Method for reprocessing used, galvanized steel parts that have a zinc layer, and apparatus for this purpose

Abstract

Method for reprocessing used, galvanized steel parts (10) having a zinc layer, comprising the following steps: A) Checking the used, galvanized steel part (10) for suitability for reprocessing, including determining whether a zinc layer is present; B) mechanical and / or chemical preparation of the used, galvanized steel part (10); C) Regenerating the zinc layer of the steel part (10) comprising applying an additional zinc layer to the existing, entire zinc layer of the steel part (10) so that the zinc layer is restored and an intended minimum value of layer thickness for the restored zinc layer is achieved; and D) Measuring the thickness of the restored zinc layer.

Description

Subject matter of the invention

[0001] The present invention relates to a method for reprocessing used, galvanized steel parts having a zinc layer, and to a device for this purpose. State of the art

[0002] Galvanized steel parts are used in a wide variety of applications. It is well known that vehicle body parts have long been galvanized for corrosion protection. Similarly, scaffolding components or guardrails of vehicle restraint systems, also known as crash barriers, as well as other components of such systems, are galvanized to significantly increase their service life. These components are exposed to considerable environmental influences during their use. In addition to weathering over their service life, such components are also subject to corrosion processes, which can be intensified by reagents present in the immediate environment, for example, due to air pollution, particularly from vehicle exhaust fumes. Corrosion processes can also be caused by substances deliberately applied to the road surface. These include, for example, salts, which are used especially in cold climates to prevent snow and / or ice from forming on the road.Such salts can create particularly aggressive environmental conditions to which steel components, such as those in vehicle restraint systems, are exposed. In addition to chemical stresses, mechanical stresses can also occur, sometimes causing considerable deformation of these components. Consider, for example, the components of vehicle restraint systems on roadways, which are deformed by vehicle collisions. Particularly after minor collisions, the mechanical strength of the component may still be sufficient to meet required safety standards. However, a corrosion layer applied to the guardrail of the vehicle restraint system may be at least partially damaged.

[0003] Guardrail components may be required when a new road, a so-called new construction, is built. Furthermore, guardrail components may be needed when a new obstacle, such as a motorway rest area, is created, or when the road surface is renewed and the guardrail components are replaced as part of this process. In this case, it is also referred to as a retrofit. Additionally, guardrail components may be required after an accident when deformed components need to be replaced.

[0004] Although it was already common practice in the past to dispose of galvanized steel parts, such as guardrail components, after use or damage not solely as scrap steel with its zinc coating in a blast furnace, but rather, where appropriate, to subject them to an improved recycling cycle in which they were stripped of their zinc coating if necessary and then re-galvanized, there is a need for such components to be reprocessed with less effort and then reused as intended. In particular, for reasons of sustainability, it is desirable to avoid the complex process of completely melting down the galvanized steel parts, which involves, for example, high energy consumption and numerous work steps.However, even if galvanized steel parts are completely stripped of their zinc coating after use or damage as part of the state of the art in the recycling cycle, and then possibly mechanically reprocessed and subsequently recoated or galvanized, the associated reprocessing is extremely complex and environmentally damaging. What applies here to guardrail components also applies to all areas with galvanized steel elements or parts. Examples include lattice tower construction and greenhouse construction.

[0005] DE 10 2016 106 756 A1 relates to a thermospraying process for a corrosion protection layer. It is disclosed that two or more body components are first joined together or a new surface is created by machining at least one body component, and that the corrosion protection layer is then applied to the joined or machined surface by thermospraying a thermospray.

[0006] An article by the German Galvanizing Association (Industrieverband Feuerverzinken eV) entitled "Hot-dip galvanized steel in the sustainable circular economy" from May 2021 reveals that already hot-dip galvanized components can undergo a so-called "remake." In such a remake, a hot-dip galvanized component is first completely dezincified and then subsequently re-galvanized.

[0007] WO 2006 / 091 070 A1 discloses a method for treating pre-made metal objects in the form of blanks, wherein the metal objects are first subjected to a shot peening process and then coated with a zinc layer.

[0008] AU 1 993 051 763 A1 discloses a method for maintaining or preserving a flux bath in a flux station of a galvanizing line, wherein a dezincification station is located upstream of the flux station.

[0009] An article by the German Galvanizing Association (Industrieverband Feuerverzinken eV) entitled “Surface requirements for the finished part” from May 2021 reveals that, in the case of steel parts that already have one or more corrosion protection coatings, such old coatings must be consistently removed by blasting, grinding or paint stripping.

[0010] An article by the German Galvanizing Association (Industrieverband Feuerverzinken eV) entitled “Process flow in hot-dip galvanizing according to DIN EN ISO 1461” from May 2021 explains this process flow.

[0011] DE 31 17 982 A1 relates to the punching of galvanized profiles, a subsequent blasting and lapping of the punched, free profile surfaces and the subsequent re-galvanizing of the punched profile surfaces.

[0012] US 5,035,042 A discloses a method for the continuous forming of electroplated tubes. In this process, a tube shape is first created from an electroplated metal strip by bending. Adjacent edges of the metal strip are then welded together to close the tube shape. The resulting tube is then cleaned, the weld is finished, and it is coated with molten zinc.

[0013] An article by the German Galvanizing Association (Industrieverband Feuerverzinken eV) entitled “Professional Repair” from August 2020 reveals that local defects in a galvanized steel part can be repaired locally by thermal spraying with zinc or by applying zinc dust or solder with zinc.

[0014] JP S59 - 173 253 A discloses a first plating of a steel strip with zinc, a subsequent chemical treatment of the resulting zinc layer by means of a flux bath, and a subsequent hot-dip plating in a zinc bath. Task

[0015] The object of the present invention is to provide a method and a device of the type described above which enable a simple yet high-quality reprocessing of used galvanized steel parts. Solution and further developments according to the present invention

[0016] The aforementioned problem is solved by a method according to claim 1 and a device according to claim 11.

[0017] The invention relates to a method for reprocessing used, galvanized steel parts having a zinc layer, comprising the following steps: A) Checking the used, galvanized steel part for suitability for reprocessing, including determining whether a zinc layer is present; B) mechanical and / or chemical preparation of the used, galvanized steel part; C) Regenerating the zinc coating of the steel part, comprising applying an additional zinc coating to the existing, entire zinc coating of the steel part, so that the zinc coating is restored and an intended minimum coating thickness for the restored zinc coating is achieved; and D) Measuring the thickness of the restored zinc layer.

[0018] In this way, simple yet high-quality reprocessing of galvanized steel parts can be achieved. Completely melting down the galvanized steel part and / or completely removing the zinc coating is unnecessary. Instead, the galvanized steel part, including its original zinc coating—even if it is completely or partially damaged—can be reused. This allows the protective effect of the remaining original zinc layer to contribute to the protection of the newly galvanized steel part. Overall, this results in cost savings. Furthermore, a high degree of sustainability can be achieved because energy-intensive (melting down) and environmentally harmful (complete removal of the zinc coating) process steps can be avoided.

[0019] According to the invention, step C) involves regenerating the zinc layer of the steel part by at least partially applying a new, additional zinc layer to the existing zinc layer. This application can be carried out by immersing the steel part in a molten metal, particularly one with a high zinc content. Alternatively, the application can be carried out by spraying, dabbing, or coating the steel part with a zinc-impregnating agent. Furthermore, the application can also include other methods, such as thermal diffusion or mechanical processes. The additional zinc layer can also comprise a layer of zinc, a zinc-containing alloy, or a zinc-containing carrier material.

[0020] It should be noted that the term "regeneration of the zinc layer" can also refer to the restoration of the zinc layer.

[0021] According to one embodiment of the invention, it can be provided that, based on step A), partial steps and / or the required scope of steps B) and / or C) are determined. The process can thus be adapted to the observed condition of the steel part and the remaining galvanizing as it progresses, based on the inspection of the steel part and the remaining galvanizing.

[0022] Furthermore, in a further development of the inventive method, it is provided that in step A) the galvanized steel part is checked with regard to at least one of the following properties: - Type of existing zinc layer: Types of existing zinc layer include, in particular, hot-dip galvanizing, spray galvanizing, sheradizing, diffusion galvanizing, galvanizing by zinc flakes or binder systems, electrogalvanizing, mechanical galvanizing and film galvanizing; furthermore, the type of zinc-iron phases can be checked. - Condition of the existing zinc layer: The condition of the existing zinc layer may include a local layer thickness and / or an areal distribution of the layer thickness and / or an average layer thickness on the steel part and / or a characteristic value that includes the degree of deviation from an average layer thickness; furthermore, the condition of the zinc layer may relate to an extent of corrosion of the existing zinc layer and / or the presence of a specific zinc-iron phase; - Degree of pollution; - Concentration of deposits, especially salts, oxides, hydroxides, greases, etc.: This can be particularly advantageous for selecting subsequent preparation steps for the steel parts, such as cleaning processes; - Type of deposits, especially salts, oxides, hydroxides, fats, etc.; - Deformation of the steel part compared to its original shape; - Type of corrosion of the steel part; - Degree of corrosion of the steel part; - Wear and tear of the steel part; - Material thickness of the steel part; - Marking of the steel part: The marking may be an original manufacturer's mark, a CE marking, or a stamp; furthermore, the marking of the steel part may be a type of serial number; the marking may include traceability of the raw material, the manufacturing period, or the manufacturer of the steel part; - Presence of a fastening option or fastening element, in particular a bore and / or a thread and / or a hole and / or a slot and / or a screw or bolt or other fastening elements; - Condition of a fastening option, in particular a bore and / or a thread and / or a hole and / or a slot; - Color of the steel part; - Presence of foreign coating materials; - Material and / or material quality of the steel part.

[0023] According to further training, it may be stipulated that in step A), at least one of the aforementioned properties or parameters is used to determine whether or not a part is suitable for reprocessing. For example, severe deformation and / or a high degree of corrosion and / or high wear of the steel part and / or poor condition of fastening points could be exclusion criteria that prevent reprocessing. Such a severely damaged steel part could then be rejected and not subjected to the subsequent process steps B and C. It may then be stipulated that the rejected steel part be recycled using conventional methods.For example, if it is determined that the steel is already so corroded that a predetermined maximum value of, say, 30% corrosion-related loss is exceeded, it is not suitable for reprocessing. According to another example, suitability for reprocessing may be deemed to exist if a minimum dimension is not met, calculated as the thickness of the steel minus a manufacturing tolerance. For example, the thickness of the steel may be 3 mm and the manufacturing tolerance ±0.17 mm, so the minimum dimension is 3.00 mm - 0.17 mm = 2.83 mm.

[0024] It should be noted that, according to the invention, in step A), checking the galvanized steel part for suitability for reprocessing includes at least determining whether a galvanized steel part is present at all. Furthermore, the check in step A) can include determining whether the galvanized steel part falls below a maximum permissible steel part size and / or exceeds a minimum permissible steel part size. A minimum and / or maximum steel part size can be specified for processing, for example, by plant parameters.

[0025] According to further training, it may be provided that, after step A), the type of existing zinc layer is used to determine how or by which method the zinc layer is regenerated.

[0026] According to a further inventive concept, it can be provided that, after step A), the extent of regenerating the zinc layer of the steel part is determined based on the condition of the existing zinc layer.

[0027] According to a further development of the method according to the invention, it can be provided that in step A) the manufacturer and / or material of the steel part are determined based on the marking of the steel part. For example, it can be provided that only steel parts from certain manufacturers and / or of certain materials are suitable for reprocessing. Furthermore, the marking can be decisive in determining whether and to what extent a warranty can be given for the reprocessed steel parts. Additionally, the reprocessed steel parts can be re-marked based on the determined marking.

[0028] According to a further development of the invention, step A) can be carried out by means of at least one optical and / or mechanical and / or inductive and / or electrical and / or chemical measuring device, in particular a camera, and / or by visual inspection, in particular manual inspection of the geometry of the galvanized steel part using gauges or templates to check for dimensional accuracy and / or suitability. The measuring device can be a mechanical probe that, for example, checks the geometry and / or material thickness of the steel part. The measuring device can also be based on an inductive and / or electrical measuring method, such as an eddy current method, that detects the condition of the zinc coating. A chemical measuring device can, for example, determine the type of deposits and / or corrosion on the steel part.If it is determined that the galvanized steel part is not suitable for reprocessing, the steel part can be sorted out so that it is not subjected to steps B) and C).

[0029] According to further training, it may be necessary to perform a preliminary cleaning of the steel part in step A). ​​This serves to remove easily removable contaminants. This exposes the surface of the steel part and thus the existing zinc coating. This is also important for measuring the geometry, where the component itself, and not the contaminants, should be measured. This makes it easier to check the condition and / or properties of the steel part and / or the zinc coating, and thus its suitability for reprocessing. Furthermore, this facilitates the execution of the subsequent process steps B) and / or C).

[0030] According to a further development of the present invention, it can be provided that, after step A), the steel parts are sorted or categorized into groups. This can be done, for example, based on the verified properties. This can be advantageous in order to group steel parts that require similar reprocessing for subsequent reprocessing steps.

[0031] According to further training, it may be stipulated that, following step A), the inspected properties are used to determine how and with which sub-steps steps B) and / or C) are carried out. For example, the concentration of deposits can be used to determine the intensity of the preparation. Furthermore, the type of deposits can be used to determine the necessary preparation steps. Additionally, the condition of at least one fastening point can be used to determine whether a new and / or a refurbished fastening point is introduced in an additional processing step.

[0032] According to a further aspect of the invention, step B) may include a partial step of cleaning the galvanized steel part. This can serve to remove contaminants. This exposes the surface of the steel part and thus the existing zinc layer. The so-called residual zinc layer, i.e., the remaining zinc layer, is thus exposed. It should be noted that cleaning may also be provided in step C). However, this cleaning primarily serves the chemical preparation for galvanizing and is therefore not discussed in more detail here.

[0033] In this context, according to the invention, it can be provided that the cleaning process comprises at least one of the following cleaning steps: - at least partial treatment of the galvanized steel part by abrasive blasting using an abrasive material, for example sandblasting or water jetting, in particular high-pressure water jetting, or dry ice blasting; the abrasive material can be, for example, sand, corundum, water, dry ice and / or steel. An advantage of blasting with steel would be the possible subsequent separation of the abrasive material and the galvanizing by magnetic force. - at least section-by-section treatment of the galvanized steel part by grinding or brushing, - at least section-by-section treatment of the galvanized steel part by applying a cleaning substance, - at least partial immersion of the galvanized steel part in a cleaning bath, - at least partial treatment of the surface of the galvanized steel part using a laser.

[0034] Abrasive cleaning, such as sandblasting and waterjet cleaning, is particularly useful for removing stubborn dirt. Sandblasting and grinding are particularly useful for removing existing corrosion from the steel part and / or the existing zinc coating. Cleaning agents are particularly useful for loosening, softening, or removing dirt. The same applies to laser treatment. Immersion in a cleaning bath is particularly useful for loosening or softening water-soluble or foreign contaminants.

[0035] According to an advantageous embodiment of the invention, step B) may comprise the following sub-steps: - Measuring the galvanized steel part for deviations from target dimensions, - Check whether the deviations are within specified tolerances, - Corrective deformation of the galvanized steel part in case of deviations outside the specified tolerances.

[0036] Corrective forming ensures that the galvanized steel part achieves target dimensions within specified tolerances. To minimize stress on the galvanized steel part, corrective forming should be performed to the smallest, but necessary, extent. Measurement can also serve to record and document the current state of the galvanized steel part.

[0037] In this context, a further development of the invention may provide that, after the corrective forming or after step C), a new marking, for example an embossing, a perforation, a serial number and / or a mark, is applied to the steel part, which can indicate additional data such as the reprocessing date and / or data of the reprocessor or manufacturer. This new marking may be a manufacturer's mark and / or a reprocessing mark and / or a mark indicating properties of the reprocessing and / or the reprocessing date and / or a quality seal and / or a legally required mark, in particular a CE marking, and / or a material mark.

[0038] In this context, a further development of the invention provides that the step of corrective deformation comprises at least one of the following steps: - Cold forming by pressing; - Cold forming by rolling, in particular flat rolling or profile rolling; - Cold forming by bending; - Re-punching of drilled holes and / or slots and / or elongated holes; - Adding holes; - Thread cutting.

[0039] It can happen that galvanized steel parts processed according to the present invention have unsuitable spacing for fastening elements. This can occur, for example, if industry standards or customer requirements have changed in the meantime. Post-punching allows a galvanized steel part to be adapted to current standards or customer requirements. This increases the number of galvanized steel parts suitable for treatment, which can have a positive impact on the process's cost-effectiveness. It also allows for increased recyclability of already galvanized steel parts and thus greater sustainability. In the case of guardrails, it may be necessary to post-punch holes at 1000 mm intervals, thereby supplementing an existing set of holes at 1333 mm intervals.

[0040] Furthermore, according to the invention, it can be provided that step C) comprises at least one of the following sub-steps: - Cleaning the galvanized steel part; - Pickling of the galvanized steel part using a pickling agent, in particular a zinc-containing acid or hydrochloric acid, - Rinsing the galvanized steel part in a water bath, - Fluxing of the galvanized steel part, in particular immersion of the galvanized steel part in a flux, preferably in an aqueous salt solution, - Drying of the galvanized steel part, - Post-galvanizing of the steel part, in particular by immersing the galvanized steel part in a zinc bath, - Post-processing of the newly galvanized steel part, in particular cooling of the newly galvanized steel part.

[0041] Cleaning may include necessary pretreatment, particularly wet chemical treatment, before re-galvanizing the steel part. This cleaning may involve degreasing with a degreasing agent and / or rinsing with water. Suitable degreasing agents include aqueous alkaline or acidic agents. Rinsing with water serves to prevent any potential carryover of the degreasing agent into a subsequent process or bath, such as a galvanizing bath.

[0042] Pickling is primarily used to remove inherent contaminants such as rust and scale. Depending on the extent of the contamination, the pickling time and / or the concentration of the pickling agent can be adjusted. The pickling agent may be supplied at a specific temperature to optimize the pickling process. Suitable pickling agents include, among others, hydrochloric acid (HCl) with an acid content between 1% and 18%, and, depending on the application, with a salt load of iron and / or zinc salts.

[0043] Rinsing serves to prevent any potential carryover of the pickling agent. Rinsing can be repeated to achieve a particularly thorough cleaning. This further reduces the risk of pickling agent carryover.

[0044] Fluxing is used to perform a fine cleaning of the steel part with a flux. Furthermore, the flux serves to increase the wettability between the steel part and the zinc to be applied. The flux can be an aqueous salt solution, an aqueous chloride solution, for example, a mixture of zinc and ammonium chloride.

[0045] Pre-drying serves to dry the flux, which facilitates the subsequent galvanizing process. This can be done in a drying oven or by air drying.

[0046] Post-galvanizing of the steel part serves to apply an additional zinc layer to the steel part. The zinc bath may be maintained at a predetermined temperature, preferably in the range of 400 °C to 620 °C, and particularly preferably in the range of 440 °C to 460 °C. The zinc bath may have a predetermined zinc content, preferably at least 98.5%. The post-galvanizing process may be designed to form a zinc layer in accordance with a standard, regulation, or guideline. DIN EN ISO 1461 serves as a non-restrictive example.

[0047] The post-treatment of a newly galvanized steel part serves to cool it. This can be done in air or in a water bath. Furthermore, post-treatment can include passivation, which can maintain the gloss, prevent white rust, or even serve as a base for subsequent coating.

[0048] According to a further development of the invention, it can be provided that in step C) the zinc layer thickness determined in step A) is used to determine properties of step C). In particular, it can be provided that the zinc layer thickness determined in step A) is used to determine a layer thickness of the additional zinc layer applied by re-galvanizing. If the existing zinc layer already corresponds to a predetermined value, for example, a minimum value required by law or standard, or a value according to a customer requirement, the additional zinc layer can be thin or even omitted. If the existing zinc layer is below the predetermined value, the additional zinc layer can at least correspond to this value.The layer thickness used can be the local layer thickness and / or the area distribution of the layer thickness and / or the average layer thickness on the steel part and / or the characteristic value that indicates the degree of deviation from an average layer thickness.

[0049] The invention makes it possible to ensure that the thickness of the entire zinc layer, i.e., both the existing and the additional zinc layer, corresponds to a necessary minimum value. This results in cost savings. Furthermore, it is possible to conserve resources by minimizing zinc usage. Additionally, the weight of the reprocessed steel part can be kept low. For example, it is possible to restore the weight of the original galvanized steel part because only the required, missing zinc layer thickness is added. This design is particularly advantageous if galvanized steel parts can be grouped for treatment based on similar properties, especially the condition of the zinc layer.

[0050] According to one aspect of the invention, the galvanized steel parts are preferably cold-formed or hot-rolled steel parts, in particular used guardrail components of vehicle restraint systems or parts thereof, or used scaffolding parts, or used steel beams, or body parts of vehicles, or used temporary structures, or galvanized substructures of, for example, greenhouses, or, for example, trapezoidal roof coverings, or sheet piles. Overall, the method is thus highly versatile. Essentially, the galvanized steel part can be any galvanized steel part. For example, the galvanized steel part can have the shape of a tube, an angle, a polygon, a flat part, or a combination of different geometries.

[0051] According to one embodiment of the invention, the galvanized steel part can be composed of several individual parts, preferably several identical individual parts, and particularly preferably several individual parts connected with or without fasteners or plug connections. These individual parts can be used guardrail components from vehicle restraint systems or parts thereof, or used scaffolding components, or used steel beams, or vehicle body parts, or used temporary structures, or galvanized substructures of, for example, greenhouses, or, for example, trapezoidal roof coverings, or sheet piles. In the case of used guardrail components from vehicle restraint systems, for example, two or more guardrail components can be connected to one another.The two or more guardrail components can be connected to each other in the same way as they would be during normal use. Specifically, for example, two guardrail components can overlap completely and be firmly connected to each other using screws or rivets, perhaps to form a pre-assembled unit.

[0052] This approach is advantageous because the individual parts do not undergo the processing procedure individually, but rather as a unit, i.e., in a connected state. This approach thus has the advantage of requiring fewer individual parts for processing. This increases throughput and therefore efficiency, which can also have a positive impact on the processing time and overall cost-effectiveness. Furthermore, it is advantageous that all individual parts are processed. In the case of two guardrail components that are already connected, this assembled unit can be preserved, and the fasteners that join the two guardrail components are also processed. This approach is limited by the maximum permissible dimensions for the process or its individual steps or sub-steps.Another advantage is that the subsequent application of fasteners at the point of use is either unnecessary or requires fewer fasteners. This avoids or at least reduces the risk of damaging the zinc coating of the steel part.

[0053] According to the invention, it is provided that after step C) a step D) follows, which comprises: - Measuring the thickness of the zinc layer.

[0054] Step D) can be used to document and ensure the coating thickness for quality assurance purposes. This may be necessary if, for example, the galvanizing is to comply with the specifications of a standard, regulation, or guideline. DIN EN ISO 1461 serves as a non-restrictive example. The coating thickness is understood to be the thickness of the entire zinc layer, i.e., the existing and any additional zinc layers.

[0055] According to further training, it may be provided that after step C) a new marking is applied to the reprocessed steel part, preferably in a step D). This new marking may be a manufacturer's mark and / or a mark indicating the reprocessing and / or a mark indicating properties of the reprocessing and / or the time of reprocessing and / or a quality seal and / or a legally required mark, in particular a CE marking, and / or a material mark.

[0056] According to one aspect of the invention, it can be provided that individual steps and / or sub-steps of the process are repeated multiple times on a galvanized steel part. For this purpose, an additional step of checking whether the preceding step was successful can be provided after each step or sub-step of the process. For example, it can be provided that the cleaning of the galvanized steel part in step B) is carried out again. Furthermore, it can be provided, for example, that the corrective deformation step is repeated if it is determined that the preceding corrective deformation was unsuccessful or at least insufficient.

[0057] The aforementioned problem is further solved by a device for reprocessing used, galvanized steel parts that have a zinc coating and for carrying out the process of one of the types described above. It can therefore be provided that the device is configured to carry out the process of the type described above and has corresponding spatial and physical features designed to execute the process.

[0058] The device according to the invention comprises the following stations: - a station for checking the used, galvanized steel part for suitability for reprocessing, including determining whether a zinc layer is present; - a station for the mechanical and / or chemical preparation of the used, galvanized steel part; - a station for regenerating the zinc layer of the steel part by applying an additional zinc layer to the existing, entire zinc layer of the steel part, so that the zinc layer is restored and an intended minimum value of layer thickness for the restored zinc layer is achieved.

[0059] The system may include substations for each station. For example, the mechanical and chemical preparation stations may be comprised of different, and in particular spatially separated, substations. The stations may be arranged spatially apart from one another. Furthermore, the stations may be connected by conveyors. It may also be possible for the stations to form a production line, with galvanized steel parts to be processed being fed into the line at one end and reprocessed steel parts being provided at the other.

[0060] In a further development of the invention, it may be provided that in the station for checking the suitability of the galvanized steel part for reprocessing, the galvanized steel part is checked with regard to at least one of the following properties: - Type of existing zinc layer; - Condition of the existing zinc layer; - Degree of pollution; - Type of deposits, especially salts, oxides, hydroxides, fats; - Concentration of deposits, especially salts, oxides, hydroxides, fats; - Deformation of the steel part compared to its original shape; - Type of corrosion of the steel part; - Degree of corrosion of the steel part; - Wear and tear of the steel part; - Material thickness of the steel part; - Marking of the steel part; - Presence of a fastening option, in particular a bore and / or a thread and / or a hole and / or a slot; - Condition of a fastening option, in particular a bore and / or a thread and / or a hole and / or a slot; - Color of the steel part; - Presence of foreign coating materials; - Material and / or material quality of the steel part;

[0061] The marking may be an original manufacturer's mark, a CE marking, or a stamp; furthermore, the marking of the steel part may be a type of serial number; the marking may include traceability of the starting material, the manufacturing period, or the manufacturer of the steel part.

[0062] The respective check can be carried out in one substation or in several substations.

[0063] Furthermore, the station for checking the suitability of the galvanized steel part for reprocessing may include an optical and / or mechanical and / or inductive and / or electrical and / or chemical measuring device, in particular a camera, and / or an area for visual inspection, in particular for manually checking the geometry of the galvanized steel part for dimensional accuracy and suitability using gauges or templates. The measuring device may be a mechanical probe that, for example, checks the geometry and / or material thickness of the steel part. The measuring device may also be based on an inductive and / or electrical measuring method, such as an eddy current method, that detects the condition of the zinc coating. A chemical measuring device may, for example, determine the type of deposits and / or corrosion present on the steel part.If the inspection is carried out in different ways, for example visually and mechanically, several sub-stations may be set up. If it is determined that the galvanized steel part is not suitable for reprocessing, the steel part can be sorted out so that it is not sent to steps B) and C).

[0064] According to further training, a sub-station for pre-cleaning the galvanized steel part can be included in the station for checking its suitability for reprocessing. This sub-station can be used to remove contaminants, thereby exposing the surface of the steel part and thus the existing zinc coating. This facilitates subsequent inspection of the condition and / or properties of the steel part and / or the zinc coating, and thus its suitability for reprocessing.

[0065] According to an optional aspect of the invention, a sorting station for the galvanized steel parts into groups may be provided following the station for checking their suitability for reprocessing. The sorting can be carried out, for example, based on the checked properties. This can be advantageous for grouping steel parts requiring similar reprocessing for subsequent reprocessing steps.

[0066] According to a further development of the invention, the station for the mechanical and / or chemical preparation of the galvanized steel part comprises a sub-station for cleaning the galvanized steel part, wherein the sub-station for cleaning the galvanized steel part performs at least one of the following cleaning steps: - at least section-by-section blasting of the galvanized steel part using an abrasive material, for example sandblasting or water blasting, in particular high-pressure water blasting, or dry ice blasting - at least section-by-section treatment of the galvanized steel part by grinding or brushing, - at least section-by-section treatment of the galvanized steel part by applying a cleaning substance, - at least partial immersion of the galvanized steel part in a cleaning bath, - at least partial treatment of the surface of the galvanized steel part using a laser.

[0067] The individual cleaning steps can be implemented in different sub-stations.

[0068] A further development of the invention provides that the station for the mechanical and / or chemical preparation of the galvanized steel part comprises at least one sub-station for measuring the galvanized steel part for deviations from target dimensions, furthermore at least one sub-station for checking whether the deviations are within specified tolerances, and furthermore at least one sub-station for corrective deformation of the galvanized steel part in the event of deviations outside the specified tolerances.

[0069] According to one aspect of the invention, the station for the mechanical and / or chemical preparation of the galvanized steel part comprises a sub-station that performs at least one of the following steps: - Measuring the galvanized steel part for deviations from target dimensions, - Check whether the deviations are within specified tolerances, - Corrective deformation of the galvanized steel part in case of deviations outside the specified tolerances.

[0070] Individual steps can be trained in different sub-stations.

[0071] In this context, it may be provided that the sub-station for corrective deformation is designed to deform the galvanized steel part after at least one of the following sub-steps: - Cold forming by pressing, - Cold forming by rolling, in particular flat rolling or profile rolling, - Cold forming by bending - Re-punching of drilled holes and / or slots and / or elongated holes; - Adding holes; - Thread cutting.

[0072] Furthermore, according to one embodiment of the invention, the station for regenerating the zinc layer of the steel part may comprise at least one sub-station which is designed to carry out at least one of the following sub-steps: - Cleaning the galvanized steel part; - Pickling of the galvanized steel part using a pickling agent, in particular a zinc-containing acid or hydrochloric acid, - Rinsing the galvanized steel part in a water bath, - Fluxing of the galvanized steel part, in particular immersion of the galvanized steel part in a flux, preferably in an aqueous salt solution, - Drying of the galvanized steel part, - Post-galvanizing of the steel part, in particular by immersing the galvanized steel part in a zinc bath, - Post-processing of the newly galvanized steel part, in particular cooling of the newly galvanized steel part.

[0073] According to further training, it may be provided that, at a location within the device, before or after the steel part is fed into the station for regenerating the zinc coating, a station is provided for applying a new marking to the reprocessed steel part. This new marking may be a manufacturer's mark, a reprocessing mark, a marking indicating properties of the reprocessing, the reprocessing date, a quality seal, a legally required marking, in particular a CE marking, and / or a material mark.

[0074] According to the invention, a station for measuring the thickness of the zinc layer is provided after the station for regenerating the zinc layer of the steel part.

[0075] Overall, it should be noted that, for example, with regard to usual processing parameters for a cleaning process or for a galvanizing process, processing parameters known from the prior art can be applied.

[0076] Regarding the device for treating pre-galvanized steel parts, it should be noted that individual steps the device can perform can be implemented in separate stations or sub-stations. These stations or sub-stations can be spatially separated from one another. Furthermore, the stations or sub-stations can be connected by conveyors. The stations or sub-stations can form at least a partial production line. It can also be provided that at least some stations of the device are located at different sites, and that conveyors such as trucks are used to transport steel parts between the stations.

[0077] It should be noted that advantages, examples, explanations or further training described in connection with the process also apply to the device and vice versa.

[0078] The invention further relates to a galvanized steel part, in particular a cold-formed or hot-rolled steel part, preferably a used guardrail component of a vehicle restraint system, or a used scaffolding part, or a used steel beam, or a used body part of a vehicle, or a part of a used temporary structure, or a part of a substructure, or trapezoidal roof coverings, or sheet piling, which has been treated or reprocessed using the method of the type described above. Brief description of the characters

[0079] The invention is explained below by way of example with reference to the accompanying figures. These represent: Fig. 1 a schematic representation of a galvanized steel part in the form of a guardrail for a vehicle restraint system; Fig. 2 a schematic representation of the process for treating already galvanized steel parts; Fig. 3 a schematic representation of a device for treating already galvanized steel parts; and Fig. 4 A schematic representation of exemplary profiles of galvanized steel parts. Description of exemplary implementations

[0080] Fig. Figure 1 shows a schematic representation of a used galvanized steel part 10 in the form of a guardrail component for a vehicle restraint system. The galvanized steel part 10 has a corrugated cross-section or profile and extends perpendicular to the corrugation in a depth direction.

[0081] The illustration shows that the galvanized steel part 10 exhibits no damage, such as deformation, cracks, or warping. Although the zinc coating of the galvanized steel part 10 in the illustration is... Fig. While not explicitly stated in section 1, the galvanized steel part 10 is supposed to have a uniform zinc coating applied by means of a hot-dip galvanizing process. However, the zinc coating of the galvanized steel part 10 is damaged and / or worn and / or weathered away over time. The extent of the damage is such that the steel substance of the galvanized steel part 10 is not significantly affected.

[0082] The galvanized steel part also bears a marking 12, which indicates who the original manufacturer of the galvanized steel part 10 is and what material the galvanized steel part 10 is actually made of. The marking 12 is exemplary and could also be provided in a different manner or in a different position.

[0083] Fig. Figure 2 shows a schematic representation of the process for treating already galvanized steel parts. The galvanized steel part 10 is used in the process. Fig. 1. First, the procedure is introduced. The process comprises the following steps: A) Checking the galvanized steel part 10 for suitability for reprocessing; B) Mechanical and / or chemical preparation of the galvanized steel part 10; and C) Regenerating the zinc layer of the steel part 10.

[0084] Furthermore, the dashed arrows indicate that a galvanized steel part can undergo 10 individual steps of the process again. This also applies to partial steps of the process.

[0085] In step A), several properties of the galvanized steel part 10 are checked. These include: - Degree and extent of deformation of the galvanized steel part 10 compared to its original shape; - Wear of the galvanized steel part 10; - Material of the galvanized steel part 10; - Type of existing zinc layer; - Corrosion level of the galvanized steel part: 10; - Marking of the galvanized steel part 10.

[0086] Further properties can be checked. The properties listed above are merely examples, not exhaustive, and serve to illustrate the procedure.

[0087] If, during the step of checking the deformation of the galvanized steel part 10 relative to its original shape, it is determined that the deformation exceeds a permissible limit, then the galvanized steel part 10 exhibits a property that prevents machining or reprocessing. The extent of the deformation is such that even reshaping, for example by corrective deformation, is no longer possible. The steel part is then marked as scrap and removed from the process without being subjected to any further steps B) or C). In this case, however, it is determined that the deformation of the galvanized steel part 10 is within a permissible limit.

[0088] The wear of the galvanized steel part 10 is also within acceptable limits.

[0089] By checking the marking, the manufacturer of the original galvanized steel part 10 and the actual material of the galvanized steel part 10 are determined.

[0090] All the above-mentioned properties, which are checked in step A), lead to the result that the exemplary galvanized steel part 10 can be fed into the following steps of the process, i.e., steps B) and C).

[0091] If a verified property were such that reprocessing with the method is not possible, then the galvanized steel part 10 would, for example, be marked as scrap and sorted out and would subsequently not be subjected to any of the following steps B) or C).

[0092] In step B), the galvanized steel part 10 undergoes mechanical and / or chemical preparation. This begins with a partial cleaning step of the galvanized steel part 10, whereby, for example, contaminants are removed from the surface of the galvanized steel part 10 using high-pressure water jets.

[0093] The following sub-steps are then carried out in step B): - Measuring the galvanized steel part 10 for deviations from target dimensions, - Check whether the deviations are within specified tolerances. It is determined that the deviations are within specified tolerances. Therefore, subsequent corrective forming is not necessary for the illustrated galvanized steel part 10.

[0094] In the following step C) of regenerating the zinc layer of the steel part 10, the following sub-steps are carried out: - Cleaning the galvanized steel part 10; - Pickling of the galvanized steel part 10 using hydrochloric acid; - Rinsing the galvanized steel part 10 in a water bath; - Fluxing of the galvanized steel part 10 by immersing the galvanized steel part 10 in a flux; - Drying of the galvanized steel part 10; - Post-galvanizing of the steel part 10, in particular by immersing the steel part in a zinc bath; and - Post-processing of the newly galvanized steel part, in particular cooling of the newly galvanized steel part.

[0095] Cleaning, as the first step in a wet chemical process using an alkaline or acidic solution, ensures that any grease adhering to the galvanized steel part 10 is completely removed. The galvanized steel part 10 is immersed in a bath containing the solution. Subsequently, in a further step, the galvanized steel part 10 is immersed in a water bath.

[0096] In the pickling step, impurities such as rust and scale are removed. For this purpose, the galvanized steel part 10 is immersed in a bath of hydrochloric acid, which is at approximately room temperature. In this case, the steel part 10 still has a zinc layer after pickling.

[0097] The rinsing step takes place in a water bath.

[0098] The fluxing step is carried out by immersing the galvanized steel part 10 in a bath containing the flux, the flux being based on an aqueous salt solution.

[0099] The partial step of drying takes place through self-drying in the air.

[0100] The step of re-galvanizing the galvanized steel part 10 is carried out, for example, by immersing the steel part 10 in a bath with a zinc content of at least 98.5% and a temperature of about 450 °C.

[0101] The finishing step involves cooling the steel part in air.

[0102] Step C) is followed by step D). In this step, the thickness of the zinc coating on the newly galvanized steel part is measured to verify the preceding steps. Furthermore, the thickness of the zinc coating on the newly galvanized steel part is documented for quality assurance purposes.

[0103] Furthermore, a new marking is applied to the steel part between steps B) and C). This new marking indicates, at a minimum, that the re-galvanized steel part has been reprocessed, who carried out the process, and what material the steel part is made of.

[0104] Fig. Figure 3 is a schematic representation of a device 50 for treating already galvanized steel parts. The device 50 comprises: - a station 52 for checking the galvanized steel part 10 for suitability with regard to reprocessing; - a station 54 for the mechanical and chemical preparation of the galvanized steel part 10; - a station 56 for regenerating the zinc layer of the steel part 10; and - a station 58 for recording the thickness of the zinc layer of the newly galvanized steel part and for marking the newly galvanized steel part;

[0105] The figure further shows that the galvanized steel part is first fed 10 into the device 50. After treatment, a newly galvanized steel part 10' leaves the device 50 and can subsequently be used again as intended in practice.

[0106] The device 50 is designed to measure the following with regard to Fig. The procedures described in section 2 are to be carried out. Consequently, in station 52, step A) is carried out to check the galvanized steel part 10 for suitability with regard to reprocessing; in station 54, step B) is carried out to mechanically and chemically prepare the galvanized steel part 10; in station 56, step C) is carried out to regenerate the zinc layer of the steel part 10; and in station 58, step D) is carried out to determine the layer thickness of the zinc layer of the newly galvanized steel part and to mark the newly galvanized steel part.

[0107] The device 50 is shown schematically as explained below. It is intended to illustrate that the device 50 represents a type of production line in which steps A), B), C) and D) are carried out and the galvanized steel part 10 is transported between the stations and respective sub-stations by means of transport equipment such as conveyor belts, cranes, pallet trucks or trucks for long distances, etc.

[0108] Station 58 is shown with a dashed line to indicate that station 58 is not mandatory for measuring the zinc coating thickness of the newly galvanized steel part and can therefore be optional. However, according to the invention, station 58 is provided for measuring the coating thickness. The newly galvanized steel part 10' can also leave the device 50 without passing through station 58 for measuring the zinc coating thickness and marking the newly galvanized steel part.

[0109] Fig. Figure 4 shows a schematic representation of exemplary profiles of galvanized steel parts 10.

[0110] In version a), an exemplary profile of a galvanized steel part 10 is shown, which is essentially the same as the profile of the guardrail component made of Fig. 1 matches. The profile shows two wave crests and one wave trough.

[0111] In embodiment b) an exemplary profile of a galvanized steel part 10 is shown, in which the two wave crests are flat and formed by a deep wave trough with a straight wave trough section.

[0112] In embodiment c), an exemplary profile of a galvanized steel part 10 is shown, comprising three wave crests and two wave troughs. Thus, the galvanized steel part is similar to embodiment a). However, the wave crests are formed with a straight section.

[0113] In embodiment d), an exemplary profile of a galvanized steel part 10 is shown, comprising three wave crests and two wave troughs. Thus, the galvanized steel part is similar to embodiments a) and c). However, the wave crests and troughs have a continuous profile, without straight sections.

[0114] In the version e) an example of a profile of a galvanized steel part 10 is shown, comprising three wave crests and two wave troughs.

[0115] In embodiment f) an exemplary profile of a galvanized steel part 10 is shown, which is U-shaped in a central area and the U-shaped area is enclosed by a respective shaft end.

[0116] In embodiment g), an exemplary profile of a galvanized steel part 10 is shown, which has a C-shape. An upper, middle, and lower section of the C-shape are formed, each with straight sections.

[0117] In embodiment h) an exemplary profile of a galvanized steel part 10 is shown, which has a C-shape similar to embodiment g), wherein the central area of ​​the C-shape is shortened.

[0118] In embodiment i), an exemplary profile of a galvanized steel part 10 is shown, which has a Z-shape.

[0119] In embodiment j) an example of a profile of a galvanized steel part 10 which has a U-shape is shown.

[0120] In embodiment k) an exemplary profile of a galvanized steel part 10 is shown, which is designed similarly to a flat shell shape.

[0121] In embodiment I), an exemplary profile of a galvanized steel part 10 is shown, which, similar to embodiment g), represents a C-shape, wherein a central area of ​​the C-shape tapers to a point.

[0122] In the embodiment m) an example of a profile of a galvanized steel part 10 which has an H-shape is shown.

[0123] In embodiment n), an exemplary profile of a galvanized steel part 10 is shown, which has an H-shape. In comparison with embodiment m), the central area is smaller than the respective side areas.

[0124] In embodiment o) an exemplary profile of a galvanized steel part 10 is shown, which has a C-shape, wherein the opening of the C-shape is small.

[0125] Other galvanized steel parts not shown may include, for example, corrugated sheet metal roofs, Hösch profiles, power poles, galvanized sheet pile walls, etc.

Claims

[1] Method for reprocessing used, galvanized steel parts (10) having a zinc layer, comprising the following steps: A) Checking the used, galvanized steel part (10) for suitability for reprocessing, including determining whether a zinc layer is present; B) mechanical and / or chemical preparation of the used, galvanized steel part (10); C) Regenerating the zinc layer of the steel part (10) comprising applying an additional zinc layer to the existing, entire zinc layer of the steel part (10) so that the zinc layer is restored and an intended minimum value of layer thickness for the restored zinc layer is achieved; and D) Measuring the thickness of the restored zinc layer. [2] Method according to claim 1, wherein in step A) the galvanized steel part (10) is further checked with regard to at least one of the following properties: - Type of existing zinc layer; - Condition of the existing zinc layer; - Degree of pollution; - Type of deposits, especially salts, oxides, hydroxides, fats; - Concentration of deposits, especially salts, oxides, hydroxides, fats; - Deformation of the steel part (10) compared to an original initial shape; - Type of corrosion of the steel part (10); - Degree of corrosion of the steel part (10); - Wear of the steel part (10); - Material thickness of the steel part (10); - Marking (12) of the steel part (10); - Presence of a fastening option, in particular a bore and / or a thread and / or a hole and / or a slot; - Condition of a fastening option, in particular a bore and / or a thread and / or a hole and / or a slot; - Colour of the steel part (10); - Presence of foreign coating materials; - Material and / or material quality of the steel part (10). [3] Method according to claim 1 or 2, wherein step A) is carried out by means of at least one optical and / or mechanical and / or inductive and / or electrical and / or chemical measuring device, in particular a camera, and / or by visual inspection. [4] Method according to one of the preceding claims, wherein step B) comprises a partial step of cleaning the galvanized steel part (10). [5] Method according to claim 4, wherein the cleaning comprises at least one of the following cleaning steps: - at least section-by-section blasting of the galvanized steel part (10) using an abrasive material, for example sandblasting or water blasting, in particular high-pressure water blasting, or dry ice blasting, - at least section-by-section treatment of the galvanized steel part (10) by grinding and / or brushing, - at least section by section, the galvanized steel part (10) by applying a cleaning substance, - at least partial immersion of the galvanized steel part (10) in a cleaning bath, - at least section by section, the surface of the galvanized steel part (10) is treated using a laser. [6] Method according to any of the preceding claims, wherein step B) comprises the following sub-steps: - Measuring the galvanized steel part (10) for deviations from nominal dimensions, - Check whether the deviations are within specified tolerances, - Corrective deformation of the galvanized steel part (10) in case of deviations outside the specified tolerances. [7] Method according to claim 6, wherein the correction forming step comprises at least one of the following partial steps: - Cold forming by pressing; - Cold forming by rolling, in particular flat rolling or profile rolling; - Cold forming by bending; - Re-punching of drilled holes and / or slots and / or elongated holes; - Adding holes; - Thread cutting. [8] Method according to any of the preceding claims, wherein step C) further comprises at least one of the following partial steps: - Cleaning the galvanized steel part (10); - Pickling of the galvanized steel part (10) using a pickling agent, in particular a zinc-containing acid or hydrochloric acid; - Rinsing the galvanized steel part (10) in a water bath; - Fluxing of the steel part (10), in particular immersion of the steel part (10) in a flux, preferably in an aqueous salt solution; - Drying of the steel part (10); - Post-galvanizing of the steel part (10), in particular by immersing the steel part (10) in a zinc bath, wherein the zinc bath preferably has a zinc content of at least 98.5% zinc; - Post-processing of the newly galvanized steel part (10'), in particular cooling of the newly galvanized steel part (10'). [9] Method according to one of the preceding claims, wherein the galvanized steel parts (10) are preferably cold-formed or hot-rolled steel parts, in particular used guardrail components of vehicle restraint systems or parts thereof, or used scaffolding parts, or used steel beams, or body parts of vehicles, or used temporary structures, or galvanized substructures of, for example, greenhouses, or, for example, trapezoidal roof coverings, or sheet pile walls. [10] Method according to one of the preceding claims, wherein the galvanized steel part (10) is composed of several individual parts, preferably several identical individual parts, particularly preferably several individual parts connected with or without connecting means. [11] Device (50) for reprocessing used, galvanized steel parts (10) having a zinc layer and for carrying out the method according to one of the preceding claims, comprising - a station (52) for checking the used, galvanized steel part (10) for suitability with regard to reprocessing, comprising determining whether a zinc layer is present; - a station (54) for the mechanical and / or chemical preparation of the used, galvanized steel part (10); - a station (56) for regenerating the zinc layer of the steel part (10) comprising applying an additional zinc layer to the existing, entire zinc layer of the steel part (10) so that the zinc layer is restored and an intended minimum value of layer thickness for the restored zinc layer is achieved; and - a station (58) for recording the layer thickness of the restored zinc layer. [12] Device (50) according to claim 11, wherein in the station (52) for checking the galvanized steel part (10) for suitability with regard to reprocessing the galvanized steel part (10) is checked with regard to at least one of the following properties: - Type of existing zinc layer; - Condition of the existing zinc layer; - Degree of pollution; - Type of deposits, especially salts, oxides, hydroxides, fats; - Concentration of deposits, especially salts, oxides, hydroxides, fats; - Deformation of the steel part (10) compared to an original initial shape; - Type of corrosion of the steel part (10); - Degree of corrosion of the steel part (10); - Wear of the steel part (10); - Material thickness of the steel part (10); - Marking (12) of the steel part (10); - Presence of a fastening option, in particular a bore and / or a thread and / or a hole and / or a slot; - Condition of a fastening option, in particular a bore and / or a thread and / or a hole and / or a slot; - Colour of the steel part (10); - Presence of foreign coating materials; - Material and / or material quality of the steel part (10). [13] Device (50) according to claim 11 or 12, wherein the station (52) for checking the galvanized steel part (10) for suitability with regard to reprocessing comprises an optical and / or mechanical and / or inductive and / or electrical and / or chemical measuring device, in particular a camera, and / or an area for visual inspection. [14] Device (50) according to one of claims 11 to 13, wherein the station (54) for mechanical and / or chemical preparation of the galvanized steel part (10) comprises a sub-station for cleaning the galvanized steel part (10), wherein the sub-station for cleaning the galvanized steel part (10) performs at least one of the following cleaning steps: - at least section-by-section blasting of the galvanized steel part (10) using an abrasive material, for example sandblasting or water blasting, in particular high-pressure water blasting, or dry ice blasting - at least section-by-section treatment of the galvanized steel part (10) by grinding or brushing, - at least section by section, the galvanized steel part (10) by applying a cleaning substance, - at least partial immersion of the galvanized steel part (10) in a cleaning bath, - at least section by section, the surface of the galvanized steel part (10) is treated using a laser. [15] Device (50) according to one of claims 11 to 14, wherein the station (54) for mechanical and / or chemical preparation of the galvanized steel part (10) comprises at least one sub-station for measuring the galvanized steel part (10) for deviations from nominal dimensions, furthermore at least one sub-station for checking whether the deviations are within specified tolerances, and furthermore at least one sub-station for corrective deformation of the galvanized steel part (10) in the case of deviations outside the specified tolerances. [16] Device (50) according to claim 15, wherein the partial station for corrective deformation is configured to deform the galvanized steel part (10) according to at least one of the following partial steps: - Cold forming by pressing; - Cold forming by rolling, in particular flat rolling or profile rolling; - Cold forming by bending; - Re-punching of drilled holes and / or slots and / or elongated holes; - Adding holes; - Thread cutting. [17] Device (50) according to one of claims 11 to 16, wherein the station (56) for regenerating the zinc layer of the steel part (10) comprises at least one sub-station configured to perform at least one of the following sub-steps: - Cleaning the galvanized steel part (10); - Pickling of the galvanized steel part (10) using a pickling agent, in particular a zinc-containing acid or hydrochloric acid; - Rinsing the galvanized steel part (10) in a water bath; - Fluxing of the galvanized steel part (10), in particular immersion of the galvanized steel part (10) in a flux, preferably in an aqueous salt solution; - Drying of the galvanized steel part (10); - Post-galvanizing of the steel part (10), in particular by immersing the galvanized steel part (10) in a zinc bath, wherein the zinc bath preferably has a zinc content of at least 98.5% zinc; - Post-processing of the newly galvanized steel part (10'), in particular cooling of the newly galvanized steel part (10').

Images