WO2006136334A2 - Materiau de depot electrolytique, procede permettant de former une couche anticorrosion de tio2 sur un substrat electroconducteur et substrat metallique recouvert d'une couche de tio2 - Google Patents

Materiau de depot electrolytique, procede permettant de former une couche anticorrosion de tio2 sur un substrat electroconducteur et substrat metallique recouvert d'une couche de tio2 Download PDF

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Publication number
WO2006136334A2
WO2006136334A2 PCT/EP2006/005791 EP2006005791W WO2006136334A2 WO 2006136334 A2 WO2006136334 A2 WO 2006136334A2 EP 2006005791 W EP2006005791 W EP 2006005791W WO 2006136334 A2 WO2006136334 A2 WO 2006136334A2
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WO
WIPO (PCT)
Prior art keywords
acid
electrodeposition material
layer
accelerator
electrically conductive
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PCT/EP2006/005791
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English (en)
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WO2006136334A3 (fr
Inventor
Subbian Karuppuchamy
Naoki Suzuki
Seishiro Ito
Matthias Schweinsberg
Hans Dolhaine
Frank Wiechmann
Christine Schröder
Original Assignee
Henkel Kommanditgesellschaft Auf Aktien
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Application filed by Henkel Kommanditgesellschaft Auf Aktien filed Critical Henkel Kommanditgesellschaft Auf Aktien
Publication of WO2006136334A2 publication Critical patent/WO2006136334A2/fr
Publication of WO2006136334A3 publication Critical patent/WO2006136334A3/fr

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials
    • C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
    • 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

  • Electrodeposition material process for providing a corrosion-protective layer Of TiO 2 on an electrically conductive substrate and metal substrate coated with a layer of TiO 2
  • the present invention relates to an electrodeposition material for the electrochemical deposition of a corrosion-protective layer of Ti ⁇ 2 on an electrically conductive substrate comprising a titanium compound, a complexing agent, water and optionally an accelerator, organic solvents, buffering agents and one or more additives.
  • a corrosion-protective layer of Ti ⁇ 2 on an electrically conductive substrate comprising a titanium compound, a complexing agent, water and optionally an accelerator, organic solvents, buffering agents and one or more additives.
  • Such Ti ⁇ 2 layer deposited electrochemically may serve as an appropriate primer layer for subsequent coating treatment (e.g. coating with organic materials, such as for instance lacquers, varnishes, paints, organic polymers, adhesives, etc.).
  • the present invention relates to a process for providing a corrosion-protective layer of TiO 2 on an electrically conductive substrate by electrodeposition of a electrodeposition material comprising a titanium compound, a complexing agent, water and optionally an accelerator, organic solvents, buffering agents and one or more additives.
  • the present invention relates to a metal substrate coated with a layer of TiO 2 produced by the process of the invention.
  • the very common industrial task involves providing metallic or non-metallic substrates with a first coating, which has a corrosion-inhibiting effect and/or which constitutes a primer for the application thereon of a subsequent coating containing e.g. organic polymers.
  • An example of such a task is the pre-treatment of metals prior to lacquer coating, for which various processes are available in the art. Examples of such processes are layer-forming or non-layer-forming phosphating, chromating or a chromium-free conversion treatment, for example using complex fluorides of titanium, zirconium, boron or silicon.
  • Technically simpler to perform, but less effective, is the simple application of a primer coat to a metal prior to lacquer-coating thereof. An example of this is the application of red lead.
  • a layer produced or applied in this way may serve as a corrosion-protective primer for subsequent lacquer coating.
  • the layer may also constitute a primer for subsequent bonding.
  • Metallic substrates in particular, but also substrates of plastics or glass, are frequently pre-treated chemically or mechanically prior to bonding in order to improve adhesion of the adhesive to the substrate.
  • metal or plastics components may be bonded metal to metal, plastics to plastics or metal to plastics.
  • front and rear windscreens of vehicles are as a rule bonded directly into the bodywork.
  • Other examples of the use of coupling layers are to be found in the production of rubber/metal composites, in which once again the metal substrate is as a rule pre- treated mechanically or chemically before a coupling layer is applied for the purpose of bonding with rubber.
  • the conventional wet or dry coating processes in each case exhibit particular disadvantages.
  • chromating processes are disadvantageous from both an environmental and an economic point of view owing to the toxic properties of the chromium and the occurrence of highly toxic sludge.
  • chromium- free wet processes such as phosphating, as a rule, also result in the production of sludge containing heavy metals, which has to be disposed of at some expense.
  • Another disadvantage of conventional wet coating processes is the actual coating stage frequently has to be preceded or followed by further stages, thereby increasing the amount of space required for the treatment line and the consumption of chemicals.
  • phosphating which is used virtually exclusively in automobile construction, entails serveral cleaning stages, an activation stage and generally a post-passivation stage. In all these stages, chemicals are consumed and waste is produced which has to be disposed of.
  • dry coating processes entail fewer waste problems, they have the disadvantage of being technically complex to perform (for example requiring a vacuum) or of having high energy requirements. The high operating costs of these processes are therefore a consequence principally of plant costs and energy consumption.
  • thin layers of metals compounds may be produced electrochemically on an electrically conductive substrate.
  • metals compounds for example oxide layers
  • an electrically conductive substrate for example, the articel by Y. Zhou and J. A. Switzer entitled ..Electrochemical Deposition and Microstructure of Copper (I) Oxide Films", Scripta Materialia, Vol. 38, No. 11 , pages 1731 to 1738 (1998), describes the electrochemical deposition and microstructure of copper (I) oxide films on stainless steel.
  • the article investigates above all the influence of deposition conditions on the morphology of the oxide layers; it does not disclose any practical application of the layers.
  • TiO 2 - layers are obtained on a Ti-sheet from H 2 SO 4 aqueous solution by anodic oxidation method. This is obtained at potentials below 50 V. However, this process can produce TiO 2 only on Ti-substrates by anodic oxidation.
  • TiO 2 is obtained on a Ti-sheet from an aqueous solution containing 0.5 mol/L H 2 SO 4 and 0.03 mol/L HNO 3 by anodic oxidation method (titanium anodization). Constant current is 1 mA/cm 2 . The oxidation is performed in a cooled bath of 278 K to 283 K. However, this process can produce TiO 2 only on a Ti-substrate by anodic oxidation.
  • EP 1 285 105 B1 discloses a process for producing a coating comprising at least two layers on an electrically conductive surface wherein in a first stage a chromium-free layer of at least one X-ray crystalline inorganic compound of at least one metal is electrochemically deposited of an electrically conductive surface from a solution containing the metal in dissolved form. Besides many other metals titanium is disclosed.
  • corrosion-protective layers of TiO 2 are electrochemically deposited on a metal substrate from an electrodeposition material comprising titanyl sulfate or titanyl oxalate as titanium component, citrate or citric acid, tatric acid and tartrates, lactid acid and lactates as chelating agents and hydroxylamines and their derivates or nitrates as accelerators.
  • this object can be achieved by the use of titanyl sulfate and/or titanyl oxalate as the titanium component combined with a special combination of complexing agents and accelerators.
  • Subject-matter of the present invention therefore is an electrodeposition material as specified above characterized in that the titanium compound is titanyl sulfate and/or titanyl oxalate, the complexing agent is selected from the group consisting of gluconic acid, gluconates, polyhydroxy-polycarbonic acids, ethylenediaminetetraacetate, methylglycinediacetate, iminodisuccinate, nitrilotriacetic acid and nitrilotriacetate, triethanolamine, phosphonic acid and phosphonates, poly-aspartic acid and polyaspartates, polyacrylic acid and polyacrlylates and the accelerator is selected from the group consisting of hydroxylamines and their derivates, nitrates, H 2 O 2 and organic peroxides.
  • the complexing agent is selected from the group consisting of gluconic acid, gluconates, polyhydroxy-polycarbonic acids, ethylenediaminetetraacetate, methylgly
  • the electrodeposition material preferably comprises 0,05 to 0,3 mol/l titanium compound, 0,01 to 0,2 mol/l complexing agent and 0,02 to 0,2 mol/l accelerator.
  • the pH of the electrodeposition material preferably is 5 to 10, more preferably 6 to 9, most preferably 7,5 to 8,0.
  • the electrodeposition material preferably comprises a polymeric cationic binder in addition to the components specified above.
  • cationic binder all electrodepositabel resins known in the art may be used.
  • cationic film-forming resins include amine salt group-containing resins such as the acid-solubilized reaction products of polyepoxides and primary or secondary amines. Usually, these amin salt group-containing resins are used in combination with a blocked isocyanate curing agent.
  • quaternary ammonium salt group-containing resins can also be employed. Examples of these resins are those which are formed from reacting an organic polyepoxide with a tertiary amin salt.
  • film-forming resins which cure via transesterification can be used.
  • cationic compositions prepared from Mannich bases can be used. From an electrodeposition material comprising the components of the present invention combined with a polymeric cationic binder a layer Of TiO 2 and a resinous layer can be deposited simultaneously.
  • the electrodeposition material of the present invention comprises the polymeric cationic binder in an amount of 5 to 60 % by weight based on the total weight of the electrodeposition material.
  • the present invention further relates to a process for providing a corrosion- protective layer of T ⁇ O 2 on an electrically conductive substrate by electrodeposition of a electrodeposition material comprising a titanium compound, a complexing agent, water and optionally an accelerator, organic solvents, buffering agents and one or more additives, characterized in that the titanium compound is titanyl sulfate and/or titanyl oxalate, the complexing agent is selected from the group consisting of gluconic acid, gluconates, polyhydroxy-polycarbonic acids, ethylenediaminetetraacetate, methylglycinediacetate, iminodisuccinate, nitrilotriacetic acid and nitrilotriacetate, triethanolamine, phosphonic acid and phosphonates, poly-aspartic acid and polyaspartates, polyacryl
  • the electrodeposition material of claims 2 to 5 may be used in that process.
  • the electrodeposition preferably is carried out under the following conditions current density: 0,01 to 100, preferably 0,1 to 20, more preferably 0,5 to 10 mA/cm 2 , coating time: 0,15 to 20, preferably 0,5 to 10, more preferably 1 to 4 minutes, temperature: 0 to 100, preferably 20 to 60 0 C, pH: 5 to 10, preferably 6 to
  • the electroconductive substrate preferably is selected from the group consisting of steel, especially cold rolled steel and galvanized steel, and aluminium.
  • the TiO 2 -layer is deposited on the electrically conductive substrate preferably within essentially uniform layer thickness, calculated as weight per unit area, in the range of from 0,01 to 3,5 g/m 2 , more preferably in the range of from 0,5 to 1 ,4 g/m 2 .
  • the titanium compound was dissolved in deionized water (accelerated by heating to 30 to 50 0 C)
  • the Complexing Agent was added.
  • the pH was adjusted by the addition of KOH (0,5 to 1 ,5 mol/l) at a temperature of 45 to 6O 0 C

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemically Coating (AREA)
  • Paints Or Removers (AREA)

Abstract

La présente invention concerne un matériau de dépôt électrolytique destiné au dépôt électrochimique d'une couche anticorrosion de TiO2 sur un substrat électroconducteur, lequel matériau comprend un composé titane, un agent complexant, de l'eau et, facultativement, un accélérateur, des solvants organiques, des agents de tamponnage et un ou plusieurs additifs, caractérisé en ce que le composé titane est un sulfate de titanyle et/ou un oxalate de titanyle, en ce que l'agent complexant est choisi dans le groupe composé de l'acide gluconique, des gluconates, des acides polyhydroxy-polycarboniques, de l'éthylènediaminetétraacétate, du méthylglycinediacétate, de l'iminodisuccinate, de l'acide nitrilotriacétique et du nitrilotriacétate, de la triéthanolamine, de l'acide phosphonique et des phosphonates, de l'acide poly-aspartique et des polyaspartates, de l'acide polyacrylique et des polyacrylates, et en ce que l'accélérateur est choisi dans le groupe composé des hydroxylamines et de leurs dérivés, des nitrates, du H2O2 et des peroxydes organiques. L'invention se rapporte en outre à un procédé permettant de former une couche anticorrosion de TiO2 sur un substrat électroconducteur, et à un substrat métallique recouvert d'une couche de TiO2.
PCT/EP2006/005791 2005-06-22 2006-06-16 Materiau de depot electrolytique, procede permettant de former une couche anticorrosion de tio2 sur un substrat electroconducteur et substrat metallique recouvert d'une couche de tio2 WO2006136334A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05013419.6 2005-06-22
EP05013419 2005-06-22

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Publication Number Publication Date
WO2006136334A2 true WO2006136334A2 (fr) 2006-12-28
WO2006136334A3 WO2006136334A3 (fr) 2007-04-05

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2867477A4 (fr) * 2012-06-28 2016-06-15 United Technologies Corp Traitement de l'extrémité d'une pale de soufflante d'une turbine à gaz
CN111321396A (zh) * 2020-04-01 2020-06-23 南宁学院 金属表面处理方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11158691A (ja) * 1997-11-25 1999-06-15 Murata Mfg Co Ltd チタン酸化物被膜作製用水溶液、およびチタン酸化物被膜の製造方法
DE10022074A1 (de) * 2000-05-06 2001-11-08 Henkel Kgaa Elektrochemisch erzeugte Schichten zum Korrosionsschutz oder als Haftgrund
EP1548157A1 (fr) * 2003-12-22 2005-06-29 Henkel KGaA Protection contre la corrosion par des couches d'oxide de métal électrochimiquement déposées sur des substrats métalliques

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11158691A (ja) * 1997-11-25 1999-06-15 Murata Mfg Co Ltd チタン酸化物被膜作製用水溶液、およびチタン酸化物被膜の製造方法
DE10022074A1 (de) * 2000-05-06 2001-11-08 Henkel Kgaa Elektrochemisch erzeugte Schichten zum Korrosionsschutz oder als Haftgrund
EP1394292A2 (fr) * 2000-05-06 2004-03-03 Henkel KGaA Couches de TiO2 formées par voie electrochimique et servant de protection anticorrosion ou de peinture primaire reactive
EP1548157A1 (fr) * 2003-12-22 2005-06-29 Henkel KGaA Protection contre la corrosion par des couches d'oxide de métal électrochimiquement déposées sur des substrats métalliques

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2867477A4 (fr) * 2012-06-28 2016-06-15 United Technologies Corp Traitement de l'extrémité d'une pale de soufflante d'une turbine à gaz
CN111321396A (zh) * 2020-04-01 2020-06-23 南宁学院 金属表面处理方法

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Publication number Publication date
WO2006136334A3 (fr) 2007-04-05

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