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EP1350866A1 - A coating solution for metals and metal alloys - Google Patents

A coating solution for metals and metal alloys Download PDF

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Publication number
EP1350866A1
EP1350866A1 EP02007662A EP02007662A EP1350866A1 EP 1350866 A1 EP1350866 A1 EP 1350866A1 EP 02007662 A EP02007662 A EP 02007662A EP 02007662 A EP02007662 A EP 02007662A EP 1350866 A1 EP1350866 A1 EP 1350866A1
Authority
EP
European Patent Office
Prior art keywords
coating solution
solution according
blank
metal
dithiocarbamate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02007662A
Other languages
German (de)
French (fr)
Inventor
Walter Zepf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP02007662A priority Critical patent/EP1350866A1/en
Priority to DE60306569T priority patent/DE60306569T2/en
Priority to AT03007463T priority patent/ATE332399T1/en
Priority to EP03007463A priority patent/EP1350867B1/en
Publication of EP1350866A1 publication Critical patent/EP1350866A1/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M173/00—Lubricating compositions containing more than 10% water
    • C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/56—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing nitrogen
    • C10M105/68—Amides; Imides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
    • C10M111/02—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a non-macromolecular organic compound
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/23—Condensed phosphates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/04—Elements
    • C10M2201/041—Carbon; Graphite; Carbon black
    • C10M2201/0413—Carbon; Graphite; Carbon black used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/065—Sulfides; Selenides; Tellurides
    • C10M2201/066—Molybdenum sulfide
    • C10M2201/0663—Molybdenum sulfide used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/085—Phosphorus oxides, acids or salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/085—Phosphorus oxides, acids or salts
    • C10M2201/0853—Phosphorus oxides, acids or salts used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/10—Compounds containing silicon
    • C10M2201/105—Silica
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/14—Synthetic waxes, e.g. polythene waxes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/16—Paraffin waxes; Petrolatum, e.g. slack wax
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/18—Natural waxes, e.g. ceresin, ozocerite, bees wax, carnauba; Degras
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/12—Polysaccharides, e.g. cellulose, biopolymers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
    • C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/06—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having phosphorus-to-carbon bonds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/02—Groups 1 or 11
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/12—Groups 6 or 16
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/24—Metal working without essential removal of material, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/243—Cold working
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/015—Dispersions of solid lubricants
    • C10N2050/02—Dispersions of solid lubricants dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating

Definitions

  • the present invention relates to a coating solution to be applied onto the surface of metals or metal alloys, a process for cold forming of metals and metal alloys using said coating solution, and a coated blank made of a metal or a metal alloy.
  • lubricant carriers are applied onto the surface of the workpiece, which can absorb about five times the quantity of lubricants compared to the untreated metal surface.
  • the application of such lubricant carriers onto the surface of workpieces is carried out by applying aggressive acids and metallic soaps in huge amounts, which is not desirable from an ecological standpoint.
  • the technical problem underlying the present invention is to provide a new system for cold forming of metals and metal alloys, which should avoid the treatment of the working piece with aggressive acids and/or metallic soaps prior to the cold forming process, but should exhibit at least the same results compared to a cold forming process using workpieces treated with aggressive acids and/or metallic soaps.
  • a coating solution to be applied on to the surface of a metal or a metal alloy comprising a polyphosphate and a dithiocarbamate.
  • the coating solution of the present invention can further include graphite and/or molybdenum disulfide, each of which can be present preferably in an amount of from about 0.1% (w/v) to about 80% (w/v).
  • the coating solution has a pH-value ranging from about 3 to about 4, adjusted by the above-defined pH-modulating agent.
  • the solvent used for the coating solution of the present invention is H 2 O in an amount of from 0% to 100% (v/v), alcohols, preferably alcohols having up to 10 carbon atoms such as methanol, ethanol, etc., or a mixture of different alcohols, in an amount of from 0% to 100% (v/v), or a H 2 O/alcohol-mixture in an amount of from 0% to 100% (v/v).
  • the blank can be sand-blasted prior to the above process step (a).
  • a blank made of a metal or a metal alloy such as steel having a coating obtainable by the above-defined process steps (a) and (b).
  • the coating solution of the present invention does not exhibit the severe drawbacks with respect to environmental pollution, and on the other hand the blanks having a coating based on the coating solution of the present invention show at least the same results for the processed workpiece and the tool when compared with blanks having a coating known in the prior art. Moreover, the cold forming process using blanks treated with the coating solution of the present invention is superior from an economical standpoint.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Lubricants (AREA)
  • Laminated Bodies (AREA)
  • Chemically Coating (AREA)

Abstract

The present invention relates to a coating solution to be applied on the surface of metals or metal alloys, a process for cold forming of metals and metal alloys using said coating solution, and a coated blank made of a metal or a metal alloy.

Description

  • The present invention relates to a coating solution to be applied onto the surface of metals or metal alloys, a process for cold forming of metals and metal alloys using said coating solution, and a coated blank made of a metal or a metal alloy.
  • In cold forming, no heat is applied to the metallic workpiece before forming. However, its temperature can increase during the forming process, as the energy expanded in forming is almost completely converted into heat. The main advantages of cold forming are the saving of materials and working time, the use of lower strength steels, the improved quality of workpieces, lower machine costs, better size accuracy, high surface quality and an extended tool life. In order to achieve these advantages, a protective film must be formed between the tool and the work piece, which must remain intact during the working process. Such a protective film is mainly made up of molybdenum disulfide dispersions or graphite as lubricants. Hitherto, in order to obtain such a protective lubricating film in cold forming processes, lubricant carriers are applied onto the surface of the workpiece, which can absorb about five times the quantity of lubricants compared to the untreated metal surface. However, the application of such lubricant carriers onto the surface of workpieces is carried out by applying aggressive acids and metallic soaps in huge amounts, which is not desirable from an ecological standpoint.
  • Therefore, the technical problem underlying the present invention is to provide a new system for cold forming of metals and metal alloys, which should avoid the treatment of the working piece with aggressive acids and/or metallic soaps prior to the cold forming process, but should exhibit at least the same results compared to a cold forming process using workpieces treated with aggressive acids and/or metallic soaps.
  • The solution to the above technical problem is achieved by providing the embodiments characterized in the claims.
  • In particular, there is provided a coating solution to be applied on to the surface of a metal or a metal alloy, comprising a polyphosphate and a dithiocarbamate.
  • In a preferred embodiment of the present invention, the polyphosphate is selected from the group consisting of ammonium polyphosphate and alkali metal polyphosphates, such as sodium polyphosphate, or mixtures thereof. The amount of said polyphosphate is preferably in the range of from about 0.1% (w/v) to about 80% (w/v).
  • The dithiocarbamate is preferably a dialkyl dithiocarbamate, wherein the alkyl groups are the same or different and can have 1 to 12 carbon atoms. In a preferred embodiment of the present invention the dithiocarbamate is a heavy metal dithiocarbamate, wherein the heavy metal is for example molybdenum. In a more preferred embodiment of the present invention the dithiocarbamate is a molybdenum dibutyldithiocarbamate. The amount of said dithiocarbamate is preferably in the range of from about 0.1% (w/v) to about 80% (w/v).
  • The coating solution of the present invention can further include graphite and/or molybdenum disulfide, each of which can be present preferably in an amount of from about 0.1% (w/v) to about 80% (w/v).
  • In a preferred embodiment of the present invention the coating solution may further contain at least one component selected from the group consisting of alcohols in an amount of from 0 % to about 100% (v/v); waxes such as polyalkylene waxes, e.g. polyethylene waxes, microcrystalline waxes, and Montan ester® waxes, in an amount of from 0 % to about 80 (v/v); emulsifying agents such as alkyloxyethylates and alkylaryloxyethylates, in an amount of from 0 % to about 50% (v/v); pH-modulating agents such as buffers, e.g. phosphorous acid and esters thereof, in an amount of from 0 % to about 50% (v/v); polymeric compounds such as polyethylene glycols, preferably having a weight average molecular weight of from 500 to 1,000,000, polysaccharides and methylcellulose, in an amount of from 0% to about 50% (v/v); oxides such as silicon dioxide, in an amount of from 0% to about 50% (v/v); friction-reducing agents such as sodium stearate, in an amount of from 0% to about 80% (v/v); defoaming agents such as fatty alcohol polyglycol ethers, in an amount of from 0% to about 50% (v/v); carboxylic acids and derivatives thereof such as 2-phosphonobutanetricarboxylic acid, in an amount of from 0% to about 50% (v/v); organophosphorous compounds such as alkylphosphates, in an amount of from 0% to about 5% (v/v); and phosphates such as boron phosphate, sodium phosphate, P2O5 etc., in an amount of from 0% to about 80% (v/v); and mixtures thereof containing two or more of said components.
  • In a preferred embodiment of the present invention, the coating solution has a pH-value ranging from about 3 to about 4, adjusted by the above-defined pH-modulating agent.
  • The solvent used for the coating solution of the present invention is H2O in an amount of from 0% to 100% (v/v), alcohols, preferably alcohols having up to 10 carbon atoms such as methanol, ethanol, etc., or a mixture of different alcohols, in an amount of from 0% to 100% (v/v), or a H2O/alcohol-mixture in an amount of from 0% to 100% (v/v).
  • Further, the present invention relates to a process for cold forming of metals or metal alloys, comprising the steps of:
  • (a) immersing a blank of a metal or a metal alloy in a bath containing the above-defined coating solution for a time period of from about 30 seconds to about 10 minutes;
  • (b) drying said blank having the coating solution on its surface at a temperature ranging from about room temperature to about 80°C, preferably from about 50°C to about 60°C, wherein the drying is carried out preferably in hot air or in a drying stove; and
  • (c) subjecting the thus-coated blank to cold forming.
  • In the preferred embodiment, the blank can be sand-blasted prior to the above process step (a).
  • Further, there is provided a blank made of a metal or a metal alloy such as steel, having a coating obtainable by the above-defined process steps (a) and (b).
  • When using the above-defined coating solution for the treatment of blanks ("workpieces") to be processed in cold forming, there can be observed that on the one hand the coating solution of the present invention does not exhibit the severe drawbacks with respect to environmental pollution, and on the other hand the blanks having a coating based on the coating solution of the present invention show at least the same results for the processed workpiece and the tool when compared with blanks having a coating known in the prior art. Moreover, the cold forming process using blanks treated with the coating solution of the present invention is superior from an economical standpoint.

Claims (12)

  1. A coating solution to be applied on the surface of metals or metal alloys, comprising a polyphosphate and a dithiocarbamate.
  2. The coating solution according to claim 1, wherein said polyphosphate is selected from the group consisting of ammonium polyphosphate and alkali metal polyphosphates, or a mixture thereof.
  3. The coating solution according to claim 1 of 2, wherein the amount of said polyphosphate is in the range of from about 0.1% (w/v) to about 80% (w/v).
  4. The coating solution according to any one of claims 1 to 3, wherein said dithiocarbamate is a dialkyl dithiocarbamate.
  5. The coating solution according to claim 4, wherein said dithiocarbamate is a heavy metal dithiocarbamate.
  6. The coating solution according to any one of claims 1 to 5, wherein the amount of said dithiocarbamate is in the range of from about 0.1% (w/v) to about 80% (w/v).
  7. The coating solution according to any one of claims 1 to 6, further comprising at least one component selected from the group consisting of graphite and molybdenum disulfide, or a mixture thereof.
  8. The coating solution according to any one of claims 1 to 7, further comprising at least one component selected from the group consisting of alcohols, waxes, emulsifying agents, pH-modulating agents, polymeric compounds, oxides, friction-reducing agents, defoaming agents, carboxylic acids and derivatives thereof, organophosphorous compounds, and phosphates, or mixtures thereof containing two or more of said components.
  9. The coating solution according to any one of claims 1 to 8, having a pH-value ranging from about 3 to about 4.
  10. A process for cold forming of metals or metal alloys, comprising the steps of:
    (a) immersing a blank of a metal or a metal alloy in a bath containing a coating solution according to any one of claims 1 to 9, for a time period of from about 30 seconds to about 10 minutes;
    (b) drying said blank having the coating solution on its surface at a temperature ranging from about room temperature to about 80°C; and
    (c) subjecting the thus-coated blank to cold forming.
  11. The process according to claim 10, wherein prior to step (a) the blank is sand-blasted.
  12. A blank having a coating obtainable by
    (a) immersing a blank of a metal or a metal alloy in a bath containing the coating solution according to any one of claims 1 to 9, for a time period of from about 30 seconds to about 10 minutes; and
    (b) drying said blank having the coating solution on its surface at a temperature ranging from about room temperature to about 80°C, resulting in a coated blank.
EP02007662A 2002-04-04 2002-04-04 A coating solution for metals and metal alloys Withdrawn EP1350866A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP02007662A EP1350866A1 (en) 2002-04-04 2002-04-04 A coating solution for metals and metal alloys
DE60306569T DE60306569T2 (en) 2002-04-04 2003-04-04 Coating solution for metals and metal alloys
AT03007463T ATE332399T1 (en) 2002-04-04 2003-04-04 COATING SOLUTION FOR METALS AND METAL ALLOYS
EP03007463A EP1350867B1 (en) 2002-04-04 2003-04-04 A coating solution for metals and metal alloys

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WO2021163792A1 (en) * 2020-02-18 2021-08-26 Magna Powertrain Inc. Method of forming a splined component

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EP0613939A2 (en) * 1993-03-02 1994-09-07 Kyodo Yushi Co., Ltd. Graphite-free lubricating oil
EP0714975A1 (en) * 1994-12-02 1996-06-05 Showa Shell Sekiyu Kabushiki Kaisha Lubricating grease composition
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FR2378084A1 (en) * 1977-01-21 1978-08-18 Rostovsky O Neftemaslozavod PROCESS FOR PREPARING PLASTIC AND LIQUID LUBRICANTS
EP0613939A2 (en) * 1993-03-02 1994-09-07 Kyodo Yushi Co., Ltd. Graphite-free lubricating oil
EP0714975A1 (en) * 1994-12-02 1996-06-05 Showa Shell Sekiyu Kabushiki Kaisha Lubricating grease composition
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Publication number Priority date Publication date Assignee Title
WO2021163792A1 (en) * 2020-02-18 2021-08-26 Magna Powertrain Inc. Method of forming a splined component
US12214400B2 (en) 2020-02-18 2025-02-04 Magna Powertrain Inc. Method of forming a splined component

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DE60306569T2 (en) 2007-06-21
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