EP1570115A2 - Verfahren zur elektrolytischen abscheidung von magnesium oder magnesium-zink auf verzinktem blech - Google Patents
Verfahren zur elektrolytischen abscheidung von magnesium oder magnesium-zink auf verzinktem blechInfo
- Publication number
- EP1570115A2 EP1570115A2 EP03767590A EP03767590A EP1570115A2 EP 1570115 A2 EP1570115 A2 EP 1570115A2 EP 03767590 A EP03767590 A EP 03767590A EP 03767590 A EP03767590 A EP 03767590A EP 1570115 A2 EP1570115 A2 EP 1570115A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnesium
- zinc
- deposition
- layer
- solvent
- 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
- C25D5/10—Electroplating with more than one layer of the same or of different metals
-
- 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
- C25D5/48—After-treatment of electroplated surfaces
- C25D5/50—After-treatment of electroplated surfaces by heat-treatment
-
- 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
- C25D3/42—Electroplating: Baths therefor from solutions of light metals
Definitions
- the invention relates to a method for electrolytic magnesium deposition on a substrate made of sheet metal with a zinc or zinc alloy coating, in particular steel sheet.
- the galvanizing of body panels made of steel for the purpose of corrosion protection has largely become established in recent decades.
- the steel sheets galvanized using the hot-dip process or by means of electrolytic deposition are distinguished by good adhesion of the zinc layer to the steel sheet and good workability.
- JP 62109966 A describes a steel sheet, on the surface of which a zinc layer is first applied and then a magnesium layer, each by vapor deposition in a vacuum chamber. Due to the formation of an oxide layer on the magnesium surface, the sheet has very good corrosion properties. However, the vacuum process is problematic because it requires a very high level of equipment and process engineering. Furthermore, vacuum-coated sheets have a non-optimal adhesive strength of the magnesium layer.
- DE 195 27 515 Cl specifies a method for producing corrosion-protected steel sheet.
- a layer of one or more metals other than zinc or a zinc-free alloy is applied to a galvanized steel sheet by means of vacuum coating.
- the sheet metal coated in this way is then subjected to a heat treatment without exposure to an oxidizing atmosphere.
- a diffusion layer is formed on the surface of the double-coated steel sheet from the metal or alloy applied by vacuum coating and the zinc underneath. so Coated sheets are characterized by a good surface quality and high corrosion protection.
- the diffusion layer is sufficiently ductile relative to the thickness of the zinc coating to ensure that the steel sheet can continue to be formed well.
- the central disadvantage of this method is the high level of equipment and process technology associated with vacuum coating.
- DE 100 39 375 AI also describes a method for producing corrosion-protected steel sheet. This is similar to the process described in DE 195 27 515 Cl in that the magnesium is deposited from the vacuum phase on a galvanized or alloy-galvanized steel sheet to be subsequently heat-treated. In this case, however, the heat treatment is controlled so that there is a zinc-magnesium phase formation over the entire thickness of the zinc coating. This leads to a coating with the positive properties described above with a further improved corrosion protection. However, the disadvantages of vacuum coating mentioned above still exist.
- the microstructure of the coatings obtained is unfavorable, since the overall proportion of intermetallic phases in the coating is generally too high and the magnesium-containing phases are unfavorably distributed, since a targeted phase formation by means of heat treatment does not take place. This has a negative impact on both the corrosion resistance and the forming behavior of the coatings.
- EP 1 036 862 AI the electrolytic deposition of a Zn-Mg alloy layer on a metal sheet, consisting of iron, an iron alloy or of copper, aluminum or titanium or their alloys, is described in an aqueous acidic electrolyte, the one nonionic or cationic surfactant is added.
- the electrolytically deposited alloy layer draws are characterized by good formability and corrosion resistance according to the information in this document. The latter is further increased by the incorporation of carbon from the organic surfactant.
- a disadvantage of this process is its low current efficiency, since the charge transport in the electrolyte is largely carried out via protons and the formation of gaseous hydrogen in the course of the magnesium deposition cannot be prevented. This must be compensated for either by increasing the current density or the dwell time of the sheet to be coated in the electrolytic cell, which in both cases leads to a reduction in process efficiency.
- the object of the invention is to provide a process for the electrolytic magnesium coating of sheet metal with a zinc or zinc alloy coating, in particular steel sheet, which is characterized by low specific costs and wherein a sheet coated in accordance with the process should have a high surface quality and formability with simultaneously improved corrosion properties.
- the object is achieved by a method of the type mentioned in that
- the electrolytic deposition takes place in a solvent with a lower acidity than water, preferably in an essentially aprotic solvent, and
- the coated substrate is then subjected to a heat treatment to form a Mg-Zn alloy phase in the zinc layer.
- an aprotic solvent preferably tetrahydrofuran and / or diethyl ether
- a deposition process which is known to be efficient with respect to the current yield and which, in contrast to the methods of the prior art which are based on magnesium deposition in aqueous solution, with a comparatively low current density and / or Deposition time can take place.
- the particularly high cost-effectiveness of the method according to the invention in relation to the area-specific coating costs results from the simple implementation in terms of plant technology, in particular from the point of view of possible implementation in a continuous process.
- magnesium salts are suitable for transporting the magnesium ions from the solvent to the cathode as a result of the applied voltage, which dissolve either completely or only partially ionically in the abovementioned solvents.
- examples of such magnesium salts include the magnesium halides, magnesium grignard compounds, magnesium alcoholates or magnesium carboxylates.
- the electrolytically deposited magnesium layers have a significantly higher density and better adhesion than is the case with the usual vacuum coatings. This enables problem-free further processing in the subsequent heat treatment. In a continuous conveyor belt process, for example, problematic growth of the magnesium on the rolls, often the cause of surface defects on the finished product, can be avoided.
- the magnesium layer is preferably not exposed to an oxidizing atmosphere.
- the heat treatment can take place in a wide temperature range from 250 to 420 ° C, which results in different layer structures.
- the preferred layer structure results from the intended application. If the process is to be based on pure solid diffusion, treatment is preferably carried out at a temperature of 300 ° C. If the modification is to be controlled via the formation of a eutectic, a temperature of 380 ° C. is preferred.
- the treatment time for a zinc coating of 7.5 ⁇ m customary in the automobile is a maximum of 60 s, preferably 6 s in the case of solid-state diffusion or 2 s in the case of the formation of a eutectic.
- the formation of the alloy phase improves the corrosion properties to such an extent that sheet metal with a reduced thickness of the zinc coating can be used for the process according to the invention. This, in turn, results in an improved formability of the sheet with sufficient or even improved corrosion resistance. Accordingly, the specific advantages of a zinc and a magnesium coating are optimally combined in the method according to the invention.
- a sheet coated according to the invention thus combines the properties of conventionally galvanized sheets with the extreme corrosion resistance of one
- Zinc alloy coating can be expanded by simultaneously electrolytically depositing zinc in metallic form in addition to magnesium.
- the magnesium layer is deposited in a mass ratio of 0.1 to 10 mass%, preferably 1 to 2 mass%, to the zinc layer present on the galvanized sheet surface, which is one with regard to the material used enables economical execution of the method according to the invention.
- concentration of the magnesium ions or the magnesium-containing molecular ions in the electrolyte is kept essentially constant. In terms of process engineering, this can be done in two ways. On the one hand, it is possible to introduce the magnesium ions into the aprotic solvent by means of a magnesium anode that gradually dissolves. On the other hand, a constant ion concentration can also be achieved in that the magnesium ions are introduced into the aprotic solvent by the essentially continuous addition of a magnesium-containing substance using an inert anode.
- electrolytically galvanized sheet metal offers the advantage that the galvanizing and the magnesium deposition and heat treatment of the coated sheet according to the invention can be carried out directly in succession in one system, since the electrolytic cells used for the galvanizing on the one hand and for the subsequent magnesium coating on the other hand essentially can be constructed identically.
- This advantage can be used in particular if the galvanized sheet is coated as a continuous material in a continuous process. In this case, the band-shaped material first passes through several cells for applying the zinc layer and then through a last cell for magnesium deposition. The expansion of a conventional coil coating system for the execution of the The inventive method is therefore possible with very little effort.
- a substrate in the form of a steel strip 1 is first passed in a transport direction T over a roller guide 1 a through three successively arranged, identically constructed electrolysis cells 2 and thereby provided with a zinc layer with a total thickness of, for example, approximately 7.5 ⁇ m.
- the steel strip 1 thus functions as a cathode in the electrolysis process.
- the electrolytic cells 2 are each filled with an aqueous electrolyte 2a, in each of which two anodes 2b consisting of elemental zinc are immersed, which continuously release zinc ions into the electrolyte 2a during the coating process.
- the steel strip 1 then passes through a last electrolysis cell 3 which is filled with an electrolyte 3a based on an aprotic solvent, for example a mixture of tetrahydrofuran and diethyl ether.
- an aprotic solvent for example a mixture of tetrahydrofuran and diethyl ether.
- Two anodes 3b made of elemental magnesium are immersed in the electrolytes 3a in a manner comparable to the electrolytic cells 2, which anodes in turn continuously release magnesium ions into the electrolytes 3a in the course of the coating.
- the galvanized steel strip 1 is provided with a magnesium layer with a thickness of, for example, approx. 0.5 ⁇ m.
- the strip 1 is fed directly to a heating device 4, which is arranged in a housing 5 filled with inert gas 5a, such as argon or nitrogen.
- a belt running concept with further roller contacts between the electrolytic cell 3 and the heating device 4 is easily possible here, since the electrolytically deposited Mg layers have good adhesion to the substrate, so that there is no growth of magnesium on the rollers due to abrasion.
- the strip section passing through is heat-treated at a temperature of, for example, 300 ° C. and a treatment time of e.g. 6s, so that an Mg-Zn alloy layer is formed on the surface of the coated steel strip 1 by diffusion. It goes without saying that the length of the route on which the heat treatment is carried out and the transport speed of the belt 1 must be coordinated with one another in order to maintain the desired treatment time.
- the coated and heat-treated steel strip 1 which now has a shiny metallic, highly corrosion-resistant surface, can be subjected to further processing steps or wound up into a coil.
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)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Electrolytic Production Of Metals (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10257737 | 2002-12-10 | ||
DE10257737A DE10257737B3 (de) | 2002-12-10 | 2002-12-10 | Verfahren zur elektrolytischen Magnesium-Abscheidung auf verzinktem Blech |
PCT/EP2003/013055 WO2004053203A2 (de) | 2002-12-10 | 2003-11-21 | Verfahren zur elektrolytischen abscheidung von magnesium oder magnesium-zink auf verzinktem blech |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1570115A2 true EP1570115A2 (de) | 2005-09-07 |
EP1570115B1 EP1570115B1 (de) | 2006-04-12 |
Family
ID=30775622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03767590A Revoked EP1570115B1 (de) | 2002-12-10 | 2003-11-21 | Verfahren zur elektrolytischen abscheidung von magnesium oder magnesium-zink auf verzinktem blech |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1570115B1 (de) |
AT (1) | ATE323186T1 (de) |
AU (1) | AU2003292060A1 (de) |
DE (2) | DE10257737B3 (de) |
ES (1) | ES2261976T3 (de) |
PL (1) | PL375788A1 (de) |
WO (1) | WO2004053203A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9744743B2 (en) | 2012-12-26 | 2017-08-29 | Posco | Zn—Mg alloy plated steel sheet, and method for manufacturing same |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PL1651789T3 (pl) * | 2003-07-29 | 2011-03-31 | Voestalpine Stahl Gmbh | Sposób wytwarzania hartowanych elementów konstrukcyjnych z blachy stalowej |
EP1624093A1 (de) * | 2004-08-04 | 2006-02-08 | Aluminal Oberflächentechnik GmbH & Co. KG | Beschichten von Substraten aus Leichtmetallen oder Leichtmetalllegierungen |
DE102004037673B4 (de) * | 2004-08-04 | 2009-01-29 | Thyssenkrupp Steel Ag | Verfahren zur simultanen elektrolytischen Abscheidung von Zink und Magnesium auf einem Substrat aus Blech und Verfahren zur Herstellung eines korrosionsgeschützten lackierten Formteils aus Blech |
DE102005036426B4 (de) * | 2005-08-03 | 2007-08-16 | Thyssenkrupp Steel Ag | Verfahren zum Beschichten von Stahlprodukten |
DE102008004728A1 (de) | 2008-01-16 | 2009-07-23 | Henkel Ag & Co. Kgaa | Phosphatiertes Stahlblech sowie Verfahren zur Herstellung eines solchen Blechs |
DE102009022515B4 (de) * | 2009-05-25 | 2015-07-02 | Thyssenkrupp Steel Europe Ag | Verfahren zum Herstellen eines Stahlflachprodukts und Stahlflachprodukt |
DE102021200229A1 (de) | 2021-01-13 | 2022-07-14 | Thyssenkrupp Steel Europe Ag | Verfahren zur Herstellung eines elektrolytisch beschichteten Stahlblechs |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3520780A (en) * | 1967-05-11 | 1970-07-14 | Xerox Corp | Magnesium electrodeposition |
US3505043A (en) * | 1969-01-08 | 1970-04-07 | Inland Steel Co | Al-mg-zn alloy coated ferrous metal sheet |
JPS62109966A (ja) * | 1985-11-08 | 1987-05-21 | Nippon Kokan Kk <Nkk> | 耐食性めつき鋼板 |
DD243722A1 (de) * | 1985-11-15 | 1987-03-11 | Tech Hochschule C Schorlemmer | Galvanisches bad und verfahren zum abscheiden von magnesiumueberzuegen |
DE19527515C1 (de) * | 1995-07-27 | 1996-11-28 | Fraunhofer Ges Forschung | Verfahren zur Herstellung von korrosionsgeschütztem Stahlblech |
DE69730212T2 (de) * | 1996-12-13 | 2005-08-18 | Nisshin Steel Co., Ltd. | HEISSTAUCH Zn-Al-Mg BESCHICHTETES STAHLBLECH MIT HERVORRAGENDEN KORROSIONSEIGENSCHAFTEN UND OBERFLÄCHENAUSSEHEN UND VERFAHREN ZUR HERSTELLUNG |
DE19855666A1 (de) * | 1998-12-01 | 2000-06-08 | Studiengesellschaft Kohle Mbh | Aluminiumorganische Elektrolyte und Verfahren zur elektrolytischen Beschichtung mit Aluminium oder Aluminium-Magnesium Legierungen |
US6607844B1 (en) * | 1999-03-15 | 2003-08-19 | Kobe Steel, Ltd. | Zn-Mg electroplated metal sheet and fabrication process therefor |
DE10039375A1 (de) * | 2000-08-11 | 2002-03-28 | Fraunhofer Ges Forschung | Korrosionsgeschütztes Stahlblech und Verfahren zu seiner Herstellung |
KR100590406B1 (ko) * | 2001-12-22 | 2006-06-15 | 주식회사 포스코 | 내식성 및 용접성이 우수한 표면처리강판 및 그 제조방법 |
-
2002
- 2002-12-10 DE DE10257737A patent/DE10257737B3/de not_active Withdrawn - After Issue
-
2003
- 2003-11-21 EP EP03767590A patent/EP1570115B1/de not_active Revoked
- 2003-11-21 PL PL03375788A patent/PL375788A1/xx not_active Application Discontinuation
- 2003-11-21 AU AU2003292060A patent/AU2003292060A1/en not_active Abandoned
- 2003-11-21 WO PCT/EP2003/013055 patent/WO2004053203A2/de not_active Application Discontinuation
- 2003-11-21 ES ES03767590T patent/ES2261976T3/es not_active Expired - Lifetime
- 2003-11-21 DE DE50302990T patent/DE50302990D1/de not_active Expired - Fee Related
- 2003-11-21 AT AT03767590T patent/ATE323186T1/de active
Non-Patent Citations (1)
Title |
---|
See references of WO2004053203A2 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9744743B2 (en) | 2012-12-26 | 2017-08-29 | Posco | Zn—Mg alloy plated steel sheet, and method for manufacturing same |
Also Published As
Publication number | Publication date |
---|---|
AU2003292060A8 (en) | 2004-06-30 |
WO2004053203A3 (de) | 2004-12-23 |
DE10257737B3 (de) | 2004-02-26 |
ATE323186T1 (de) | 2006-04-15 |
PL375788A1 (en) | 2005-12-12 |
WO2004053203A2 (de) | 2004-06-24 |
ES2261976T3 (es) | 2006-11-16 |
EP1570115B1 (de) | 2006-04-12 |
DE50302990D1 (de) | 2006-05-24 |
AU2003292060A1 (en) | 2004-06-30 |
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