EP1969162B1 - Verfahren zur vorbehandlung von titanbauteilen zur nachfolgenden beschichtung derselben - Google Patents

Verfahren zur vorbehandlung von titanbauteilen zur nachfolgenden beschichtung derselben Download PDF

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Publication number
EP1969162B1
EP1969162B1 EP06818072.8A EP06818072A EP1969162B1 EP 1969162 B1 EP1969162 B1 EP 1969162B1 EP 06818072 A EP06818072 A EP 06818072A EP 1969162 B1 EP1969162 B1 EP 1969162B1
Authority
EP
European Patent Office
Prior art keywords
nickel
component
acid
solution
titanium
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.)
Not-in-force
Application number
EP06818072.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1969162A2 (de
Inventor
Helena Catalan-Asenjo
Michael Scheid
Josef Linska
Matthias Schmidt
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.)
MTU Aero Engines AG
Original Assignee
MTU Aero Engines 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 MTU Aero Engines GmbH filed Critical MTU Aero Engines GmbH
Priority to PL06818072T priority Critical patent/PL1969162T3/pl
Publication of EP1969162A2 publication Critical patent/EP1969162A2/de
Application granted granted Critical
Publication of EP1969162B1 publication Critical patent/EP1969162B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00Etching metallic material by chemical means
    • C23F1/10Etching compositions
    • C23F1/14Aqueous compositions
    • C23F1/16Acidic compositions
    • C23F1/26Acidic compositions for etching refractory metals
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23GCLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/10Other heavy metals
    • C23G1/106Other heavy metals refractory metals
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34Pretreatment of metallic surfaces to be electroplated
    • C25D5/38Pretreatment of metallic surfaces to be electroplated of refractory metals or nickel

Definitions

  • the invention relates to a method for the pretreatment of titanium components for the subsequent coating thereof.
  • Titanium materials have high strength with low density, good corrosion resistance and heat resistance. Especially in the aerospace industry and aircraft engine building components made of titanium materials are of great importance.
  • titanium materials tend to oxidize or sulfide at elevated temperature in the presence of gases.
  • the wear resistance of titanium materials to friction, erosion and fretting is limited.
  • titanium materials tend to stress corrosion cracking.
  • components made of titanium materials In order to improve the behavior of components made of titanium materials, it is known from the prior art to provide surface regions of components made of titanium materials with a metallic coating. By coating the scope of application of titanium components can be extended. Usually, components made of titanium materials are coated with nickel chemically or electrochemically or galvanized. It is also known from the prior art to coat components made of titanium materials with platinum, chromium, zinc or copper.
  • the document DE 20 35 659 A1 discloses a method of pretreating titanium components for subsequent electroplating.
  • the process comprises at least the steps of a) etching in an aqueous, acidic solution, b) active pickling in an aqueous, acidic solution, and c) activating in an acidic bath. This is followed by a galvanic coating with nickel.
  • the present invention is based on the problem to provide a novel method for the pretreatment of titanium components for the subsequent adherent coating thereof.
  • the method comprises at least the steps of a) etching the component in an acidic and fluoride-containing solution containing nitric acid (KNO 3 ); b) active etching of the etched component in a solution containing at least sodium nitrate (NaNO 3 ) and tetrafluoroboric acid (HBF 4 ); c) activating the activated pickled component in an acidic bath or an acidic, nickel-containing bath.
  • KNO 3 acidic and fluoride-containing solution containing nitric acid
  • HHF 4 tetrafluoroboric acid
  • the solution for the active pickling contains 20-50 g / l of sodium nitrate, 50-70 g / l of tetrafluoroboric acid and either 15-35 g / l of sodium hydroxide solution and 5-50 g / l of sodium tetrafluoroborate or 25-50 g / l of sodium and 45 g / l. 100 g / l fluorine
  • an adherent, metallic coating thereof can be realized.
  • the inventive method works with solutions for etching, active pickling and activating, which are free of hexavalent chromium. This is advantageous from a security point of view.
  • Another advantage of the method according to the invention is that it consists only of chemical process steps, so that accordingly components with complex geometries or complex shaped surfaces can be uniformly pretreated and coated.
  • Another advantage of the method is that a subsequent coating of the titanium components with z. B. nickel can be done without subsequent heat treatment of the coated components, resulting in cost advantages.
  • the inventive method is suitable especially for the pre-treatment of aluminum-based titanium base liners.
  • the subsequent Aktivbeizen is carried out at a temperature between 30-50 ° C, in particular at 50 ° C, for a period of 10-30 min.
  • a maximum process temperature of 50 ° C allows wax coverage for a subsequent selective coating. This considerably simplifies a selective coating.
  • the inventive method relates to the pretreatment of components made of titanium materials, in particular of aluminum-containing titanium-based alloys, for subsequent metallic coating thereof with, for example, nickel.
  • the pretreatment of the titanium components enables an adherent metallic coating of titanium components.
  • the titanium components are etched in an acidic solution in a first step of the process according to the invention.
  • the acidic and fluoride-containing solution used for etching contains at least nitric acid (HNO 3 ).
  • the component is preferably etched in an aqueous, acidic solution containing 100-350 g / l nitric acid (HNO 3 ) and preferably 20-50 g / l hydrofluoric acid (HF) or 30-70 g / l ammonium bifluoride (NH 4 HF 2 ) contains.
  • etching in the aqueous solution of nitric acid (HNO 3 ) and preferably hydrofluoric acid (HF) or ammonium bifluoride (NH 4 HF 2 ) is carried out at room temperature for a period of 1 to 6 minutes.
  • HF hydrofluoric acid
  • NH 4 HF 2 ammonium bifluoride
  • an active pickling of the etched component takes place.
  • the active pickling takes place in an acidic solution, with the active pickling the surface of the titanium component is roughened.
  • the solution used for the active pickling contains at least sodium nitrate (NaNO 3 ) and tetrafluoroboric acid (HBF 4 ).
  • the solution for active pickling contains at least 10-60 g / l of sodium nitrate (NaNO 3 ) and 30-90 g / l of tetrafluoroboric acid (HBF 4 ).
  • the solution used for active pickling contains sodium nitrate (NaNO 3 ) and tetrafluoroboric acid (HBF 4 ) in addition to the composition of such a solution then 25-50 g / l sodium (Na + ) and 45-100 g / l fluorine ( F - ) and 10-40 g / l NO 3 - contains.
  • a solution may be used which, in addition to sodium nitrate (NaNO 3 ) and tetrafluoroboric acid (HBF 4 ), also contains sodium hydroxide solution (NaOH) and sodium tetrafluoroborate (NaBF 4 ), the composition of such a solution then preferably being 20-50 g / l Sodium nitrate (NaNO 3 ), 50-70 g / l tetrafluoroboric acid (HBF 4 ), 15-35 g / l sodium hydroxide solution (NaOH) and 5-50 g / l sodium tetrafluoroborate (NaBF 4 ).
  • the pH of the solutions used for the active pickling is between 1.5 and 2.5.
  • the active etching of the etched component with one of the above solutions is preferably carried out at a temperature between 30 and 50 ° C, in particular at 50 ° C, for a period of between 10 and 30 minutes.
  • the titanium of the titanium material of vorzubehandelnden component is very active.
  • Metal ions are dissociated by redox reactions and metal is removed at the surface.
  • Aluminum ions migrate from the titanium alloy into the solution used for pickling, these aluminum ions, with the sodium ions and fluorine ions in the solution, forming a crystal layer on the surface of the titanium component.
  • the crystal layer consists of sodium aluminum fluoride (Na 3 AlF 6 ), which is also called cryolite.
  • a relatively large roughness wherein this roughness is important for the subsequent coating of the component.
  • the metal attack during the Aktivbeizens must be high enough and be inhibited by sufficient crystallization within a few minutes, this being realized by the above-defined solutions for Aktivbeizen.
  • the formation of the crystal layer during active pickling protects the titanium component on its surface from oxidation, so that the titanium remains active under the crystals. This makes it possible titanium components after the second step of the method according to the invention meantime to keep active for a relatively long period of time.
  • the active pickling takes place at a temperature between 30 and 50 ° C. This makes it possible, before activating surface portions of the component which are not subsequently to be coated, e.g. cover with wax.
  • the inventive method thus allows a selective metallic coating of selected surface areas, which is cheaper by the wax application than with other covering systems.
  • the crystallization taking place during the pickling process is also dependent on the roughness on the surface of the component obtained during the etching of the component. If too low or too high a roughness is formed on the surface of the component during the etching, then the crystals form unevenly during the subsequent active pickling, so that the active pickling does not take place optimally.
  • the process steps of etching and active etching accordingly depend on each other in their implementation.
  • an activation of the active-pickled component takes place.
  • the activation takes place immediately before the metallic coating of the component, wherein upon activation the crystal layer formed during the active pickling is dissolved in order to expose the activated titanium surface of the component to be coated.
  • This activation can be achieved by activating the activated pickled component either in an acidic bath or in an acidic, nickel-containing bath.
  • activation takes place in a bath containing nitric acid at a temperature of between 20 and 50 ° C for a period of between 15 and 40 seconds.
  • activation of the Ti64 alloy component in a nickel-containing bath is carried out at a temperature between 40 and 60 ° C. for a period of 20 to 60 seconds, the component subsequently being electroplated in this nickel-containing bath.
  • a bath change of the component after the activation and before coating and thus oxidation of the component during the bath change are avoided, whereby the adhesion of the metallic coating is improved on the component.
  • a component made of an aluminum-containing titanium alloy of the material TiA16V4 is etched in an aqueous solution in a first step, the aqueous solution containing 350 g / l of 65% nitric acid (HNO 3 ) and 67 g / l of ammonium bifluoride (NH 4 HF 2 ).
  • the etching is carried out at room temperature for a period of 2 minutes while stirring the aqueous solution.
  • the etched component is pickled in a solution containing 40 g / l sodium nitrate (NaNO 3 ), 60 g / l tetrafluoroboric acid (HBF 4 ), 30 g / l sodium tetrafluoroborate (NaBF 4 ) and 28 g / l sodium hydroxide (NaOH) and having a pH of about 1.7.
  • the active pickling takes place at a temperature of 50 ° C and for a period of 20 minutes.
  • activation is then carried out in a third step, namely in a 40% sulfuric acid at a temperature of 20 ° C for a period of 20 seconds.
  • a metallic coating of the component can be carried out, for which purpose the component is coated in a nickel sulfamate bath at a working temperature of 50 ° C up to a layer thickness of about 800 microns, and wherein the current density during galvanic Coating at 2 A / dm 2 is.
  • the resulting metallic coating has excellent adhesion.
  • the adhesion of the coating is between 210 and 300 N / mm 2 .
  • components of the TiA16V4 material are etched and actively pickled identical to the first embodiment, wherein the subsequent activation is carried out in an acidic nickel bath.
  • the nickel bath consists of 300 g / l nickel sulfate (NiSO 4 ), 20 g / l boric acid (H 3 BO 3 ), 8 ml / l nickel chloride (NiCl 2 ), 55 ml / l amine sulfone and wetting agent.
  • the activation in such a nickel bath takes place for a period of 45 seconds at 50 ° C, wherein after the expiration of the 45 seconds, a current to galvanic coating with a current density of 10 A / dm 2 is turned on. The coating in this bath is done for 15 minutes.
  • the thus pre-coated titanium components are placed in a nickel sulfamate bath and further coated at a temperature of 50 ° C with a current density of 2 A / dm 2 .
  • a metallic coating with excellent adhesive strength can be provided.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • ing And Chemical Polishing (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
EP06818072.8A 2005-11-21 2006-11-14 Verfahren zur vorbehandlung von titanbauteilen zur nachfolgenden beschichtung derselben Not-in-force EP1969162B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06818072T PL1969162T3 (pl) 2005-11-21 2006-11-14 Sposób obróbki wstępnej tytanowych elementów konstrukcyjnych w celu późniejszego ich powlekania

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005055303A DE102005055303A1 (de) 2005-11-21 2005-11-21 Verfahren zur Vorbehandlung von Titanbauteilen zur nachfolgenden Beschichtung derselben
PCT/DE2006/001992 WO2007059730A2 (de) 2005-11-21 2006-11-14 Verfahren zur vorbehandlung von titanbauteilen zur nachfolgenden beschichtung derselben

Publications (2)

Publication Number Publication Date
EP1969162A2 EP1969162A2 (de) 2008-09-17
EP1969162B1 true EP1969162B1 (de) 2015-02-25

Family

ID=37739580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06818072.8A Not-in-force EP1969162B1 (de) 2005-11-21 2006-11-14 Verfahren zur vorbehandlung von titanbauteilen zur nachfolgenden beschichtung derselben

Country Status (6)

Country Link
US (1) US8354036B2 (pl)
EP (1) EP1969162B1 (pl)
CA (1) CA2628623A1 (pl)
DE (1) DE102005055303A1 (pl)
PL (1) PL1969162T3 (pl)
WO (1) WO2007059730A2 (pl)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080169270A1 (en) * 2007-01-17 2008-07-17 United Technologies Corporation Method of removing a case layer from a metal alloy
DE102015213162A1 (de) * 2015-07-14 2017-01-19 MTU Aero Engines AG Verfahren zum galvanischen Beschichten von TiAl-Legierungen
GB201811056D0 (en) * 2018-07-05 2018-08-22 South West Metal Finishing Ltd Process
CN112981494A (zh) * 2021-02-08 2021-06-18 深圳市钧诚精密制造有限公司 一种具有高吸光率的钛合金微弧氧化工艺

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864732A (en) * 1953-10-05 1958-12-16 Battelle Development Corp Method of coating titanium articles and product thereof
US3207679A (en) * 1960-05-03 1965-09-21 American Potash & Chem Corp Method for electroplating on titanium
US3562013A (en) * 1967-10-23 1971-02-09 Diversey Corp Process of deoxidizing titanium and its alloys
US3725217A (en) * 1969-07-18 1973-04-03 Ionitech Labor Inc Plating titanium and zirconium and their alloys with nickel,chromium and other heavy metals
US4314876A (en) * 1980-03-17 1982-02-09 The Diversey Corporation Titanium etching solution
DE3133189C2 (de) * 1981-08-21 1984-02-09 MTU Motoren- und Turbinen-Union München GmbH, 8000 München "Verfahren zur Aktivierung von Titanoberflächen"
US4655884A (en) * 1985-08-19 1987-04-07 General Electric Company Nickel plating of refractory metals
DE3710950A1 (de) * 1987-04-01 1988-10-13 Licentia Gmbh Verfahren zum herstellen von aetzmustern in glasoberflaechen
US4938850A (en) 1988-09-26 1990-07-03 Hughes Aircraft Company Method for plating on titanium
US4902388A (en) 1989-07-03 1990-02-20 United Technologies Corporation Method for electroplating nickel onto titanium alloys
US5240734A (en) * 1991-05-31 1993-08-31 Healthy Foods Solutions Reduced-fat peanut butter compositions and methods for preparing same
ZA994331B (en) * 1998-07-09 2001-01-02 Unilever Plc Soup and sauce concentrates.
US6056815A (en) * 1999-03-08 2000-05-02 Em Industries, Inc. Methods and compositions related to pearlescent pigments
US20030219523A1 (en) * 2002-05-22 2003-11-27 Michael Foods Of Delaware, Inc. Formulated hollandaise sauce and process for preparation of the same

Also Published As

Publication number Publication date
CA2628623A1 (en) 2007-05-31
WO2007059730A3 (de) 2007-10-11
WO2007059730A2 (de) 2007-05-31
US8354036B2 (en) 2013-01-15
DE102005055303A1 (de) 2007-05-24
EP1969162A2 (de) 2008-09-17
PL1969162T3 (pl) 2015-07-31
US20090218232A1 (en) 2009-09-03

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