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
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  • 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
  • C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
• • 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
  • C23C22/34—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 fluorides or complex fluorides
• • 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
  • C23C22/46—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 oxalates
• • 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
  • C23C22/82—After-treatment
  • C23C22/83—Chemical after-treatment
• • 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
  • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
  • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
• • 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
  • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
  • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
  • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
  • C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
  • C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
  • C23G1/065—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors sulfur-containing compounds
• • 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
  • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
  • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
  • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
  • C23G1/08—Iron or steel
  • C23G1/086—Iron or steel solutions containing HF
• • 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
  • C10M2201/02—Water
• • 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
  • C10M2201/08—Inorganic acids or salts thereof
  • C10M2201/081—Inorganic acids or salts thereof containing halogen
• • 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
  • C10M2201/08—Inorganic acids or salts thereof
  • C10M2201/084—Inorganic acids or salts thereof containing sulfur, selenium or tellurium
• • 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
  • C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
  • C10M2207/123—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms polycarboxylic
• • 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
  • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M2209/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an alcohol or ester thereof; bound to an aldehyde, ketonic, ether, ketal or acetal radical
• • 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
  • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M2209/06—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an acyloxy radical of saturated carboxylic or carbonic acid
  • C10M2209/062—Vinyl esters of saturated carboxylic or carbonic acids, e.g. vinyl acetate
• • 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
  • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2217/02—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M2217/022—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an amino group
  • C10M2217/023—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an amino group the amino group containing an ester bond
• • 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
  • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2217/02—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M2217/024—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an amido or imido group
• • 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
  • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2217/02—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M2217/028—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a nitrogen-containing hetero ring
• • 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
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
• • 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
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/20—Metal working
  • C10N2040/244—Metal working of specific metals
  • C10N2040/247—Stainless steel
• • 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
• • 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
  • C10N2070/00—Specific manufacturing methods for lubricant compositions
  • C10N2070/02—Concentrating of additives
• • 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
  • C10N2080/00—Special pretreatment of the material to be lubricated, e.g. phosphatising or chromatising of a metal

Definitions

• the present invention relates to method for pretreatment of a metallic substrate for a subsequent metal cold forming process, said method comprising at least steps (1) and (2) and optionally step (3), namely providing at least one substrate having at least one surface at least partially made of at least one metal (1), contacting the at least one surface of the substrate provided in step (1) with an aqueous lubricant composition (A) having a pH value below 2.0 and comprising besides water oxalate anions (a1), thiosulfate anions (a2), chloride anions (a3), at least one film-forming polymer (a4), which is a homopolymer and/or copolymer being prepared by polymerization of at least one ethylenically unsaturated monomer, at least one wax (a5), and fluoride anions and/or bifluoride anions (a6), and optionally drying the coating film obtained after having performed step (2), a pretreated metallic substrate obtainable by the aforementioned inventive method, a method of cold forming of a
• Cold forming of metallic workpieces is conventionally achieved by rolling such as thread rolling, drawing, in particular sliding drawing or deep-drawing, pressing, stretch forming and/or cold upsetting of the workpieces in order to transform them into articles having a desired shape.
• Cold forming usually takes place at temperatures below the recrystallization temperature of the metallic material of the workpiece subjected to cold forming, such as at temperatures below and up to 450°C.
• No external heating source is used in the method of cold forming. Instead, any heat development or temperature increase in general is caused solely by frictional forces between the metallic workpiece and the work tools used during forming and due to internal friction forces generated by material flow in the workpiece.
• Cold forming usually results in an increased pressure, e.g.
• the temperature of the workpieces to be cold formed is initially at ambient temperature, i.e. at approximately 10 to 32 °C.
• the forming process is no longer a “cold forming” process, but rather a “semi-hot” forming, a hot forming or a forging process.
• the metallic workpieces are cold formed to shaped articles with a comparably only low degree of deformation rather low forces for the cold forming process to take place are needed.
• conventionally non-reactive forming oils are applied to the workpieces.
• usually at least one coating film such as a conversion coating film is applied onto the workpieces prior to the cold forming process, which functions as separating layer between the workpiece and the tools used in order to prevent a cold welding during the cold forming.
• the conversion coating film used as separating layer in this case can also function as lubricant film if no additional coating film is applied on top of it.
• Such processes are, e.g., disclosed in DE 1 179 437, DE 1 196 467 and EP 0 233 503 A1 :
• DE 1 179437 relates to a pretreatment of wires of iron or steel for a subsequent cold forming.
• An oxalate coating is applied for this purpose onto the wires.
• the coating is obtained by making use of a solution containing inter alia oxalic acid and an alkenyl phosphonic acid such as vinyl phosphonic acid in monomeric form.
• DE 1 196 467 also relates to a pretreatment of metal substrates for a subsequent cold forming.
• An oxalate coating is applied for this purpose onto the wires.
• the coating is obtained my making use of a solution containing inter alia oxalic acid and polyvinyl phosphonic acid and/or a copolymer comprising vinyl phosphonic acid in the form of monomeric units.
• EP 0 233 503 A1 relates to a pretreatment method for facilitating a subsequent cold forming of stainless steel substrates.
• An oxalate coating is applied for this purpose to the substrate.
• the coating is obtained by making use of an aqueous solution containing inter alia oxalic acid, fluoride and nitrate anions as well as a water-soluble polymer.
• the solution used is essentially free of any chloride anions and preferably is free of thiosulfate anions as well as the presence of these anions is undesired according to EP 0233503 A1.
• aqueous lubricant compositions such as soaps or soap solutions, e.g. based on alkali or earth alkali stearate, polymer dispersions, solid lubricants such as M0S2 and/or graphite, and/or oil-based lubricants can be used for forming corresponding lubricant films.
• Processes of this kind are, e.g., disclosed in EP 0 232 929 A1, WO 94/16119 A1, WO 2009/095373 A1, WO 2009/095375 A1 , WO 2009/095374 A1 and JP S5672090 A.
• EP 0 232 929 A1 relates to a two-step pretreatment method for facilitating a subsequent cold forming of stainless steel substrates.
• a first step an oxalate coating is applied onto the substrate by making use of a solution containing inter alia oxalic acid, hydroxyl ammonium sulfate as well as a water-soluble polymer.
• EP 0232 929 A1 teaches that the use of chloride and fluoride anions in the oxalating solutions should be avoided.
• a lubricant is applied onto the oxalate coating. Metal soaps are named as suitable lubricants in EP 0232929 A1.
• WO 94/16119 A1 discloses a liquid aqueous composition for forming a conversion coating on metal surfaces in a first step for a subsequent cold forming process.
• the composition comprises an organic cationic polymer and may further comprise oxalate anions.
• a lubricating film can be applied onto the conversion film by making use of inter alia oil-based lubricants and/or soaps.
• WO 2009/095373 A1 discloses a two-step pretreatment method for facilitating a subsequent cold forming of metal substrates.
• a phosphate layer on the surface of the workpiece is formed by using an aqueous acidic phosphatizing solution containing Ca, Mg and/or K cations.
• an aqueous alkaline lubricant composition containing organic polymers is applied.
• WO 2009/095375 A1 and WO 2009/095374 A1 both disclose a method for the preparation of metallic workpieces for cold forming.
• a lubricant coating layer is applied onto the metallic surface of the workpieces optionally bearing a conversion coating layer as separating layer by contacting the surface with an aqueous lubricant composition comprising at least one water-soluble, water-containing or water-binding oxide and/or silicate and an organic polymer in case of WO 2009/095375 A1 or by contacting the surface with an aqueous lubricant composition comprising at least two waxes and an organic polymer in case of WO 2009/095374 A1.
• JP S56 72090 A relates to a two-step pretreatment method for facilitating a subsequent cold forming of steel substrates.
• An oxalate coating is applied for this purpose onto the substrates in a first step.
• the oxalate coating is obtained by making use of a solution containing inter alia oxalic acid and a water-soluble organic titanium compound as well as a polyvinyl pyrrolidone.
• a lubricant is applied onto the oxalate coating.
• Metal soaps and solid lubricants are named as suitable lubricants in JP S5672090 A.
• oil-based lubricant systems may cause safety issues, as they are flammable and must be stored at flash points >150 °C as hazardous materials.
• oil-based lubricant formulations is undesired.
• Solid lubricants such as lubricants based on M0S2 and/or graphite are only feasible for heavy cold forming with extensive degrees of deformation and thus, such lubricants are of limited use only.
• sulfide present in such lubricant films often has a detrimental effect in particular on stainless steel. The use of aqueous lubricant compositions is thus more desirable both for ecological and economic reasons than using solid and/or oil-based lubricants.
• the conventional aqueous lubricant compositions of the prior art are, however, usually alkaline compositions such as the (metal) soaps and soap solutions disclosed in EP 0 232 929 A1, WO 2009/095373 A1, WO 2009/095375 A1, WO 2009/095374 A1 and JP S56 72090 A, which are for example based on alkali or earth alkali stearate.
• alkaline lubricant composition baths often have only comparably short lifetimes and thus have to be renewed rather frequently. This, of course, is disadvantageous both from an ecological view (higher amounts of water and of the constituents present in the compositions have to be used) and an economic view (higher energy costs and changeover time).
• the compositions used for generating said aforementioned conversion coating layer are acidic compositions - as already mentioned herein before.
• pretreatment process usually two different open treatment baths are employed, into which the metallic workpieces are dipped, namely a first bath containing the aqueous acidic conversion coating composition and a second bath containing the aqueous alkaline lubricant composition.
• EP 3290 544 A1 relates to an acidic water-based lubricating coating agent having a pH value of 2.0 to 6.5, which inter alia contains a chemical conversion component such as oxalic acid and a lubricating component such as a lipophilic lubricating component including an oil or a soap.
• the coating agent may further comprise a water-based resin as a binder component.
• EP 3290 544 A1 further discloses a one- step pretreatment method of metal substrates for a subsequent cold forming.
• JP S54 5847 A relates to a lubricant composition for facilitating the cold forming of metals.
• the lubricant contains oxalic acid and at least one constituent selected from water-soluble organic titanium compounds, vinyl pyrrolidone homopolymers and vinyl pyrrolidone copolymers.
• the lubricant composition may further contain a lubricating aid.
• the conventional pretreatment processes for cold forming known in the prior art not always result in a sufficiently high coating weight of the lubricant layer formed on the workpiece or - if a separating layer such as a conversion coating layer is also present underneath the lubricant layer - in a sufficiently high coating weight of the lubricant layer and said separating layer combined.
• This may result in only insufficient adhesion properties of the layer(s) to the metallic substrate.
• this can result in an ineffective separation of the tool from the workpiece after and during cold forming and in an only ineffective reduction of the coefficient of friction or even in an undesired cold welding, as an only insufficiently high amount of the coating layer(s) as measured by their coating weight remains present on the workpieces during the cold forming process.
• a first subject-matter of the present invention is a method for pretreatment of a metallic substrate for a subsequent metal cold forming process, said method comprising at least steps (1) and (2) and optionally step (3), namely (1 ) providing at least one substrate having at least one surface at least partially made of at least one metal, (2) contacting the at least one surface of the substrate provided in step (1 ) with an aqueous lubricant composition (A) having a pH value below 2.0, wherein the aqueous lubricant composition (A) comprises besides water
• (a4) at least one film-forming polymer, which is a homopolymer and/or copolymer being prepared by polymerization of at least one ethylenically unsaturated monomer, (a5) at least one wax, which is different from constituent (a4), and
• a further subject-matter of the present invention is a pretreated metallic substrate obtainable by the inventive method.
• a further subject-matter of the present invention is a method of cold forming a metallic substrate, characterized in that it comprises a step of subjecting the inventive pretreated metallic substrate to a cold forming process.
• a further subject-matter of the present invention is an aqueous lubricant composition (A) as defined hereinbefore in connection with the inventive pretreatment method.
• a further subject-matter of the present invention is a master batch to produce the inventive aqueous composition (A) by diluting the master batch with water and if applicable by adjusting the pH value. It has been surprisingly found that all constituents present in aqueous lubricant composition (A) can be formulated as and into an acidic composition at a pH value below 2.0. It has been in particular surprisingly found that composition (A) is stable under such acidic conditions and that in particular the at least one film-forming polymer present in composition (A) is stable in such an acidic environment.
• composition (A) can be used in the inventive method both as lubricant composition and as a conversion coating composition in a single step only and that, consequently, it is not necessary to either apply any conversion coating composition or any lubricant coating composition in an additional step and that it is also no longer necessary to perform a rinsing step after step (2).
• the method can be simplified which has economic and ecological advantages.
• baths containing the acidic aqueous lubricant composition (A) have comparably long lifetimes, in particular longer lifetimes that bath containing conventional alkaline aqueous lubricant compositions. This, of course, has economic and ecological advantages.
• the coating layer obtained from applying composition (A) adhered firmly on the substrate and showed good lubricant properties.
• the substrate pretreated by the inventive method can be subsequently subjected to a metal cold forming process, in particular with high speed drawing.
• a coating layer obtained from application of composition (A) to the substrate can be efficiently subjected to a drawing step for the purpose of metal cold forming.
• the coated metallic substrates obtained by the inventive method bear a sufficiently high coating weight of the coating layer(s) formed on the metallic substrates obtained from applying composition (A).
• the resulting coating layer(s) is/are homogenous, thick and adhered firmly on the surface of the substrate. It has been found that such a high coating weight not only ensures a good adhesion to the substrate, but also an effective reduction of the coefficient of friction during cold forming and to prevent any cold welding. It has been surprisingly found that inter alia selecting a pH value of composition (A) below 2.0 results in formation of a comparably thick conversion coating layer, which in turn is advantageous for the subsequent metal cold forming process. This in particular applies to metal substrates, which are at least partially made of stainless steel. In case of higher pH values, the formed conversion coating layers are not sufficiently thick.
• the conversion coating layers formed are homogeneous, in particular when using metal substrates, which are at least partially made of stainless steel. It has been found that inter alia the presence of fluoride and/or bifluoride and chloride and thiosulfate anions have been found as being advantageous in this regard.
• coated metal workpieces obtained from the inventive method have a good corrosion resistance. Further, it has been found that no stable foams have been formed during the inventive surface treatment process.
• the coating film obtained after step (2) or optionally after step (3) is a combined conversion and lubricant coating film.
• the coating film obtained combines the properties of a conversion layer and a lubricant layer.
• the lubricant coating film can be present on top of the conversion coating film.
• the combined layers can be separated and adjusted in part. For example, a longer treatment time in step (2) results in a thicker conversion layer, i.e. in a higher layer thickness of the conversion layer, calculated as coating weight, whereas a higher concentration of the at least one wax (a5) and optionally of the at least one constituent (a4) leads to a thicker lubricant layer, i.e. a higher layer thickness of the lubricant layer, calculated as coating weight. In this way, a combined conversion and lubricant layer tailored to the respective conditions of cold forming can be produced. Detailed description of the invention
• inventive composition (A) and the master batch used to prepare the composition (A) preferably has the meaning "consisting of”.
• inventive composition (A) in addition to the mandatory constituents therein (constituents (a1) to (a6) and water) one or more of the further optional components mentioned hereinafter may be contained in the composition.
• composition (A) used in the inventive method and the master batch All components/constituents can be present in each case in their preferred embodiments mentioned hereinafter. The same applies to the further subject-matters of the present invention.
• the inventive method is a method for pretreatment of a metallic substrate for a subsequent metal cold forming process.
• the inventive method comprises at least steps (1) and (2) and optionally additionally step (3).
• the inventive method may further comprise one or more additional steps.
• step (1) of the inventive method at least one substrate having at least one surface at least partially made of at least one metal is provided.
• the surface of the substrate used is at least partially made of at least one metal, i.e. at least one region of said surface is made of at least one metal.
• the surface can consist of different regions comprising different metals.
• the overall surface of the substrate is made of at least one metal. More preferably, the substrate consists of at least one metal.
• the at least one metal is selected from the group consisting of aluminum, aluminum alloys, zinc, steel including cold rolled steel, hot rolled steel, galvanized steel (zinc plated steel) including hot-dip galvanized steel (hot zinc dipped steel) or electrolytically galvanized steel, stainless steel, steel alloys including stainless steel alloys, magnesium and/or zinc-magnesium alloys and/or zinc-iron alloys and mixtures thereof.
• the metal is ferrous and most preferably is steel. Most preferred is stainless steel and/or alloys thereof.
• the at least one surface of the substrate is at least partially made of stainless steel, more preferably the substrate as such is made of stainless steel.
• substrates e.g. strips, sheets, slugs, wires, wire coils, more complicated shaped parts, sleeves, profiles such as hollow or solid profiles, tubes, discs, discs, rods, bars or cylinders can be used.
• step (1) may be cleaned by means of an acidic, alkaline or pH-neutral cleaning composition and/or etched before treatment with the acidic aqueous composition (A) in step (2) as it will be outlined hereinafter:
• an acidic, alkaline or pH-neutral cleaning composition and/or etched before treatment with the acidic aqueous composition (A) in step (2) as it will be outlined hereinafter:
• step (2) of the inventive method one or more of the following optional steps can be performed, preferably in this order:
• both steps (1a) and (1b) are performed.
• Rinsing included in step (1a) is preferably performed with deionized water or tap water.
• the acidic pickling is performed by making use of hydrochloric acid, hydrofluoric acid, sulphuric acid, nitric acid and/or phosphoric acid.
• at least step (1b) is performed, in particular by making use of hydrofluoric acid and/or nitric acid for pickling, in particular when the substrate is at least partially made of stainless steel.
• step (2) of the inventive method the at least one surface of the substrate provided in step (1) is contacted with, preferably dipped into, an aqueous lubricant composition (A) having a pH value below 2.0, wherein the aqueous lubricant composition (A) comprises besides water oxalate anions as constituent (a1), thiosulfate anions as constituent (a2), chloride anions as constituent (a3), at least one film-forming polymer as constituent (a4), which is a homopolymer and/or copolymer being prepared by polymerization of at least one ethylenically unsaturated monomer, at least one wax as constituent (a5) and fluoride anions and/or bifluoride anions as constituent (a6).
• an aqueous lubricant composition (A) comprises besides water oxalate anions as constituent (a1), thiosulfate anions as constituent (a2), chloride anions as constituent (a3), at least one film-forming poly
• the treatment procedure according to step (2) i.e. the “contacting”, can, for example, include a spray coating and/or a dip coating procedure.
• the composition (A) can also be applied by flooding the surface or by roll coating or even manually by wiping or brushing. However, dipping is preferred. In this case, the substrate used is dipped into a bath containing the composition (A).
• contacting step (2) is performed by at least partially dipping the substrate into a bath containing the aqueous lubricant composition (A) having a bath temperature in the range of from 20 to 95 °C, preferably of from 30 to 90 °C, in particular of from 45 to 85 °C, most preferably of from 50 to 75 °C.
• a bath temperature in the range of from 20 to 95 °C, preferably of from 30 to 90 °C, in particular of from 45 to 85 °C, most preferably of from 50 to 75 °C.
• the treatment time i.e. the period of time the surface is contacted with the aqueous composition (A) used in step (2) is preferably from 15 seconds to 20 minutes, more preferably from 30 seconds to 10 minutes, and most preferably 45 seconds to 5 minutes, as for example 1 to 4 minutes.
• composition (A) in the sense of the present invention preferably means that the composition (A) is a composition containing at least 50 wt.-%, preferably at least 60 wt.-%, more preferably at least 70 wt.-% in particular at least 80 wt.-%, most preferably at least 90 wt.-% or 95 wt.-% or 98 wt.-% or 99 wt.-% or even 100 wt.-% of water, based on its total content of organic and inorganic solvents including water.
• the composition (A) may contain at least one organic solvent besides water - however, in an amount significantly lower than the amount of water present.
• composition (A) is free of organic solvents.
• water is the only solvent/diluent present.
• composition (A) contains water in an amount of at least 50 wt.-%, more preferably of at least 60 wt.-%, even more preferably of at least 70 wt.-% and still more preferably of at least 80 wt.-%, in each case based on the total weight of composition (A).
• composition (A) has a pH value below 1.9, preferably below 1.7, in particular a pH value in a range of from 0.1 to 1.5, most preferably in a range of from 0.5 to 1.5.
• composition (A) is present in the form of a solution or dispersion, in particular in the form of a solution, preferably at a temperature of at least 40°C, in particular at least 50°C.
• composition (A) is free of phosphate anions. This means that at least on purpose no phosphate is added to composition (A). In case of subsequent heat treatment of sensitive components such as the hardening and tempering of screws otherwise phosphorus-induced delta-ferrite may be formed, which may lead to disadvantageous material properties.
• composition (A) is free of silicone, i.e. free of siloxanes and/or polysiloxanes. This means that at least on purpose no silicone is added to composition (A).
• the presence of silicones may be disadvantageous when applying coating materials such as paint to the substrate after having performed a subsequent cold forming.
• composition (A) has a solid content in the range of from 0.1 to 25 wt.-%, more preferably in the range of from 0.2 to 20 wt.-%, even more preferably in the range of from 0.3 to 15 wt.-%, still more preferably in the range of from 0.4 to 12 wt.-%, in each case based on the total weight of composition (A). The sum of all components/constituents present in composition (A) adds up to 100 wt.-%.
• composition (A) comprises (a1) oxalate anions it represents an oxalating composition, which is suitable of forming a conversion coating on the surface of a substrate. Since composition (A) also comprises (a5) at least one wax and at least one film-forming polymer (a4) it also represents a lubricant composition, which is suitable of forming a lubricating coating on the surface of a substrate.
• the oxalate anions (a1) are present in the composition (A) in an amount in the range of from 2 to 500 g/l, more preferably of from 5 to 100 g/l, in particular of from 10 to 50 g/l of oxalic acid, calculated in each case as oxalic acid dihydrate, and/or the thiosulfate anions (a2) are present in the composition (A) in an amount in the range of from 0.01 to 25 g/l, more preferably of from 0.5 to 10 g/l, in particular of from 1.0 to 5.0 g/l, calculated in each case as sodium thiosulfate, and/or the chloride anions (a3) are present in the composition (A) in an amount in the range of from 0.1 to 25 g/l, more preferably of from 0.5 to 10 g/l, in particular of from 1.0 to 5.0 g/l, calculated in each case as sodium chloride.
• oxalic acid also means the single and double deprotonated form of oxalic acid.
• oxalate also means the single and double protonated form thereof, the double protonated from being oxalic acid.
• oxalic acid dihydrate is used, as is it cheap and less hygroscopic.
• composition (A) The content of cations and anions mentioned herein with respect to composition (A) can be monitored and determined by the means of ICP-OES (optical emission spectroscopy with inductively coupled plasma). Said method is described hereinafter in detail.
• the content of free fluoride anions is, however, determined by means of a fluoride electrode.
• Composition (A) comprises at least one film-forming polymer, which is a homopolymer and/or copolymer being prepared by polymerization of at least one ethylenically unsaturated monomer as constituent (a4), which is different from constituent (a5).
• the at least one film-forming polymer is water-soluble or water-dispersible, more preferably water-soluble.
• the at least one film-forming polymer is soluble or dispersible, more preferably soluble, in composition (A).
• the at least one film-forming polymer (a4) is a homopolymer and/or copolymer, said homopolymer and/or copolymer being prepared at least from at least one monomer bearing at least one vinyl group, preferably selected from the group consisting of vinyl amine, vinyl alcohol, vinyl formamide, vinyl pyrrolidone, vinyl caprolactam, vinyl acetate and vinyl imidazole, preferably from at least one monomer selected from the group consisting of vinyl pyrrolidone and vinyl acetate, in particular from at least vinyl pyrrolidone.
• Exemplary polymers are Sokalan® K 17P, from BASF SE, Germany and Lupamin® 9030 from BASF SE, Germany.
• the at least one film-forming polymer (a4) is a copolymer at least one further monomer bearing at least one ethylenically unsaturated group and being different from the above defined monomers can be used for preparing constituent (a4).
• such further monomers bears at least one (meth)acrylic group.
• (Meth)acrylic groups include e.g. (meth)acrylate groups and (meth)acrylic acid groups.
• the further monomer can be an ionomer.
• the further monomer can also be ethylene, propylene, butylene, styrene etc.
• the term “(meth)acryl” means “acryl” and/or “methacryl”.
• “(meth)acrylate” means acrylate and/or methacrylate.
• the at least one film-forming polymer (a4) has a weight average molecular weight (M w ) in the range of from 1 000 to 100 000 g/mol, more preferably of from 3 000 to 75000 g/mol, even more preferably of from 5000 to 50000. Determination of M w is performed by gel permeation chromatography (GPC).
• the at least one film-forming polymer (a4) is present in the composition (A) in an amount in the range of from 0.05 to 20 wt.-%, more preferably in the range of from 0.10 to 15 wt.-%, even more preferably in the range of from 0.15 to 10 wt.-%, still more preferably in the range of from 0.20 to 7.5 wt.-%, in particular of from 0.25 to 5.0 wt.-%, in each case based on the total weight of the composition (A).
• Constituent (a5) is present in the composition (A) in an amount in the range of from 0.05 to 20 wt.-%, more preferably in the range of from 0.10 to 15 wt.-%, even more preferably in the range of from 0.15 to 10 wt.-%, still more preferably in the range of from 0.20 to 7.5 wt.-%, in particular of from 0.25 to 5.0 wt.-%, in each case based on the total weight of the composition (A
• Composition (A) comprises at least one wax as constituent (a5), which is different from constituent (a4).
• the at least one wax is a solid substance at room temperature (23 °C).
• DGF German Society for Fat Science
• M-l 1 (75) (2015) the at least one wax used as constituent (a5) satisfies this definition of a wax.
• Waxes according to this definition can be kneaded at 20 °C, have a firm (solid) to brittle hardness, have a coarse to fine crystalline structure, are translucent to opaque in color but not glassy or glass-like, melt without decomposition at temperatures above 40 °C, are slightly liquid above their melting point and have a low viscosity above their melting point, have a highly temperature-dependent consistency and solubility, and can be polished under light pressure.
• DGF DGF standard method M-l 1 (75)
• a substance is not a wax if it does not meet more than one of the above properties.
• the at least one wax (a5) is water-soluble or water-dispersible, more preferably water-dispersible.
• the at least one wax (a5) is soluble or dispersible in composition (A).
• composition (A) is obtainable by using an aqueous dispersion or solution of the at least one wax (a5) for its preparation.
• the at least one wax (a5) has a melting point in the range of from 40 °C to 170 °C, more preferably in the range of from 50°C to 160°C, especially preferred in the range of from 50 °C to 140 °C.
• composition (A) preferably comprises more than one wax as constituent (a5).
• composition (A) comprises at least two, more preferably at least three different waxes as constituents (a5).
• the at least two or at least three different waxes differ from each other at least in their melting temperature (melting point).
• melting point melting point
• the difference between melting points of at least two of the waxes is at least 20 °C.
• the at least one wax (a5) is present in the composition (A) in an amount in the range of from 0.1 to 20 wt.-%, more preferably in the range of from 0.5 to 15 wt.- %, even more preferably in the range of from 0.75 to 12.5 wt.-%, still more preferably in the range of from 1.0 to 10.0 wt.-%, in particular of from 1.5 to 9.0 wt.-%, most preferably in the range of from 2.0 to 7.5 wt.-%, in each case based on the total weight of the composition (A).
• the at least one wax (a5) is selected from the group consisting of cationic waxes, cationically stabilized waxes and non-ionic waxes.
• a "cationically stabilized wax” is preferably a wax that is stabilized by cationic groups in acidic medium such as in the composition (A) or is stabilized by at least one cationic surfactant.
• the at least one wax (a5) is stabilized by at least one emulsifier.
• the at least one wax (a5) can be stabilized by a cationic emulsifier (cationically stabilized) or can be stabilized by a non-ionic emulsifier (non-ionically stabilized).
• cationic emulsifiers are alkoxylated such as ethoxylated stearyl amine and/or polyalkoxylated such as polyethoxylated tallow amine.
• non-ionic emulsifiers are alcohols including for example diethylaminoethanol.
• the at least one wax (a5) is selected from the group consisting of polyolefin waxes (including polyethylene waxes, in particular HDPE (high density polyethylene) and/or polypropylene waxes, natural waxes including plant and animal waxes such as montan waxes, bees waxes and/or carnauba waxes, paraffin waxes (petroleum derived waxes) and mixtures thereof.
• polyolefin waxes including polyethylene waxes, in particular HDPE (high density polyethylene) and/or polypropylene waxes
• natural waxes including plant and animal waxes such as montan waxes, bees waxes and/or carnauba waxes
• paraffin waxes petroleum derived waxes
• olefin mainly refers to alkenes typical of polyolefins, preferably alkenes with 2 to 8, especially alkenes with 2 to 6 and especially alkenes with 2 to 4 carbon atoms, especially those with a terminal double bond.
• preferred representatives are ethylene, propylene, 1 -butene and isobutene.
• Ethylene and propylene are particularly preferred olefin monomers in the context of this invention.
• polyolefin is generally understood to mean homopolymers of a single type of olefin monomer (e.g.
• ethylene homopolymers or copolymers of at least two olefin monomers (e.g. polymers of mixtures comprising or consisting of ethylene, propylene, 1 -butene and/or isobutene).
• Polyolefins thus contain one or more types of olefin monomers and are therefore homopolymers or copolymers. However, they may also additionally contain one or more ethylenically unsaturated monomers other than olefin monomers, in particular ethylenically unsaturated monomers bearing carboxylic acid groups, polymerized or grafted.
• the polyolefin wax as constituent (a5) containing carboxyl groups has an acid number in the range from 3 to 50, preferably from 5 to 40, particularly preferably from 8 to 35, very particularly preferably from 10 to 25 and particularly preferably from 13 to 20 mg KOH/g.
• Polyolefin waxes are preferably selected from the group consisting of oxidized polyethylene waxes, oxidized polypropylene waxes, oxidized poly(ethylene-co-propylene) waxes and oxidized ethylene-olefin copolymers, ethylene-(meth)acrylic acid copolymers and polymers of ethylene and/or propylene other than the abovementioned copolymers, which have been grafted, for example, with maleic anhydride (converted into the hydrolyzed form, and carrying free COOH groups).
• maleic anhydride Converted into the hydrolyzed form, and carrying free COOH groups
• other ethylenically unsaturated acids such as acrylic acid can also be used for grafting.
• paraffin waxes used are preferably microcrystalline.
• Exemplary waxes that are commercially available and that can be used are, e.g. Aquacer® 1041 from BYK Chemie, Germany, Aquacer® 561 from BYK Chemie, Aquacer® 517 from BYK Chemie, Wiikonil® 0-33a from Miinzing Chemie and Licowax® KST from Clariant, Germany,
• composition (A) further comprises at least one of fluoride anions and bifluoride anions as constituent (a6).
• composition (A) comprises fluoride anions as constituent (a6), more preferably in combination with bifluoride anions.
• fluoride anions and/or bifluoride anions are present in the composition (A) in each case independently of one another in an amount in the range of from 0.01 to 25 g/l, more preferably of from 0.5 to 10 g/l, in particular of from 1.0 to 5.0 g/l, calculated as sodium fluoride in case of fluoride anions and as sodium bifluoride in case of bifluoride anions.
• composition (A) may comprise at least one furthers constituent (a7).
• Said at least one further constituent (a7) is preferably selected from the group consisting of thickeners, pigments, fillers, corrosion inhibitors, defoamers, surfactants and mixtures thereof.
• Constituent(s) (a7) may be present in amount of from 0.01 to 10 wt.-% in composition (A), based on the total weight of composition (A).
• defoamers are polymer-based, silicone-free defoamers.
• the amount of the at least one defoamer in composition (A) is preferably in a range of from 0.01 to 3 wt.-%, based on the total weight of composition (A).
• corrosion inhibitors are morpholine, benzylamine, butindiol, diisopropylamine nitrite, morpholine nitrite, 2-(2-heptadec-8-enyl-2-imidazolin-1- yl)ethanol, dicyclohexylamine nitrite, cyclohexylamine benzoate, dicyclohexylamine caprylate, guanadine chromate, hexamethyleneimine benzoate, dicyclohexylamine benzoate, ethylaniline, mercaptobenzotriazole, pyridine, rosin amine, phenylacridine, hexamethylentetramin, nonylphenoxyacetic
• the amount of the at least one corrosion inhibitor in composition (A) is preferably in a range of from 0.01 to 3 wt.-%, based on the total weight of composition (A).
• thickeners are polysaccharide, polysiloxane, polyvinlyamide, polyacrylamide and polyglycol.
• pigments and fillers are boron nitride, graphite and molybdenum sulfide.
• graphite and molybdenum sulfide are solid lubricants and their use is related to disadvantages as outlined in the introductory part, preferably no such pigments, in particular neither graphite nor molybdenum sulfide, is present in composition (A).
• surfactants are fatty alcohol alkoxylates and especially fatty alcohol ethoxylates.
• Optional step (3) of the inventive method is a step, wherein the coating film obtained after step (2) is optionally dried.
• the drying step (3) may be preferably performed, e.g. at a temperature in the range of 15°C to 100°C, more preferably at a temperature in the range of 18°C to 95°C, in particular at a temperature in the range of 20°C to 90°C.
• a further subject-matter of the present invention is a pretreated metallic substrate obtainable by the inventive method.
• the coating film obtained after step (2) or optionally after step (3) is a combined conversion and lubricant coating film.
• the coating film obtained combines the properties of a conversion layer and a lubricant layer.
• the pretreated metallic substrate obtainable by the inventive method contains a conversion coating film obtained by performing step (2) and further contains a lubricant coating film on top of said conversion coating film also obtained by performing step (2).
• the coating film obtained after step (2) or optionally after step (3) is chemically heterogeneous.
• the coating film present on the surface of the substrate after having performed step (2) and optionally step (3) has a coating weight in a range of from 1.0 to 40.0 g/m 2 , preferably in a range of from 5.0 to 35.0 g/m 2 , more preferably in a range of from 10.0 to 30.0 g/m 2 .
• the method for determining the coating weight is disclosed in the example section.
• a further subject-matter of the present invention is a method of cold forming a metallic substrate, characterized in that it comprises a step of subjecting the inventive pretreated metallic substrate according to a cold forming process, preferably by drawing.
• All possible cold forming processes known in the prior art can be carried out, in particular rolling such as thread rolling or beating, e.g. for nut or bolt blanks, drawing, in particular sliding drawing (tensile compression forming), e.g. of welded or seamless tubes, hollow sections, solid sections, wires or rods, e.g. during wire drawing or tube drawing, or deep-drawing, e.g. of strips or sheet metal, pressing such as cold extrusion (pressure forming), e.g. of hollow or solid bodies, stretch forming (forming to gauge block/final size) and/or cold upsetting, e.g. from wire sections to fasteners such as nuts.
• pressure forming pressure forming
• stretch forming forming to gauge block/final size
• cold upsetting e.g. from wire
• the most common shaped bodies to be formed from the inventive pretreated metallic substrates are strips, sheets, slugs, wires, wire coils, more complicated shaped parts, sleeves, profiles such as hollow or solid profiles, tubes, discs, discs, rods, bars or cylinders.
• the cold-formed substrate obtained after the cold forming process still bears at least part of the coating film obtained after having performed step (2) and optionally step (3): Due to the amount of the coating weight of the coating film obtained after step (2) or optionally step (3) present on the pretreated substrate, said coating film "survives" conventional cold forming processes.
• the coating film may be removed from the cold formed substrate, e.g., by using an aqueous cleaning composition.
• the obtained substrate is preferably cleaned, in order to remove the conversion and lubricant coating film from the substrate, e.g. by means of alkaline cleaners, acids or pickling agents.
• a further subject-matter of the present invention is an aqueous lubricant composition (A) as defined hereinbefore in connection with the inventive pretreatment method.
• a further subject-matter of the present invention is a master batch to produce the inventive aqueous composition (A) by diluting the master batch with water and if applicable by adjusting the pH value.
• the master batch typically contains the constituents of the aqueous composition (A) to be produced in the desired proportions, but at a higher concentration.
• Such master batch is preferably diluted with water to the concentrations of constituents as disclosed above to form the aqueous composition (A). If necessary, the pH value of the aqueous composition (A) may be adjusted after dilution of the master batch.
• the master batch is diluted or to add any of the optional components after diluting the master batch with water. It is however preferred that the master batch already contains all necessary components.
• the master batch is diluted with water and/or an aqueous solution in the ratio of 1:5,000 to 1:5, more preferred 1:1,000 to 1:10, most preferred in the ratio of 1:300 to 1:10 and even more preferred 1:150 to 1:50 to produce composition (A).
• the total acid (TA) is the sum of the divalent cations present as well as free and bound oxalic acids (the latter being oxalates). It is determined by the consumption of 0.1 M NaOH using 10 to 15 drops of phenolphthalein water solution as test indicator. For this, 10 ml of the composition are pipetted into a suitable vessel, for example a 300 ml Erlenmeyer flask and diluted with 50 ml of deionized water. It is then titrated with 0.1 M NaOH until a color change to red has taken place. The consumption in ml per 10 ml of the diluted composition corresponds to the total acid score (TA).
• the non-volatile fraction (solids or solid content) is determined in accordance with DIN EN ISO 3251 (date: June 2019). This involves weighing out 1 g of sample into an aluminum dish which has been dried beforehand and drying the dish with sample in a drying cabinet at 130°C for 60 minutes, cooling it in a desiccator, and then reweighing. The residue, relative to the total amount of sample employed, corresponds to the nonvolatile fraction. 3. ICP-OES
• ICP-OES inductively coupled plasma atomic emission spectrometry
• Inventive example 11 An acid stable aqueous polymeric lubricant composition 11 was prepared in a high speed mixer with stirring. The composition of this lubricant is given in Table 1.
• Table 1 Composition of lubricant example 11 100.0
• Polymer 1 is a polyvinyl pyrrolidone homopolymer. A commercial product available from BASF SE has been used. Aqueous wax dispersion 1 contains a polypropylene wax, which is commercially available from BYK Chemie. Aqueous wax dispersion 2 contains a microcrystalline wax, which is commercially available from Michelman. Wax 3 is a montan wax, which is dispersible in aqueous medium.
• the composition has a pH value below 2.0.
• the commercially available product Gardobond ® AS 4200 which is an oxalating treatment solution containing oxalic acid, chloride and/or fluoride anions, and sodium thiosulfate, has been used as comparative composition C1.
• compositions C2, C3, C4 and C5 were prepared.
• Composition C2 was identical to lubricant example 11, but no sodium chloride was used for its preparation.
• Composition C3 was identical to lubricant example 11, but no sodium thiosulfate was used for its preparation.
• Composition C4 was identical to lubricant example 11, but no sodium chloride and no sodium thiosulfate were used for its preparation.
• Composition C5 was identical to lubricant example 11 , but its pH was adjusted to be >3.
• substrate S1 As metal workpiece the following substrate S1 was used:
• the workpiece was dipped in a cleaning bath with a 50 g/L aqueous cleaning solution of Gardoclean ® 351 available from Chemetall GmbH at 90°C for 10 min. and then rinsed by cold tap water for 1 min. Afterwards, the surface purified workpiece was then pickled by using an aqueous solution containing 20 wt.-% nitric acid and 4 wt.-% hydrofluoric acid at room temperature (23°C) for 1 min. and subsequently rinsed by cold tap water for 1 min.
• the workpiece was dipped into a bath containing lubricant example 11 at 65°C for 10 min.
• Substrate S1 as described hereinbefore was used as workpiece.
• the workpiece was treated as follows:
• the workpiece was dipped in a cleaning bath with a 50 g/L aqueous cleaning solution of Gardoclean ® 351 available from Chemetall GmbH at 90°C for 10 min. and then rinsed by cold tap water for 1 min. Afterwards, the surface purified workpiece was then pickled by using an aqueous solution containing 20 wt.-% nitric acid and 4 wt.-% hydrofluoric acid at room temperature (23°C) for 1 min. and subsequently rinsed by cold tap water for 1 min.
• the workpiece was dipped into a bath containing Gardobond ® AS 4200 at 65°C for 10 min.
• a substrate S1 was treated in the same manner as described hereinbefore in item 2.1 except in that one of compositions C2, C3, C4 and C5 was used instead of 11.
• the resulting coating layer of the coated workpiece is homogenous, thick and adhered firmly on the treated surface of the workpiece.
• the top coating layer formed by the method is a polymer lubricant layer and the bottom coating layer formed is an oxalate coating layer. Coating layers properties are observed using SEM technology The bottom oxalate coating layer on the stainless-steel surface was proven to be a sufficiently closed coating layer on the surface of the metal workpiece.
• the coating weights on the substrate were determined using the following test method:
• the coated workpiece was weighted. Then, the polymer lubricant coating layer was washed with boiling xylene in order to detach it and subsequently with boiling water. The workpiece was then dried and weighted. The oxalate coating layer was washed with an alkaline solution containing NaOH, triethyl amine and EDTA (PL 83 from Chemetall GmbH) in order to detach it. Finally, the workpiece was rinsed with water, dried and weighted once again.
• the resulting coating weights are listed in Table 2.
• Table 2 Coating weights on substrate surfaces (substrate S1 ) in g/m 2
• the coated substrate shows very good lubricating properties and is very suitable for cold forming, even with high drawing speeds, and for cold extrusion.
• the coating layers adhere firmly on the metal surface of the substrates, even after cold forming.
• the remaining coating adhered still firmly on the metal surface and the remaining coating layer can be washed using aqueous alkalic cleaner, e.g. Gardoclean ® S 5171 with Gardobond ® Additive H 7375 from Chemetall GmbH, or aqueous acidic cleaner, e.g. Gardobond ® Additive H 7132 with Gardobond ® Additive H 7390 from Chemetall GmbH.
• aqueous alkalic cleaner e.g. Gardoclean ® S 5171 with Gardobond ® Additive H 7375 from Chemetall GmbH
• aqueous acidic cleaner e.g. Gardobond ® Additive H 7132 with Gardobond ® Additive H 7390 from Chemetall GmbH.
• the resulting oxalate coating layer on stainless steel is closed and homogenous.
• the coating weight on the substrate was determined using the following test method:
• the oxalated workpiece was weighted.
• the oxalate coating layer was washed with an alkaline solution containing NaOH, triethyl amine and EDTA (PL 83 from Chemetall GmbH) in order to detach it. Finally, the workpiece was rinsed with water, dried and weighted once again.
• the resulting oxalate coating weight is 10 g/m 2
• the coated substrate shows no lubricating properties at all and is thus as such not suitable for cold forming.
• the oxalate coated stainless-steel substrate has to be subjected to lubrication in an additional process step.

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• 2021
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