EP0012301B1 - Flux for dry galvanization - Google Patents
Flux for dry galvanization Download PDFInfo
- Publication number
- EP0012301B1 EP0012301B1 EP79104813A EP79104813A EP0012301B1 EP 0012301 B1 EP0012301 B1 EP 0012301B1 EP 79104813 A EP79104813 A EP 79104813A EP 79104813 A EP79104813 A EP 79104813A EP 0012301 B1 EP0012301 B1 EP 0012301B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flux
- zinc
- sodium
- potassium
- ammonium chloride
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- 230000004907 flux Effects 0.000 title claims abstract description 39
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000011701 zinc Substances 0.000 claims abstract description 23
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000011734 sodium Substances 0.000 claims abstract description 19
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 19
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 15
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 15
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 12
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 12
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 12
- 239000011591 potassium Substances 0.000 claims abstract description 12
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims abstract description 10
- 235000005074 zinc chloride Nutrition 0.000 claims abstract description 5
- 239000011592 zinc chloride Substances 0.000 claims abstract description 5
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical class [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 4
- 150000004679 hydroxides Chemical class 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims abstract description 4
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims abstract description 3
- 235000011118 potassium hydroxide Nutrition 0.000 claims abstract 2
- 235000011121 sodium hydroxide Nutrition 0.000 claims abstract 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
- 235000002639 sodium chloride Nutrition 0.000 claims description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical class [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims 1
- 235000011164 potassium chloride Nutrition 0.000 claims 1
- 238000005246 galvanizing Methods 0.000 description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 19
- 239000002253 acid Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 10
- 239000000243 solution Substances 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 9
- 238000005554 pickling Methods 0.000 description 8
- 238000001035 drying Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 159000000014 iron salts Chemical class 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 150000001805 chlorine compounds Chemical class 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 150000002506 iron compounds Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- 150000003752 zinc compounds Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/30—Fluxes or coverings on molten baths
Definitions
- the iron objects to be galvanized must be subjected to a pretreatment prior to immersion in the liquid zinc, which essentially consists of degreasing, pickling the surfaces with acids, especially hydrochloric acid, rinsing in water, immersing them in an aqueous flux solution and then There is drying.
- the iron salts carried into the flux bath from the standing sink generally do not interfere under the conditions mentioned, since they rarely exceed concentrations of 20 g Fe / l. In contrast, the acid carried into the flux bath should be removed for the reasons already mentioned.
- the present invention was therefore based on the object of creating storable and non-decomposing zinc chloride and ammonium chloride fluxes for dry galvanizing, which have good flow properties, the aqueous solutions of which are capable of introducing acid, in particular hydrochloric acid, even in relatively large amounts Neutralize quickly and completely without leaving insoluble residues and convert them into compounds that do not negatively affect the properties of the flux.
- the fluxes according to the invention do not release ammonia when stored in closed containers. No disturbing smell of ammonia is perceptible even when entering the aqueous flow solutions or after prolonged exposure to moist air.
- the molar ratio zinc: sodium or potassium in the fluxes according to the invention is preferably from 1: 0.02 to 1: 1.5.
- the ammonium chloride content is preferably 0.05 to 2 moles per mole of zinc.
- the fluxes can also contain the chlorides of sodium or potassium, care being taken not to change the molar ratio of zinc: sodium or potassium and also from 1: 0.02 to 1: 2, preferably from 1: 0, 02 to 1: 1.5, with the proviso that the content of the two chlorides is a maximum of 1.2 moles per mole of zinc.
- the flux can also contain other conventional additives, such as anti-corrosion agents, wetting agents, and basic zinc compounds.
- the galvanized material is rinsed in hydrochloric acid in a standing sink, the acidity of which is on average 3% by weight.
- the towing losses from the standing sink through the galvanized material are 51 / t throughput.
- the objects to be galvanized are immersed in the standing sink in an aqueous flux solution of 70 ° C, dried and galvanized.
- a solid flux is added to the flux bath, consisting of 48% by weight ZnCl 2 , 32% by weight NH 4 Cl and 20% by weight K 2 CO 3 (molar ratio Zn: NH 4 CI: K 1: 1.7: 0.8).
- the amount of flux added corresponds to the flux carried over by the galvanizing material.
- the average pH of the flux solution is 4.5, the iron content is 16 g / l.
- the quality of the goods after galvanizing is an.
- the average pH and the iron content of the solution correspond to those of Example 2. A perfectly galvanized product is obtained.
- the galvanized goods are rinsed in hydrochloric acid in a standing sink, the acidity of which is 2.2% on average.
- the towing losses from the standing sink through the galvanized material are 5.4 I / t throughput.
- the objects to be galvanized are immersed in an aqueous flux solution in the standing sink, dried in a drying oven and galvanized.
- a solid flux is added to the flux bath from time to time, namely in a quantity of 2 kg / t of galvanized material.
- the zinc oxide is not present in the flux as such but as basic zinc chloride or zinc amine chloride.
- the average pH of the flux solution is 4.8, the iron content is 11 g / l. A good galvanized product will be received.
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
Abstract
Description
Bei der Feuerverzinkung nach dem Trockenverfahren müssen die zu verzinkenden eisernen Gegenstände vor dem Eintauchen in das flüssige Zink einer Vorbehandlung unterzogen werden, die im wesentlichen aus Entfetten, Beizen der Oberflächen mit Säuren, insbesondere Salzsäure, Spülen in Wasser, Eintauchen in eine wässrige Flussmittellösung und anschliessendem Trocknen besteht.In hot-dip galvanizing using the dry process, the iron objects to be galvanized must be subjected to a pretreatment prior to immersion in the liquid zinc, which essentially consists of degreasing, pickling the surfaces with acids, especially hydrochloric acid, rinsing in water, immersing them in an aqueous flux solution and then There is drying.
Das Spülen der gebeizten Gegenstände ist erforderlich, um die an der Oberfläche des Beizgutes anhaftenden Beizflüssigkeitsreste, die erhebliche Mengen an Säure und Eisensalzen enthalten, weitgehend zu entfernen. Ein Verzicht auf diese Zwischenspülung würde bei der Trockenverzinkung zu einer starken Anreicherung von freier Säure und von Eisensalzen in der Flussmittellösung führen. Die hohe Eisensalz-Konzentration bedingt eine starke Verschlechterung der Abkochfähigkeit des Flussmittels und führt damit verbunden leicht zu Fehlverzinkungen. Ausserdem fällt beim Verzinken mehr Hartzink an und die Zinkasche enthält einen unerwünscht hohen Eisengehalt. Auch freie Säure ist im Flussmittelbad im allgemeinen unerwünscht. Bei ausreichend hohen Temperaturen wird sie nämlich im Trockenofen praktisch quantitativ abgespalten und mit der Trockenluft emittiert. Da sie sehr korrosiv ist, muss nicht nur der Trockenofen, sondern es müssen auch die Einrichtungen zur Abluftabführung aus korrosionsbeständigen Materialien angefertigt werden. Auf der anderen Seite wird bei vielen Verzinkereien das Verzinkungsgut wegen ungenügender Trocknungskapazität nicht ausreichend getrocknet, so dass in diesen Fällen die mit dem Gut aus dem Flußmittelbad ausgeschleppte Säure mehr oder weniger vollständig in das Zinkbad eingebracht wird, was zu erhöhter Aschebildung führt, wobei letztere wiederum unter diesen speziellen Bedingungen am Verzinkungsgut haftet, was Fehlverzinkungen zur Folge hat.It is necessary to rinse the pickled objects in order to largely remove the pickling liquid residues adhering to the surface of the pickling material and which contain considerable amounts of acid and iron salts. Dispensing with this intermediate rinse would lead to a strong accumulation of free acid and iron salts in the flux solution in the case of dry galvanizing. The high concentration of iron salt causes a severe deterioration in the ability of the flux to boil and, as a result, easily leads to incorrect galvanizing. In addition, more hard zinc is produced during galvanizing and the zinc ash contains an undesirably high iron content. Free acid is also generally undesirable in the flux bath. At sufficiently high temperatures, it is split off practically quantitatively in the drying oven and emitted with the dry air. Since it is very corrosive, not only the drying oven must be made, but also the exhaust air extraction devices must be made of corrosion-resistant materials. On the other hand, in many galvanizing plants, the galvanizing material is not sufficiently dried due to insufficient drying capacity, so that in these cases the acid carried off with the material from the flux bath is more or less completely introduced into the zinc bath, which leads to increased ash formation, the latter in turn adheres to the galvanizing material under these special conditions, which results in incorrect galvanizing.
Durch den, wie oben dargelegt, notwendigen Spülvorgang des Verzinkungsgutes zwischen Säurebeize und Flussmittelbad fallen saure Eisen-und in manchen Fällen Zinksalze enthaltende Abwässer an, die im Gegensatz zu den Abfall-Beizsäuren wegen ihrer relativ geringen Eisenkonzentration nicht auf andere Eisenverbindungen aufgearbeitet werden können, die aber andererseits wegen der bestehenden Umweltauflagen nicht in Vorfluter oder öffentliche Abwässer abgegeben werden dürfen. Die Entsorgung dieser Abwässer ist dadurch mit einem erheblichen Kostenaufwand verbunden, zu welchem sich bei den meist üblichen Durchlaufspülbädern die Kosten für einen entsprechend hohen Wasserverbrauch addieren.As explained above, the rinsing process of the galvanized material between the acid pickle and the flux bath results in acidic iron and in some cases zinc salts containing wastewater, which, in contrast to the waste pickling acids, cannot be processed for other iron compounds because of their relatively low iron concentration but on the other hand, because of the existing environmental regulations, they must not be released into receiving water or public wastewater. The disposal of this wastewater is associated with a considerable cost, to which the costs for a correspondingly high water consumption are added in the most usual continuous rinsing baths.
Es sind Verfahren bekannt geworden, bei denen keine sauren Abwässer aus der Spüle anfallen. So kann beispielsweise letztere als Standspüle benutzt werden. Bei der Zugabe von Frischsäure in das Beizbecken wird das zur Verdünnung derselben erforderliche Wasser der Standspüle entnommen und in letztere die entsprechende Menge Frischwasser zugegeben. Da in den meisten Fällen die dem Beizbecken aus der Standspüle zugeführte Wassermenge deutlich über der Säuremenge liegt, die mit dem Beizgut aus dem Beizbecken in die Standspüle eingeschleppt wird, ergeben sich in der Standspüle Säure- und Eisenkonzentrationen, die meist nur bei 10 bis 30% derjenigen im Beizbecken liegen.Methods have become known in which no acid waste water is produced from the sink. For example, the latter can be used as a standing sink. When fresh acid is added to the pickling tank, the water required to dilute it is removed from the standing sink and the corresponding amount of fresh water is added to the sink. Since in most cases the amount of water supplied to the pickling tank from the standing sink is significantly higher than the amount of acid that is brought into the standing sink from the pickling tank, acid and iron concentrations result in the standing sink, which are usually only around 10 to 30% of those lying in the pickling tank.
Die aus der Standspüle in das Fluxbad eingeschleppten Eisensalze stören unter den erwähnten Voraussetzungen im allgemeinen nicht, da sie nur in seltenen Fällen Konzentrationen von 20 g Fe/I überschreiten. Die in das Flussmittelbad eingeschleppte Säure sollte dagegen aus den bereits erwähnten Gründen entfernt werden.The iron salts carried into the flux bath from the standing sink generally do not interfere under the conditions mentioned, since they rarely exceed concentrations of 20 g Fe / l. In contrast, the acid carried into the flux bath should be removed for the reasons already mentioned.
Der vorliegenden Erfindung lag daher die Aufgabe zugrunde, lagerfähige und sich nicht zersetzende Zinkchlorid- und Ammoniumchlorid-flussmittel für die Trockenverzinkung zu schaffen, die gute Flusseigenschaften aufweisen, deren wäßerige Lösungen in der Lage sind, eingeschleppte Säure, insbesondere Salzsäure, auch bei grösseren Mengen sehr schenll und vollständig ohne Hinterlassung unlöslicher Rückstände zu neutralisieren und in Verbindungen umzuwandeln, die die Eigenschaften der Flussmittel nicht negativ beeinflussen.The present invention was therefore based on the object of creating storable and non-decomposing zinc chloride and ammonium chloride fluxes for dry galvanizing, which have good flow properties, the aqueous solutions of which are capable of introducing acid, in particular hydrochloric acid, even in relatively large amounts Neutralize quickly and completely without leaving insoluble residues and convert them into compounds that do not negatively affect the properties of the flux.
Es wurde nun gefunden, dass diese Aufgabe bei einem Zinkchlorid und Ammoniumchlorid enthaltenden Flussmittel für die Trockenverzinkung dadurch gelöst werden kann, dass sie zusätzlich Hydroxide und Carbonate des Natriums oder Kaliums einzeln oder im Gemisch enthalten, mit der Massgabe, dass das Molverhältnis Zink : Natrium bzw. Kalium zwischen 1 : 0,02 und 1 : 2 liegt, je Mol Zink 0,05 bis 4 Mole Ammoniumchlorid enthalten sind und der Gesamtgehalt an Ammoniumchlorid und den Hydroxiden des Natriums oder Kaliums insgesamt 60 Gew.-% nicht übersteigt.It has now been found that this problem can be solved with a flux for dry galvanizing containing zinc chloride and ammonium chloride by additionally containing hydroxides and carbonates of sodium or potassium individually or in a mixture, with the proviso that the molar ratio zinc: sodium or Potassium is between 1: 0.02 and 1: 2, 0.05 to 4 moles of ammonium chloride are contained per mole of zinc and the total content of ammonium chloride and the hydroxides of sodium or potassium does not exceed a total of 60% by weight.
Überraschenderweise geben die erfindungsgemässen Flussmittel trotz des basischen Charakters der Zusätze bei der Lagerung in geschlossenen Gebinden, keinen Ammoniak ab. Auch bei der Eintragung in die wässrigen Flusslösungen oder bei längerer Einwirkung von feuchter Luft ist kein störender Ammoniakgeruch wahrnehmbar.Surprisingly, despite the basic character of the additives, the fluxes according to the invention do not release ammonia when stored in closed containers. No disturbing smell of ammonia is perceptible even when entering the aqueous flow solutions or after prolonged exposure to moist air.
Das Molverhältnis Zink:Natrium bzw. Kalium in den erfindungsgemässen Flussmitteln beträgt vorzugsweise von 1:0,02 bis 1:1,5. Der Gehalt an Ammoniumchloriden beträgt vorzugsweise 0,05 bis 2 Mol je Mol Zink.The molar ratio zinc: sodium or potassium in the fluxes according to the invention is preferably from 1: 0.02 to 1: 1.5. The ammonium chloride content is preferably 0.05 to 2 moles per mole of zinc.
Die Flussmittel können weiterhin auch die Chloride des Natriums oder Kaliums enthalten, wobei darauf zu achten ist, dass das Molverhältnis Zink: Natrium bzw. Kalium nicht geändert wird und ebenfalls von 1:0,02 bis 1:2, vorzugsweise von 1:0,02 bis 1:1,5 beträgt, mit der Massgabe, dass der Gehalt an den beiden Chloriden maximal 1,2 Mol je Mol Zink beträgt.The fluxes can also contain the chlorides of sodium or potassium, care being taken not to change the molar ratio of zinc: sodium or potassium and also from 1: 0.02 to 1: 2, preferably from 1: 0, 02 to 1: 1.5, with the proviso that the content of the two chlorides is a maximum of 1.2 moles per mole of zinc.
Neben diesen Hauptkomponenten des erfindungsgemässen Flussmittels, die zusammen mindestens etwa 80 Gew.-% ausmachen, kann das Flussmittel auch andere übliche Zusätze, wie Korrosionsschutzmittel, Netzmittel, basisch reagierende Zinkverbindungen enthalten.In addition to these main components of the flux according to the invention, which together make up at least about 80% by weight, the flux can also contain other conventional additives, such as anti-corrosion agents, wetting agents, and basic zinc compounds.
In einer Verzinkungsanlage wird das Verzinkungsgut nach dem Beizen in Salzsäure in einer Standspüle gespült, deren Säuregehalt im Mittel bei 3 Gew.-% liegt. Die Ausschleppverluste aus der Standspüle durch das Verzinkungsgut liegen bei 51/t Durchsatz. Die zu verzinkenden Gegenstände werden nach dem Spülen in der Standspüle in eine wässrige Flussmittellösung von 70 °C getaucht, getrocknet und verzinkt. Dem Flussmittelbad wird in gewissen Zeitabständen ein festes Flussmittel zugegeben, das aus 48 Gew.-% ZnCl2, 32 Gew.-% NH4Cl und 20 Gew.-% K2CO3 (Molverhältnis Zn:NH4CI:K 1:1,7:0,8) besteht. Die zugegebene Flussmittelmenge entspricht dem durch das Verzinkungsgut ausgeschleppten Flussmittel. Sie beträgt 1,8 kg/t Verzinkungsgut. Der pH-Wert in der Flussmittellösung zeigt nur geringe Schwankungen und liegt im Mittel bei 5, woraus sich ergibt, dass die eingeschleppte Säure vollständig neutralisiert wird. Der Eisengehalt der Flussmittellösung beträgt 13 g/I und zeigt auch über einen längeren Zeitraum nur relativ geringe Abweichungen in beiden Richtungen von dem genannten Wert. Die Qualität des Gutes nach dem Verzinken ist einwandfrei.In a galvanizing plant, the galvanized material is rinsed in hydrochloric acid in a standing sink, the acidity of which is on average 3% by weight. The towing losses from the standing sink through the galvanized material are 51 / t throughput. After rinsing, the objects to be galvanized are immersed in the standing sink in an aqueous flux solution of 70 ° C, dried and galvanized. At certain intervals, a solid flux is added to the flux bath, consisting of 48% by weight ZnCl 2 , 32% by weight NH 4 Cl and 20% by weight K 2 CO 3 (molar ratio Zn: NH 4 CI: K 1: 1.7: 0.8). The amount of flux added corresponds to the flux carried over by the galvanizing material. It is 1.8 kg / t galvanizing material. The pH in the flux solution shows only slight fluctuations and is on average 5, which means that the acid introduced is completely neutralized. The iron content of the flux solution is 13 g / I and shows only relatively minor deviations from the stated value in both directions over a longer period of time. The quality of the goods after galvanizing is impeccable.
In einer ebenfalls mit Standspüle arbeitenden Verzinkerei beträgt der mittlere Salzsäuregehalt in der Standspüle 3,7%, die Ausschleppverluste aus der Standspüle liegen bei 6I/t Verzinkungsgut. Dem Fluxbad werden zur Aufrechterhaltung einer gleichbleibenden Konzentration 2,5 kg/t Verzinkungsgut eines Flussmittels, bestehend aus 73,5 Gew.-% ZnCl2, 11 Gew.-% NH4Cl, 12,5 Gew.-% KOH und 3 Gew.-% NaOH (Molverhältnis ZnCl2:NH4Cl:Na+K=1:0,38:0,55) zugegeben. Der pH-Wert der Flussmittellösung liegt im Mittel bei 4,5, der Eisengehalt bei 16 g/l. Die Qualität des Gutes nach dem Verzinken ist einwandfrei.In a galvanizing plant, which also works with a standing sink, the average hydrochloric acid content in the standing sink is 3.7%, the towage losses from the standing sink are 6I / t galvanizing material. To maintain a constant concentration, the flux bath contains 2.5 kg / t of galvanizing material from a flux, consisting of 73.5% by weight of ZnCl 2 , 11% by weight of NH 4 Cl, 12.5% by weight of KOH and 3% by weight .-% NaOH (molar ratio ZnCl 2 : NH 4 Cl: Na + K = 1: 0.38: 0.55) added. The average pH of the flux solution is 4.5, the iron content is 16 g / l. The quality of the goods after galvanizing is impeccable.
In der in Beispiel 1 beschriebenen Verzinkungsanlage wird statt des dort angeführten Flussmittels ein solches, bestehend aus 47 Gew.-% ZnCl2, 37 Gew.-% NH4CI und 16 Gew.-% KOH (Mol-Verhältnis Zn:NH4CI:K=1:2:0,83) verwendet. Alle sonstigen Bedingungen entsprechen denen des Beispiels 1. Es wird ein fehlerfrei verzinktes Gut erhalten.In the galvanizing plant described in Example 1, instead of the flux listed there, one consisting of 47% by weight ZnCl 2 , 37% by weight NH 4 CI and 16% by weight KOH (molar ratio Zn: NH 4 CI : K = 1: 2: 0.83) is used. All other conditions correspond to those of example 1. A good galvanized product is received.
In der in Beispiel 2 beschriebenen Verzinkerei wird ein Flussmittel eingesetzt, das aus 66 Gew.- % ZnCl2, 8 Gew.-% NH4CI, 16 Gew.-% Na2CO3 und 10 Gew.-% NaCI besteht (Molverhältnis Zn : NH4Cl: Na=1:0,31:0,97).In the galvanizing plant described in Example 2, a flux is used which consists of 66% by weight ZnCl 2 , 8% by weight NH 4 CI, 16% by weight Na 2 CO 3 and 10% by weight NaCl (molar ratio Zn: NH 4 Cl: Na = 1: 0.31: 0.97).
Der mittlere pH-Wert und der Eisengehalt der Lösung entsprechen denen des Beispiels 2. Es wird ein einwandfrei verzinktes Gut erhalten.The average pH and the iron content of the solution correspond to those of Example 2. A perfectly galvanized product is obtained.
In einer Verzinkungsanlage wird das Verzinkungsgut nach dem Beizen in Salzsäure in einer Standspüle gespült, deren Säuregehalt im Mittel bei 2,2% liegt. Die Ausschleppverluste aus der Standspüle durch das Verzinkungsgut liegen bei 5,4 I/t Durchsatz. Die zu verzinkenden Gegenstände werden nach dem Spülen in der Standspüle in eine wässrige Flussmittellösung getaucht, in einem Trockenofen getrocknet und verzinkt. Dem Flussmittelbad wird zur Aufrechterhaltung der Konzentration von Zeit zu Zeit ein festes Flussmittel zugegeben und zwar in einer Menge von 2 kg/t durchgesetztes Verzinkungsgut. Das Flussmittel besteht aus 55% ZnCl2, 36,5% NH4Cl, 7,5% ZnO und 2% Soda. (Molverhältnis Zn:NH4CI:Na= 1:1,376:0,038.In a galvanizing plant, the galvanized goods are rinsed in hydrochloric acid in a standing sink, the acidity of which is 2.2% on average. The towing losses from the standing sink through the galvanized material are 5.4 I / t throughput. After rinsing, the objects to be galvanized are immersed in an aqueous flux solution in the standing sink, dried in a drying oven and galvanized. To maintain the concentration, a solid flux is added to the flux bath from time to time, namely in a quantity of 2 kg / t of galvanized material. The flux consists of 55% ZnCl 2 , 36.5% NH 4 Cl, 7.5% ZnO and 2% soda. (Zn: NH 4 CI: Na molar ratio = 1: 1.376: 0.038.
Das Zinkoxid liegt in dem Flussmittel nicht als solches sondern als basisches Zinkchlorid bzw. Zinkaminchlorid vor.The zinc oxide is not present in the flux as such but as basic zinc chloride or zinc amine chloride.
Der pH-Wert der Flussmittellösung liegt im Mittel bei 4,8, der Eisengehalt bei 11 g/l. Es wird ein fehlerfrei verzinktes Gut erhalten.The average pH of the flux solution is 4.8, the iron content is 11 g / l. A good galvanized product will be received.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT79104813T ATE858T1 (en) | 1978-12-06 | 1979-12-01 | FLUX FOR DRY GALVANIZING. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2852756 | 1978-12-06 | ||
| DE2852756A DE2852756B2 (en) | 1978-12-06 | 1978-12-06 | Flux for dry galvanizing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0012301A1 EP0012301A1 (en) | 1980-06-25 |
| EP0012301B1 true EP0012301B1 (en) | 1982-04-14 |
Family
ID=6056468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP79104813A Expired EP0012301B1 (en) | 1978-12-06 | 1979-12-01 | Flux for dry galvanization |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0012301B1 (en) |
| AT (1) | ATE858T1 (en) |
| DE (2) | DE2852756B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10134812C2 (en) * | 2001-07-17 | 2003-06-26 | Goldschmidt Ag Th | De-icing flux salt composition for flux baths |
| CN102873470B (en) * | 2012-08-02 | 2014-07-09 | 新兴铸管（浙江）铜业有限公司 | Flux for tinned copper wires and preparation method for flux |
| ES2851199T3 (en) * | 2013-07-03 | 2021-09-03 | Outokumpu Nirosta Gmbh | Procedure for coating flat steel products with a metallic protective layer |
| CN112226751B (en) * | 2020-09-03 | 2022-02-11 | 余姚市永林机械科技有限公司 | Plating assistant liquid and hot galvanizing process using same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE971244C (en) * | 1953-03-08 | 1958-12-31 | Basf Ag | Flux for hot-dip galvanizing, tin-plating and lead-plating |
| US2940870A (en) * | 1959-02-19 | 1960-06-14 | Hanson Van Winkle Munning Co | Method of hot dip galvanizing a ferrous metal |
| DE2317600C3 (en) * | 1973-04-07 | 1975-08-28 | Basf Ag, 6700 Ludwigshafen | Aqueous flux solutions for hot-dip galvanizing |
| US4140821A (en) * | 1976-03-05 | 1979-02-20 | International Lead Zinc Research Organization, Inc. | Process for preheating and preparing ferrous metal for galvanizing |
-
1978
- 1978-12-06 DE DE2852756A patent/DE2852756B2/en not_active Withdrawn
-
1979
- 1979-12-01 DE DE7979104813T patent/DE2962529D1/en not_active Expired
- 1979-12-01 EP EP79104813A patent/EP0012301B1/en not_active Expired
- 1979-12-01 AT AT79104813T patent/ATE858T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ATE858T1 (en) | 1982-04-15 |
| DE2962529D1 (en) | 1982-05-27 |
| DE2852756B2 (en) | 1980-09-25 |
| DE2852756A1 (en) | 1980-06-12 |
| EP0012301A1 (en) | 1980-06-25 |
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