Classifications

• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • 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
  • 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
  • C23C22/02—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 non-aqueous solutions
• • 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
  • C23C22/40—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 molybdates, tungstates or vanadates
  • C23C22/44—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 molybdates, tungstates or vanadates containing also 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
  • C23C22/73—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 characterised by the process
• • 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
  • C23C22/73—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 characterised by the process
  • C23C22/74—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 characterised by the process for obtaining burned-in conversion coatings
• • 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
  • C23C22/73—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 characterised by the process
  • C23C22/76—Applying the liquid by spraying

Definitions

• the invention relates to a method of producing an aluminium or aluminium alloy strip with a heat-seal lacquer on a first surface and an epoxide based stove lacquer on the second surface.
• the invention relates to the preparation of cleaned surfaces with good adhesion properties of the aforementioned organic coatings on aluminium or aluminium alloy strips intended for the manufacturing of lacquered and deep- drawn capsules closed with a heat-sealed membrane lid for packaging portions5 of coffee.
• rinse and no-rinse processes are generally known in the chemical treatment of metal surfaces, for example for the subsequent application of paints, adhesives and/or plastics.
• rinse and no-rinse processes the metal0 surfaces are freed from oil, dirt and other residues in a first stage. Any residues of chemicals from this first stage are removed by rinsing with water.
• the clean metal surface is wetted with an aqueous bath solution which is rinsed off.
• EP-A-0 008 942 discloses treatment solutions, preferably for aluminum cans, containing:
• DE-C-24 33 704 describes treatment baths for increasing paint adhesion and permanent protection against corrosion inter alia on aluminum which may contain from 0.1 to 5 g/l of polyacrylic acid or salts or esters thereof and 0.1 to 3.5 g/l of ammonium fluorozirconate, expressed as Zr0 2 .
• US-A-4, 992,116 describes treatment baths for the conversion treatment of aluminum with pH values of around 2.5 to 5 which contain at least three components, namely:
• WO-A-92/07973 describes a chromium-free treatment process for aluminum which uses 0.01 to around 18% by weight of H 2 ZrF 6 and 0.01 to around 10% by weight of a 3-(N-Ci-4-alkyl-N-2-hydroxyethylaminomethyl)-4-hydroxystyrene polymer as essential components in the form of an acidic aqueous solution.
• DE-A-43 17 217 describes a process for the pretreatment of surfaces of aluminum or its alloys before a second conversion treatment for permanent corrosion control, in which the surfaces are contacted with acidic aqueous treatment solutions which contain complex fluorides of the elements boron, silicon, titanium, zirconium or hafnium either individually or in admixture with one another in concentrations of the fluoroanions of, in total, 100 to 4,000 and preferably 200 to 2,000 mg/l and which have a pH value of 0.3 to 3.5 and preferably in the range from 1 to 3.
• the treatment solutions may additionally contain polymers of the polyacrylate type and/or in the form of reaction products of poly(vinylphenol) with aldehydes and organic hydroxyfunctional amines in concentrations below 500 mg/l and preferably below 200 mg/l.
• Phosphoric acid is another optional constituent of these baths.
• US-A-4, 136,073 claims a chromium-free treatment process for aluminum surfaces, in which the surfaces are contacted with acidic (pH 1 .2 to 5.5) aqueous solutions containing an organic film former and a soluble titanium compound in a ratio by weight of polymer to titanium of 100:1 to 1 :10.
• the preferred titanium concentration is between 0.01 and 5% by weight.
• US-A-5, 868872 discloses a chromium-free process for the no-rinse treatment of aluminium and its alloys and aqueous bath solutions suitable for this process.
• the surfaces are contacted with solutions containing:
• An object of the present invention is to provide a method of the type mentioned at the beginning with a good adhesion of the aluminium or aluminium alloy strip with a heat-seal lacquer on a first surface and an epoxide based stove lacquer on the second surface and the epoxide based stove lacquer without the need of a Cr(lll) conversion coating.
• the aluminium or aluminium alloy strip manufactured with the method according to the present invention shall be qualified for the manufacture of deep-drawn capsules for packaging portions of coffee, the capsules having a heat-seal lacquer on the inner surface of the capsule and an epoxide based coloured stove lacquer on the outer surface of the capsule.
• a further object is to provide a method of producing a chromium-free conversion coating on a surface of an aluminium or aluminium alloy strip in a continuous production line, the chromium-free conversion coating having good adhesion properties of a heat-seal lacquer on a first surface and an epoxide based stove lacquer on the second surface of the aluminium or aluminium alloy strip intended for the manufacturing of lacquered and deep-drawn capsules closed with a heat-sealed membrane lid for packaging portions of coffee.
• the first of the aforementioned objectives is achieved by way of the invention in that a chromium-free conversion coating is produced on the first and second surface of the aluminium or aluminium alloy strip in a continuous production line before applying the heat-seal lacquer and the stove lacquer, the chromium-free conversion coating is produced by
• a no-rinse process by treatment with an aqueous solution of 5 to 10 wt.- % hexafluorotitanic acid (H 2 TiF 6 ) and 2.5 to 5 wt.-% hexafluorozirconic acid (H 2 ZrF 6 ), or
• a no-rinse process by treatment with an aqueous solution of 5 to 10 wt- % hexafluorotitanic acid (H 2 TiF 6 ) and 2.5 to 5 wt.-%hexafluorozirconic acid (H 2 ZrF 6 ), or
• Cleaning and degreasing is preferably made by spraying the strip with an aqueous solution of 5 to 50 g/l, preferably 15 to 25 g/l, of an initial solution comprising 0.10 to 1.0 wt.-% bisoctyl dimethyl ammonium chloride, 5 to 10 wt.- % potassium hydroxide, 5 to 10 wt.-% phosphate (P) and ⁇ 5 wt.-% cationic tenside.
• pickling is preferably made by spraying the strip with an aqueous solution of 5 to 50 g/l, preferably 15 to 25 g/l, of an initial solution comprising 65 to 80 wt.-% ortho phosphoric acid.
• pickling is preferably made by spraying the strip with an aqueous solution of 5 to 30 g/l, preferably 8 to 15 g/l, of a first initial solution comprising 25 to 50 wt.-% sulphuric acid and 5 to 15 wt.- % non ionic tenside, and 0.1 to 10 g/l, preferably 1 to 3 g/l, of a second initial solution comprising 5 to 7 wt.-% hydrofluoric acid.
• the conversion coating is preferably made by spraying the strip with a solution of 50 to 200 g/l, preferably 80 to 120 g/l, of an initial solution comprising silane and 10 to 25 wt.-% ethanol.
• the conversion coating is preferably made by spraying the strip with an aqueous solution of 10 to 160 g/l, preferably 30 to 50 g/l, of a first initial solution comprising 5 to 10 wt.-% hexafluorotitanic acid and 2.5 to 5 wt.-% hexafluorozirconic acid, and 1 to 10 g/l, preferably 7 to 9 g/l, of a second initial solution comprising 20 to 21 wt.-% silica.
• the conversion coating is preferably made by spraying the strip with an aqueous solution of 5 to 50 g/l, preferably 15 to 25 g/l, of a first initial solution comprising ⁇ 1 wt.-% diammonium dimolybdate and 5 to 10 wt.-% hexafluorozirconic acid, and 0.01 to 0.3 g/l, preferably 0.1 to 0.3 g/l, of a second initial solution comprising 10 to 25 wt.-% ammonium fluoride and 10 to 25 wt.-% ammonium hydrogen difluoride.
• the conversion coating is preferably made by spraying the strip with an aqueous solution of 5 to 50 g/l, preferably 15 to 25 g/l, of a first initial solution comprising ⁇ 1 wt.-% diammonium dimolybdate and 5 to 10 wt.-% hexafluorozirconic acid, and 0.01 to 0.3 g/l, preferably 0.1 to 0.3 g/l, of a second initial solution comprising 10 to 25 wt.-% ammonium fluoride and 10 to 25 wt.-% ammonium hydrogen difluoride, and 0 to 2 g/l, preferably 0.05 to 0.2 g/l, of a third initial solution comprising 25 wt.-% polycarboxylic acid in water.
• a conventionally cleaned and rinsed metal surface after rinsing with deionized water and drying and/or removal of the water film by squeegees, is wetted in any manner with the solution of silanes in the polar organic solvent aqueous treatment solution in such a quantity that around 2 to 20 ml and preferably around 5 to 10 ml of the polar organic treatment solution are applied per square meter of surface area.
• the treatment solutions in the preferred no rinse process according to the invention may be applied to the precleaned metal strips by any method which is capable of producing a uniform, defined liquid film on the metal surface in the quantity ranges indicated.
• the roller application process using two to four rollers has proved to be particularly effective, although wetting of the strip by spraying or immersion and subsequent removal of the excess liquid film, for example by plastic-coated equalizing rollers or an adjustable air knife, is also suitable.
• the temperature of the treatment solution may be in the range from 15°C to 30°C and is preferably in the range from 20°C to 25°C.
• the liquid film applied to the metal surface is allowed to react thereon for about 1 to 40 seconds, after which the film is dried and heat-treated at elevated temperature.
• the process steps of contact with the metal surface and drying may also be combined.
• a formable, water-insoluble solid film with a weight per unit area of around 5 to 50 mg Si/m 2 and preferably around 10 to 30 mg Si/m 2 is left on the metal surface.
• the drying and/or heat treatment of the liquid film applied to the metal surface, or rather of the chemicals applied with it, may be carried out at temperatures of around 80°C to 140°C, temperatures in the range from 110°C to 120°C being preferred.
• Both acidic and alkaline cleaners are suitable for the cleaning pretreatment of the metal surfaces to be wetted in accordance with the invention.
• the layers obtained with the treatment solution according to the invention provide a uniform finish of the substrate.
• suitable organic coatings subsequently applied they satisfy the requirements of the food packaging industry.
• the following example relates to a no-rinse process with a conversion coating by treatment with a solution of silanes in ethanol.

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• Chemical & Material Sciences (AREA)
• General Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Chemical Treatment Of Metals (AREA)
• Cookers (AREA)

Priority Applications (4)

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Cited By (6)

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Citations (15)

• 2011
  • 2011-06-10 EP EP11004742A patent/EP2532769A1/en not_active Withdrawn
• 2012
  • 2012-06-01 ES ES12725321.9T patent/ES2668270T3/es active Active
  • 2012-06-01 WO PCT/EP2012/002324 patent/WO2012167889A1/en not_active Ceased
  • 2012-06-01 PL PL12725321T patent/PL2718479T3/pl unknown
  • 2012-06-01 HR HRP20180845TT patent/HRP20180845T1/hr unknown
  • 2012-06-01 EP EP12725321.9A patent/EP2718479B1/en active Active

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