EP1920088A1 - Verfahren zur herstellung eines verbundkörpers mit einer druckeigenspannungsbelasteten galvanischen beschichtung - Google Patents
Verfahren zur herstellung eines verbundkörpers mit einer druckeigenspannungsbelasteten galvanischen beschichtungInfo
- Publication number
- EP1920088A1 EP1920088A1 EP06791720A EP06791720A EP1920088A1 EP 1920088 A1 EP1920088 A1 EP 1920088A1 EP 06791720 A EP06791720 A EP 06791720A EP 06791720 A EP06791720 A EP 06791720A EP 1920088 A1 EP1920088 A1 EP 1920088A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- galvanic
- base body
- tool
- brittle
- 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
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
Definitions
- the invention relates to a method for producing a composite body with a pressure-resistant voltage-loaded galvanic coating.
- Typical applications are for example chrome-plated cylinder liners of diesel engines, chromed conveyor pipes for concrete mixtures, pump components that are corrosive stressed, or forming or deep drawing tools that are galvanically coated for the purpose of wear and adhesion protection, for example, with hard chrome.
- the invention is therefore based on the object to provide measures with which it is possible to produce galvanically coated components that contain in the coating no open to the surface, production-related cracks and at least in part of the coating high compressive stresses, the existing crack at least partially enclose.
- the Strength and corrosion resistance of electroplated components can be significantly improved.
- a composite body with a pressure-resistant, galvanically loaded, electroplated coating is produced by the combination of the following method steps:
- a composite-coated composite body having a base body and subjected to a galvanic coating process is provided.
- the coating process takes place in a manner known per se by electrodeposition, in which preferably a base body consisting of metallic material is completely or partially coated with a hard electroplated layer, preferably a hard chrome layer or nickel layer.
- the galvanic layer is surface-treated by a mechanical energy input directed onto the galvanic layer with treatment parameters adapted to the nature of the base body and the galvanic layer deposited thereon such that only local plastic deformations are introduced into the galvanic layer.
- the dependence of the Druckfieralia and brittle fracture limit of the applied on the base body galvanic layer of the tool geometry of those tools with which the galvanic layer is locally deformed determined, resulting in a required tool geometry, the required and maximum permissible force on the tool as well as the hardness of the tool area coming into contact with the galvanic layer to be treated are determined.
- a second step as part of a multiple ball pressure test, it is determined which number of repeated indentations per contact surface is permissible, without damaging the layer surface, but at the same time plastically deforming the layer surface. In this way, the allowable degree of coverage, ie the number of tool impressions per contact surface is determined.
- the preferred tool material is a material having at least the same hardness as the galvanic layer to be treated itself.
- a smooth as possible, rounded shape is selected for the contact area between the tool and the galvanic layer.
- the surface to be treated surface of the layer of brittle-hard coating material for example in the context of a shot peening process treated.
- the impacting on the galvanic layer spherical tool elements can be thrown in the context of a blasting system by compressed air or by means of a blower on the layer surface with adjustable kinetic impulse so that each point of the layer surface to be treated one or more times.
- the mechanical method is based in particular on the fact that the layer surface is locally plastically deformed with a suitable tool and in the layer compressive residual stresses are generated.
- Essential in the implementation of the mechanical surface treatment is that at the same time produced in the production of plastic surface deformations damage in the form of brittle fracture processes on the galvanic layer surface whose strength-reducing effect is greater than the strength-increasing effect caused by the "plasticization" compressive stresses.
- the above-mentioned requirement is achieved by limiting the plastic deformation to laterally narrowly limited layer surface areas and secondly by the fact that the tool with which the Layer surface of the workpiece to be treated comes into contact, having a certain contour in the region of the contact surface, which is generally considered to be not sharp-edged.
- the desired effect a deliberately introduced plastic deformation, can be achieved by a repeated, laterally offset local surface treatment , can be achieved surface covering.
- the tool has a suitable geometry, which is preferably round in shape and does not exceed a critical tool diameter dependent on the material of the galvanic layer to be processed.
- a suitable geometry which is preferably round in shape and does not exceed a critical tool diameter dependent on the material of the galvanic layer to be processed.
- a critical tool diameter dependent on the material of the galvanic layer to be processed.
- the critical diameter which is decisive for the dimensioning of the sphere, also defines the narrowly limited surface area within which the plastic deformation must take place on the layer surface.
- the kinetic momentum acting on the layer surface plays an important role.
- the geometry of the tool and the pulse setting, with which the tool strikes against the layer surface to be processed, are to be adjusted such that the desired plastic deformation takes place before the brittle fracture preferably not to take place, ie the height of the pulse input is to be such that the Extent of any occurring harmful brittle fracture is limited so much that the positive influence of plastic deformation on the strength of the galvanic layer outweighs.
- a hard chrome layer On a flat sample consisting of a metallic material, preferably steel, a hard chrome layer has been deposited with a layer thickness of 0.3 mm by means of a galvanic material deposition.
- Residual stress tests were performed on the sample to check for residual stresses within the hard chrome layer.
- the measurement results shown in the diagrams represent residual stress depths which have been measured transversely and along the sample or layer extension.
- FIG. 1 b shows the residual stress profile in a hard chrome layer which has been deposited in a comparable manner on the base body, according to the case situation in FIG. 1 a, but after a shot blasting treatment of the hard chrome layer.
- Evident are the favorable, extremely high residual compressive stresses of up to 2000 MPa in most of the layer.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005041078A DE102005041078B4 (de) | 2005-08-30 | 2005-08-30 | Verfahren zur Herstellung eines Verbundkörpers mit einer druckeigenspannungsbelasteten galvanischen Beschichtung |
PCT/EP2006/008458 WO2007025723A1 (de) | 2005-08-30 | 2006-08-29 | Verfahren zur herstellung eines verbundkörpers mit einer druckeigenspannungsbelasteten galvanischen beschichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1920088A1 true EP1920088A1 (de) | 2008-05-14 |
EP1920088B1 EP1920088B1 (de) | 2013-06-26 |
Family
ID=37478879
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06791720.3A Not-in-force EP1920088B1 (de) | 2005-08-30 | 2006-08-29 | Verfahren zur herstellung eines verbundkörpers mit einer druckeigenspannungsbelasteten galvanischen beschichtung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1920088B1 (de) |
DE (1) | DE102005041078B4 (de) |
WO (1) | WO2007025723A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3650586A1 (de) | 2018-11-09 | 2020-05-13 | FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V. | Verfahren zur herstellung galvanisch beschichteter bauteile und galvanisch beschichtetes bauteil |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB477295A (en) * | 1936-06-24 | 1937-12-24 | Wakefield & Co Ltd C C | Improvements in or relating to the coating of metal surfaces |
FR1461335A (fr) * | 1963-01-14 | 1966-02-25 | Loire Atel Forges | Procédé pour le traitement de surfaces de pièces métalliques permettant des fonctionnements sans lubrification |
GB1492503A (en) * | 1975-10-23 | 1977-11-23 | Kaman Sciences Corp | Chromium-plated articles |
JP2877013B2 (ja) * | 1994-05-25 | 1999-03-31 | 株式会社神戸製鋼所 | 耐摩耗性に優れた表面処理金属部材およびその製法 |
JPH0972288A (ja) * | 1995-09-05 | 1997-03-18 | Kobe Steel Ltd | 疲労強度に優れたスクロール部材及びスクロール型流体機械 |
EP1311712A2 (de) * | 2001-03-27 | 2003-05-21 | Widia GmbH | Verfahren zur erhöhung der druckspannung oder zur erniedrigung der zugeigenspannung einer schicht |
US6723177B2 (en) * | 2001-07-09 | 2004-04-20 | Southwest Research Institute | Life extension of chromium coating and chromium alloys |
-
2005
- 2005-08-30 DE DE102005041078A patent/DE102005041078B4/de not_active Expired - Fee Related
-
2006
- 2006-08-29 WO PCT/EP2006/008458 patent/WO2007025723A1/de active Application Filing
- 2006-08-29 EP EP06791720.3A patent/EP1920088B1/de not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2007025723A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3650586A1 (de) | 2018-11-09 | 2020-05-13 | FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V. | Verfahren zur herstellung galvanisch beschichteter bauteile und galvanisch beschichtetes bauteil |
DE102018219181A1 (de) | 2018-11-09 | 2020-05-14 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Verfahren zur Herstellung galvanisch beschichteter Bauteile und galvanisch beschichtetes Bauteil |
Also Published As
Publication number | Publication date |
---|---|
DE102005041078B4 (de) | 2007-05-24 |
DE102005041078A1 (de) | 2007-03-01 |
WO2007025723A1 (de) | 2007-03-08 |
EP1920088B1 (de) | 2013-06-26 |
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