US20140131209A1 - Electrolyte and its use for the deposition of black ruthenium coatings and coatings obtained in this way - Google Patents

Electrolyte and its use for the deposition of black ruthenium coatings and coatings obtained in this way Download PDF

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Publication number
US20140131209A1
US20140131209A1 US14/126,769 US201214126769A US2014131209A1 US 20140131209 A1 US20140131209 A1 US 20140131209A1 US 201214126769 A US201214126769 A US 201214126769A US 2014131209 A1 US2014131209 A1 US 2014131209A1
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Prior art keywords
electrolyte
ruthenium
chloride
acid
bromide
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Abandoned
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US14/126,769
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English (en)
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Philip Schramek
Martin Stegmaier
Mario Tomazzoni
Frank Oberst
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Umicore Galvanotechnik GmbH
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Umicore Galvanotechnik GmbH
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Assigned to UMICORE GALVANOTECHNIK GMBH reassignment UMICORE GALVANOTECHNIK GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OBERST, FRANK, SCHRAMEK, PHILIP, STEGMAIER, MARTIN, TOMAZZONI, MARIO
Publication of US20140131209A1 publication Critical patent/US20140131209A1/en
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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
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/50—Electroplating: Baths therefor from solutions of platinum group metals
    • 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
    • C25D3/50—Electroplating: Baths therefor from solutions of platinum group metals
    • C25D3/52—Electroplating: Baths therefor from solutions of platinum group metals characterised by the organic bath constituents used
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/005—Jewels; Clockworks; Coins
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/10—Electrodes, e.g. composition, counter electrode

Definitions

  • the invention relates to a ruthenium electrolyte which is suitable for the deposition of decorative and technical layers having a particular blackness.
  • the invention further relates to the use of the electrolyte of the invention in a process for the deposition of decorative and industrial layers of ruthenium having a particular blackness (“black ruthenium”) on jewelry, decorative goods, consumer goods and industrial articles.
  • black ruthenium a particular blackness
  • the invention therefore likewise relates to corresponding layers and the articles coated in this way.
  • Consumer goods and industrial articles, jewelry and decorative goods are coated with thin oxidation-stable metal layers for protection against corrosion and/or for optical upgrading. These layers have to be mechanically stable and should not display tarnishing or wear phenomena even on prolonged use.
  • a proven way of producing such layers are electroplating processes by means of which many metal and alloy layers can be obtained in high-quality form. Examples which are well known from everyday life are electrolytically deposited bronze and brass layers on door handles or knobs, chrome coatings on vehicle parts, zinc-plated tools or gold plating on watch straps.
  • a particular challenge in the field of electroplating is to produce oxidation-stable and mechanically strong metal layers which have a black color and can be of interest not only in the decorative and jewelry sector but also for industrial applications, for example in the field of solar technology. Only a few metals are available for the production of oxidation-stable, black layers. Apart from ruthenium, rhodium and nickel are suitable. The use of the noble metal rhodium is restricted to the jewelry sector because of the high raw material costs. The use of inexpensive nickel and nickel-containing alloys is possible only in exceptional cases and with observance of strict regulations, especially in the jewelry and consumer goods sector, since nickel and nickel-containing metal layers are contact allergens. The use of ruthenium is an attractive alternative for all the fields of application described.
  • Electrolytes for producing black ruthenium layers in electrolytic plating processes are known in the prior art.
  • the most widely used baths contain ruthenium in the form of a complex with amidosulfonic acid or ruthenium as nitridochloro or nitridobromo complex (U.S. Pat. No. 6,117,301, U.S. Pat. No. 3,576,724, JP63259095, WO2001/011113, DE19741990, U.S. Pat. No. 4,375,392, JP2054792, EP1975282).
  • the pH of the baths is frequently in the acid range.
  • DE1959907 describes the use of binuclear ruthenium complexes [Ru 2 NCl x Br 8-x (H 2 O) 2 ] 3 ⁇ in an electroplating bath.
  • the nitridochloro complex [Ru 2 NCl 8 (H 2 O) 2 ] 3 ⁇ is used.
  • JP56119791 relates to a ruthenium electrolyte which contains from 1 to 20 g/l of ruthenium together with one or more compounds selected from the group consisting of dicarboxylic and tricarboxylic acids, benzenesulfonic acid, N-containing aromatics and amino acids or derivatives of the compounds mentioned and in which from 0.01 to 10 g/l of a thio compound as blackening additive are additionally used.
  • black layers For upgrading jewelry and decorative goods, black layers have to have not only an excellent mechanical adhesive strength but also a defect-free optical quality. They have to be able to be produced as required in bright or matte form and with a very deep blackness. The same applies for applications in the industrial sector, in particular in solar technology. Black layers for upgrading consumer goods also have to satisfy demanding requirements in terms of the mechanical stability. In particular, they must not have any black abrasion even on frequent use over a long period of time.
  • ruthenium baths and processes described in the prior art which satisfy these requirements either require the use of toxicologically problematical compounds such as thio compounds as blackening additive or contain a further transition metal to provide the required mechanical adhesive strength, which makes maintenance of the bath during the deposition process difficult.
  • acid baths allow deposition only on metals which have a relatively noble character.
  • U.S. Pat. No. 4,082,625 light-colored ruthenium deposits can also be obtained in the alkaline range.
  • U.S. Pat. No. 350,049 describes a process for the deposition of ruthenium in a pH range of 9-10. The ruthenium is kept in solution in this pH range by means of complexing anions (EDTA, NTA, CDTA). Stable but light-colored deposits of ruthenium are obtained.
  • the nitridochloro complex of ruthenium is also used in the aqueous, nonacidic bath for the electrodeposition of ruthenium which is described in U.S. Pat. No. 4,297,178. It additionally contains oxalic acid or an oxalate anion. It is questionable whether the deposits produced in this way have an appropriate blackness.
  • an electrolyte having a pH of from ⁇ 5 to 12 for the deposition of decorative and industrial layers of ruthenium having a particular blackness which electrolyte has the following constituents:
  • the electrolyte provides very resistant and extremely black deposits of ruthenium on conductive, in particular metallic, articles.
  • the deposition of black ruthenium coatings on conductive, in particular metallic, articles was hitherto possible only when using strongly acidic electrolytes. To avoid attack on the substrate in the case of base metals to be coated, these therefore had to be provided with corrosion-resistant intermediate layers (gold, palladium or palladium/nickel, etc.) before coating.
  • the electrolyte of the invention makes it possible also to work in a medium in which substrates composed of die-cast zinc, brass or bronze can be plated without intermediate coating.
  • Ruthenium can be used in the form of a water-soluble compound known to those skilled in the art, preferably as a binuclear, anionic nitrido halo complex of the formula [Ru 2 N(H 2 O) 2 X 8 ] 3 ⁇ , where X is a halide ion. Particular preference is given to the chloro complex [Ru 2 N(H 2 O) 2 Cl 8 ] 3 ⁇ .
  • the amount of the complex in the electrolyte of the invention can preferably be selected so that the concentration of ruthenium after complete dissolution of the compound is in the range from 0.5 to 10 gram per liter of electrolyte, calculated as ruthenium metal.
  • the finished electrolyte particularly preferably contains from 1 to 8 gram of ruthenium per liter of electrolyte, very particularly preferably from 3 to 6 gram of ruthenium per liter of electrolyte. Preference is given to exclusively ruthenium being deposited from the electrolyte of the invention. In this case, the electrolyte contains no further transition metal ions in addition to ruthenium.
  • the electrolyte contains particular organic compounds which have one or more carboxylic acid groups. These are in particular dicarboxylic, tricarboxylic or tetracarboxylic acids. These are adequately known to those skilled in the art and can be found, for example, in the literature (Beyer-Walter, Lehrbuch der Organischen Chemie, 22nd edition, S. Hirzel-Verlag, p. 324 ff). In this context, particular preference is given to acids selected from the group consisting of oxalic acid, citric acid, tartaric acid, succinic acid, maleic acid, glutaric acid, adipic acid, malonic acid, malic acid. The acids are naturally present in their anionic form in the electrolyte at the pH to be set.
  • the carboxylic acids mentioned here are added to the electrolyte in a concentration of 0.05-2 mol per liter, preferably 0.1-1 mol per liter and very particularly preferably 0.2-0.5 mol per liter. This applies particularly to the use of oxalic acid which is assumed also to serve as conducting salt in the electrolyte.
  • sulfur compounds are likewise present in the electrolytes in question here.
  • These are in particular one or more sulfur compounds which contain at least one sulfur atom in a heterocyclic ring system (sulfur heterocycle) (Beyer-Walter, Lehrbuch der Organischen Chemie, 22nd edition, S. Hirzel-Verlag, p. 703 ff).
  • sulfur heterocycle can be optionally aromatic or fully or partially saturated five- or six-membered rings based on carbon or corresponding fused ring systems which contain at least one sulfur atom and/or at least one further heteroatom such as nitrogen.
  • the sulfur heterocycles to be used are preferably sufficiently water-soluble to be able to be used effectively in the appropriate concentration range in the electrolyte.
  • Preferred compounds are those selected from the group consisting of 3-(2-benzothiazolyl-2-mercapto)propanesulfonic acid sodium salt, saccharin sodium salt, saccharin-N-propylsulfonate sodium salt, 6-methyl-3,4-dihydro-1,2,3-oxathiazin-4-one 2,2-dioxide, benzothiazole, 2-mercaptobenzothiazole, thiazole, isothiazole and derivatives thereof.
  • the sulfur heterocycle contributes to the deep blackening in the deposition of the ruthenium.
  • the sulfur heterocycle is used in a concentration of from 0.001 to 4 mol per liter, preferably from 0.002 to 1 mol per liter and very particularly preferably in a concentration of from 0.004 to 0.01 mol per liter, in the electrolyte.
  • One or more surface-active substances of the cationic surfactant type are likewise present in the electrolyte.
  • Possible surfactants of this type are, in particular, quaternary ammonium salts. These are adequately known to those skilled in the art (Beyer-Walter, Lehrbuch der Organischen Chemie, 22nd edition, S. Hirzel-Verlag, p. 251 ff).
  • ammonium salts selected from the group consisting of octyl-trimethylammonium bromide, octyltrimethylammonium chloride, decyltrimethyl-ammonium bromide, decyltrimethylammonium chloride, dodecyltrimethylammonium bromide, dodecyltrimethylammonium chloride, tetradecyltrimethylammonium bromide, tetradecyltrimethylammonium chloride, hexadecyltrimethylammonium bromide, hexadecyltrimethylammonium chloride, ethyldimethylhexadecylammonium bromide, ethyldimethylhexadecylammonium chloride, benzyldimethyldecylammonium chloride, benzyldimethyldodecylammonium chloride, benzyldimethyltetradecy
  • the cationic surfactants under consideration here are used in a concentration of 0.1-20 mmol per liter, preferably 0.5-10 mmol per liter and very particularly preferably from 1 to 5 mmol per liter, in the electrolyte and are likewise decisive for a deeper black of the deposited layer.
  • the pH of the electrolyte is preferably in the only weakly acidic to alkaline range.
  • the pH is preferably set to a value in the range from 5 to 12.
  • the pH of the electrolyte during use is more preferably in the range from 6 to 9, particularly preferably from 7 to 8.
  • a pH of about 7.5 is especially preferably set.
  • the pH is kept constant by addition of buffer substances. These are adequately known to those skilled in the art (Handbook of Chemistry and Physics, CRC Press, 66th Edition, D-144 ff).
  • Preferred buffer systems are borate, phosphate and carbonate buffers. Compounds for producing these buffer systems can be selected from the group consisting of boric acid, potassium dihydrogenphosphate, dipotassium hydrogenphosphate, potassium hydrogencarbonate and dipotassium carbonate.
  • the buffer system is used in a concentration of 0.08-1.15 mol per liter, preferably 0.15-0.65 mol per liter and very particularly preferably 0.2-0.4 mol per liter (based on
  • the present invention likewise provides for the use of the electrolyte of the invention.
  • a person skilled in the art will immerse the conductive, in particular metallic, article to be coated as cathode in the electrolyte and bring about a flow of electric current between the anode and the cathode.
  • the use of the electrolyte of the invention is preferably carried out in the same advantageous embodiments which have been described above for the electrolyte.
  • the flow of electric current should be sufficient to bring about the deposition of the black ruthenium coatings on the conductive, in particular metallic, article within an acceptable period of time.
  • a person skilled in the art will know the strength of the electric field which has to be set for this.
  • a current density of 0.1-10 A/dm 2 is preferably set.
  • the current density is particularly preferably from 0.2 to 5 A/dm 2 and very particularly preferably from 0.5 to 2 A/dm 2 .
  • the temperature of the electrolyte during deposition can be set appropriately by a person skilled in the art.
  • the temperature range to be set is advantageously 10-80° C.
  • Preference is given to setting a temperature of from 50° to 75° C. and particularly preferably 60° and 70° C. It can be advantageous for the electrolyte in question to be stirred during deposition.
  • anode it is likewise possible to select embodiments which a person skilled in the art would consider for this purpose. Preference is given to using anodes made of a material selected from the group consisting of platinized titanium, graphite, iridium-transition metal mixed oxide and special carbon material (“Diamond-Like Carbon”, DLC) or combinations thereof. Insoluble anodes made of a platinized titanium or iridium-transition metal mixed oxide have been found to be advantageous. Particular preference is given to using an anode made of platinized titanium.
  • the present invention likewise provides black ruthenium layers which can be obtained by the process of the invention.
  • the layers have a thickness of from 0.1 to 3 ⁇ m, preferably from 0.2 to 1.5 ⁇ m and very particularly preferably from 0.3 to 1.3 ⁇ m.
  • the layer of the invention has a sulfur content of from 3% by weight to 6% by weight, preferably from 3.1% by weight to 5% by weight and particularly preferably from 3.2% by weight to 4.5% by weight, in its outer region (viewed from the visible surface inward) of about 1.1 ( ⁇ 0.2) ⁇ m.
  • the sulfur content is especially preferably about 4% by weight.
  • the ruthenium layer also has a carbon content of from 1% by weight to 2% by weight, preferably from 1.1% by weight to 1.8% by weight and very particularly preferably from 1.15% by weight to 1.5% by weight, in the same outer region.
  • the value is especially preferably about 1.2% by weight.
  • the ruthenium layer has an oxygen content of from 15% by weight to 20% by weight, preferably from 16% by weight to 19% by weight and particularly preferably from 17% by weight to 18.5% by weight, in the same outer region.
  • the oxygen content here is especially preferably about 18% by weight. It appears to be particularly advantageous for the concentration of sulfur in this layer under consideration to have a gradient with the concentration increasing from the outside inward.
  • a concentration of sulfur directly at the surface of about 2% by weight which can increase in an inward direction to 5% by weight is often measured.
  • the values determined here have been determined by the GDOES method (Glow Discharge Optical Emission Spectrometry; R. Kenneth Marcus, Jose Broekaert: Glow Discharge Plasma in Analytical Spectroscopy, Wiley ISBN 0-471-60699-5 and Thomas Nelis, Richard Payling: Glow Discharge Optical Emission Spectroscopy—A Practical Guide, Royal Society of Chemistry, ISBN 0-85404-521-X).
  • the invention further provides particular articles such as decorative goods, consumer goods and industrial articles which have a layer according to the invention. Particular preference is given to articles in the case of which corresponding deposition in the acid range is not possible because of their base metal character.
  • the pieces of jewelry, decorative goods, consumer goods or industrial articles dip into the electrolyte of the invention and form the cathode.
  • An anode made of, for example, platinized titanium product information for PLATINODE® from Umicore Galvanotechnik GmbH
  • An appropriate flow of electric current between the anode and the cathode is subsequently applied.
  • a maximum current density of 10 ampere per square decimeter [A/dm 2 ] should not be exceeded. Above this value, proportions of amorphous ruthenium can be deposited.
  • the layers can be nonuniform and have dark abrasion under mechanical stress.
  • the current density selected is also determined by the type of coating process. In a barrel plating process, the preferred current density is in the range from 0.1 to 1 A/dm 2 . In rack plating processes, a current density of from 0.5 to 5 A/dm 2 leads to optically defect-free black ruthenium layers.
  • the ruthenium electrolyte described which is provided by the present invention, is particularly well-suited in a process for the deposition of decorative deep black and optionally bright layers, for example on jewelry and decorative goods.
  • the latter are likewise provided by the present invention.
  • the electrolyte can preferably be used in barrel and rack plating processes.
  • the electrolyte described here makes it possible to produce particularly compact and deep black deposits (L up to 50) of ruthenium on the appropriate material (see drawing 1, which shows the results of the comparative example and of example 1 according to the invention).
  • Color values were measured on the resulting layers using a standard color measuring instrument according to the CIE-L* a* b* system.
  • the layers were also examined by means of GDOES (Glow Discharge Optical Emission Spectroscopy).
  • the specimens are “sputtered-off” over an approximately flat plane in an argon plasma and excited to emit specific radiation.
  • the radiation is detected in an optical spectrometer.
  • the calculation of concentrations and depths is carried out by multimatrix calibration.
  • a brass sheet is dipped in an electrolyte which has the compositions described below.

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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)
  • Electroplating And Plating Baths Therefor (AREA)
US14/126,769 2011-06-17 2012-06-08 Electrolyte and its use for the deposition of black ruthenium coatings and coatings obtained in this way Abandoned US20140131209A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP102011105207.4 2011-06-17
DE102011105207.4A DE102011105207B4 (de) 2011-06-17 2011-06-17 Elektrolyt und seine Verwendung zur Abscheidung von Schwarz-Ruthenium-Überzügen und so erhaltene Überzüge und Artikel
PCT/EP2012/060924 WO2012171856A2 (en) 2011-06-17 2012-06-08 Electrolyte and its use for the deposition of black ruthenium coatings and coatings obtained in this way

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US (1) US20140131209A1 (ja)
EP (1) EP2723922B1 (ja)
JP (1) JP2014519555A (ja)
KR (1) KR20140033424A (ja)
CN (1) CN104040033B (ja)
DE (1) DE102011105207B4 (ja)
ES (1) ES2754262T3 (ja)
WO (1) WO2012171856A2 (ja)

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CN105018908A (zh) * 2015-03-23 2015-11-04 深圳市贝加电子材料有限公司 用于线路板表面处理的化学镀钌溶液和线路板表面处理方法
PL3159435T3 (pl) * 2015-10-21 2018-10-31 Umicore Galvanotechnik Gmbh Dodatek do elektrolitów do stopu srebro-palladowego
EP3818571B1 (en) 2018-07-06 2023-08-09 Merlin Solar Technologies, Inc. Method for blackening a metallic article
DE102019109188B4 (de) * 2019-04-08 2022-08-11 Umicore Galvanotechnik Gmbh Verwendung eines Elektrolyten zur Abscheidung von anthrazit/schwarzen Rhodium/Ruthenium Legierungsschichten
CN110965088A (zh) * 2019-08-27 2020-04-07 周大福珠宝金行（深圳）有限公司 一种黄金的复古工艺以及复古黄金
DE102020131371A1 (de) 2020-11-26 2022-06-02 Umicore Galvanotechnik Gmbh Rutheniumlegierungsschicht und deren Schichtkombinationen
US11558010B2 (en) 2021-02-22 2023-01-17 Merlin Solar Technologies, Inc. Method for blackening an electrical conduit

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WO2012171856A2 (en) 2012-12-20
EP2723922A2 (en) 2014-04-30
EP2723922B1 (en) 2019-08-28
CN104040033B (zh) 2017-12-19
WO2012171856A3 (en) 2014-03-27
DE102011105207B4 (de) 2015-09-10
DE102011105207A1 (de) 2012-12-20
ES2754262T3 (es) 2020-04-16
JP2014519555A (ja) 2014-08-14
CN104040033A (zh) 2014-09-10
KR20140033424A (ko) 2014-03-18

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