EP3626862A1 - Passivierungsverfahren einer stahlzinnplatte - Google Patents

Passivierungsverfahren einer stahlzinnplatte Download PDF

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Publication number
EP3626862A1
EP3626862A1 EP19198876.5A EP19198876A EP3626862A1 EP 3626862 A1 EP3626862 A1 EP 3626862A1 EP 19198876 A EP19198876 A EP 19198876A EP 3626862 A1 EP3626862 A1 EP 3626862A1
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EP
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Prior art keywords
tinplate
range
process according
zirconium
sulphate
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EP19198876.5A
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English (en)
French (fr)
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EP3626862B1 (de
Inventor
Stefano Martines
Giovanni ASTENGO
Armando Giannetti
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Tenova SpA
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Tenova SpA
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials
    • C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F5/00—Electrolytic stripping of metallic layers or coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/60—Adding a layer before coating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils

Definitions

  • the present invention concerns a passivation process of a steel tinplate.
  • the present invention concerns an electrolytic passivation process, with a low environmental impact, which allows obtaining a passivated steel tinplate, on which it is possible to make adhere a further coating, such as a paint layer, an ink or a polymeric film, with an excellent degree of adhesion.
  • the passivated steel tinplate obtained with the passivation process according to the present invention can be advantageously used to produce steel packaging, such as for example containers for packaging food products, chemical and cosmetic products.
  • the steel tinplate (hereinafter “tinplate”) is a steel sheet obtained by cold rolling, generally of a thickness up to a maximum of about 0.5 mm, coated on both faces with a thin tin layer, which has the function of protecting steel from corrosion.
  • the tin coating is generally made by electrolytic deposition of metallic tin on the steel sheet. Due to the exposure to air, a thin oxide layer is present on the surface of the tin coating.
  • the tinplate is mainly used to produce packaging, in particular cans for food products intended for human and animal consumption, packaging for chemical products, containers for aerosol, beverage cans and to produce parts of said packaging, such as closures, lids, bottoms, etc.
  • the tinplate has a high resistance to corrosion and stability against acids and a good processability.
  • the surface of the tinplate is also provided with an additional coating, for example a paint layer (e.g. epoxy, acrylic paints, etc.) or a laminated polymeric film (e.g. polyethylene terephthalate (PET), polypropylene (PP) film, etc.), to ensure greater protection of the surface of the container from corrosion with respect to the tin coating only.
  • a paint layer e.g. epoxy, acrylic paints, etc.
  • PP polypropylene
  • Paints, inks and coating polymeric films are generally applied to the tinplate at the end of the production process thereof and before its use in the production of packaging.
  • these coatings undergo mechanical processings (e.g. drawing and stretching), which can cause the deterioration or the detachment ( peel-off ) from the surface of the tinplate, if there is no good adhesion to the latter.
  • the packaging after being filled with the contents, is subjected to heat treatments (e.g. pasteurization, sterilization), which can damage the coating, for example by forming bubbles ( blistering ), or cause its detachment.
  • EP 2180084 A1 describes a passivation process which comprises a first step of treatment to partially remove the tin oxide layer originally present on the surface of the tinplate, until reducing it to a thickness layer in the range 0 - 3,5 mC/cm 2 (thickness measured by means of an electrolytic stripping method), by means of a cathodic electrolytic treatment in an aqueous solution of sodium hydrogen carbonate, followed by a second step of passivation treatment, in which the tinplate is subjected to a cathodic electrolytic treatment in an aqueous solution of zirconium sulphate to form a coating layer containing zirconium mainly in the form of oxide and hydroxide (passivation layer).
  • the zirconium-passivated tinplate is then subjected to washing in hot water to reduce the amount of sulphate ions present on the surface of the layer containing zirconium, preferably up to a value of weight per unit of area of sulphate ions lower than 7 mg/m 2 , since the presence of sulphate ions in relatively high amounts negatively affects the adhesion of the coatings to the passivation layer containing zirconium.
  • EP 2557202 A1 describes a passivation process which comprises a first step of treatment to partially remove the tin oxide layer present on the surface of the tinplate, until reducing it to a thickness layer in the range 0 - 3.5 mC/cm 2 , by means of a cathodic electrolytic treatment in an aqueous solution of sodium carbonate or sodium hydrogen carbonate or by immersion in an aqueous solution of sulphuric acid, followed by a second step, in which the tinplate is subjected to a cathodic electrolytic treatment in an aqueous solution of a sulphate of an alkali metal containing a zirconium compound to form a passivation layer containing zirconium.
  • the tinplate is then subjected to washing in hot water to reduce the amount of sulphate ions present on the surface of the passivation layer containing zirconium, preferably up to a value of weight per unit of area of sulphate ions lower than 7 mg/m 2 .
  • the Applicant set out to solve the primary objective of providing a passivation process of the tinplate that is of the Cr-free type, namely that does not use chromium compounds, but that nevertheless guarantees a high adhesion of the coatings, such as paints, inks or laminated polymer films.
  • the Applicant has observed that the degree of adhesion of the coatings to a passivated tinplate with zirconium compounds, as obtainable for example with the known processes described above, is influenced by the possible presence of carbonate ions on the surface of the passivation layer containing zirconium, as well as the presence of sulphate ions as already known in the state of the art.
  • the treatment for reducing the tin oxide layer being carried out electrolytically in an aqueous solution of a sulphate of an alkali metal, in addition to being more rapid and easily controllable than the treatment by immersion in a solution of sulphuric acid, is simple to make and does not require the adoption of particular safety systems for the operators or anticorrosive materials for the equipment, as is the case in the case of processes that use aqueous solutions of sulphuric acid.
  • the present invention therefore concerns a passivation process of a tinplate comprising the following steps in sequence:
  • the present invention concerns a process for producing a coated tinplate which comprises the following steps in sequence:
  • the passivated tinplate in accordance with the process according to the present invention is a substrate on which organic coatings, such as paints, lacquers, enamels, inks or polymeric films adhere very well.
  • organic coatings such as paints, lacquers, enamels, inks or polymeric films adhere very well.
  • the degree of adhesion is comparable to that of the chrome-passivated tinplates of the known art.
  • the process according to the present invention is a process with a low environmental impact. Furthermore, at least in one embodiment, the process does not even use fluorinated or nitrogen-based compounds which can give rise to nitrate compounds which, as is known, represent a problem from the point of view of the environmental impact.
  • FIG. 1 schematically shows the trend of the detachment strength (T-peel strength) of a coating as a function of the amount of carbonate ions present on the surface of the passivated tinplate.
  • the tinplate that can be treated with the passivation process according to the present invention does not present particular restrictions in terms of composition.
  • the tinplate can be a conventional tinplate, for example of the type used to produce packaging, such as containers (so-called cans) for food products intended for human and animal consumption, chemical products, containers for aerosol and to produce parts of said packaging, such as closures, lids, bottoms, etc.
  • the tin layer of the tinplate is preferably present in a weight per unit of area in the range 0.5-15.2 g/m 2 (expressed as metallic Sn; weight per unit of area referred to each face of the tinplate).
  • the coating layer of metallic tin is coated superficially by a tin oxide layer, which inevitably forms following the exposure of the tinplate to air.
  • step a the tinplate is subjected to at least one cathodic electrolytic treatment (that is, an electrolytic treatment in which the tinplate acts as a cathode) using as an electrolytic solution an aqueous solution containing at least one alkali metal sulphate.
  • the purpose of the electrolytic treatment of step a is to reduce the thickness of the tin oxide layer on the non-passivated tinplate.
  • the Applicant has observed that thickness values of the tin oxide layer lower than 6 mC/cm 2 promote the adhesion of the passivation layer containing zirconium applied in step b.
  • the thickness of the tin oxide surface layer obtained at the end of the treatment of step a is lower than or equal to 5.0 mC/cm 2 , more preferably it is comprised in the range 0.1-3.0 mC/cm 2 .
  • a thickness of the tin oxide layer in the aforesaid range promotes a more uniform and reproducible deposition of the passivation layer containing zirconium.
  • the thickness values of the tin oxide layer expressed in mC/cm 2 are considered to be determined by the method described in the Examples.
  • the aforesaid thickness values of the tin oxide can be obtained in step a by selecting the ion concentration in the electrolytic solution, the pH, the temperature and the current density applied in relatively wide ranges of values.
  • the sulphate of an alkali metal of the electrolytic bath of step a is selected from sodium sulphate, potassium sulphate or mixtures thereof.
  • the concentration of the alkali metal sulphate in the bath is in the range 30-150 g/l, more preferably in the range 40 - 100 g/l.
  • the cathodic electrolytic treatment is carried out in the aforesaid solution in substantial absence of carbonate ions, that is in the absence of carbonate and bicarbonate ions added on purpose.
  • the cathodic electrolytic treatment is carried out with an electric current density in the range 2-50 A/dm 2 , more preferably in the range 5 - 30 A/dm 2 .
  • the temperature of the electrolytic solution is in the range 20-80°C, more preferably in the range 40 - 60°C.
  • the pH of the electrolytic solution used in step b is in the range 6-8.
  • the duration of the cathodic electrolytic treatment is in the range 0.3-2.0 seconds, more preferably in the range 0.4-1.4 seconds.
  • the cathodic electrolytic treatment is carried out with a continuous electric current.
  • the tinplate can be subjected to a washing with water to eliminate any electrolyte residues or other impurities present on the surface.
  • the electrolytic solution used in step b is based on sulphate anions, the possible entrainment of these anions from step a to step b does not represent a criticality.
  • step b the tinplate treated in step a is submitted to at least one cathodic electrolytic treatment in a bath formed by an aqueous solution containing at least sulphate ions and zirconium ions.
  • the purpose of step b is to form a passivation layer containing zirconium on the tin oxide surface layer present on the tinplate after step a.
  • the treatment of step b allows the deposition of a passivation layer containing zirconium mainly in the form of oxide or hydroxide.
  • the amount of zirconium in the passivation layer containing zirconium is in the range 5-15 mg/m 2 .
  • the weight per unit of area of the passivation layer containing zirconium is meant to be determined by X-ray fluorescence absorption spectroscopy.
  • the electrolytic solution used in step b is an aqueous solution of zirconium sulphate.
  • the electrolytic solution used in step b is an aqueous solution containing zirconium sulphate and alkali metal sulphate, preferably sodium.
  • the concentration of zirconium ions in the electrolytic solution is preferably in the range 0.1-10.0 g/l, more preferably in the range 0.5-2.0 g/l.
  • the concentration of alkali metal sulphate in the electrolytic solution, where present is in the range 5-60 g/l, more preferably in the range 10-50 g/l.
  • the pH of the electrolytic solution used in step b is in the range 0.5-2.5, more preferably in the range 1.5-2.4.
  • the pH of the solution can be adjusted, for example, by adding an aqueous solution of sulphuric acid.
  • the temperature of the electrolytic solution used in step a is in the range 20-80°C, more preferably in the range 40 - 60°C.
  • the cathodic electrolytic treatment of step b is carried out with an electric current density in the range 2-50 A/dm 2 , more preferably in the range 5- 30 A/dm 2 .
  • the cathodic electrolytic treatment has a duration in the range 0.3-5.0 seconds, more preferably in the range 0.5-2.0 seconds.
  • the cathodic electrolytic treatment is carried out with a continuous electric current.
  • the passivated tinplate is subjected to a washing with water to remove any sulphate ions possibly present on the surface, which negatively affect the adhesion capacity of the coatings (both in the form of paint or ink and in the form of film) or they can give rise to the appearance of stains on the surface of the tinplate. It has been observed that generally the adhesion of the coating to the passivation layer is acceptable when a residual amount of sulphate ions lower than about 20 mg/m 2 is present on the passivated surface.
  • a coating has a degree of adhesion suitable for most applications if the detachment strength is greater than or equal to 60 N/10mm, determined with the T-peel strength test described in the examples.
  • the washing with water can be carried out by immersion of the passivated tinplate in water or with spray systems, preferably with hot water (e.g. up to 80°C).
  • the duration of the washing is preferably in the range 0.4-5.0 seconds, preferably in the range 0.5-2.0 seconds.
  • the washing is generally followed by a drying step, for example by exposure to ambient air or by heating.
  • the process according to the present invention does not envisage steps of treatment for the tinplate with solutions containing carbonate ions added on purpose, their concentration on the surface of the passivated tinplate is generally such as not to significantly affect the adhesion of the coating.
  • the concentration of carbonate ions on the passivated tinplate could be such as to create problems of coating adhesion.
  • the Applicant has observed that the best results of coating adhesion are obtained when the concentration of carbonate ions on the passivation layer containing zirconium is lower than or equal to about 20 mg/m 2 ( Figure 1 ).
  • the concentration of the sulphate and carbonate ions is considered to be measured by the method described in the Examples.
  • the tinplate passivated with the coating layer comprising zirconium obtained with the passivation process according to the present invention is a suitable support for the application of a coating, such as a paint layer, a lacquer layer, an enamel layer, an ink layer or a polymeric material film.
  • paints examples include epoxy paints, phenol-epoxy paints, vinyl paints, acrylic paints.
  • polymeric films that can be applied as a coating are: polyethylene terephthalate (PET), polypropylene (PP) film.
  • PET polyethylene terephthalate
  • PP polypropylene
  • the passivation process according to the present invention as well as the process for applying a coating on the passivated tinplate can be made with the techniques and equipment known to the person skilled in the art.
  • the thickness of the tin oxide layer was determined by means of a coulombometric method. According to this method, the tin oxide layer is reduced by applying a constant and controlled cathodic current, in an aqueous solution of hydrobromic acid (HBr) 0.1% which is deprived of the oxygen present therein by insufflation of gaseous nitrogen. The progress of oxide reduction is monitored by measuring the reduction potential. The delivered electric charge (current density * treatment time) to reach the complete reduction is used as a measurement of the thickness of the tin oxide layer.
  • HBr hydrobromic acid
  • the test is carried out in an electrolytic cell with a platinum counter-electrode and an Ag/AgCl reference electrode.
  • a cathodic current density of - 0.40 A/m 2 is applied to the sample and the potential is measured until the potential of the metallic tin is reached, indicating that the reduction has been completed.
  • the measured values are displayed in a graph potential v. treatment time, which typically shows a sharp decrease in the potential with a point of inflection at which the treatment time (ti) corresponding to the completed reduction of the tin oxide layer is determined.
  • the quantitative determination of the carbonate and sulphate ions on the surface of a tinplate was carried out according to the ASTM E1019, E1409 and E1806 standards.
  • the tinplate sample (dimensions 4 mm x 100 mm) was cleaned with acetone and dried with hot air before the test.
  • the test is based on the determination of the amount of CO 2 and SO 2 produced following the heat treatment of the sample in an induction furnace to cause the complete conversion of carbon into CO 2 and sulphur into SO 2 .
  • the test was carried out on three samples, extrapolating a final average value.
  • the test provides for the immersion of square samples (40x40 mm) of passivated (uncoated) lamina in a solution containing 3 g/l of Cysteine hydrochloride neutralized at pH 7 with Na 3 PO 4 0.2 M and allowed to boil for 1 hour.
  • the samples drilled with a 4 mm hole and skewered with a glass rod spacing them with 15 mm spacers, are introduced into a 1000 ml bottle, made of glass resistant to sterilization, filled with the Cysteine solution.
  • the bottle is introduced into a suitable pressure container which is heated at 110°C and remains at this temperature for 30 minutes.
  • the passivated tinplate in accordance with the present invention was coated with a white epoxy enamel using a "bar coater".
  • the applied coating layer had a thickness equal to 24 micrometres.
  • the coating was thermally treated at 200°C for 10 minutes and then allowed to cool up to room temperature by exposure to air. The completion of the curing of the coating was verified by the ASTM D 5402 method.
  • the dry adhesion strength of the coating was evaluated with the ASTM D3359 B method.
  • the method provides for the application of a strip of adhesive tape on the surface of the coating, on which a grid was previously engraved, and after 15 minutes of contact for its removal by a quick tear.
  • the detachment strength of the coating was determined by a comparative test derived from the ASTM D1876-08 method, which was modified as described below.
  • Two laminae of passivated and coated tinplate having dimensions of 100 mm x 10 mm were glued together by means of an epoxy structural adhesive (3M - EC 923 B/A).
  • the adhesive was applied on the laminae for a length of 30 mm, so as to leave free two 70 mm long ends (bent at 90° with respect to each other so as to form a "T") to be fixed to the traction machine.
  • a first series of samples (no. 1-7) of a (not passivated) tinplate having a tin layer of 2.8 g/m 2 by weight per unit of area on both faces was passivated using the process according to the present invention.
  • the tinplate was subjected to a cathodic electrolytic treatment to partially remove the tin oxide layer (step a).
  • the operating conditions of step a adopted for each sample are shown in Table 1 below.
  • Table 1 - Removal of tin oxide step a) Sample no. Na 2 SO 4 electrolytic bath (g/l) Treatment duration (s) Bath temp.
  • step b Samples 1, 3 and 5 were then subjected to a subsequent cathodic electrolytic treatment for zirconium deposition to form the passivation layer (step b) in a bath containing zirconium sulphate and sodium sulphate.
  • the operating conditions of step b adopted for each sample are shown in Table 2 below.
  • T 50 °C.
  • Table 2 - Cathodic electrodeposition of the passivation layer comprising zirconium step b) Test Na 2 SO 4 in the electrolytic bath (g/l) Treatment duration (s) Bath temp.
  • the data of Table 3 show that the coating applied on the passivated materials in accordance with the present invention has an optimal adhesion for most tinplate applications, the values of the T-peel test being greater than 60 N/10mm.
  • the adhesion is also comparable to that of the traditional chrome tinplates.
  • the materials passivated in accordance with the process according to the present invention also have a greater resistance to the detachment of the coating with respect to the reference sample when subjected to the cathodic wet adhesion test and a resistance comparable to the reference sample in the case of the dry adhesion test.
  • a second series of samples (no. C1 - C7) was prepared by submitting the material of the sample no. 1 of Table 1 to an electrolytic treatment for zirconium deposition (step b) under the same conditions as in sample C of Table 2.
  • step b was carried out in an electrolytic bath of zirconium sulphate and sodium sulphate added with an amount of sodium carbonate that was different for each sample. In some cases also the water used for the subsequent washing was added with amounts of sodium carbonate that were different for each sample.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Electroplating Methods And Accessories (AREA)
EP19198876.5A 2018-09-24 2019-09-23 Passivierungsverfahren einer stahlzinnplatte Active EP3626862B1 (de)

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IT201800008861 2018-09-24

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EP3626862A1 true EP3626862A1 (de) 2020-03-25
EP3626862B1 EP3626862B1 (de) 2021-03-10

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202000014572A1 (it) 2020-06-18 2021-12-18 Tenova Spa Procedimento di passivazione di una banda d’acciaio stagnata

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0732425A1 (de) * 1995-03-13 1996-09-18 British Steel plc Passivierung von verzinnter Blechen
EP2180084A1 (de) 2007-08-23 2010-04-28 Nippon Steel Corporation Umweltfreundliches stahlblech für behältermaterial, herstellungsverfahren dafür und umweltfreundliches laminiertes stahlblech für behältermaterial und vorbeschichtetes stahlblech für behältermaterial, jeweils hergestellt aus dem stahlblech
US20100119867A1 (en) * 2007-04-04 2010-05-13 Hiromitsu Date Plated steel sheet for cans and production method thereof
EP2557202A1 (de) 2010-04-06 2013-02-13 Nippon Steel & Sumitomo Metal Corporation Verfahren zur herstellung eines stahlblechs für ein containermaterial mit reduzierter umweltbelastung, stahlblech für ein containermaterial mit reduzierter umweltbelastung sowie beschichtetes stahlblech für ein containermaterial und vorbeschichtetes stahlblech für ein containermaterial, die aus dem stahlblech hergestellt worden sind
JP2018012858A (ja) * 2016-07-21 2018-01-25 日本パーカライジング株式会社 電解処理用金属表面処理剤、電解処理用金属表面処理剤の製造方法、及び、金属材料の表面処理方法

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Publication number Priority date Publication date Assignee Title
GB1220111A (en) * 1968-04-19 1971-01-20 Nippon Kokan Kk A method of treating tin plate or galvanized sheet
US6099714A (en) * 1996-08-30 2000-08-08 Sanchem, Inc. Passification of tin surfaces
US6045686A (en) * 1997-03-18 2000-04-04 The University Of Connecticut Method and apparatus for electrochemical delacquering and detinning
JP5633117B2 (ja) * 2008-05-12 2014-12-03 Ｊｆｅスチール株式会社 錫めっき鋼板の製造方法および錫めっき鋼板ならびに化成処理液

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0732425A1 (de) * 1995-03-13 1996-09-18 British Steel plc Passivierung von verzinnter Blechen
US20100119867A1 (en) * 2007-04-04 2010-05-13 Hiromitsu Date Plated steel sheet for cans and production method thereof
EP2180084A1 (de) 2007-08-23 2010-04-28 Nippon Steel Corporation Umweltfreundliches stahlblech für behältermaterial, herstellungsverfahren dafür und umweltfreundliches laminiertes stahlblech für behältermaterial und vorbeschichtetes stahlblech für behältermaterial, jeweils hergestellt aus dem stahlblech
EP2557202A1 (de) 2010-04-06 2013-02-13 Nippon Steel & Sumitomo Metal Corporation Verfahren zur herstellung eines stahlblechs für ein containermaterial mit reduzierter umweltbelastung, stahlblech für ein containermaterial mit reduzierter umweltbelastung sowie beschichtetes stahlblech für ein containermaterial und vorbeschichtetes stahlblech für ein containermaterial, die aus dem stahlblech hergestellt worden sind
JP2018012858A (ja) * 2016-07-21 2018-01-25 日本パーカライジング株式会社 電解処理用金属表面処理剤、電解処理用金属表面処理剤の製造方法、及び、金属材料の表面処理方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202000014572A1 (it) 2020-06-18 2021-12-18 Tenova Spa Procedimento di passivazione di una banda d’acciaio stagnata
WO2021255699A1 (en) * 2020-06-18 2021-12-23 Tenova S.P.A. A passivation process of a steel tinplate, passivated tinplate and coated passivated tinplate

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EP3626862B1 (de) 2021-03-10
ES2872278T3 (es) 2021-11-02
CN110938852B (zh) 2023-12-12
CN110938852A (zh) 2020-03-31

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