EP2462260A1 - Verfahren zur herstellung strukturierter chromschichten - Google Patents
Verfahren zur herstellung strukturierter chromschichtenInfo
- Publication number
- EP2462260A1 EP2462260A1 EP10740123A EP10740123A EP2462260A1 EP 2462260 A1 EP2462260 A1 EP 2462260A1 EP 10740123 A EP10740123 A EP 10740123A EP 10740123 A EP10740123 A EP 10740123A EP 2462260 A1 EP2462260 A1 EP 2462260A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- chromium
- structural
- current density
- formation
- 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
Links
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/02—Heating or cooling
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/12—Process control or regulation
-
- 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
- C25D3/08—Deposition of black chromium, e.g. hexavalent chromium, CrVI
-
- 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
- C25D5/003—Electroplating using gases, e.g. pressure influence
-
- 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
- C25D5/02—Electroplating of selected surface areas
Definitions
- the invention relates to a method for producing structured chromium layers, in particular for media contact surfaces, wherein the structural chrome layer is produced by electrodeposition of chromium from an electrolyte onto a substrate.
- microstructured embossing dies are interesting or certain tribological properties of machine elements are required.
- chromium or hard chrome layers or structural chrome layers As structured chromium or hard chrome layers or structural chrome layers, a whole group of unspecified chromium-based surface coatings are referred to in technical usage, which are essentially characterized by an altered surface morphology associated with a typical surface roughness which is increased in comparison with gloss chrome.
- the individual structural elements forming the roughness are in most cases unspecified in terms of their shape and size, but are in many cases in the range of a few micrometers to 100 microns.
- the invention has for its object to provide a method for producing structured chromium layers with respect to the known chromium coatings improved surface properties.
- the object is achieved by a method having the features of the first claim or a surface of a printing machine element having the features of claim 10.
- the proposed galvanic deposition method for producing structured chromium layers for printing material contacting surfaces are spherical cap and undercut-free structural elements whose height above a ground plane is preferably equal to or smaller than their radius, created by the formation of the structural chromium layer at constant current densities and in one of the current density dependent temperature range and that the structure formation by at least one temperature change ini- is done.
- the pattern formation is performed in a threshold temperature range in which two of the metallic morphologies of metallic chromium coexist.
- the surface topography has only open wells (structure valleys) that are easily accessible for cleaning.
- the chrome layer has a high hardness and thus low wear.
- the inventive method is due to the wide range of possible shapes and distributions of structural elements at the same time high layer hardness for the production of functional layers suitable for a variety of applications. Examples of such applications are the generation of:
- microstructured surfaces for moving machine parts with improved tribological behavior reduced frictional resistance due to microturbulence
- Fig. 5 Illustration of the laboratory plant for galvanic deposition
- Fig. 6 formed according to Embodiment 1 structural chrome layer
- Fig. 7 formed according to Embodiment 2 structural chrome layer
- Fig. 8 formed according to Embodiment 3 structural chrome layer
- Fig. 9 formed according to exemplary embodiment 4 structural chrome layer
- FIG. 10 shows a structural chrome layer formed according to exemplary embodiment 5
- FIG. 11 shows a structural chrome layer formed according to exemplary embodiment 6
- FIG. 13 shows a structural chrome layer formed according to exemplary embodiment 8
- the method according to the invention is based on the following findings:
- a minimum current density is required, which corresponds to the minimum current density in conventional hard chrome deposition.
- the formation of the structure-forming elements takes place at a given current density in a very narrow temperature range and can be triggered by a targeted temperature change (disturbance).
- the size, distribution and shape of the structural elements can be controlled by a targeted temperature control.
- the existence regions for the two morphologies A, B are exemplary of a conventional hard chrome bath with known simple bath chemistry (self-regulating SRHS bath, 50-300 g / l CrO 3 ) in the current density temperature range between 30-45 ° C. and 15-130 A / dm 2 reproduced in Fig. 3.
- the coating devices were equipped with bath heating / cooling, Badum stiilzung, stirring, temperature-controlled cathode and power supply device.
- the concentration data (g / l) refer to CrO 3 .
- the formed chromium structures are closely related to the deposition temperature.
- the structuring takes place in a very narrow temperature window with respect to the surface temperature of the substrate at the phase boundary between the cathode and the electrolyte.
- the structure-forming process depends essentially on the fact that both morphologies A, B are formed in parallel within a very narrow temperature interval on both sides of the morphology boundary.
- this coexistence interval results in the formation of locally different growth fronts, which ultimately bring about the structuring of the surface according to the invention.
- the chromium structure according to the invention thus arises by embedding the faster growing morphology A in the slower growing morphology B.
- the respective desired chromium structure is brought about by deliberate adherence or one or more times exceeding or falling short of the temperature interval at the morphology boundary AB (limit temperature).
- the structure formation takes place in a narrow temperature range of 2-4 ° C (2-4 K) around a limit temperature which marks the coexistence range of the two morphologies A, B of the metallic chromium.
- the distribution and shape of the structural elements formed is controlled by the dwell time in the range of the limit temperature or time sequence of passing through the limit temperature range.
- Electrolyte SRHS bath 200 [g / l]
- Electrolyte SRHS bath 200 [g / l]
- Electrolyte SRHS bath 200 [g / l]
- Electrolyte SRHS bath 200 [g / l]
- Temperature profile Continuous change over 60 min from 39.5 to 42.5 0 C.
- Electrolyte SRHS bath 200 [g / l]
- Temperature profile Continuous change over 60 min from 39 to 40 ° C.
- Electrolyte SRHS bath 200 [g / l]
- Electrolyte SRHS bath 50 [g / l]
- Electrolyte Standard chromium bath, not self-regulating 250 [g / l] CrO3, 1% sulphate
- Temperature profile Continuously increasing from 38 to 45 ° C.
- a rough structure with rounded elevations (crests) is formed on a substrate, which have Kugelsegment- or Kugelabsacrificings- or Kugelkalottenform, which rise with a height h above a ground plane of the structural chromium layer, which is preferably smaller than its radius R or at most equal to the radius R is.
- the rounded structural elements have smooth crests or crests composed of smaller spherical caps.
- the structural elements are preferably arranged at a distance from each other without any gap formation or adjoin one another and have no substructures, pores or gaps tapering to the layer surface.
- the open layer structure therefore has excellent cleaning properties.
- the deposition of the structural chromium layers according to the invention from electroplating baths can be carried out with or without the addition of organic additives.
- the structural chromium layer is applied to the substrate directly or with at least one of the known functional intermediate layers (FIG. 4), depending on the substrate to be coated.
- the chromium structure may advantageously additionally conform to a smooth chrome layer, i. low constant layer thickness without leveling effect, be coated. Smooth chrome has a special hardness and thus wear resistance.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Automation & Control Theory (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT12282009A AT507785B1 (de) | 2009-08-04 | 2009-08-04 | Verfahren zur herstellung strukturierter chromschichten |
| PCT/AT2010/000277 WO2011014897A1 (de) | 2009-08-04 | 2010-07-28 | Verfahren zur herstellung strukturierter chromschichten |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP2462260A1 true EP2462260A1 (de) | 2012-06-13 |
| EP2462260B1 EP2462260B1 (de) | 2016-04-20 |
| EP2462260B8 EP2462260B8 (de) | 2016-06-22 |
Family
ID=42537240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10740123.4A Not-in-force EP2462260B8 (de) | 2009-08-04 | 2010-07-28 | Verfahren zur herstellung strukturierter chromschichten |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2462260B8 (de) |
| AT (1) | AT507785B1 (de) |
| WO (1) | WO2011014897A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014113000A1 (de) * | 2014-09-10 | 2016-03-10 | Rieter Ingolstadt Gmbh | Beschichtung für einen Drehteller |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1500971A (en) * | 1974-01-23 | 1978-02-15 | Vintage Curacao Nv | Electroplating process for chrome |
| GB1492702A (en) * | 1974-01-23 | 1977-11-23 | Vintage Curacao Nv | Electroplating process for chrome |
| US4804446A (en) * | 1986-09-19 | 1989-02-14 | The United States Of America As Represented By The Secretary Of Commerce | Electrodeposition of chromium from a trivalent electrolyte |
| DE4334122C2 (de) | 1992-04-09 | 1995-11-23 | Wmv Ag | Verfahren zum elektrochemischen Aufbringen einer Oberflächenbeschichtung und Anwendung des Verfahrens |
| DE4432512C2 (de) | 1994-09-13 | 1998-12-17 | Lpw Chemie Gmbh | Verwendung eines Verfahrens zur elektrolytischen Abscheidung von Chromschichten |
| DE19828545C1 (de) | 1998-06-26 | 1999-08-12 | Cromotec Oberflaechentechnik G | Galvanisches Bad, Verfahren zur Erzeugung strukturierter Hartchromschichten und Verwendung |
| DE19913273C2 (de) | 1999-03-24 | 2003-07-24 | Lpw Chemie Gmbh | Verfahren zum Herstellen von Perlchromschichten auf Werkstücken aus Metall, insbesondere Stahl |
| DE10255853A1 (de) | 2002-11-29 | 2004-06-17 | Federal-Mogul Burscheid Gmbh | Herstellung strukturierter Hartchromschichten |
| DE102004019370B3 (de) | 2004-04-21 | 2005-09-01 | Federal-Mogul Burscheid Gmbh | Herstellung einer strukturierten Hartchromschicht und Herstellung einer Beschichtung |
-
2009
- 2009-08-04 AT AT12282009A patent/AT507785B1/de not_active IP Right Cessation
-
2010
- 2010-07-28 WO PCT/AT2010/000277 patent/WO2011014897A1/de not_active Ceased
- 2010-07-28 EP EP10740123.4A patent/EP2462260B8/de not_active Not-in-force
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011014897A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2011014897A1 (de) | 2011-02-10 |
| AT507785B1 (de) | 2010-08-15 |
| EP2462260B8 (de) | 2016-06-22 |
| EP2462260B1 (de) | 2016-04-20 |
| AT507785A4 (de) | 2010-08-15 |
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