EP0826788B1 - Galvanizing method - Google Patents
Galvanizing method Download PDFInfo
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- EP0826788B1 EP0826788B1 EP96113879A EP96113879A EP0826788B1 EP 0826788 B1 EP0826788 B1 EP 0826788B1 EP 96113879 A EP96113879 A EP 96113879A EP 96113879 A EP96113879 A EP 96113879A EP 0826788 B1 EP0826788 B1 EP 0826788B1
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- components
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- baths
- heat
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000005246 galvanizing Methods 0.000 title abstract description 32
- 238000005554 pickling Methods 0.000 claims abstract description 12
- 238000005238 degreasing Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 15
- 238000002203 pretreatment Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 230000004907 flux Effects 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 14
- 239000011701 zinc Substances 0.000 description 14
- 229910052725 zinc Inorganic materials 0.000 description 14
- 238000001704 evaporation Methods 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 7
- 238000011068 loading method Methods 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 239000003112 inhibitor Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000002803 fossil fuel Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000000080 wetting agent Substances 0.000 description 2
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013527 degreasing agent Substances 0.000 description 1
- 238000005237 degreasing agent Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002529 flux (metallurgy) Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
Images
Classifications
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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
- C23C2/34—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
-
- 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
- C23C2/003—Apparatus
- C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- 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
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
-
- 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
Definitions
- the invention relates to a method for hot-dip galvanizing, in particular for a long time and lean components after passing through at least one degreasing, Pickling and flux baths.
- Such hot-dip galvanizing processes are known.
- the containers for the pretreatment of the galvanized Workpieces parallel to each other and transversely to the transport device of the galvanized Workpieces; they are thus transverse to their longitudinal direction with the workpieces to be pretreated, which are suspended on trusses, loaded.
- the temperature of the pretreatment baths corresponds to essentially the room temperature.
- each between these treatment baths at least one rinsing bath is arranged to remove the treatment media from the previous bath before the workpieces enter the next Rinse off the treatment bath from the workpieces.
- the known methods for hot-dip galvanizing not only have the disadvantage long dwell times of the workpieces to be treated in the bathrooms their low temperature, but also require long transportation times between the bathrooms, as the workpieces are suspended in trusses individual gantry cranes are moved.
- This results in the known Process an unfavorable use of the hot-dip galvanizing plant, in particular the zinc bath, which must always be kept at a high temperature.
- the multitude of Treatment baths and those arranged between the treatment baths Rinsing baths increase the necessary investments as well Operating cost.
- the after the galvanizing process of the workpieces in the Unloading trusses must also go through Means of transport back to the loading station of the workpieces to the other Be brought to the end of the galvanizing hall.
- the invention has for its object to provide a method for hot-dip galvanizing, in particular long and slim components, such as finned tube bundles, of the type described above, which not only requires less investment, but allows a significantly increased efficiency compared to the known hot-dip galvanizing process, which is too significant shorter throughput times of the workpieces and thus reduced costs.
- the solution to this problem by the invention is characterized in that the components are fed one after the other in the transport direction by means of a continuously circulating transport system, one after the other pretreatment baths, at least one of which carries out several pretreatment steps at the same time and which are kept at a temperature which is higher than the room temperature and are connected to at least one suction device for the resulting vapors.
- Pretreatment baths arranged in series result in a special one Favorable way, a structurally simple, yet effective seal for the entry and exit of the workpieces in the opposite of the environment to create a sealed space above the pretreatment baths since small and easily sealable components are found, especially with long and slim components Opening cross sections result.
- the hot-dip galvanizing process with one of the galvanizing process downstream targeted cooling of the galvanized components can be carried out according to one Another feature of the invention is the heat for heating the pretreatment baths to a temperature above room temperature at least in part by recovering the galvanized ones as they cool down Components released heat are generated. This way a not inconsiderable energy saving.
- heat can be used for partial heating of the Drying of the pretreated components before the galvanizing required air be used, which is associated with a further energy saving.
- the invention proposes that in the galvanizing process released heat for heating the pretreatment baths and / or Recover drying of the pre-treated components.
- the one in the galvanizing process released heat includes radiation heat generated by the zinc bath and when the zinc bath is heated by burning fossil fuels in the exhaust gases of that combustion contained heat.
- the Hot-dip galvanizing process according to the invention with cooling of the galvanized components in a downstream of the galvanizing process Water bath works, is finally proposed with the invention, the Filling the pre-treatment tank due to loss of evaporation required water in the water bath downstream of the galvanizing process refer to. Because the water is used to cool the galvanized components used water bath has a high temperature, the in this Water contains heat at the same time as the pretreatment baths used, whereas to fill up the evaporation losses Water supplied at about room temperature the cooling effect of this the galvanizing process downstream water bath increased.
- the schematic plan view of an embodiment of a hot dip galvanizing plant shows a continuously rotating transport system T, for example in the form of a monorail, which operates as a closed ring railway and is automated so that the transport and lowering processes of the Traverses suspended components made in time. In one embodiment are carried out eight work cycles per hour, so that at Traverse batches of up to three tons a throughput through the Galvanizing plant of 24 tons per hour results.
- the components to be galvanized are in the embodiment on three in the direction of transport consecutive loading stations 1a, 1b and 1c the Transport system T abandoned and after going through a semicircular Transport route fed to a first pretreatment bath 2.
- This pretreatment bath 2 is with a treatment medium of 47.5% sixteen percent hydrochloric acid, 2% degreasing agent and 0.5% inhibitor (Wetting agent) and 50% water filled and has one in the embodiment Temperature of 70 ° C.
- This pretreatment bath takes place at the same time a degreasing and pickling process takes place.
- the degreased and pre-pickled component then passes into another one Pretreatment bath 3, in which the remaining pickling process takes place.
- This pretreatment bath 3 also kept at a temperature of 70 ° C. contains an aqueous solution of 49.5% sixteen percent hydrochloric acid and 0.5% inhibitor (wetting agent) and 50% water.
- the pickling bath is followed by a further pretreatment bath 4, the one contains aqueous solution with a total of about 60% flux, for example composed of 40% ammonium chloride and 60% zinc chloride and kept at a temperature of 90 ° C.
- aqueous solution with a total of about 60% flux, for example composed of 40% ammonium chloride and 60% zinc chloride and kept at a temperature of 90 ° C.
- the component pretreated in this way is then a zinc bath 6 fed that filled with liquid zinc at a temperature of about 445 ° C is.
- the liquid zinc can be used to improve the galvanizing quality Nickel content of 0.05% can be added.
- the component in the zinc bath 6 After a dwell time corresponding to the cycle time of the transport system T. the component in the zinc bath 6, the component is removed from the zinc bath 6, shaken and in the illustrated embodiment by a brush station 7 guided, in which zinc drops adhering to the component are brushed off in order to to make post-treatment of the galvanized components unnecessary.
- the hot-dip galvanized component then passes into a cooling bath 8, which coincides with Water is filled. This water reaches due to the introduced in time galvanized components a temperature up to 100 ° C.
- the heat required to heat the pretreatment baths 2, 3 and 4 can be at least partially recovered by cooling the galvanized components are released heat.
- this heat recovery that heats up in the cooling bath 8 Water used.
- Vapors contained heat can be used, preferably partially Heating of the air with which the pretreated components in the drying zone 5 be dried before entering the zinc bath 6.
- the zinc bath 6 during the galvanizing process heat released to heat the pretreatment tanks 2, 3 or 4 and / or for drying the pretreated components in the drying zone 5 use.
- the heat released during the galvanizing process is concerned the heat released by the radiation of the zinc bath, on the other hand to heat contained in exhaust gases when the zinc bath 6 through Burning fossil fuels kept at the desired temperature becomes.
- Recyclable materials are particularly iron oxide, which is caused by the Pickling processes from rust adhering to the pretreated components or Tinder is formed and in the form of sludge from the sump of the pretreatment baths 2, 3 and 4 is subtracted. By filtering and processing This sludge can extract the valuable materials contained therein become.
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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)
- Coating With Molten Metal (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Feuerverzinken insbesondere langer und schlanker Bauteile nach Durchlaufen mindestens jeweils eines Entfettungs-, Beiz- und Flußmittelbades.The invention relates to a method for hot-dip galvanizing, in particular for a long time and lean components after passing through at least one degreasing, Pickling and flux baths.
Derartige Feuerverzinkungsverfahren sind bekannt. Bei den bekannten Verfahren stehen zumindest die Behälter zur Vorbehandlung der zu verzinkenden Werkstücke parallel zueinander und quer zur Transportvorrichtung der zu verzinkenden Werkstücke; sie werden somit quer zu ihrer Längsrichtung mit den vorzubehandelnden Werkstücken, die an Traversen aufgehängt sind, beschickt. Die Temperatur der Vorbehandlungsbäder entspricht im wesentlichen der Raumtemperatur. Üblicherweise werden nach einem Entfettungsbad mehrere Beizbäder und zumindest ein Flußmittelbad nebeneinander angeordnet, wobei zwischen diesen Behandlungsbädern jeweils mindestens ein Spülbad angeordnet ist, um die Behandlungsmedien aus dem vorangegangenen Bad vor dem Eintreten der Werkstücke in das nächste Behandlungsbad von den Werkstücken abzuspülen.Such hot-dip galvanizing processes are known. In the known methods are at least the containers for the pretreatment of the galvanized Workpieces parallel to each other and transversely to the transport device of the galvanized Workpieces; they are thus transverse to their longitudinal direction with the workpieces to be pretreated, which are suspended on trusses, loaded. The temperature of the pretreatment baths corresponds to essentially the room temperature. Usually after a Degreasing bath several pickling baths and at least one flux bath arranged side by side, each between these treatment baths at least one rinsing bath is arranged to remove the treatment media from the previous bath before the workpieces enter the next Rinse off the treatment bath from the workpieces.
Die bekannten Verfahren zum Feuerverzinken haben den Nachteil nicht nur langer Verweilzeiten der zu behandelnden Werkstücke in den Bädern wegen deren geringer Temperatur, sondern erfordern auch lange Transportzeiten zwischen den Bädern, da die Werkstücke in Traversen hängend mittels einzelner Portalkräne bewegt werden. Hierdurch ergibt sich bei den bekannten Verfahren eine ungünstige Nutzung der Feuerverzinkungsanlage, insbesondere des stets auf hoher Temperatur zu haltenden Zinkbades. Die Vielzahl der Behandlungsbäder und die zwischen den Behandlungsbädern angeordneten Spülbäder erhöhen hierbei die notwendigen Investitionen sowie Betriebskosten. Die nach dem Verzinkungsvorgang der Werkstücke in der Entnahmestation entladenen Traversen müssen darüber hinaus durch Transportmittel wieder an die Aufgabestation der Werkstücke an das andere Ende der Verzinkungshalle gebracht werden.The known methods for hot-dip galvanizing not only have the disadvantage long dwell times of the workpieces to be treated in the bathrooms their low temperature, but also require long transportation times between the bathrooms, as the workpieces are suspended in trusses individual gantry cranes are moved. This results in the known Process an unfavorable use of the hot-dip galvanizing plant, in particular the zinc bath, which must always be kept at a high temperature. The multitude of Treatment baths and those arranged between the treatment baths Rinsing baths increase the necessary investments as well Operating cost. The after the galvanizing process of the workpieces in the Unloading trusses must also go through Means of transport back to the loading station of the workpieces to the other Be brought to the end of the galvanizing hall.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Feuerverzinken insbesondere langer und schlanker Bauteile, wie beispielsweise Rippenrohrbündel, der eingangs beschriebenen Art zu schaffen, das nicht nur einen geringeren Investitionsaufwand erfordert, sondern eine gegenüber den bekannten Feuerverzinkungsverfahren erheblich gesteigerte Effizienz ermöglicht, die zu erheblich kürzeren Durchlaufzeiten der Werkstücke und damit verringerten Kosten führt.The invention has for its object to provide a method for hot-dip galvanizing, in particular long and slim components, such as finned tube bundles, of the type described above, which not only requires less investment, but allows a significantly increased efficiency compared to the known hot-dip galvanizing process, which is too significant shorter throughput times of the workpieces and thus reduced costs.
Die Lösung dieser Aufgabenstellung durch die Erfindung ist dadurch gekennzeichnet, daß die Bauteile mittels eines kontinuierlich im Takt umlaufenden Transportsystems nacheinander in Transportrichtung hintereinander angeordneten Vorbehandlungsbädern zugeführt werden, von denen mindestens ein Bad gleichzeitig mehrere Vorbehandlungsschritte ausführt und die insgesamt auf einer gegenüber der Raumtemperatur erhöhten Temperatur gehalten und an mindestens eine Absaugeinrichtung für die anfallenden Dämpfe angeschlossen sind.The solution to this problem by the invention is characterized in that the components are fed one after the other in the transport direction by means of a continuously circulating transport system, one after the other pretreatment baths, at least one of which carries out several pretreatment steps at the same time and which are kept at a temperature which is higher than the room temperature and are connected to at least one suction device for the resulting vapors.
Durch das kontinuierlich im Takt umlaufende Transportsystem ergeben sich bei in Transportrichtung hintereinander ausgerichteten Vorbehandlungsbehältern kurze Transportzeiten, die eine intensivere Nutzung der Anlage ermöglichen. Die die Wirksamkeit der Behandlungsmedien steigernde Temperaturerhöhung in den Vorbehandlungsbädern erzielt kürzere Verweilzeiten der Werkstücke in den Vorbehandlungsbädern, deren Anzahl darüber hinaus drastisch verringert wird, weil nicht nur zwischen den einzelnen Vorbehandlungsbädern angeordnete Spülbäder entfallen, sondern mindestens ein Bad gleichzeitig mehrere Vorbehandlungsschritte ausführt, nämlich ein gleichzeitiges Entfetten und Vorbeizen der zu verzinkenden Werkstücke. Um die durch die Erhöhung der Temperatur in den Vorbehandlungsbädern entstehenden Dämpfe unschädlich zu machen, sind die Vorbehandlungsbäder an mindestens eine Absaugeinrichtung für die anfallenden Dämpfe angeschlossen. Durch in Transportrichtung der Werkstücke in Längsrichtung hintereinander angeordnete Vorbehandlungsbäder ergibt sich eine besonders günstige Möglichkeit, eine konstruktiv einfache und dennoch wirksame Abdichtung für den Ein- und Austritt der Werkstücke in den gegenüber der Umgebung abgedichteten Raum oberhalb der Vorbehandlungsbäder zu schaffen, da sich insbesondere bei langen und schlanken Bauteilen kleine und gut abdichtbare Öffnungsquerschnitte ergeben.Due to the continuously rotating transport system, with pretreatment containers aligned one behind the other in the transport direction short transport times, the more intensive use of the Enable attachment. The increasing effectiveness of the treatment media Increasing the temperature in the pretreatment baths leads to shorter dwell times of the workpieces in the pretreatment baths, their number above is also drastically reduced because not only between the individual pretreatment baths arranged rinse baths are omitted, but at least one Bad performs several pretreatment steps simultaneously, namely a simultaneous one Degreasing and pickling the workpieces to be galvanized. To the arising from the increase in temperature in the pretreatment baths The pretreatment baths are on to make vapors harmless at least one suction device for the vapors generated. By moving the workpieces in the longitudinal direction Pretreatment baths arranged in series result in a special one Favorable way, a structurally simple, yet effective seal for the entry and exit of the workpieces in the opposite of the environment to create a sealed space above the pretreatment baths since small and easily sealable components are found, especially with long and slim components Opening cross sections result.
Mit dem erfindungsgemäßen Vorschlag wird insgesamt ein Feuerverzinkungsverfahren geschaffen, das bei verringertem Investitionsaufwand infolge kurzer Transport- und Verweilzeiten eine erheblich höhere Verzinkungsleistung ergibt, so daß die Kosten für das Feuerverzinken erheblich reduziert werden.With the proposal according to the invention, a hot-dip galvanizing process is used overall created that with reduced investment costs due to short Transport and dwell times result in a considerably higher galvanizing capacity, so that the cost of hot dip galvanizing is significantly reduced.
Sofern das Feuerverzinkungsverfahren mit einer dem Verzinkungsprozeß nachgeschalteten gezielten Abkühlung der verzinkten Bauteile, beispielsweise durch Luft oder in einem Wasserbad, durchgeführt wird, kann gemäß einem weiteren Merkmal der Erfindung die Wärme zur Aufheizung der Vorbehandlungsbäder auf eine Temperatur oberhalb der Raumtemperatur mindestens teilweise durch Rückgewinnung der bei der Abkühlung der verzinkten Bauteile freiwerdenden Wärme erzeugt werden. Auf diese Weise ergibt sich eine nicht unerhebliche Energieeinsparung.If the hot-dip galvanizing process with one of the galvanizing process downstream targeted cooling of the galvanized components, for example by air or in a water bath, can be carried out according to one Another feature of the invention is the heat for heating the pretreatment baths to a temperature above room temperature at least in part by recovering the galvanized ones as they cool down Components released heat are generated. This way a not inconsiderable energy saving.
Auch die in den aus den Vorbehandlungsbädern abgesaugten Dämpfen enthaltende Wärme kann erfindungsgemäß zur teilweisen Erwärmung der zur Trocknung der vorbehandelten Bauteile vor dem Verzinken benötigten Luft verwendet werden, womit eine weitere Energieeinsparung verbunden ist.Also those contained in the vapors extracted from the pretreatment baths According to the invention, heat can be used for partial heating of the Drying of the pretreated components before the galvanizing required air be used, which is associated with a further energy saving.
Weiterhin wird mit der Erfindung vorgeschlagen, die beim Verzinkungsprozeß freiwerdende Wärme zum Aufheizen der Vorbehandlungsbäder und/oder zur Trocknung der vorbehandelten Bauteile rückzugewinnen. Die beim Verzinkungsprozeß freiwerdende Wärme umfaßt hierbei die durch Abstrahlung des Zinkbades entstehende Wärme und bei einer Beheizung des Zinkbades durch Verbrennen fossiler Brennstoffe die in den Abgasen dieser Verbrennung enthaltene Wärme. Furthermore, the invention proposes that in the galvanizing process released heat for heating the pretreatment baths and / or Recover drying of the pre-treated components. The one in the galvanizing process released heat includes radiation heat generated by the zinc bath and when the zinc bath is heated by burning fossil fuels in the exhaust gases of that combustion contained heat.
Um das Entstehen von in speziellen Kläranlagen mit großem Aufwand aufzubereitendem Abwasser wie bei den bekannten Feuerverzinkungsanlagen zu vermeiden, wird gemäß einem weiteren Merkmal der Erfindung das in den wässrigen Lösungen der Vorbehandlungsbehälter verwendete Wasser im geschlossenen Kreislauf geführt und das Behandlungsmedium jedes einzelnen Vorbehandlungsbehälters in einem überlagerten Kreislauf umgewälzt und von durch die Bauteile eingeschleppten Fremdstoffen gereinigt, die entweder in die Vorstufe rückgeführt oder einer gesonderten Verwertung zugeführt werden. Bei der Rückführung handelt es sich um durch die Bauteile in die darauffolgende Behandlungsstufe eingeschleppte Behandlungsmedien, wie Säuren, Inhibitoren und Flußmittel aus der vorangegangenen Behandlungsstufe. Einer gesonderten Verwertung werden Wertstoffe zugeführt, insbesondere Eisenoxid, das in den Behandlungsbädern durch Umwandlung von Zunder oder Rost in Form von Schlamm anfällt und aus dem Sumpf der Badbehälter abgezogen wird.To create in special sewage treatment plants with great effort wastewater to be treated as in the known hot-dip galvanizing plants to avoid, according to a further feature of the invention, that in the aqueous solutions of the pretreatment tanks used water in the closed Cycle and the treatment medium of each individual Pretreatment container circulated in a superimposed circuit and from by the components brought in foreign substances that are either in the Preliminary stage can be recycled or recycled separately. The return is through the components to the next one Treatment stage introduced treatment media, such as acids, Inhibitors and fluxes from the previous treatment stage. One Separate recycling, valuable materials are supplied, in particular iron oxide, that in the treatment baths by converting scale or rust accumulates in the form of sludge and is withdrawn from the sump of the bath tank becomes.
Insgesamt ergibt sich somit ein abwasserfreier Betrieb des erfindungsgemäßen Feuerverzinkungsverfahrens, so daß lediglich die aufgrund der unvermeidbaren Verdunstung entstehenden Wasserverluste ausgeglichen werden müssen.Overall, wastewater-free operation of the invention results Hot-dip galvanizing process, so that only due to the inevitable Evaporation water losses must be compensated.
Sofern das erfindungsgemäße Feuerverzinkungsverfahren mit einer Kühlung der verzinkten Bauteile in einem dem Verzinkungsprozeß nachgeschalteten Wasserbad arbeitet, wird mit der Erfindung schließlich vorgeschlagen, das zur Auffüllung der Vorbehandlungsbehälter aufgrund von Verdunstungsverlusten benötigte Wasser dem dem Verzinkungsprozeß nachgeschalteten Wasserbad zu entnehmen. Da das Wasser dieses zur Kühlung der verzinkten Bauteile verwendeten Wasserbades eine hohe Temperatur hat, wird die in diesem Wasser enthaltene Wärme gleichzeitig zur Aufheizung der Vorbehandlungsbäder genutzt, wogegen das zur Auffüllung der Verdunstungsverluste dem Wasser etwa mit Raumtemperatur zugeführte Wasser die Kühlwirkung dieses dem Verzinkungsprozeß nachgeschalteten Wasserbades erhöht.If the hot-dip galvanizing process according to the invention with cooling of the galvanized components in a downstream of the galvanizing process Water bath works, is finally proposed with the invention, the Filling the pre-treatment tank due to loss of evaporation required water in the water bath downstream of the galvanizing process refer to. Because the water is used to cool the galvanized components used water bath has a high temperature, the in this Water contains heat at the same time as the pretreatment baths used, whereas to fill up the evaporation losses Water supplied at about room temperature the cooling effect of this the galvanizing process downstream water bath increased.
Auf der Zeichnung ist schematisch in einer Draufsicht eine Anlage zum Feuerverzinken insbesondere langer und schlanker Bauteile dargestellt, anhand der nachfolgend das erfindungsgemäße Verfahren erläutert werden wird. In the drawing, a plant for hot-dip galvanizing is shown schematically in a top view especially long and slim components shown, based on the the method according to the invention will be explained below.
Die schematische Draufsicht auf ein Ausführungsbeispiel einer Feuerverzinkungsanlage zeigt ein kontinuierlich umlaufendes Transportsystem T, beispielsweise in Form einer Hängebahn, die als geschlossene Ringbahn betrieben und so automatisiert wird, daß Transport- und Absenkvorgänge der an Traversen aufgehängten Bauteile im Takt erfolgen. Bei einem Ausführungsbeispiel werden acht Arbeitstakte pro Stunde durchgeführt, so daß sich bei Traversenchargen von bis zu drei Tonnen ein Durchsatz durch die Verzinkungsanlage von 24 Tonnen pro Stunde ergibt.The schematic plan view of an embodiment of a hot dip galvanizing plant shows a continuously rotating transport system T, for example in the form of a monorail, which operates as a closed ring railway and is automated so that the transport and lowering processes of the Traverses suspended components made in time. In one embodiment are carried out eight work cycles per hour, so that at Traverse batches of up to three tons a throughput through the Galvanizing plant of 24 tons per hour results.
Die zu verzinkenden Bauteile, beispielsweise bis zu 15 Meter lange Bündel aus
berippten Rohren, werden beim Ausführungsbeispiel an drei in Transportrichtung
hintereinander liegenden Aufgabestationen 1a, 1b und 1c dem
Transportsystem T aufgegeben und nach Durchlaufen einer halbkreisförmigen
Transportstrecke einem ersten Vorbehandlungsbad 2 zugeführt. Dieses Vorbehandlungsbad
2 ist mit einem Behandlungsmedium aus 47,5 %
sechzehnprozentiger Salzsäure, 2 % Entfettungsmittel und 0,5 % Inhibitor
(Netzmittel) sowie 50 % Wasser gefüllt und hat beim Ausführungsbeispiel eine
Temperatur von 70°C. In diesem Vorbehandlungsbad findet somit gleichzeitig
ein Entfettungs- und Beizvorgang statt.The components to be galvanized, for example bundles up to 15 meters long
finned tubes, are in the embodiment on three in the direction of transport
Anschließend gelangt das entfettete und vorgebeizte Bauteil in ein weiteres Vorbehandlungsbad 3, in dem der restliche Beizvorgang stattfindet. Dieses ebenfalls auf einer Temperatur von 70°C gehaltene Vorbehandlungsbad 3 enthält eine wässrige Lösung aus 49,5 % sechzehnprozentiger Salzsäure und 0,5 % Inhibitor (Netzmittel) und 50 % Wasser.The degreased and pre-pickled component then passes into another one Pretreatment bath 3, in which the remaining pickling process takes place. This pretreatment bath 3 also kept at a temperature of 70 ° C. contains an aqueous solution of 49.5% sixteen percent hydrochloric acid and 0.5% inhibitor (wetting agent) and 50% water.
Dem Beizbad ist ein weiteres Vorbehandlungsbad 4 nachgeschaltet, das eine wässrige Lösung mit insgesamt etwa 60 % Flußmittel enthält, das sich beispielsweise aus 40 % Ammoniumchlorid und 60 % Zinkchlorid zusammensetzt und auf einer Temperatur von 90°C gehalten wird.The pickling bath is followed by a further pretreatment bath 4, the one contains aqueous solution with a total of about 60% flux, for example composed of 40% ammonium chloride and 60% zinc chloride and kept at a temperature of 90 ° C.
Nach dem Verlassen dieses Vorbehandlungsbades 4 gelangt das von Fett, Rost und Zunder gereinigte sowie zur Verzinkung vorbereitete Bauteil in eine Trockenzone 5, in der es durch Luft mit einer Temperatur von mindestens 100°C getrocknet wird. After leaving this pretreatment bath 4, the fat, Rust and scale cleaned and prepared for galvanizing in one Drying zone 5, in which it is air with a temperature of at least 100 ° C is dried.
Das auf diese Weise vorbehandelte Bauteil wird anschließend einem Zinkbad 6
zugeführt, das mit flüssigem Zink mit einer Temperatur von etwa 445°C gefüllt
ist. Dem flüssigen Zink kann zur Verbesserung der Verzinkungsqualität ein
Nickelanteil von 0,05 % zugegeben werden.The component pretreated in this way is then a
Nach einer der Taktzeit des Transportsystems T entsprechenden Verweilzeit
des Bauteils im Zinkbad 6 wird das Bauteil aus dem Zinkbad 6 entnommen,
gerüttelt und beim dargestellten Ausführungsbeispiel durch eine Bürstenstation
7 geführt, in der dem Bauteil anhaftende Zinktropfen abgebürstet werden, um
eine Nachbehandlung der verzinkten Bauteile entbehrlich zu machen.After a dwell time corresponding to the cycle time of the transport system T.
the component in the
Anschließend gelangt das verzinkte, heiße Bauteil in ein Abkühlbad 8, das mit Wasser gefüllt ist. Dieses Wasser erreicht aufgrund der im Takt eingeführten verzinkten Bauteile eine Temperatur bis zu 100°C.The hot-dip galvanized component then passes into a cooling bath 8, which coincides with Water is filled. This water reaches due to the introduced in time galvanized components a temperature up to 100 ° C.
Wenn das auf etwa 100°C abgekühlte verzinkte Bauteil das Abkühlbad 8 verläßt, bewirkt die noch im Bauteil verbliebene Wärme eine Verdunstung des Wassers und damit ein Trocknen des Bauteils, wenn dieses beim Ausführungsbeispiel wiederum auf einer halbkreisförmigen Transportstrecke einem der hintereinandergeschalteten Entnahmestationen 9a, 9b oder 9c zugeführt wird.When the galvanized component cooled to about 100 ° C. leaves the cooling bath 8, the heat remaining in the component causes evaporation of the Water and thus drying the component, if this in the embodiment again on a semicircular transport route the series-connected removal stations 9a, 9b or 9c fed becomes.
Durch das kontinuierlich im Takt umlaufende Transportsystem T ergeben sich
kurze Transportzeiten für die zu verzinkenden Bauteile. Die gegenüber der
Umgebungstemperatur erhöhten Temperaturen in den Vorbehandlungsbädern
2, 3 und 4 ermöglichen eine erhebliche Verkürzung der Verweilzeiten der vorzubehandelnden
Bauteile beim Entfetten, Beizen und bei der Behandlung mit
Flußmittel, wobei sich durch die Zusammenlegung des Entfettungsvorganges
mit einem Vorbeizgang eine Einsparung eines Vorbehandlungsbades ergibt.
Insgesamt wird somit durch das voranstehend beschriebene Verfahren die
Leistungsfähigkeit der anhand eines Ausführungsbeispiels dargestellten Anlage
erhöht. Durch das kontinuierlich umlaufende Transportsystem T sind den
Entnahmestationen 9a, 9b oder 9c die Aufgabestationen 1a, 1b oder 1c
nachgeschaltet, so daß ein aufwendiger Rücktransport der entladenen
Traversen von der Entnahmestation zur Aufgabestation entfällt. Due to the continuously rotating transport system T,
short transport times for the components to be galvanized. The opposite of the
Ambient temperature increased temperatures in the
Um die aufgrund der Erhöhung der Temperatur der Vorbehandlungsbäder entstehenden
Dämpfe unschädlich zu machen und die in den Dämpfen enthaltenden
Behandlungsmedien rückzugewinnen, sind sämtliche Vorbehandlungsbäder
2, 3 und 4 an mindestens eine auf der Zeichnung nicht dargestellte Absaugeinrichtung
angeschlossen. Die am Ausführungsbeispiel dargestellte Anordnung
der Vorbehandlungsbäder 2, 3 und 4 in mit der Transportrichtung
übereinstimmender Längsrichtung hintereinander ermöglicht nicht nur einen
einfachen Transport der zu verzinkenden Bauteile, sondern schafft günstige
Voraussetzungen für den Ein- und Austritt der vorzubehandelnden Bauteile in
bzw. aus dem gegenüber der Umgebung abgedichteten, mit der Absaugeinrichtung
verbundenen Raum oberhalb der Vorbehandlungsbäder 2, 3 und 4.
Insbesondere lange und schlanke Bauteile können durch kleine Öffnungsquerschnitte
mit geringen Abdichtverlusten zu- und abgeführt werden.To the resulting from the increase in the temperature of the pretreatment baths
To render vapors harmless and those contained in the vapors
Recovering treatment media is all
Die zur Aufheizung der Vorbehandlungsbäder 2, 3 und 4 benötigte Wärme
kann mindestens teilweise durch Rückgewinnung der bei der Abkühlung der
verzinkten Bauteile freiwerdenden Wärme erzeugt werden. Beim Ausführungsbeispiel
wird für diese Wärmerückgewinnung das sich im Abkühlbad 8 aufheizende
Wasser herangezogen.The heat required to heat the
Auch die in den aus den Vorbehandlungsbädern 2, 3 und 4 abgesaugten
Dämpfen enthaltene Wärme kann genutzt werden, vorzugsweise zur teilweise
Erwärmung der Luft, mit der die vorbehandelten Bauteile in der Trockenzone 5
vor dem Eintritt in das Zinkbad 6 getrocknet werden.Also those extracted from the
Schließlich ist es auch möglich, die beim Verzinkungsprozeß im Zinkbad 6
freiwerdende Wärme zur Aufheizung der Vorbehandlungsbehälter 2, 3 oder 4
und/oder zur Trocknung der vorbehandelten Bauteile in der Trockenzone 5 zu
verwenden. Bei der beim Verzinkungsprozeß freiwerdenden Wärme handelt es
sich einmal um die durch Abstrahlung des Zinkbades freiwerdende Wärme,
zum anderen um in Abgasen enthaltene Wärme, wenn das Zinkbad 6 durch
Verbrennung fossiler Brennstoffe auf der gewünschten Temperatur gehalten
wird.Finally, it is also possible to use the
Um das Entstehen von verunreinigtem Abwasser zu vermeiden, das in
speziellen Kläranlagen mit großem Aufwand aufbereitet werden muß, wird bei
dem voranstehend beschriebenen Verfahren das in den wässrigen Lösungen
der Vorbehandlungsbehälter 2, 3 und 4 verwendete Wasser im geschlossenen
Kreislauf über diese Vorbehandlungsbehälter 2, 3 und 4 geführt. Gleichzeitig
wird das Behandlungsmedium jedes einzelnen Vorbehandlungsbehälters 2, 3
oder 4 in einem überlagerten Kreislauf umgewälzt und hierbei von durch die
Bauteile eingeschleppten Fremdstoffen gereinigt und auf die jeweilige
Ausgangskonzentration aufbereitet. Diese Fremdstoffe werden entweder in die
jeweilige Vorstufe zurückgeführt, wenn es sich um Bestandteile der in den
Vorbehandlungsbädern verwendeten Behandlungsmedien handelt. Sofern sich
in den Vorbehandlungsbädern 2, 3 und gegebenenfalls 4 Wertstoffe
ansammeln, werden diese einer gesonderten Verwertung zugeführt. Bei diesen
Wertstoffen handelt es sich insbesondere um Eisenoxid, das durch die
Beizvorgänge aus an den vorzubehandelnden Bauteilen anhaftendem Rost oder
Zunder entsteht und in Form von Schlamm aus dem Sumpf der Vorbehandlungsbäder
2, 3 und 4 abgezogen wird. Durch Filtern und Aufbereiten
dieses Schlammes können die hierin enthaltenen Wertstoffe herausgezogen
werden.In order to avoid the creation of contaminated wastewater, the in
special wastewater treatment plants must be prepared with great effort, will
the method described above that in the aqueous solutions
the
Insgesamt ergibt sich durch die voranstehend beschriebenen Verfahrensschritte
ein abwasserfreier Betrieb des Feuerverzinkungsverfahrens, das auf
diese Weise eine Umweltbelastung vermeidet. Es ist lediglich erforderlich,
durch unvermeidbare Verdunstungsverluste verlorengehendes Wasser zu ersetzen.
Wenn dieses Wasser nicht den Vorbehandlungsbädern 2, 3 und 4,
sondern dem Abkühlbad 8 zugeführt wird und die in den Vorbehandlungsbädern
2, 3 und 4 entstehenden Verdunstungsverluste durch Wasser aus dem
Abkühlbad 8 ausgeglichen werden, ergibt sich der Vorteil, daß durch dieses
aus dem Abkühlbad 8 entnommene Wasser zugleich eine Aufheizung der Vorbehandlungsbäder
2, 3 und 4 erfolgt. Hiermit ist nicht nur eine Art Wärmerückgewinnung
verbunden, sondern gleichzeitig eine Erhöhung der Kühlwirkung
im Abkühlbad 8 durch das mit Raumtemperatur zugeführte, die gesamten
Verdunstungsverluste ausgleichende Wasser. Overall, the method steps described above result
a wastewater-free operation of the hot-dip galvanizing process based on
thus avoiding environmental pollution. It is only necessary
to replace lost water with unavoidable evaporation losses.
If this water is not in
- TT
- TransportsystemTransport system
- 1a1a
- AufgabestationLoading station
- 1b1b
- AufgabestationLoading station
- 1c1c
- AufgabestationLoading station
- 22nd
- Vorbehandlungsbad (Entfetten und Vorbeizen)Pretreatment bath (degreasing and pre-pickling)
- 33rd
- Vorbehandlungsbad (Beizen)Pretreatment bath (pickling)
- 44th
- Vorbehandlungsbad (Flußmittel)Pretreatment bath (flux)
- 55
- TrockenzoneDrying zone
- 66
- ZinkbadZinc bath
- 77
- BürstenstationBrush station
- 88th
- AbkühlbadCooling bath
- 9a9a
- EntnahmestationRemoval station
- 9b9b
- EntnahmestationRemoval station
- 9c9c
- EntnahmestationRemoval station
Claims (6)
- Process for the hot-dip galvanization in particular of long and slender components after they have passed through at least one degreasing, pickling and flux bath, characterized in that the components are fed in succession, by means of a conveyor system rotating in a continuous cycle, to pre-treatment baths (2, 3, 4) which are arranged one behind the other in the direction of transport and of which at least one bath carries out a plurality of pre-treatment steps simultaneously and which are all kept at a temperature which is higher than room temperature and are connected to at least one suction device for the vapours formed.
- Process according to Claim 1, with a cooling stage for the galvanized components connected downstream of the galvanization process, characterized in that at least some of the heat for heating the pre-treatment baths (2, 3, 4) is generated by recovery of the heat which is released when the galvanized components are cooled.
- Process according to Claim 1 or 2, characterized in that the heat contained in the vapours extracted from the pre-treatment baths (2, 3, 4) is used for partial heating of the air required for drying the pre-treated components prior to galvanization.
- Process according to at least one of Claims 1 to 3, characterized in that the heat released in the galvanization process is recovered in order to heat the pre-treatment baths (2, 3, 4) and/or to dry the pretreated components.
- Process according to at least one of Claims 1 to 4, characterized in that the water used in the aqueous solutions of the pre-treatment baths (2, 3, 4) is guided through a closed circuit, and the treatment medium of each individual pre-treatment bath (2, 3, 4) is circulated in a superposed circuit, and -foreign materials entrained by the components are removed from the treatment medium and are either returned to the previous stage or are fed for separate utilization.
- Process according to Claim 5, with cooling of the galvanized components in a water bath (8), characterized in that the water required for filling the pre-treatment baths (2, 3, 4) is removed from the water bath (8).
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SI9630127T SI0826788T1 (en) | 1996-08-30 | 1996-08-30 | Galvanizing method |
| DE29623455U DE29623455U1 (en) | 1996-08-30 | 1996-08-30 | Plant for hot-dip galvanizing |
| ES96113879T ES2142004T3 (en) | 1996-08-30 | 1996-08-30 | PROCEDURE FOR GALVANIZING BY HOT DIPPING. |
| DE59604052T DE59604052D1 (en) | 1996-08-30 | 1996-08-30 | Hot-dip galvanizing process |
| EP96113879A EP0826788B1 (en) | 1996-08-30 | 1996-08-30 | Galvanizing method |
| DK96113879T DK0826788T3 (en) | 1996-08-30 | 1996-08-30 | Method of hot-dip galvanizing |
| AT96113879T ATE188260T1 (en) | 1996-08-30 | 1996-08-30 | HOT DIP GALVANIZING PROCESS |
| RU97114925A RU2141003C1 (en) | 1996-08-30 | 1997-08-29 | Process of hot-dip galvanizing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96113879A EP0826788B1 (en) | 1996-08-30 | 1996-08-30 | Galvanizing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0826788A1 EP0826788A1 (en) | 1998-03-04 |
| EP0826788B1 true EP0826788B1 (en) | 1999-12-29 |
Family
ID=8223144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96113879A Expired - Lifetime EP0826788B1 (en) | 1996-08-30 | 1996-08-30 | Galvanizing method |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0826788B1 (en) |
| AT (1) | ATE188260T1 (en) |
| DE (2) | DE29623455U1 (en) |
| DK (1) | DK0826788T3 (en) |
| ES (1) | ES2142004T3 (en) |
| RU (1) | RU2141003C1 (en) |
| SI (1) | SI0826788T1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2536733C1 (en) * | 2013-05-14 | 2014-12-27 | Общество С Ограниченной Ответственностью "Евростандарт" | Application of coating on long-length metal article from melt |
| DE102022102291A1 (en) | 2022-02-01 | 2023-08-03 | The Coatinc Company Holding GmbH | Galvanizing plant and method for galvanizing piece goods |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2852410A (en) * | 1954-03-16 | 1958-09-16 | Republic Steel Corp | Use of titanium article support for hot dip galvanizing apparatus |
| GB1433019A (en) * | 1973-06-26 | 1976-04-22 | Turner Lisle Ltd | Galvanizing plant |
| JPS59211563A (en) * | 1983-05-16 | 1984-11-30 | Marushiyou Kogyo Kk | Automatic dipping device |
| DE3409935C1 (en) * | 1983-11-11 | 1985-04-18 | Hoesch Ag, 4600 Dortmund | Method and device for hot-galvanising ribbed tubes |
| JPH079055B2 (en) * | 1990-02-21 | 1995-02-01 | 新日本製鐵株式会社 | Method for producing galvannealed steel sheet |
-
1996
- 1996-08-30 EP EP96113879A patent/EP0826788B1/en not_active Expired - Lifetime
- 1996-08-30 SI SI9630127T patent/SI0826788T1/en not_active IP Right Cessation
- 1996-08-30 DE DE29623455U patent/DE29623455U1/en not_active Expired - Lifetime
- 1996-08-30 DE DE59604052T patent/DE59604052D1/en not_active Expired - Fee Related
- 1996-08-30 AT AT96113879T patent/ATE188260T1/en not_active IP Right Cessation
- 1996-08-30 ES ES96113879T patent/ES2142004T3/en not_active Expired - Lifetime
- 1996-08-30 DK DK96113879T patent/DK0826788T3/en active
-
1997
- 1997-08-29 RU RU97114925A patent/RU2141003C1/en active
Also Published As
| Publication number | Publication date |
|---|---|
| DE29623455U1 (en) | 1998-08-13 |
| DK0826788T3 (en) | 2000-06-13 |
| ES2142004T3 (en) | 2000-04-01 |
| DE59604052D1 (en) | 2000-02-03 |
| EP0826788A1 (en) | 1998-03-04 |
| SI0826788T1 (en) | 2000-04-30 |
| RU2141003C1 (en) | 1999-11-10 |
| ATE188260T1 (en) | 2000-01-15 |
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