EP4328345A1 - Verfahren zur vorbehandlung einer zu verzinkenden zaunplatte und eine vorbehandelte zaunplatte - Google Patents

Verfahren zur vorbehandlung einer zu verzinkenden zaunplatte und eine vorbehandelte zaunplatte Download PDF

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Publication number
EP4328345A1
EP4328345A1 EP23192614.8A EP23192614A EP4328345A1 EP 4328345 A1 EP4328345 A1 EP 4328345A1 EP 23192614 A EP23192614 A EP 23192614A EP 4328345 A1 EP4328345 A1 EP 4328345A1
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EP
European Patent Office
Prior art keywords
pickling
amount
fence panel
flux composition
flux
Prior art date
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Pending
Application number
EP23192614.8A
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English (en)
French (fr)
Inventor
Frans van Bakel
Vicky Riepen
Marcel van Hoeij
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Balak Coatings NV
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Balak Coatings NV
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Publication date
Application filed by Balak Coatings NV filed Critical Balak Coatings NV
Publication of EP4328345A1 publication Critical patent/EP4328345A1/de
Pending legal-status Critical Current

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    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/30—Fluxes or coverings on molten baths
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/38—Wires; Tubes
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/38—Wires; Tubes
    • C23C2/385—Tubes of specific length
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C23C2/405—Plates of specific length
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H17/00—Fencing, e.g. fences, enclosures, corrals
    • E04H17/14—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
    • E04H17/16—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts using prefabricated panel-like elements, e.g. wired frames
    • E04H17/161—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts using prefabricated panel-like elements, e.g. wired frames using wire panels

Definitions

  • the invention relates to a method for pre-treating a fence panel to be galvanized.
  • Metal components often require effective protection against corrosion due to the application.
  • steel fence panels for indoor and outdoor fencing require efficient corrosion protection that can withstand long-term loads.
  • the main method of protecting steel from corrosion with metallic zinc coatings is hot-dip galvanizing.
  • Steel is immersed continuously or piece by piece at temperatures of approximately 450 °C to 600 °C in a heated vat with liquid zinc (melting point of zinc: 419.5 °C), so that a resistant alloy layer of iron and zinc is formed on the steel surface and above it a very firmly adhering pure zinc layer.
  • a 10-20 m% aqueous hydrogen chloride (HCl) solution is generally used in a pickling bath.
  • HCl hydrogen chloride
  • the pickling solution produces very acidic rinse water if a rinse takes place after pickling.
  • EP2725115 describes a flux composition for the treatment of a metal surface, consisting of (a) more than 40 and less than 70 wt.% zinc chloride, (b) 10 to 30 wt.% ammonium chloride, (c) more than 6 and less than 30 wt.% of a group of at least two alkali metal chlorides including sodium chloride and potassium chloride, d) 0 to 2 percent by weight lead chloride, and e) 0 to 15 percent by weight tin chloride, provided that the KCl/NaCl weight ratio of said group of at least two alkali metal chlorides is between 2.0 and is 8.0.
  • WO2010081905 discloses a flux for hot-dip galvanizing consisting of: 36 to 80 percent by weight zinc chloride (ZnCl2); 8 to 62 percent by weight ammonium chloride (NH4Cl); 2.0 to 10 percent by weight of at least one of the following compounds: NiCl2, MnCl2 or a mixture thereof.
  • the invention further relates to a flux bath, a process for hot-dip galvanizing of an iron or steel object as well as to the use of this flux.
  • GB2480913 describes a panel consisting of woven wires of low carbon steel with various components incorporated into the panel to provide greater resistance to cutting.
  • the present invention aims to find a solution for at least some of the above problems.
  • the invention concerns a method for pre-treating a fence panel to be galvanized according to claim 1.
  • the current method is advantageous because the method is focused on the pre-treatment of large fence panels.
  • Pickling takes place in a pickling bath with a reduced concentration of HCl. This reduces the release of environmentally unfriendly acid fumes. This means there is less strong odor nuisance that is unpleasant for the operators.
  • the fence panel is immersed three times in a pickling bath, making degreasing of the fence panel unnecessary. This means that the highly corrosive degreasing chemicals can be avoided. In addition, highly corrosive degreasing chemicals can be avoided.
  • the flux composition is less complex than conventional flux compositions known in the art.
  • the flux composition is also advantageous for use in pre-treating fence panels.
  • the invention concerns a fence panel obtained according to a method according to the first aspect.
  • the fence panel has improved galvanization through hot-dip galvanizing, whereby a thinner zinc layer can be obtained on the fence panel.
  • the invention aims to reduce or even prevent acidification of the rinse water.
  • the invention concerns a method for pre-treating a double-wire fence panel to be galvanized.
  • a segment means one or more segments.
  • Quoting numeric intervals by the endpoints includes all integers, fractions, and/or real numbers between the endpoints, including those endpoints.
  • the method concerns a method for pre-treating a fence panel to be galvanized, comprising the sequential steps of: (i) pickling, (ii) rinsing, (iii) fluxing and (iv) drying a fence panel to be galvanized, wherein during pickling the fence panel (i) is immersed three times in a pickling bath comprising a pickling solution, wherein the pickling solution comprises water, in an amount between 90 and 96 m%, and hydrogen chloride (HCl), in an amount between 2 and 5 m%.
  • the current method is advantageous because pickling takes place in a pickling bath with a reduced concentration of HCl. This reduces the release of environmentally unfriendly acid fumes. This means there is less strong odor nuisance that is unpleasant for the operators.
  • the fence panel is immersed three times in a pickling bath, making degreasing of the fence panel unnecessary. This means that the highly corrosive degreasing chemicals can be avoided.
  • the fence panels are not degreased prior to pickling in step (i). This means that the highly corrosive degreasing chemicals can be avoided. Moreover, an extra rinsing step is thus also unnecessary.
  • the method takes place continuously.
  • the pretreatment is applied to a plurality of fence panels.
  • between 2 and 100 fence panels are pre-treated at the same time, preferably between 10 and 90, more preferably between 20 and 80, even more preferably between 30 and 70, most preferably between 40 and 60.
  • the method takes place continuously, it will be apparent to one skilled in the art that in each step of the method between 2 and 100 fence panels, preferably between 10 and 90, more preferably between 20 and 80, even more preferably between 30 and 70, most preferably between 40 and 60, can be treated simultaneously.
  • the fence panel is made of unalloyed steel, low-alloy steel or high-alloy steel.
  • the fence panel can be manufactured from high or low carbon steel.
  • Unalloyed steel contains a maximum of 1.5% of alloying elements (excluding carbon (C)). Unalloyed steel has a carbon percentage of 0.5% to 2%. Low-alloy steel contains between 1.5 and 5% alloying elements (excluding carbon). High-alloy steel contains more than 5% of alloying elements.
  • the fence panel is preferably made of unalloyed steel.
  • alloying elements refers to the elements that are present in the alloy in addition to iron and carbon. In a preferred form, the fence panel is made of an alloy comprising iron (Fe), carbon (C) and alloying elements.
  • the alloy comprises a maximum of 1.5% alloying elements, more preferably a maximum of 1.4%, even more preferably a maximum of 1.3%, even more preferably a maximum of 1.2%, most preferably a maximum of 1.1%.
  • the alloy comprises at least 0.5% alloying elements, more preferably at least 0.6%, even more preferably at least 0.7%, even more preferably at least 0.8%, even more preferably at least 0.9%, most preferably at least 1%.
  • the alloy comprises between 0.5 and 1.5% alloying elements, preferably between 0.6 and 1.5%, more preferably between 0.7 and 1.4%, even more preferably between 0.8 and 1.3%, even more preferably between 0.9 and 1.2%, most preferably between 1 and 1.1%.
  • the alloy comprises a maximum of 0.1% C, more preferably a maximum of 0.09%, even more preferably a maximum of 0.085%, even more preferably a maximum of 0.08%, most preferably a maximum of 0.075%.
  • the alloy comprises at least 0.025% C, more preferably at least 0.03%, even more preferably at least 0.035%, even more preferably at least 0.04%, most preferably at least 0.045%.
  • the alloy comprises between 0.02 and 0.1% C, preferably between 0.025 and 0.09%, more preferably between 0.035 and 0.085%, even more preferably between 0.04 and 0.08%, most preferably between 0.045 and 0.075%.
  • the alloy comprises alloying elements selected from the list of: manganese (Mn), silicon (Si), sulfur (S), phosphorus (P), nitrogen (N), copper (Cu), chromium (Cr), nickel (Ni), niobium (Nb), tin (Sn), aluminum (Al) or any combination thereof.
  • the alloy comprises manganese (Mn), silicon (Si), sulfur (S), phosphorus (P), nitrogen (N), copper (Cu), and optionally chromium (Cr), nickel (Ni), niobium (Nb), tin (Sn), aluminum (Al).
  • the alloy comprises Mn in an amount between 0.3 and 0.5%, more preferably between 0.35 and 0.45%, Si in an amount between 0.05 and 0.25%, more preferably between 0.1 and 0.2%, S in an amount between 0.01 and 0.045%, more preferably between 0.015 and 0.04%, P in an amount between 0.005 and 0.03%, more preferably between 0.005 and 0.025%, Cu in an amount between 0.2 and 0.4%, more preferably between 0.25 and 0.35%, N in an amount between 0.005 and 0.02%, more preferably between 0.005 and 0.015%, and Cr in an amount of up to 0.15%, more preferably up to 0.1%, Ni in an amount up to 0.15%, more preferably up to 0.1%, and Nb in an amount up to 0.005%, more preferably up to 0.002%, Sn in an amount up to 0.05%, more preferably up to 0.03%, and/or Al in an amount up to 0.005%, more preferably up to 0.003%.
  • the fence panel is a twin-wire or double-wire fence panel.
  • parallel vertical bars also called vertical wires or transverse bars
  • horizontal bars also called horizontal wires or longitudinal bars
  • the fence panel preferably has between 50 and 55, preferably 51, vertical bars and between 1 and 20 horizontal bars.
  • the vertical wires have a length between 500 and 2500 mm, preferably the vertical wires have a length selected from the list: 606, 608, 630, 806, 808, 830, 1006, 1008, 1030, 1206, 1208, 1230, 1406, 1408, 1430, 1606, 1608, 1630, 1806, 1808, 1830, 2006, 2008, 2030, 2206, 2208, 2230, 2406, 2408, 2430 mm. It will be apparent to one skilled in the art that the length of the vertical wires corresponds to the height of a fence panel.
  • the horizontal wires have a length between 2000 and 3000 mm; preferably between 2400 and 2600, even more preferably between 2500 and 2550 mm, most preferably 2508 or 2510 mm. It will be apparent to one skilled in the art that the length of the horizontal wires corresponds to the length of a fence panel.
  • the distance between two adjacent vertical wires is 40-60 mm c.t.c., more preferably between 45 and 55 mm, even more preferably between 49 and 51, most preferably about 50 mm.
  • the distance between the adjacent horizontal wires is 100-300 mm c.t.c., preferably 150-250 mm, more preferably 180-220 mm, most preferably about 200 mm.
  • c.t.c center to center refers to a distance between the center (the heart) of a circular cross-section of a wire and the center (the heart) of a circular cross-section of another wire.
  • the fence panel is immersed three times in a pickling bath in a first step.
  • the fence panel is immersed three times in the same pickling bath or in different pickling baths in a first step.
  • the fence panel is immersed three times in different pickling baths in a first step, even more preferably three different pickling baths.
  • the pickling treatment (pickling) is aimed at removing specific contaminants, such as rust and scale, from the steel surface. Pickling is usually carried out in dilute hydrochloric acid (HCl), where the duration of the pickling process depends, among other things, on the contamination status (e.g. degree of rust formation) of the galvanized material and the acid concentration and temperature of the pickling bath.
  • HCl dilute hydrochloric acid
  • the pickling bath is filled with a pickling solution.
  • the pickling solution comprises, in an amount between 90 and 96 m%, and hydrogen chloride (HCl), in an amount between 2 and 5 m%, preferably between 2.5 and 5 m%, more preferably between 3 and 5 m%, even more preferably between 3.1 and 4.9 m%, even more preferably between 3.2 and 4.8 m%, even more preferably between 3.3 and 4.7 m%, even more preferably between 3.4 and 4.6 m%, even more preferably between 3.5 and 4.5 m%, even more preferably between 3.6 and 4.4 m%, even more preferably between 3.7 and 4.3 m%, most preferably between 3.8 and 4.2 m%.
  • HCl hydrogen chloride
  • pickling continues for a period of time between 8 and 12 minutes, preferably between 8.5 and 11.5 minutes, more preferably between 9 and 11 minutes, most preferably about 10 minutes.
  • pickling continues in three different pickling baths, whereby the fence panel is successively immersed in a first, a second and a third pickling bath.
  • the fence panel is immersed in the first pickling bath for between 2 and 4 minutes, in the second pickling bath for between 3 and 5 minutes and in the third pickling bath for between 2 and 4 minutes.
  • the pH of the pickling baths is a maximum of 3, more preferably a maximum of 2, most preferably a maximum of 1.
  • pickling takes place at a temperature between 20 and 50°C, preferably between 25 and 45°C, more preferably between 30 and 40°C, even more preferably between 31 and 39°C, even more preferably between 32 and 38°C, even more preferably between 33 and 37°C, most preferably about 35°C.
  • the pickling solution further comprises iron(II) chloride (FeCl2).
  • the pickling solution comprises FeCl2, in an amount of up to 5 m% of the pickling solution, preferably in an amount of up to 3 m% of the pickling solution, preferably in an amount of up to 2 m% of the pickling solution, preferably in an amount up to 1 m% of the pickling solution, preferably in an amount of up to 0.5 m% of the pickling solution, preferably in an amount of up to 0.1 m% of the pickling solution.
  • a rinsing process is carried out after the pickling treatment.
  • Rinsing preferably takes place in a rinse bath filled with water.
  • the rinse is a double rinse.
  • the double rinse continues in two successive rinse baths with water.
  • the fence panel is fluxed in an embodiment (flux treatment).
  • the previously pickled steel surface of the fence panel is treated using a so-called flux, which is typically an aqueous solution of inorganic chlorides, usually containing a mixture of zinc chloride (ZnCl2) and ammonium chloride (NH4Cl).
  • a so-called flux typically an aqueous solution of inorganic chlorides, usually containing a mixture of zinc chloride (ZnCl2) and ammonium chloride (NH4Cl).
  • ZnCl2 zinc chloride
  • NH4Cl ammonium chloride
  • the flux is said to increase the wettability between the steel surface and the molten zinc.
  • drying is usually carried out to produce a solid flux film on the steel surface and to remove adhering water, so that unwanted reactions (particularly the formation of water vapor) in the liquid zinc immersion bath are subsequently avoided.
  • fluxing takes place in a flux bath filled with a flux solution.
  • a flux solution is an aqueous solution containing a flux composition.
  • the fence panel is immersed in a flux bath comprising a flux solution comprising a flux composition.
  • the flux solution has a pH between 3 and 8, more preferably between 4 and 7, even more preferably between 5 and 6, most preferably about 5.5.
  • the flux solution comprises water.
  • the flux solution comprises water, in an amount of up to 95 m% of the flux solution, preferably up to 90 m%, more preferably up to 85 m%, most preferably up to 82 m%.
  • the flux solution comprises water, in an amount of at least 65 m%, preferably at least 70 m%, more preferably at least 75 m%, most preferably at least 78 m%.
  • the flux solution comprises water, in an amount between 65 and 95 m%, preferably between 70 and 90 m%, more preferably between 75 m% and 85 m%, most preferably between 78 and 82 m%.
  • the flux solution comprises a flux composition.
  • the flux solution comprises a flux composition, in an amount of up to 35 m% of the flux solution, preferably up to 30 m%, more preferably up to 25 m%, most preferably up to 22 m%.
  • the flux solution comprises a flux composition, in an amount of at least 5 m% of the flux solution, preferably at least 10 m%, more preferably at least 15 m%, most preferably at least 18 m%.
  • the flux solution comprises a flux composition, in an amount between 5 and 35 m% of the flux solution, preferably between 10 and 30 m%, more preferably between 15 m% and 25 m%, most preferably between 18 and 22 m%.
  • the flux composition comprises ammonium chloride (NH4Cl) and zinc chloride (ZnCl2).
  • the flux composition comprises ammonium chloride (NH4Cl) in an amount of up to 70 m% of the flux composition, preferably up to 65 m%, more preferably up to 60 m%, most preferably up to 56 m%.
  • the flux composition comprises ammonium chloride (NH4Cl), in an amount of at least 40 m% of the flux composition, preferably at least 45 m%, more preferably at least 50 m%, most preferably at least 52 m%.
  • the flux composition comprises ammonium chloride (NH4Cl), in an amount between 40 and 70 m% of the flux composition, preferably between 45 and 65 m%, more preferably between 50 m% and 60 m%, most preferably between 52 and 56 m%.
  • ammonium chloride (NH4Cl)
  • Ammonium chloride improves the wettability of the surface of the article by molten zinc and thereby promotes the formation of an even, continuous, void-free coating.
  • the flux composition comprises zinc chloride (ZnCl2) in an amount of up to 60 m% of the flux composition, preferably up to 55 m%, more preferably up to 50 m%, most preferably up to 48 m%.
  • the flux composition comprises zinc chloride (ZnCl2), in an amount of at least 30 m% of the flux composition, preferably at least 35 m%, more preferably at least 40 m%, most preferably at least 44 m%.
  • the flux composition comprises zinc chloride (ZnCl2), in an amount between 30 and 60 m% of the flux composition, preferably between 35 and 55 m%, more preferably between 40 m% and 50 m%, most preferably between 44 and 48 m%.
  • ZnCl2 zinc chloride
  • the flux composition comprises ammonium chloride (NH4Cl) and zinc chloride (ZnCl2), in a weight ratio of maximum 70/30, preferably maximum 65/35, more preferably maximum 60/40, even more preferably maximum 56/44, most preferably about 54/46.
  • the flux composition comprises ammonium chloride (NH4Cl) and zinc chloride (ZnCl2), in a weight ratio of at least 40/60, preferably at least 45/55, more preferably at least 50/50, even more preferably at least 52/48, most preferably about 54/46.
  • the flux composition comprises ammonium chloride (NH4Cl) and zinc chloride (ZnCl2), in a weight ratio between 70/30 and 40/60, preferably between 65/35 and 45/55, more preferably 60/40 and 50/50, even more preferably between 56/44 and 52/48, most preferably about 54/46.
  • ammonium chloride (NH4Cl)
  • zinc chloride ZnCl2
  • Both zinc chloride and ammonium chloride are excellent reducing agents and clean metal very efficiently in the temperature range required for soldering.
  • the flux composition consists of ammonium chloride (NH4Cl), in an amount between 40 and 70 m% of the flux composition, preferably between 45 and 65 m%, more preferably between 50 m% and 60 m%, most preferably between 52 and 56 m%, and zinc chloride (ZnCl2) in an amount between 30 and 60 m% of the flux composition, preferably between 35 and 55 m%, more preferably between 40 m% and 50 m%, most preferably between 44 and 48 m%.
  • ammonium chloride (NH4Cl)
  • ZnCl2 zinc chloride
  • the flux composition consists of:
  • the flux composition consists of:
  • the flux composition consists of:
  • the fence panel is immersed in the flux bath for 120-300 seconds, preferably 130-290 seconds, more preferably 140-280 seconds, even more preferably 150-270 seconds, even more preferably 160-260 seconds and most preferably between 170-250 seconds.
  • the fluxed fence panels are dried.
  • drying takes place in an oven.
  • the fence panels are dried in an oven at an air temperature between 120 and 140°C, preferably between 125 and 135°C.
  • the fence panels are dried in an oven for a period of time between 10 and 25 minutes, preferably between 15 and 20 minutes.
  • the fence panel is then galvanized, preferably hot-dip galvanized.
  • the invention concerns a fence panel
  • a pre-treated fence panel obtained by a method according to the first aspect obtained by a method according to the first aspect.
  • the fence panel has improved galvanization through hot-dip galvanizing, whereby a thinner zinc layer can be obtained on the fence panel.
  • Figure 1 shows a schematic representation of a specific embodiment of the method described herein for pre-treating a fence panel to be galvanized.
  • the method involves pre-treating a fence panel to be galvanized.
  • the method comprises, in a first step, pickling (1) the fence panel.
  • the fence panel is immersed three times (1', 1", 1"') in three different pickling baths containing a 4 m% aqueous HCl solution as pickling solution.
  • the fence panel is then rinsed in a second step (2).
  • Rinsing (2) is done by immersing the pickled fence panel twice (2', 2") in a rinse bath filled with water.
  • the fence panel is then fluxed in a third step (3) by immersion in a flux bath comprising 20 m% of a flux composition dissolved in water, the flux composition comprising 46 m% ZnCl2 and 54 m% NH4Cl.
  • the fence panel is dried (4) in an oven with air temperature 130°C.
  • Figure 2 and Figure 3 show a double-wire fence panel that can be pre-treated according to the method of the first aspect.
  • Figure 2 shows a perspective view of a double-wire fence panel.
  • Figure 3 shows an enlarged perspective view of a double-wire fence panel (section A in Figure 2 ).
  • a twin-wire fence panel (108) consists of parallel vertical wires (104) welded to horizontal wires (101, 102) with the vertical wires welded at any height between two horizontal wires (101, 102) forming a double pair (103).
  • the distance between two adjacent vertical wires (106) is about 50 mm c.t.c.
  • the distance between the adjacent horizontal wires (105) is about 200 mm c.t.c.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Coating With Molten Metal (AREA)
EP23192614.8A 2022-08-22 2023-08-22 Verfahren zur vorbehandlung einer zu verzinkenden zaunplatte und eine vorbehandelte zaunplatte Pending EP4328345A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE20225654A BE1030796B1 (nl) 2022-08-22 2022-08-22 Werkwijze voor het voorbehandelen van een te verzinken hekwerkpaneel en voorbehandeld hekwerkpaneel

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EP4328345A1 true EP4328345A1 (de) 2024-02-28

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010081905A1 (en) 2009-01-16 2010-07-22 Galva Power Group N.V. Flux and fluxing bath for hot dip galvanization, process for the hot dip galvanization of an iron or steel article
GB2480913A (en) 2010-05-28 2011-12-07 Betafence Ltd Security fencing panel
EP2725115A1 (de) 2012-10-25 2014-04-30 Fontaine Holdings NV Flussmittelzusammensetzungen zur Stahlverzinkung
EP3663429A1 (de) 2016-06-13 2020-06-10 Fontaine Holdings NV Anlage für die feuerverzinkung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010081905A1 (en) 2009-01-16 2010-07-22 Galva Power Group N.V. Flux and fluxing bath for hot dip galvanization, process for the hot dip galvanization of an iron or steel article
GB2480913A (en) 2010-05-28 2011-12-07 Betafence Ltd Security fencing panel
EP2725115A1 (de) 2012-10-25 2014-04-30 Fontaine Holdings NV Flussmittelzusammensetzungen zur Stahlverzinkung
EP3663429A1 (de) 2016-06-13 2020-06-10 Fontaine Holdings NV Anlage für die feuerverzinkung

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BE1030796A1 (nl) 2024-03-15
BE1030796B1 (nl) 2024-03-18

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