral as the hardened steel, for example 100Cr6.
Summary of the invention
Utilization the invention provides a kind of method that is used on substrate surface, depositing the layer system of the dried service performance with improvement, and this method has following method steps at least:
-deposition current electroplating deposition hard chrome coating on substrate surface through applying pulse;
-by PVD or CVD the DLC layer is coated on the hard chrome coating of electroplating deposition.
Through form by hard chrome coating and DLC layer according to combination of the present invention, in a layer system, united the advantageous feature of two layers.The characteristics of sedimentary layer system like this are their hardness and their outstanding dried service performance.
Sedimentary hard chrome coating both can be an individual layer in first method steps according to the present invention, can be again multilayer system.Following multilayer system is specially suitable: this multilayer system is formed by the sedimentary hard chrome coating in tiny crack ground with through applying the combination that the sedimentary flawless chromium layer of pulsed current constitutes above that.
Advantage below the inventive method provides, the pre-treatment that promptly needn't make the substrate of wanting coating stand to take a lot of trouble, like this usually on the substrate during deposition DLC layer necessity.Therefore so far need be in bothersome and the expensive grinding step of cost be ready to be equipped with the substrate surface of DLC layer for coating subsequently.Can avoid the pre-treatment of this reinforcement of substrate surface through the inventive method, but this optimizes the cost of each workpiece thus.
Before applying the DLC layer; Through electroplating deposition hard chrome coating according to the present invention; Produce additional advantage, promptly through electroplated coating process itself, removed any organic residue of grease for example or analogue and fine particle even from substrate surface; Make on the only rough prewashed substrate after the electroplated coating process, the mode of the best of very cleaning and exsiccant substrate prepared with to(for) the subsequent coating of DLC layer are provided.Therefore can cancel the cleaning section before the DLC coating, produce further advantage economically thus.
In addition, the hard chrome coating of electroplating deposition does not propose special requirement for the surface quality of the substrate of wanting coating.But said hard chrome coating is described the surface tissue of substrate usually, and the roughness of hard chrome coating is relevant with the character of substrate surface thus.But here can be in an advantageous manner; Reach smooth effect through the deposit multilayer system; Make and the substrate surface of the roughness that after the electroplating deposition of hard chrome coating finishes, obtained to have optimization in the methods of the invention can the DLC layer be coated on this substrate surface subsequently with the mode of giving prominence to.
But especially based on agglomerated material or spray to cast metal (Metal Injection Molding (spray to cast metal); MIM) new raw material; Usually the conventional material of ratio such as steel is more cheap, and in addition processing more easily, but enough abrasion protections often are not provided.Because the morphology of the inhomogeneity in its surface that on this material, occurs, this raw material can not or just be difficult to the suitable wear-resistant layer of equipment so far.Through method of the present invention, can use these new raw materials of multilayer wear-resistant layer equipment.This has opened in big industry is made the advantage of the manufacturing technology of these novel materials and the combined possibility of wearing character of giving prominence to of DLC layer.
Through method of the present invention and layer system of the present invention, can compensate the feasible small distortion that only causes base mateiral through the impact energy that affacts on substrate or the substrate surface such as ballistic mechanical load by hard chrome coating.Therefore avoided peeling off by caused eggshell effect of this distortion and coated the caused thus of DLC layer.Wearing layer and therefore remarkable higher life-span of substrate even itself have been reached thus.
In a kind of expansion scheme of the inventive method, deposition have between 0.5 μ m and the 300 μ m, preferably between 1 μ m and the 200 μ m, the hard chrome coating of the layer thickness between 3 μ m and 50 μ m more preferably.This layer thickness is suitable for, and for the DLC layer that applies above that mechanically sufficiently stable basis is provided, so that under the effect of common mechanical load, avoid peeling off of DLC layer.
In another expansion scheme of the inventive method, for the electroplating deposition hard chrome coating, adjustment has at 10A/dm 2And 100A/dm 2Between, preferably at 20A/dm 2And 80A/dm 2Between, more preferably at 25A/dm 2And 60A/dm 2Between the deposition current of average current density.
According to another expansion scheme of the inventive method,, preferably be adjusted at the pulse-repetition of the deposition current between 0.1Hz and the 1000Hz in order to be used for the electroplating deposition hard chrome coating.
Can stipulate according to the present invention; Therefore adjust current pulse sequence and adjustment is along with transformable electric current of time by opertaing device, said current pulse sequence has anode on substrate with the cathodic current pulse and have in case of necessity the therebetween static intermittence with zero volt or more intermittant voltages that lie prostrate more.
Alternatively or additionally, can adjust sequence of voltage pulses by opertaing device, and therefore electromotive force stably along with the time can be adjusted voltage with changing.The pulse curve of current stabilization of the present invention can be exemplarily by the appropriate pretreatment of improving the adhesion strength of coating with the waiting time of 0s to 240s, base mateiral through 10 to 30s activationary times with again with the activation of 0s to 20s waiting time and alternately by having 1ms to 10s pw and having 10 respectively to 100A/dm 2The actual pulse sequence that the pulse of current density and back pulse are formed is formed, and wherein can select similar parameter for back pulse.Can in chromium layer deposition, change these parameters, so that reach with different levels characteristic.
In a kind of expansion scheme of the inventive method, for the electroplating deposition hard chrome coating, be adjusted between 1:1 and the 1:10, the preferred ratio of the density of the negative current between 1:2 and 1:5/positive current density.This means that in this expansion scheme of present method, back pulse has the length between 1/10 to 1/1 of deposition pulse.
Advantageously can be reach the adjustment of chromium layer characteristic through only control current process parameter and/or voltage course parameter according to the present invention.At this, can be separately through have or do not change the polar electric current/or voltage control deposit each chromium layer with desirable different qualities.In the case, can deposit the chromium layer that has different structure pointedly.In this way can be on the substrate of processing by quite soft base mateiral, for example at first generate by having>=layer that 450HV processes to the flawless soft chromium of>=700HV hardness, and then generations>=700HV extremely≤increase of 1100HV the chromium layer of hardness.
In a kind of preferred expansion scheme of the present invention, the DLC layer that is deposited on the hard chrome coating according to the present invention can have the layer thickness between 1 μ m and 10 μ m.This layer thickness provides outstanding abrasion protection, and good dried service performance above that is shown.Especially valve member, the especially application of the inventive method of the coating of gas valve member are favourable for for example being used for for this, because under the condition that lacks such as oil or greasy low friction compound, also guaranteed the high-effect of valve or valve member.
According to the present invention; Can by be used for the DLC coating from method well known in the prior art; Such as chemical vapour deposition (Chemical Vapor Deposition; CVD), (Plasma Vapor Deposition (plasma gas phase deposition), PVD) or similarly method is coated to the DLC layer on the hard chrome coating of electroplating deposition physical vapor deposition.
In addition, utilize the present invention that a kind of layer system has been described, this layer system have electroplating deposition first hard chrome coating on the substrate surface be coated in the DLC layer on first hard chrome coating, wherein hard chrome coating has the layer thickness between 0.5 μ m and 300 μ m.
Layer system of the present invention as at for example steel or the wear-resistant layer on the different base mateirals of agglomerated material even, demonstrates the favorable durability of outstanding dried service performance and antagonism mechanical load.Especially, layer system of the present invention also demonstrates coated DLC layer and does not peel off or very small peeling off only arranged under common mechanical load.
In the case, in a kind of expansion scheme of layer system, hard chrome coating can have＞700HV, preferably>=750HV and≤hardness between the 1100HV.
In layer system of the present invention, the DLC layer can have the layer thickness between 1 μ m and 10 μ m.
Description of drawings
Below combine accompanying drawing and be not limited to this place to set forth the present invention by embodiment.At this, indicate identical parts with identical Reference numeral.
Fig. 1 illustrates the constructed profile that has according to the substrate of the chromium resist of prior art.
Fig. 2 illustrates the constructed profile of the substrate with the wear-resistant layer that applies according to the present invention.
Fig. 3 illustrate have according to the present invention apply, with the constructed profile of the substrate of the wear-resistant layer of multilayer hard chrome coating.
Embodiment
Fig. 1 illustrates a kind of by wear-resistant layer prior art, that be made up of the hard chrome coating (2) that is deposited on the substrate surface (1).The hard chrome coating of electroplating deposition (2) has favorable mechanical stability.But the dried service performance of this hard chrome coating (2) is not best, to such an extent as to can only this layer be used in the scope like lower member conditionally: said member has the running done at the same time, is exposed to corresponding mechanical load when just lacking low friction compound dangerous.
Fig. 2 illustrates a kind of according to the sedimentary layer system of the inventive method (3,4).The electrolytic deposition for hard chrome coating be common pre-treatment (such as the degrease step) afterwards, the deposition current through applying pulse is deposited on hard chrome coating (3) for example on the surface (1) of substrate of the valve member that is made up of steel or agglomerated material.At this, can relevantly change pw with substrate or desirable layer characteristic with mode known in the prior art.Therefore can be at 30A/dm 2The situation of average current density under for example adjust that the pulse-repetition of 20Hz is used for deposition.The hardness of average layer thickness that sedimentary layer like this demonstrates 50 μ m and＞900HV.Optionally the flushing and drying step after, by CVD the DLC layer is coated on the hard chrome coating (3) of acquisition like this.Substrate that for this reason will coating takes off from the support that is used to electroplating deposition, and is transferred to and is applicable in the sedimentary Goods bearer of CVD.This preferred robotization ground, for example undertaken by suitable industrial robot.So utilize transfer substrates that Goods bearer will use hard chrome coating (3) coating in corresponding C VD equipment, in this CVD equipment, apply the DLC layer (4) of average layer thickness with 3 μ m.The layer system (3,4) that so obtains demonstrates and prevents abrasive high-durability of abrasiveness and good notch shock weather resistance.In addition, layer system (3,4) demonstrates good dried service performance.
Fig. 3 illustrates a kind of according to the sedimentary layer system of the inventive method.The electrolytic deposition for hard chrome coating be common pre-treatment (such as the degrease step) afterwards, the first chromium layer (5) for example is deposited on the surface (1) of substrate of the valve member that constitutes by steel or agglomerated material.Has 20A/dm through applying 2The galvanic current of average current density, chromium layer (5) is deposited the layer thickness until 30 μ m.The chromium layer that so obtains demonstrates the hardness of 500HV.Need not substrate be transformed in the other electrolytic solution,, hard chrome coating (3) be deposited on the sedimentary chromium layer like this now through applying the deposition current of pulse.At this, can relevantly change pw with substrate or desirable hard chrome characteristic with mode known in the prior art.Therefore can be at 70A/dm 2The situation of average current density under for example adjust that the pulse-repetition of 60Hz is used for deposition.The hardness of average layer thickness that sedimentary layer like this (3) demonstrates 70 μ m and＞900HV.Optionally the flushing and drying step after, by CVD the DLC layer is coated on the hard chrome coating (3) of acquisition like this.Substrate that for this reason will coating takes off from the support that is used to electroplating deposition, and is transferred to and is applicable in the sedimentary Goods bearer of CVD.This preferred robotization ground, for example undertaken by suitable industrial robot.So utilize transfer substrates that Goods bearer will use hard chrome coating (3) coating in corresponding C VD equipment, in this CVD equipment, apply the DLC layer (4) of average layer thickness with 3 μ m.The layer system (3,4) that so obtains demonstrates and prevents abrasive high-durability of abrasiveness and good notch shock weather resistance.In addition, layer system (3,4) demonstrates good dried service performance.

Claims (10)

1. one kind is used on substrate surface the method for layer system that deposition has the dried service performance of improvement, has following method steps at least:
-go up electroplating deposition hard chrome coating (3,5) through the deposition current that applies pulse at substrate surface (1);
-by PVD or CVD DLC layer (4) is coated on the hard chrome coating of electroplating deposition.
2. according to the process of claim 1 wherein that deposition has the hard chrome coating (3,5) of the layer thickness between 0.5 μ m and 300 μ m.
3. according to the method for one of above claim, wherein for the said hard chrome coating of electroplating deposition (3,5), adjustment has at 10A/dm 2And 100A/dm 2Between the deposition current of average current density.
4. according to the method for one of above claim,, be adjusted at the pulse-repetition of the deposition current between 0.1Hz and the 1000Hz wherein for the said hard chrome coating of electroplating deposition (3).
5. according to the method for one of above claim,, be adjusted at the ratio of the negative current density/positive current density between 1:1 and 1:10, preferred 1:2 and the 1:5 wherein for the said hard chrome coating of electroplating deposition (3).
6. according to the method for one of above claim, settled layer system on the metallic surface wherein.
7. layer system; Has electroplating deposition at first hard chrome coating (3,5) on the substrate surface (1) be coated in the DLC layer (4) on said first hard chrome coating (3,5); Wherein said hard chrome coating (3,5) has the layer thickness between 0.5 μ m and 300 μ m.
8. according to the layer system of claim 7, wherein said hard chrome coating (3) has＞700HV, preferably>=750HV and≤hardness between the 1100HV.
9. according to the layer system of claim 4, wherein said DLC layer (4) has the layer thickness between 1 μ m and 10 μ m.
10. the layer system according to one of claim 7 to 9 is used for valve member, the especially purposes of the coating of gas valve member.
CN201110201745.0A 2010-07-20 2011-07-19 There is the abrasion protection system of Hardness Distribution gradually Expired - Fee Related CN102337538B (en)

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DE102010031539.7 2010-07-20
DE102010031539A DE102010031539A1 (en) 2010-07-20 2010-07-20 Depositing a layer system with enhanced unlubricated operation properties on a substrate surface, useful for coating gas valve components, comprises e.g. electrodepositing a layer of hard chrome on a substrate surface

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DE102013009328A1 (en) 2013-06-03 2014-12-04 Technische Universität Bergakademie Freiberg Method for the combined surface treatment of components made of lightweight materials
DE102017205028A1 (en) 2017-03-24 2018-09-27 Robert Bosch Gmbh Wear-resistant coated metallic component consisting of this component assembly

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