EP3307925A1 - Électrolyte pour oxydation par plasma électrolytique - Google Patents

Électrolyte pour oxydation par plasma électrolytique

Info

Publication number
EP3307925A1
EP3307925A1 EP16732922.6A EP16732922A EP3307925A1 EP 3307925 A1 EP3307925 A1 EP 3307925A1 EP 16732922 A EP16732922 A EP 16732922A EP 3307925 A1 EP3307925 A1 EP 3307925A1
Authority
EP
European Patent Office
Prior art keywords
electrolyte
electrolytic oxidation
plasma
light metal
pulses
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
Application number
EP16732922.6A
Other languages
German (de)
English (en)
Other versions
EP3307925B1 (fr
Inventor
Wolfgang Hansal
Selma Hansal
Rudolf Mann
Veronika GRMAN
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.)
Hirtenberger Engineered Surfaces GmbH
Original Assignee
Hirtenberger Engineered Surfaces 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 Hirtenberger Engineered Surfaces GmbH filed Critical Hirtenberger Engineered Surfaces GmbH
Publication of EP3307925A1 publication Critical patent/EP3307925A1/fr
Application granted granted Critical
Publication of EP3307925B1 publication Critical patent/EP3307925B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/024—Anodisation under pulsed or modulated current or potential
    • 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
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/026—Anodisation with spark discharge
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/26—Anodisation of refractory metals or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/30—Anodisation of magnesium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/34—Anodisation of metals or alloys not provided for in groups C25D11/04 - C25D11/32
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires

Definitions

  • the invention relates to an electrolyte for the plasma-electrolytic oxidation of workpieces produced from light metal and / or light alloys, comprising a salt solution, wherein at least one salt or a combination of two or more salts is selected from a group comprising metal salts, in particular borates, phosphates, nitrates, sulfates, Aluminates, silicates, manganites, molybdate, tungstates, and / or salts of organic acids, in particular methanesulfonates and / or amidosulfonates, and / or metal complexes and combinations thereof, and a method for this purpose.
  • metal salts in particular borates, phosphates, nitrates, sulfates, Aluminates, silicates, manganites, molybdate, tungstates, and / or salts of organic acids, in particular methanesulfonates and / or amidosulfonates, and / or
  • An additional possibility for controlling the layer properties is the incorporation of particles which are dispersed in the electrolyte.
  • the incorporation of unmodified oxides, carbides and nitrides using alternating current is described in the article by VN Malyshev, KM Zorin, "Features of microarc oxidation coatings formation technologies in slurry electrolytes", Appl. Surf. Be. 254 (2007), 1511-1516.
  • a control of the superficial charge of In this process particles are only possible via the pH of the electrolyte.
  • the plasma electrolytic oxidation process is possible only in certain pH ranges, which represents a significant limitation in the selection of the candidate particles.
  • inorganic non-metallic particles are suspended in this salt solution.
  • the inorganic non-metallic particles are preferably selected from a group which contains insoluble oxides, hydroxides or silicates in the salt solution of the electrolyte.
  • the inorganic non-metallic particles have an average diameter of at least 10 nm, and are preferably surface-modified, so that their surface energy and / or zeta potential is increased or reduced in terms of their initial state.
  • Such a surface modification causes the inorganic non-metallic particles to be uniformly suspended in the electrolyte, allowing uniform incorporation into the oxidation layer during the deposition process.
  • hydroxyl groups are chemically reactive and can be reacted, for example, with siloxanes according to the reaction scheme
  • This modification can be carried out both in an organic medium, such as toluene, and in aqueous solution.
  • a positive charge is achieved, for example, by the use of siloxanes having amino groups, e.g. 3-aminopropyltrimethoxysilane achieved.
  • the amino groups are protonated in an acidic medium, whereby the thus modified particle receives a positive surface charge.
  • 3-mercaptopropyltrimethoxysiloxane and the subsequent oxidation to sulfonic acid according to the reaction equation
  • R-SH + 3 H 2 0 2 - "a negative surface charge can be achieved in neutral and basic media ⁇ R-SO3H + 3H 2 0 (2).
  • the modification of the surface on the one hand causes a high surface charge of the particles in the electrolyte in question to prevent precipitation, on the other hand, the particles can be transported electrophoretically to the electrode surface in the course of the deposition process. In this way, the incorporation rate of the particles in the resulting oxide layer can be controlled via the electrical parameters.
  • the inorganic non-metallic particles are selected from a group comprising clay minerals, in particular bentonite, kaolinite and / or montmorillonite. These clay minerals naturally have a favorable surface energy or zeta potential, which leads to a stable electrolyte suspension.
  • the invention furthermore relates to a process for the plasma-electrolytic oxidation of workpieces produced from light metal and / or light metal alloys with an electrolyte according to the invention described above.
  • the plasma-electrolytic oxidation takes place by means of direct current, in particular at a voltage of 250 V to 700 V. It is particularly preferred here that the current density is between 1 A / dm 2 and 30 A / dm 2 .
  • Oxidation layers produced in this way have a particularly compact, dense layer which has only a very low porosity. Such a low porosity is particularly desirable when a particularly high corrosion resistance of the workpiece is required.
  • the plasma electrolytic oxidation is carried out by means of pulse methods, with anodic pulses preferably being applied at a voltage of 250 V to 700 V.
  • the current density be between 1 A / dm 2 and 30 A / dm 2 during the on fashionable pulses.
  • the use of the pulse method has the advantage that the plasma-chemical reaction at the surface of the workpiece can be controlled by targeted control of the pulses. This makes it possible, in particular, to achieve a low surface roughness and a lower porosity of the oxidation layer on the workpiece. Investigations by the applicant have also shown that a higher pulse frequency has a positive effect on the corrosion resistance of the coated workpieces.
  • additional cathodic pulses are applied whose voltage is preferably between 30 V and 200 V.
  • the current pulses have a duration of at least 5 ⁇ and are separated by pauses of at least 3 ⁇ .
  • the thickness and / or duration of the anodic and / or cathodic current pulses can also be varied during the production of the oxidation layer on the workpiece.
  • FIG. 1 shows a scanning electron micrograph of the surface of a surface-modified SiO 2 particles produced PEO layer.
  • FIG. 2 shows the EDX spectrum of the surface of FIG. 1;
  • FIG. 3 shows a scanning electron micrograph of a cross section through the PEO layer from FIG. 1;
  • FIG. 5 shows a scanning electron micrograph of the surface of a PEO layer produced with bentonite additive
  • FIG. 6 shows the EDX spectrum of the surface of FIG. 5;
  • FIG. 7 is a scanning electron micrograph of a cross section through the PEO layer of FIG. 5; FIG.
  • Fig. 8 shows the EDX spectrum of a cross section of the PEO layer
  • Aerosil 200 (a non-porous, amorphous silica having a specific surface area of 200 m 2 / g, Evonik Industries) were suspended in 1 l of n-butanol. Subsequently, a solution of 20 ml of 35% hydrochloric acid, 200 ml of 3-mercaptopropyltrimethoxysiloxane and 20 ml of water and a solution of 120 ml of 3-mercaptopropyltrimethoxysiloxane in 100 ml of n-butanol were added and the mixture was stirred at 40 ° C for 8 to 10 hours. Thereafter, a solution of 40 ml of 25% ammonia, 200 ml of 3-mercaptopropyltrimethoxysiloxane and 100 ml of n-butanol was added and the mixture was stirred overnight.
  • Aerosil 200 a non-porous, amorphous silica having a specific surface area of 200
  • modified Aerosil was taken up in 2 l of 35% H 2 O 2 and stirred at 60 ° C. for 24 hours in order to oxidise the surface-bonded thiol groups to sulfonic acid.
  • the thus-obtained surface-modified Aerosil was added to an electrolyte consisting of a solution of 3 g / L KOH and 3 g / L K 2 S 13 O 3 in a concentration of 30 g / L.
  • the substrate used was a 1 mm thick sheet of the industrially used 6082 aluminum alloy measuring 25 mm ⁇ 100 mm.
  • a bipolar rectangular pulse was used to produce the layer, the anodic and cathodic current density being 10 A / dm 2 and the respective pulse duration 500 MS, which corresponds to a frequency of 1 kHz.
  • the coating time was 30 minutes.
  • the scanning electron images according to FIGS. 1 and 3 and the associated EDX spectra according to FIGS. 2 and 4 show the formation of a compact, dense layer due to the presence of the surface-modified particles in the electrolyte, which in contrast to the particle-free produced layers only one has low porosity.
  • Example 2 Layer with bentonite a. ) Preparation of the electrolyte
  • the substrate used was a 1 mm thick sheet of the copper-containing aluminum alloy 2017 with the dimensions 25 mm x 100 mm.
  • a bipolar rectangular pulse was used to produce the layer, the anodic and cathodic current density being 10 A / dm 2 and the respective pulse duration 500 ⁇ , which corresponds to a frequency of 1 kHz.
  • the coating time was 30 minutes.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

Électrolyte d'oxydation par plasma électrolytique de pièces réalisées en métal léger et/ou en alliages de métaux légers, contenant une solution saline, au moins un sel ou une combinaison d'au moins deux sels étant sélectionné(e) dans un groupe constitué de sels métalliques, notamment du borate, phosphate, nitrate, sulfate, aluminate, silicate, manganate, molybdate, wolframate et/ou de sels d'acides organiques, notamment de méthanesulfonate et/ou d'amidosulfonate et/ou de complexes métalliques ainsi que leurs combinaisons, des particules non métalliques inorganiques de ces solutions salines étant mises en suspension. L'invention concerne également un procédé d'oxydation par plasma électrolytique de pièces réalisées en métal léger et/ou en alliages de métaux légers.
EP16732922.6A 2015-06-09 2016-06-09 Procédé pour oxydation par plasma électrolytique Active EP3307925B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50467/2015A AT516503B1 (de) 2015-06-09 2015-06-09 Elektrolyt zur plasmaelektrolytischen oxidation
PCT/AT2016/050188 WO2016197175A1 (fr) 2015-06-09 2016-06-09 Électrolyte pour oxydation par plasma électrolytique

Publications (2)

Publication Number Publication Date
EP3307925A1 true EP3307925A1 (fr) 2018-04-18
EP3307925B1 EP3307925B1 (fr) 2019-03-13

Family

ID=56097372

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16732922.6A Active EP3307925B1 (fr) 2015-06-09 2016-06-09 Procédé pour oxydation par plasma électrolytique

Country Status (5)

Country Link
EP (1) EP3307925B1 (fr)
AT (1) AT516503B1 (fr)
DK (1) DK3307925T3 (fr)
ES (1) ES2739548T3 (fr)
WO (1) WO2016197175A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3875636A1 (fr) 2020-03-03 2021-09-08 RENA Technologies Austria GmbH Procédé d'oxydation électrolytique plasma d'un substrat métallique
CN112301401B (zh) * 2020-10-29 2022-01-14 中国第一汽车股份有限公司 一种镁合金表面处理方法
CN114657621B (zh) * 2020-12-24 2023-11-10 中国科学院上海硅酸盐研究所 一种提高镁合金表面微弧多孔氧化镁涂层抗腐蚀性的方法
CN113005498A (zh) * 2021-02-22 2021-06-22 佳木斯大学 一种自润滑锆基非晶合金及其制备方法和应用
CN114381778B (zh) * 2021-12-20 2023-12-01 中国兵器科学研究院宁波分院 一种镁及镁合金表面制备钽生物涂层的方法

Family Cites Families (11)

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DD151330A1 (de) * 1980-06-03 1981-10-14 Peter Kurze Verfahren zur herstellung von diffusionsschichten in metallen
DE19912502A1 (de) * 1999-03-19 2000-09-21 Inst Neue Mat Gemein Gmbh Nanoskalige Teilchen, Komplexe mit Polynukleotiden und deren Verwendung
GB0126467D0 (en) * 2001-11-03 2002-01-02 Accentus Plc Deposition of coatings on substrates
GB2386907B (en) * 2002-03-27 2005-10-26 Isle Coat Ltd Process and device for forming ceramic coatings on metals and alloys, and coatings produced by this process
CN101555597A (zh) * 2009-05-13 2009-10-14 大连理工大学 一种镍钛合金表面氧化钛生物活性涂层的制备方法
KR101067743B1 (ko) * 2009-11-18 2011-09-28 한국생산기술연구원 마그네슘 또는 마그네슘 합금의 양극산화 표면 처리 방법
US8888982B2 (en) * 2010-06-04 2014-11-18 Mks Instruments Inc. Reduction of copper or trace metal contaminants in plasma electrolytic oxidation coatings
MX2013008785A (es) * 2011-02-08 2014-01-24 Cambridge Nanolitic Ltd Revestimiento no metalico y metodo para su produccion.
DE102011007424B8 (de) * 2011-04-14 2014-04-10 Helmholtz-Zentrum Geesthacht Zentrum für Material- und Küstenforschung GmbH Verfahren zur Herstellung einer Beschichtung auf der Oberfläche eines Substrats auf Basis von Leichtmetallen durch plasmaelektrolytische Oxidation und beschichtetes Substrat
US8808522B2 (en) * 2011-09-07 2014-08-19 National Chung Hsing University Method for forming oxide film by plasma electrolytic oxidation
KR101433832B1 (ko) * 2013-02-04 2014-08-26 조호현 내식성을 강화한 마그네슘 케로나이트 방법

Also Published As

Publication number Publication date
EP3307925B1 (fr) 2019-03-13
AT516503B1 (de) 2016-06-15
ES2739548T3 (es) 2020-01-31
AT516503A4 (de) 2016-06-15
DK3307925T3 (da) 2019-06-24
WO2016197175A1 (fr) 2016-12-15

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