EP3190208B1 - Stromlose nickelplattierungsbäder mit aminonitrilen und verfahren zur abscheidung von nickel und nickellegierungen - Google Patents

Stromlose nickelplattierungsbäder mit aminonitrilen und verfahren zur abscheidung von nickel und nickellegierungen Download PDF

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EP3190208B1
EP3190208B1 EP16150307.3A EP16150307A EP3190208B1 EP 3190208 B1 EP3190208 B1 EP 3190208B1 EP 16150307 A EP16150307 A EP 16150307A EP 3190208 B1 EP3190208 B1 EP 3190208B1
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Prior art keywords
plating bath
nickel
nickel plating
electroless nickel
aqueous electroless
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English (en)
French (fr)
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EP3190208A1 (de
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Heiko Dr. Brunner
Simon Pape
Iulia Dr. Bejan
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Atotech Deutschland GmbH and Co KG
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Atotech Deutschland GmbH and Co KG
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Priority to EP16150307.3A priority Critical patent/EP3190208B1/de
Priority to PCT/EP2017/050132 priority patent/WO2017118655A1/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/31—Coating with metals
    • C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
    • C23C18/34—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron using reducing agents
    • C23C18/36—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron using reducing agents using hypophosphites
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/31—Coating with metals
    • C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
    • C23C18/34—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron using reducing agents
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/48—Coating with alloys
    • C23C18/50—Coating with alloys with alloys based on iron, cobalt or nickel

Definitions

  • the present invention relates to aqueous electroless nickel plating bath.
  • the present invention relates further to a method for depositing of nickel and nickel alloys utilizing the aqueous electroless nickel plating bath.
  • the aqueous electroless nickel plating baths have high stability against undesired decomposition.
  • Such coatings are suitable as a functional coating in aerospace, automotive, electronics and chemical industries.
  • the metal layers deposited from such aqueous electroless nickel plating baths are also useful as barrier and cap layers in semiconducting devices, printed circuit boards, IC substrates and the like.
  • the metal layers deposited are also suitable as overcoat for hard disks or rigid memory disks (RMD).
  • Barrier layers are used in electronic devices such as semiconducting devices, printed circuit boards, IC substrates and the like to separate layers of different composition, e.g. substrate layers and further layers, and thereby prevent undesired diffusion between such layers of different compositions.
  • barrier layer materials in electronic devices is as a cap layer which is e.g. deposited onto copper to prevent corrosion of copper.
  • Rigid memory disks are used as magnetic data storage media in hard disk drives.
  • the disks are basically composed of a substrate, made of aluminium, glass or ceramics.
  • An overcoat is deposited onto the substrate by a vacuum deposition process or an electroless metal plating process.
  • the overcoat may consist of various metallic, mostly non-magnetic, alloys one of which may be a nickel phosphorus alloy layer.
  • the overcoat provides e.g. a smooth surface onto which the magnetic recording layers are deposited. Further protective layers are coated onto the recording layers. Another application of nickel and nickel alloy deposits is corrosion protection for various substrates.
  • Typical stabilising agents are heavy metal ions such as lead. However, due to environmental requirements such heavy metal ions have to be avoided wherever possible. Heavy metal ion free stabilisers are therefore required.
  • Aqueous electroless nickel plating bath for applying nickel coatings are well known in the art and plating processes and plating baths are described in numerous publications such as U.S. Patents Nos. 2,935,425 ; 3,338,726 ; 3,597,266 ; 3,915,716 and 4,780,342 .
  • Electroless plating generally describes methods without using external current sources for reduction of metal ions. Plating processes using external current sources are commonly described as electrolytic or galvanic plating methods.
  • chemical reducing agents like hypophosphite, boranes or formaldehyde are used to reduce the metal ions to their metallic form and thereby forming a deposit on the substrate.
  • NiP deposition solutions comprise at least three ingredients dissolved in a solvent, typically water. They are (1) a source of the nickel ions, (2) a reducing agent and (3) a complexing agent for metal ions sufficient to prevent their precipitation in solution. A large number of suitable complexing agents for NiP solutions are described in the above noted publications. If hypophosphite is used as the reducing agent, the deposit will contain nickel and phosphorous. Similarly, if an aminoborane is employed, the deposit will contain nickel and boron as shown in U.S. Pat. No. 3,953,654 .
  • Alkyl isonitriles are known to be stabilizers for electroless nickel phosphorous plating baths from S. Watanabe, Journal of the Surface Finishing Society Japan 2012, 63, 369 . However, this document also teaches that alkyl nitriles such as pentyl nitrile and pivaloyl nitrile do not have any stabilising effect on electroless nickel plating baths (see inter alia table 4 and figure 4 therein).
  • GB 1 555 709 discloses an aqueous electroless nickel plating bath comprising at least one source of nickel ions, a reducing agent for nickel ions and 3,3'-iminodipropionitrile as a possible stabilizer.
  • aqueous electroless nickel plating bath which comprises at least one source of nickel ions and which is characterised in that it comprises at least one aminopropanenitrile derivative as defined in claim 1.
  • Aminopropanenitrile (more precisely the typically used regiosiomer 3-aminopropanenitrile) is represented by formula (I)
  • Aminopropanenitrile derivatives comprise other molecular structures which are bound to the nitrogen atom of the amino moiety instead of one or two hydrogen atoms depicted in formula (I).
  • Said molecular structures include inter alia alkyl, aryl, alkaryl which may comprise cyclic ring systems optionally incorporating the nitrogen atom(s) of the amino group(s).
  • the aminopropanenitrile derivatives optionally comprise more than one 3-aminopropanenitrile moiety as depicted in formula (Ia) wherein the bonding to said moiety is highlighted (as commonly done so in the art) by wavy lines (" ").
  • the aqueous electroless nickel plating bath comprises at least one aminopropanenitrile derivative chosen from any one of formulae (II) and (IV) to (VII) wherein R 1 and R 2 are independently from each other selected from the group consisting of hydrogen, alkyl, aryl, and alkaryl with the proviso that at least one of said residues is other than hydrogen; wherein n is an integer ranging from 4 to 7 and each X is independently from each other selected from the group consisting of -CH 2 -, -O-, -N(R 4 )- with each R 4 being independently from each other selected from the group consisting of hydrogen, alkyl, aryl, and alkaryl; wherein Y 1 is a C1-C8-alkylene group, R 5 and R 6 are independently from each other selected from the group consisting of hydrogen, alkyl, aryl, and alkaryl; and wherein each Y 2 and Y 3 are independently from each other selected to be C1-C8-alkylenes
  • aminopropanenitrile derivatives according formulae (II) and (IV) to (VII) improve the stability of the aqueous electroless nickel plating bath and compressive stress of the nickel or nickel alloy deposits formed with said aqueous electroless nickel plating bath (also compared to one aqueous electroless nickel plating bath containing only 3-aminopropanenitrile as stabiliser).
  • aminopropanenitrile derivatives according formulae (II) and (IV) to (VII) all comprise at least one moiety according to formula (Ia), bearing residues at the nitrogen atom of the amino group.
  • the amino group of the at least one aminopropanenitrile moiety (according to formula (Ia)) of the aminopropanenitrile derivatives is preferably not permanently quaternized. If more than one 3-aminopropanenitrile moiety is comprised in the aminopropanenitrile derivative, none of said amino groups is preferably permanently quaternized.
  • a permanently quarternised amino group bears four permanently attached residues other than hydrogen like e.g. alkyl, aryl or alkaryl.
  • R 1 is selected from the group consisting of non-cyclic, unfunctionalised alkyl and non-cyclic, functionalised alkyl wherein said functionalisation is one or more of hydroxyl and carboxyl and R 2 is selected from hydrogen, alkyl, aryl, and alkaryl.
  • the aminopropanenitrile derivative according to formula (V) comprises a ring-shaped moiety (including the nitrogen atom of the aminopropanenitrile moiety depicted by formula (Ia)) wherein n is an integer ranging from 4 to 7 (thus forming 5 to 8 membered rings), preferably n ranges from 4 to 5 (thus forming 5 to 6 membered rings), and each X are independently from each other selected from the group consisting of -CH 2 -, -O-, -N(R 4 )- with each R 4 being independently from each other selected from the group consisting of hydrogen, alkyl, aryl, and alkaryl.
  • At least half of X in the aminopropanenitriles derivative according to formula (V) are selected to be -CH 2 -.
  • the ring-shaped moiety is selected from the group consisting of 1 ⁇ 2 -pyrrolidine, 2 ⁇ 2 -pyrazolidine, 3 ⁇ 2 -imidazolidine, 2 ⁇ 2 -isoxazolidine, 3 ⁇ 2 -oxazolidine, 1 ⁇ 2 -piperidine, tetrahydro-1 H -2 ⁇ 2 -pyridazine, tetrahydro-2 H -3 ⁇ 2 -pyrimidine, 4 ⁇ 2 -piperazine, 1,2 ⁇ 2 -oxazinane, 1,3 ⁇ 2 -oxazinane, 4 ⁇ 2 -morpholine and derivatives thereof.
  • Y 1 in aminopropanenitriles derivative according to formula (VI) is an unfunctionalised, unbranched, non-cyclic C1-C6-alkylene rendering said aminopropanenitriles derivative more hydrophilic, more preferably an unfunctionalised, unbranched, non-cyclic C2-C4-alkylene.
  • At least one of residues R 5 and R 6 is selected to be different from hydrogen as this improves the stability of the aqueous electroless nickel plating bath, such that one of said residues is selected from the group consisting of alkyl, aryl, and alkaryl while the other residue is selected from the group consisting of hydrogen, alkyl, aryl, and alkaryl. More preferably, R 5 and/or R 6 are selected to be non-cyclic C1-C4-alkyl.
  • each bridging moiety Y 2 and Y 3 is independently from each other selected to be C1-C8-alkylenes, preferably C1-C6-alkylenes, more preferably C2-C4-alkylenes rendering molecules according to formula (VII) less hydrophobic with the advantages outlined below.
  • both bridging moieties Y 2 and Y 3 are selected to be the same for the ease of synthesis.
  • the aqueous electroless nickel plating bath according to the invention comprises more than one of said aminopropanenitrile derivatives. Also, two or more of said aminopropanenitrile derivatives of the same or different formulae may suitably be used.
  • the aqueous electroless nickel plating bath according to the invention comprises more preferably at least one aminopropanenitrile derivative according to any one of formulae (II) or (VII).
  • the aminopropanenitrile derivatives according to formulae (II) or (VII) show even more pronounced improvements of the stability of aqueous electroless nickel plating bath and the nickel or nickel alloy layers formed with an aqueous electroless nickel plating bath containing said aminopropanenitrile derivatives according to formulae (II) or (VII) show an enhanced compressive stress.
  • the aqueous electroless nickel plating bath according to the invention comprises at least one aminopropanenitrile derivative according to formula (VII).
  • the aqueous electroless nickel plating bath according to the invention comprises at least one aminopropanenitrile derivative according to formula (II) as said aminopropanenitrile derivatives enhance the plating bath's stability decisively (see Application Example 2).
  • aminopropanenitriles derivatives The preparation of the aminopropanenitriles derivatives is known in the art. Exemplarily but not limiting, they may be synthesized by a Michael type addition of suitable amines to acrylonitrile (see Preparation Examples).
  • the aminopropanenitriles derivatives may be used as received or purified prior to use. Useful purification methods include chromatography such as column chromatography, recrystallization and distillation depending on the physical properties of the individual aminopropanenitriles derivatives.
  • alkyl according to the present invention comprises branched or unbranched alkyl groups comprising cyclic and/or non-cyclic structural elements, wherein cyclic structural elements of the alkyl groups naturally require at least 3 carbon atoms.
  • C1-CX-alkyl group refers to alkyl groups having 1 to X carbon atoms. Unless stated otherwise, alkyl groups herein have 1 to 8 carbon atoms and are thus C1-C8-alkyl groups.
  • C1-C6 alkyl groups, more preferably C2-C4-alkyl groups are used in the context of the present invention for their reduced hydrophobicity.
  • C1-C8-alkyl for example includes, among others, methyl, ethyl, n -propyl, iso -propyl, n-butyl, iso-butyl, sec -butyl, tert-butyl, n -pentyl, iso pentyl, sec -pentyl, tert -pentyl, neo -pentyl, hexyl, heptyl and octyl.
  • Alkyl groups may be functionalised (also referred to as substituted) and are (theoretically) obtained by replacing at least one hydrogen by a functional group preferably selected from amino, hydroxyl, thiol, halides such as fluorine, chlorine, bromine, iodine, carbonyl, carboxyl, carboxylic acid esters, sulphonyl
  • this at least one functionalisation is selected from the group consisting of hydroxyl and carboxyl, as these groups improve the hydrophilicity of such functionalised molecules resulting in improved properties of formed nickel or nickel alloy layers, particularly in improved compressive stress of such deposited nickel or nickel alloy layers.
  • Alkylene are respective derivatives of alkyl having with two free bonding sites. They may be functionalised as described for alkyl using the same functional groups. They may be branched or unbranched.
  • C1-CX-alkylene refers to alkylene groups having 1 to X carbon atoms.
  • aryl refers to ring-shaped aromatic hydrocarbon residue, for example phenyl or naphtyl, where individual ring carbon atoms can be replaced by N, O and/or S, for example benzothiazolyl.
  • aryl residues can be functionalised by (theoretically) replacing a hydrogen in each case by a functional group, preferably selected from amino, hydroxyl, thiol, halides such as fluorine, chlorine, bromine, iodine, carbonyl, carboxyl, carboxylic acid esters, more preferably selected from the group consisting of hydroxyl and carboxyl for the same reasons outlined above.
  • aralkyl refers to a hydrocarbon residue consisting of at least one alkyl and at least one aryl group such as benzyl and tolyl.
  • the aminopropanenitrile derivatives can be used as stabilising agents in aqueous electroless nickel plating baths.
  • the aqueous electroless nickel plating bath according to the invention comprises the at least one aminopropanenitrile derivative in a total concentration of 1 to 10000 ⁇ mol/l, preferably in a total concentration of 50 to 5000 ⁇ mol/l.
  • Total concentration in this aspect means that if more than one of said compounds is comprised in the aqueous electroless nickel plating bath, the sum of concentrations of all aminopropanenitrile derivatives and aminopropanenitrile shall be in above-defined range. Concentration below said ranges may not be sufficient in order to stabilise the aqueous electroless nickel plating bath according to the invention. Concentration above said range may not allow for high enough plating rates.
  • the aqueous electroless nickel plating bath according to the invention is an aqueous solution.
  • aqueous solution means that the prevailing liquid medium, which is the solvent in the solution, is water. Further liquids, that are miscible with water, as for example alcohols and other polar organic liquids, that are miscible with water, may be added. It is preferred that at least 95 wt.-%, more preferably 99 wt.-%, of all solvents used is water because of its ecologically benign character.
  • the aqueous electroless nickel plating bath according to the invention may be prepared by dissolving all components in aqueous liquid medium, preferably in water.
  • the aqueous electroless nickel plating bath according to the invention comprises at least one source of nickel ions.
  • the at least one source of nickel ions can be provided by any water-soluble salt or any water-soluble nickel complex.
  • nickel ions are provided by any one of nickel sulphate, nickel chloride, nickel acetate, nickel methyl sulphonate, nickel sulphamate and mixtures thereof.
  • the concentration of the nickel ions in the aqueous electroless nickel plating bath may vary widely and preferably ranges from 0.01 mol/l to 1 mol/l, more preferably from 0.03 mol/l to 0.8 mol/l, even more preferably from 0.06 mol/l to 0.3 mol/l.
  • the aqueous electroless nickel plating bath according to the invention further comprises at least one reducing agent.
  • the at least one reducing agent is preferably a chemical reducing agent. Reducing agents provide the electrons needed to reduce metal ions to their metallic form and thereby form a metal deposit on a substrate.
  • the at least one reducing agent is suitable to reduce nickel ions.
  • the at least one reducing agent is selected from the group consisting of hypophosphite compounds such as hypophosphite salts or hypophosphorous acid, aminoboranes, borohydrides, hydrazine and derivatives thereof and formaldehyde.
  • the at least one reducing agent is more preferably a hypophosphite salt or hypophosphorous acid, even more preferably a hypophosphite salt.
  • the hypophosphite salt is supplied to the aqueous electroless nickel plating bath by any suitable source such as sodium, potassium, ammonium and nickel hypophosphite.
  • Two or more reducing agents may be employed as a mixture in the aqueous electroless nickel plating bath.
  • the concentration of the at least one reducing agent is generally in molar excess of the amount sufficient to reduce the nickel ions in the aqueous electroless nickel plating bath.
  • the concentration of the reducing agent preferably ranges from 0.01 mol/l to 3.0 mol/l, more preferably from 0.1 mol/l to 1 mol/l.
  • a hypophosphite compound is used as the reducing agent
  • a Ni-P alloy deposit is obtained.
  • Such reducing agents provide the source of phosphorous in the deposited alloy.
  • a borane-based compound as reducing agent leads to a Ni-B alloy deposit and a mixture of hypophosphite compounds and borane-based compounds as the reducing agents leads to a ternary Ni-B-P alloy deposit.
  • a nitrogen-based reducing agent such as hydrazine and derivatives thereof as well as formaldehyde as reducing agent provide nickel deposits.
  • the aqueous electroless nickel plating bath according to the invention may be acidic, neutral or alkaline.
  • An acidic or an alkaline pH adjustor may be selected from a wide range of materials such as ammonium hydroxide, sodium hydroxide, hydrochloric acid, sulfuric acid and the like.
  • the pH of the aqueous electroless nickel plating bath according to the invention may range from about 2 to 12.
  • the aqueous electroless nickel plating bath according to the invention is preferably acidic. More preferably, the pH of the acidic aqueous electroless nickel plating bath according to the invention ranges from 3.5 to 7, even more preferably from 3.5 to 6.5, most preferably from 3.5 to 5.5.
  • the aqueous electroless nickel plating bath according to the invention is preferably alkaline. More preferably, the pH of the alkaline aqueous electroless nickel plating bath according to the invention ranges from 7.5 to 12, even more preferably from 8 to 10, most preferably from 8 to 9.
  • the aqueous electroless nickel plating bath according to the invention further comprises at least one complexing agent.
  • a complexing agent (sometimes also referred to as chelating agent) or mixture of complexing agents is included in the aqueous electroless nickel plating bath.
  • a complexing agent keeps metal ions dissolved and prevents their undesired precipitation in solution.
  • the at least one complexing agent is preferably selected from complexing agents for nickel ions and optionally, complexing agents for alloying metal ions, more preferably from complexing agents for nickel ions.
  • the at least one complexing agent is preferably selected from the group consisting of alkyl amines, ammonia, carboxylic acids, hydroxylcarboxylic acids, aminocarboxylic acids, salts of the aforementioned and mixtures thereof.
  • carboxylic acids, hydroxylcarboxylic acids, aminocarboxylic acids and salts of the aforementioned or mixtures thereof may be employed as the at least one complexing agent.
  • Useful carboxylic acids include the mono-, di-, tri- and tetra-carboxylic acids.
  • the carboxylic acids may be substituted with various substituent moieties such as hydroxyl or amino groups and the acids may be introduced into the aqueous electroless nickel plating bath as their sodium, potassium or ammonium salts.
  • Some complexing agents such as acetic acid, for example, may also act as a pH buffering agent, and the appropriate concentration of such additive components can be optimised for any aqueous electroless nickel plating bath in consideration of their dual functionality.
  • Preferred carboxylic acids are acetic acid, aminoacetic acid, propanoic acid, 2-hydroxyl propanoic acid, succinic acid, hydroxyl succinic acid, adipic acid or 2-hydroxyl-1,2,3-propane-tricarboxylic acid.
  • mixtures of two or more of the above complexing agents are utilised in the aqueous electroless nickel plating bath according to the invention.
  • Alkyl amines may also be used as the at least one complexing agent, for example mono-, di- and trialkylamines. (Functionalised) C1-C3-alkyl amines, for example triethanol-amine are preferred. Ammonia may also be used as the at least one complexing agent.
  • the concentration of the at least one complexing agent or, in case more than one complexing agent is used, the concentration of all complexing agents in total preferably ranges from 0.01 mol/l to 3.0 mol/l, more preferably from 0.1 mol/l to 1.0 mol/l and even more preferably from 0.2 mol/l to 0.6 mol/l.
  • the aqueous electroless nickel plating bath according to the invention optionally comprises at least one further stabilising agent.
  • Such optional stabilising agent may further improve the bath lifetime, a reasonable plating rate and to control the phosphorous content in the as deposited nickel phosphorous alloy. Since the aminopropanenitrile derivatives act as stabilising agents, a further stabilising agent is not necessary.
  • Suitable optional stabilising agents are, without limitation, heavy metal ions such cadmium, thallium, bismuth, lead and antimony ions, iodine containing compounds such as iodide and iodate, sulphur containing compounds such as thiocyanate, thiourea and mercaptoalkanesulphonic acids like 3-mercaptopropanesulphonic acid or the respective disulphides derived therefrom as disclosed in WO 2013/013941 and unsaturated organic acids such as maleic acid and itaconic acid or suitably substituted alkynes as those taught by EP 2 671 969 A1 .
  • heavy metal ions such cadmium, thallium, bismuth, lead and antimony ions
  • iodine containing compounds such as iodide and iodate
  • sulphur containing compounds such as thiocyanate, thiourea and mercaptoalkanesulphonic acids like 3-mercaptopropanesulphonic acid
  • stabilising agents such as bismuth ions and mercaptobenzoic acids, mercaptocarboxylic acids and/or mercaptosulphonic acids as taught by WO 2013/113810 .
  • the concentration of the at least one optional stabilising agent in the inventive electroless nickel plating bath ranges from 0.1 to 100 mg/l, preferably from 0.5 to 30 mg/l.
  • aqueous electroless nickel plating bath may include pH buffers, wetting agents, accelerators, brighteners, additional stabilising agents, plating rate modifiers such as those disclosed in European patent application no. 14198380.9 , etc.
  • the aqueous electroless nickel plating bath according to the invention optionally contains further metal stabilising agents such as copper, selenium, tin, bismuth, antimony ions.
  • the concentration of the metal ions can vary and e.g. range from 0.1 to 100 mg/l, preferably from 0.1 to 50 mg/l, more preferably from 0.1 to 10 mg/l.
  • the aqueous electroless nickel plating bath according to the invention does not contain toxic heavy metals.
  • the aqueous electroless nickel plating bath according to the invention does preferably not contain lead, cadmium, antimony, bismuth, arsenic or mercury (disregarding trace residues commonly present in technical raw materials which are herein defined to be 0.1 mg/l or less).
  • a hypophosphite compound is used as the reducing agent for nickel, nickel and phosphorous containing alloy deposits are obtained.
  • the amount of phosphorous in said alloy deposit depends inter alia on the concentration of hypophosphite and nickel ions in the inventive aqueous electroless nickel plating bath and the optional stabilising agent.
  • the aqueous electroless nickel plating bath according to the invention and the method of the present invention are suitable to provide nickel phosphorous alloy coatings with a wide range of P content of between 1 to 15 wt.-% P.
  • the amount of phosphorous in said alloy deposit ranges from 5 to 15 wt.-% with the balance being nickel, more preferred it ranges from 10.5 to 15 wt.-% with the balance being nickel as these so-called high-phosphorous (high NiP) coatings are paramagnetic.
  • boron-based reducing agent used as the reducing agent for nickel
  • nickel and boron containing alloy deposits are obtained.
  • the amount of boron in said alloy deposit depends inter alia on the concentration of boron-based reducing agent and nickel ions in the inventive aqueous electroless nickel plating bath and the optional stabilising agent.
  • the amount of boron in said alloy deposit ranges from 1 to 20 wt.-% with the balance being nickel.
  • one or more of hydrazine or formaldehyde are used as the reducing agents for nickel, pure nickel deposits are obtained.
  • the aqueous electroless nickel plating bath according to the invention optionally further comprises at least one alloying element.
  • nickel alloy layers containing the alloying element are deposited from the aqueous electroless nickel plating bath according to the invention.
  • the at least one alloying element may be selected from phosphorus, boron, and a further source of metal ions which is not a source of nickel ions.
  • the alloying elements phosphorus or boron may be comprised in the aqueous electroless nickel plating bath in the form of a hypophosphite salt, hypophosphorous acid or a borane-based compound, such as aminoboranes or borohydrides, as mentioned above as reducing agents.
  • the at least one source of metal ions which is not a source of nickel ions may be comprised in the aqueous electroless nickel plating bath in the form of a water-soluble metal salt containing the ions of the alloying metal M.
  • the optional at least one alloying metal M is preferably selected from the group consisting titanium, vanadium, chromium, manganese, zirconium, niobium, molybdenum, hafnium, tantalum, tungsten, copper, silver, gold, aluminium, iron, cobalt, palladium, ruthenium, rhodium, osmium, iridium, platinum, zinc, gallium, indium, tin, and thallium. More preferably, the optional alloying metal M is selected from the group consisting of molybdenum, tungsten, copper, silver, gold, aluminium, zinc and tin.
  • the concentration of the optional at least one alloying metal M preferably ranges from 10 -5 to 0.2 mol/l, more preferably from 10 -4 to 0.2 mol/l, even more preferably from 10 -2 to 0.1 mol/l.
  • the respective nickel alloy is obtained as deposit.
  • an alloying metal M to the aqueous electroless nickel plating bath (depending on the kind of reducing agent present) ternary or quaternary alloys Ni-M-P, Ni-M-B, and Ni-M-B-P are deposited.
  • a water-soluble salt of an alloying metal M and a water-soluble salt of a second alloying metal M* are added to the aqueous electroless nickel plating bath according to the invention.
  • nickel alloy deposits comprising alloying metals M and M* are obtained.
  • the present invention further relates to a method for electroless deposition of nickel and nickel alloys by contacting the substrate to be plated with the above described aqueous electroless nickel plating bath.
  • the deposition method comprises the steps of
  • the substrate to be nickel or nickel alloy plated may be plated to the desired thickness and deposit quantity by contacting the substrate with the aqueous electroless nickel plating bath according to the invention.
  • the inventive aqueous electroless nickel plating bath may be maintained over a temperature range of 20°C to 100°C, preferably 70°C to 95 °C, more preferably 85°C to 90 °C or 95°C during deposition.
  • a deposit thickness of up to 100 ⁇ m, or higher may be employed.
  • the thickness of the nickel or nickel phosphorus (NiP) deposits varies between 1 - 60 ⁇ m. The thickness depends on the technical application and can be higher or lower for some applications. For example, if the nickel or NiP layer is deposited to provide a corrosion resistant coating, a thickness of between 30 - 60 ⁇ m is desired, while for electronics applications a thickness of between 1 - 15 ⁇ m is applied.
  • the thickness of the nickel or nickel-phosphorus deposits preferably ranges from 9 to 13 ⁇ m.
  • the thickness of the nickel or nickel-phosphorus deposits preferably ranges from 1 to 5 ⁇ m. Thicknesses of nickel or nickel alloy layers may be measured with x-ray fluorescence (XRF) which is known in the art.
  • XRF x-ray fluorescence
  • the aqueous electroless nickel plating bath for electroless deposition of nickel and nickel alloys and the methods of the present invention are suitable to provide nickel and nickel alloy coatings having an attractive bright or semi-bright appearance.
  • the aminopropanenitrile derivatives of the present invention do not shift the internal stress to neutral or tensile stress. To the contrary, the aminopropanenitrile derivatives of the present invention shift the stress to higher compressive stress values which is advantageous (see e.g. Application Example 1).
  • the advantages of nickel or nickel alloy layers having compressive stress are high corrosion resistance and good adhesion to the substrate surface.
  • aminopropanenitrile derivatives according to the present invention does not change the phosphorous content of the deposited nickel alloy layers compared (significantly) to electroless nickel-phosphorus baths containing no such additive.
  • the use of aminopropanenitrile derivatives according to the present invention has no negative effect on the bath performance and no negative effect on the coating quality.
  • the stability of aqueous electroless nickel plating baths comprising the inventive aminopropanenitrile derivatives improve is significantly enhanced (see Application Example 2).
  • the phosphorus content of nickel alloy layers and the thickness of nickel or nickel alloy layers were measured by x-ray fluorescence (XRF) which is well known to persons skilled in the art.
  • XRF x-ray fluorescence
  • the XRF measurements make use of the characteristic fluorescence radiation emitted from a sample (substrate, deposit) being excited with x-rays.
  • phosphorus content and layer thicknesses can be calculated.
  • High NiP alloys obtained by the aqueous electroless nickel plating bath according to the present invention contribute to generating alloys having high compressive stress.
  • the stress values for example range between 0 to -70 N/mm 2 , preferably between 0 to -50 N/mm 2 , more preferably between - 30 to -50 N/mm 2 .
  • Such deposits show high corrosion resistance and excellent adhesion to the underlying substrate they are plated on.
  • substrates can be metal plated with the aqueous electroless nickel plating bath according to the invention and the method according to the invention.
  • the substrates to be metal plated are preferably selected from the group consisting of electrical non-conductive substrates, electrical conductive substrates, and electrical semi-conductive substrates.
  • the electrical non-conductive substrates to be metal plated can be selected from the group consisting of glass, ceramics, and plastics. Electrical nonconductive substrates may have to be made receptive for the deposition of nickel or nickel alloys. This is referred to as activation in the art. The activation can be accomplished for example by depositing a catalytic layer of palladium or another noble metal on said substrate which renders in nonconductive substrate suitable for nickel or nickel alloy deposition.
  • Plastics can be selected from acrylnitrile-butadiene-styrol-copolymer (ABS copolymer); polyamide; a mixture of an ABS copolymer and at least one other polymer which is different to the ABS copolymer; polycarbonate (PC); ABS/PC blends; epoxy resin; bismaleimide-triazine resin (BT); cyanate ester resin; polyimide; polyethylene terephthalate (PET); polybutylene terephthalate (PBT); polylactic acid (PLA); polypropylene (PP); and polyester.
  • ABS copolymer acrylnitrile-butadiene-styrol-copolymer
  • PC polycarbonate
  • ABS/PC blends ABS/PC blends
  • epoxy resin bismaleimide-triazine resin
  • BT bismaleimide-triazine resin
  • PBT polycyanate ester resin
  • polyimide polyethylene terephthalate
  • PET polybutylene terephthalate
  • the electrical conductive substrates to be metal plated can be selected from metallic substrates, and conductive metal oxides.
  • the metallic substrates to be metal plated are preferably selected from the group consisting of copper, zinc, silver, gold, platinum, palladium, iron, iridium, tin, aluminium and nickel.
  • the conductive metal oxides to be metal plated can be selected from indium tin oxide (ITO), antimony tin oxide (ATO), aluminium doped zinc oxide (AZO), fluorine doped tin oxide, magnesium doped zinc oxide, and chromium doped titanium oxide; preferably, they are selected from indium tin oxide, antimony tin oxide and aluminium doped zinc oxide.
  • ITO indium tin oxide
  • ATO antimony tin oxide
  • AZO aluminium doped zinc oxide
  • fluorine doped tin oxide magnesium doped zinc oxide
  • chromium doped titanium oxide preferably, they are selected from indium tin oxide, antimony tin oxide and aluminium doped zinc oxide.
  • the electrical semi-conductive substrates to be metal plated can be selected from the group consisting of silicon, germanium, gallium, arsenic, silicon nitride and silicon carbide.
  • the substrates are typically used in the electronics industry, for example for the manufacturing of printed circuit boards, IC substrates, semiconductor wafers, chip carriers, touch screens and so forth.
  • Substrates are optionally pretreated prior to step (ii). Such pretreatment is known in the art. Typical pretreatments include etching, cleaning and activation steps. Useful pretreatments may improve the plating results by removing undesired dirt or oxides from the surface of the substrate. Pretreatments may vary widely depending on the substrate provided. Some guidance can exemplarily be found in WO2015/161959 A1 (page 13, line 11 to page 15, line 30).
  • the method according to the invention optionally comprises rinsing steps, preferably with water, and/or drying steps.
  • the phosphorus content and deposit thickness were measured at 5 points of each substrate by XRF using the XRF instrument Fischerscope XDV-SDD (Helmut Fischer GmbH, Germany). By assuming a layered structure of the deposit the layer thickness can be calculated from such XRF data. The plating rate was calculated by dividing the obtained layer thickness by the time necessary to obtain said layer thickness.
  • U is the number of increments spread
  • T is the deposit thickness
  • K is the strip calibration constant.
  • Each lot of test strips manufactured will respond with slight differences when used for deposit stress test. This degree of difference was determined by the supplier when each lot of test strips was calibrated. The value for K was supplied with each lot of test strips provided by Specialty Testing & Development Co. Stress was also determined to be of compressive or tensile nature. If the test strip legs were spread outward on the side that has been plated, the deposit stress was tensile in nature. If the test strip legs were spread inward on the side that has been plated, the deposit stress was compressive in nature.
  • a 100 ml reaction flask equipped with thermometer and magnetic stirring bar was charged with piperazine (10.0 g, 116 mmol) in 60 mL water.
  • the solution was adjusted to 25°C and acrylonitrile (18.5 g, 348 mmol) was added.
  • the reaction mixture was stirred overnight and the reaction was monitored by thin layer chromatography. After 15 hours of total reaction time, the volatile compounds of the reaction mixture were removed under reduced pressure. Then, the remaining residue was extracted three times with 100 mL ethyl acetate and the combined organic phases were dried over magnesium sulphate.
  • Substrates as described above were used for deposition of nickel-phosphorus alloy layers.
  • the substrates were immersed in aqueous electroless nickel plating bath comprising the following components: NiSO 4 ⁇ 6 H 2 O 0.1 mol/l succinic acid 0.055 mol/l malic acid 0.1 mol/l lactic acid 0.1 mol/l sodium hypophosphite monohydrate 0.3 mol/l
  • the aqueous electroless nickel plating bath further comprised additives as given in Table II.
  • the pH value of the aqueous electroless nickel plating bath was 4.8.
  • Deposition was carried out in 1I-beakers. Each beaker was placed on a heater and temperature was maintained at 89.0 °C. Agitation was done by air injection. Bath loading was 0.9 dm 2 /l corresponding to one steel panel per bath volume. Deposition time was 120 min.
  • Application Example 1a (comparative example) contained no further additives.
  • Application Example 1b (according to the present invention) comprised an aminopropanenitrile according to formula (II) wherein R 1 was selected to be methyl (-CH 3 ) and R 2 was -CH 2 -CO 2 H.
  • Application Example 1c and 1d (not according to the present invention) comprised an aminopropanenitrile according to formula (III) wherein R 3 was selected to be 2-hydroxyleth-1-yl (-CH 2 -CH 2 -OH).
  • Application Example 1e and 1f comprised aminopropanenitriles according to formula (V) with n equalling 4 and all X were to be -CH 2 - wherein one carbon atom (in ⁇ -position to the nitrogen atom of the aminopropanenitrile moiety) bore a carboxyl moiety.
  • Application Example 1g and 1h comprised aminopropanenitriles according to formula (V) with n equalling 4 and all X were selected to be -CH 2 - wherein one carbon atom (in ⁇ -position to the nitrogen atom of the aminopropanenitrile moiety) bore a carboxyl moiety and another carbon atom bore an additional hydroxyl moiety (in ⁇ -position of both the nitrogen atom of the aminopropanenitrile moiety and the carboxyl moiety bearing carbon atom).
  • Application Example 1i and 1j comprised an aminopropanenitrile according to formula (VI) wherein Y 1 was selected to be ethylene (-CH 2 -CH 2 -) and R 5 as well as R 6 were both selected to be methyl (-CH 3 ).
  • Application Example 1k and 1l comprised an aminopropanenitrile according to formula (VII) wherein both Y 2 and Y 3 were selected to be ethylene (-CH 2 -CH 2 -).
  • Table II Plating results.
  • the deposited nickel-phosphorus alloy layers of the inventive examples completely covered the substrate surface; no skip plating was obtained contrary to the comparative example which showed substantial skip plating.
  • the deposited nickel phosphorous alloy layers were of uniform thickness, adhered well to the substrate surface and had a good appearance with technical brightness and a typical grey colour.
  • the plating rate of all inventive examples was decreased compared to the comparative example. Also, the stress of the nickel phosphorous alloy layers formed from the inventive examples was more compressive compared to the nickel phosphorus alloy layers obtained from the comparative examples.
  • a further advantage of the inventive examples was that no nickel phosphorous alloy was deposited on surfaces of the beaker or other surfaces than the substrate surface.
  • Aqueous electroless nickel plating baths comprising the following components were used to plate onto Q panels and onto test strips and the stability was monitored over time. The plating was run in a 1 L beaker at 88°C; the pH of the aqueous electroless nickel plating bath was 4.8. NiSO 4 ⁇ 6 H 2 O 0.1 mol/l complexing agent 0.255 mol/l sodium hypophosphite monohydrate 0.3 mol/l
  • the comparative plating bath comprising no additives other than those described above should little stability and started to deteriorate directly after the beginning of the plating. Plate-out was complete after two minutes.
  • inventive examples 2b and 2c enhanced the stability of the plating bath significantly. Both aminopropanenitrile derivatives improved the time until plate-out of the aqueous electroless nickel plating bath by factor 2.5.

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Claims (13)

  1. Wässriges stromloses Nickelplattierungsbad, umfassend mindestens eine Quelle für Nickelionen und mindestens ein Reduktionsmittel, das geeignet ist, um Nickelionen zu reduzieren, dadurch gekennzeichnet, dass es mindestens ein Aminopropannitrilderivat gemäß einer der Formeln (II) und (IV) bis (VII) umfasst:
    Figure imgb0028
     wobei R1 und R2 unabhängig voneinander ausgewählt sind aus der Gruppe bestehend aus Wasserstoff, Alkyl, Aryl und Alkaryl mit der Maßgabe, dass mindestens einer der Reste von Wasserstoff verschieden ist;
    Figure imgb0029
    Figure imgb0030
     wobei n eine ganze Zahl im Bereich von 4 bis 7 ist, und jedes X unabhängig von einander ausgewählt ist aus der Gruppe bestehend aus -CH2-, -O-, -N(R4)-, wobei jedes R4 unabhängig voneinander ausgewählt ist aus der Gruppe bestehend aus Wasserstoff, Alkyl, Aryl und Alkaryl;
    Figure imgb0031
     wobei Y1 eine C1-C8-Alkylengruppe ist, R5 und R6 unabhängig voneinander ausgewählt sind aus der Gruppe bestehend aus Wasserstoff, Alkyl, Aryl und Alkaryl; und
    Figure imgb0032
     wobei jedes Y2 und Y3 unabhängig voneinander so gewählt wird, dass es C1-C8-Alkylene sind.
  2. Wässriges stromloses Nickelplattierungsbad nach Anspruch 1, dadurch gekennzeichnet, dass es mindestens ein Aminopropannitrilderivat gemäß einer der Formeln (II) oder (VII) umfasst.
  3. Wässriges stromloses Nickelplattierungsbad nach Anspruch 2, dadurch gekennzeichnet, dass es mindestens ein Aminopropannitrilderivat gemäß Formel (II) umfasst.
  4. Wässriges stromloses Nickelplattierungsbad nach Anspruch 3, dadurch gekennzeichnet, dass R1 ausgewählt ist aus der Gruppe bestehend aus nichtcyclischem unfunktionalisiertem Alkyl und nichtcyclischem funktionalisiertem Alkyl, wobei die Funktionalisierung eine oder mehrere von Hydroxyl und Carboxyl ist.
  5. Wässriges stromloses Nickelplattierungsbad nach Anspruch 2, dadurch gekennzeichnet, dass es mindestens ein Aminopropannitrilderivat gemäß Formel (VII) umfasst.
  6. Wässriges stromloses Nickelplattierungsbad nach Anspruch 5, dadurch gekennzeichnet, dass es mindestens ein Aminopropannitrilderivat gemäß Formel (VII) umfasst und beide Brückenanteile Y2 und Y3 so gewählt sind, dass sie C2-C4-Alkylene sind, und so gewählt sind, dass sie die gleichen sind.
  7. Wässriges stromloses Nickelplattierungsbad nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Aminogruppe des mindestens einen Aminopropannitrilanteils der Aminopropannitrilderivate nicht permanent quaternisiert ist.
  8. Wässriges stromloses Nickelplattierungsbad nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es das mindestens eine Aminopropannitrilderivat in einer Gesamtkonzentration von 1 bis 10000 µmol/l umfasst.
  9. Wässriges stromloses Nickelplattierungsbad nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es mindestens ein Komplexierungsmittel für Nickelionen umfasst.
  10. Wässriges stromloses Nickelplattierungsbad nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es nicht Blei, Cadmium, Antimon, Bismut, Arsen oder Quecksilber enthält.
  11. Wässriges stromloses Nickelplattierungsbad nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es mindestens eine weitere Quelle für Metallionen ausgewählt aus der Gruppe bestehend aus Titan, Vanadium, Chrom, Mangan, Zirconium, Niob, Molybdän, Hafnium, Tantal, Wolfram, Kupfer, Silber, Gold, Aluminium, Eisen, Kobalt, Palladium, Ruthenium, Rhodium, Osmium, Iridium, Platin, Zink, Gallium, Indium, Zinn und Thallium umfasst.
  12. Verfahren zur stromlosen Abscheidung von Nickel und Nickellegierungen, umfassend die Schritte:
    (A) Bereitstellen eines Substrats;
    (B) Kontaktieren des Substrats mit dem wässrigen stromlosen Nickelplattierungsbad gemäß einem der Ansprüche 1 bis 11,
    und dadurch Abscheiden von Nickel oder Nickellegierung auf dem Substrat.
  13. Verfahren zum stromlosen Abscheiden von Nickel und Nickellegierungen nach Anspruch 12, dadurch gekennzeichnet, dass die Substrate ausgewählt sind aus der Gruppe bestehend aus elektrisch nicht leitenden Substraten, elektrisch leitenden Substraten und elektrisch halbleitenden Substraten.
EP16150307.3A 2016-01-06 2016-01-06 Stromlose nickelplattierungsbäder mit aminonitrilen und verfahren zur abscheidung von nickel und nickellegierungen Active EP3190208B1 (de)

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PCT/EP2017/050132 WO2017118655A1 (en) 2016-01-06 2017-01-04 Electroless nickel plating baths comprising aminonitriles and a method for deposition of nickel and nickel alloys

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CN109148950B (zh) * 2017-06-15 2020-10-02 宁德时代新能源科技股份有限公司 一种电解液及电池
EP3743541A1 (de) * 2018-01-25 2020-12-02 Université de Mons Nickellegierungsbeschichtung
LU100682B1 (en) * 2018-01-25 2019-08-21 Univ Mons Nickel alloy coating
CN114678592B (zh) * 2022-05-30 2022-09-13 深圳澳睿新能源科技有限公司 含氰基环状胺化合物的非水电解液、锂离子电池及其应用

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