EP0012301B1 - Fondant pour galvanisation à sec - Google Patents

Fondant pour galvanisation à sec Download PDF

Info

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
Application number
EP79104813A
Other languages
German (de)
English (en)
Other versions
EP0012301A1 (fr
Inventor
Max Dr. Appl
Erfried Dr. Voelkl
Erich Dr. Giesler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Priority to AT79104813T priority Critical patent/ATE858T1/de
Publication of EP0012301A1 publication Critical patent/EP0012301A1/fr
Application granted granted Critical
Publication of EP0012301B1 publication Critical patent/EP0012301B1/fr
Expired legal-status Critical Current

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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.

Landscapes

  • 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)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)

Claims (3)

1. Fondants pour la galvanisation à sec, contenant du chlorure de zinc et du chlorure d'ammonium, caractérisés en ce qu'ils contiennent en outre des hydroxydes et carbonates du sodium ou du potassium, soit seuls, soit en mélanges, le rapport molaire Zn:Na ou K étant compris entre 1:0,02 et 1:2, la proportion du chlorure d'ammonium étant de 0,05 à 4 moles par mole de zinc et la teneur totale en chlorure d'ammonium et hydroxydes de sodium ou de potassium ne dépassant pas 60% en poids.
2. Fondants suivant la revendication 1, caractérisés en ce qu'ils contiennent en outre des chlorures de sodium et(ou) de potassium, le rapport molaire Zn:Na ou K étant compris entre 1:0,02 et 1:2 et la proportion maximale des chlorures étant de 1,2 mole par mole de zinc.
3. Fondants suivant l'une des revendications 1 et 2, caractérisés en ce que le rapport molaire Zn:Na ou K est compris entre 1:0,02 et 1:1,5 et la proportion du chlorure d'ammonium est de 0,05 à 2 moles par mole de zinc.
EP79104813A 1978-12-06 1979-12-01 Fondant pour galvanisation à sec Expired EP0012301B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79104813T ATE858T1 (de) 1978-12-06 1979-12-01 Flussmittel fuer die trockenverzinkung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2852756A DE2852756B2 (de) 1978-12-06 1978-12-06 Flußmittel für die Trockenverzinkung
DE2852756 1978-12-06

Publications (2)

Publication Number Publication Date
EP0012301A1 EP0012301A1 (fr) 1980-06-25
EP0012301B1 true EP0012301B1 (fr) 1982-04-14

Family

ID=6056468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79104813A Expired EP0012301B1 (fr) 1978-12-06 1979-12-01 Fondant pour galvanisation à sec

Country Status (3)

Country Link
EP (1) EP0012301B1 (fr)
AT (1) ATE858T1 (fr)
DE (2) DE2852756B2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10134812C2 (de) * 2001-07-17 2003-06-26 Goldschmidt Ag Th Enteisende Fluxsalz-Zusammensetzung für Fluxbäder
CN102873470B (zh) * 2012-08-02 2014-07-09 新兴铸管（浙江）铜业有限公司 一种镀锡铜丝用助焊剂及其制备方法
EP2821520B1 (fr) * 2013-07-03 2020-11-11 ThyssenKrupp Steel Europe AG Procédé de revêtement de produits plats en acier avec une couche de protection métallique
CN112226751B (zh) * 2020-09-03 2022-02-11 余姚市永林机械科技有限公司 一种助镀液及其使用该种助镀液的热镀锌工艺

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE971244C (de) * 1953-03-08 1958-12-31 Basf Ag Flussmittel fuer die Feuerverzinkung, -verzinnung und -verbleiung
US2940870A (en) * 1959-02-19 1960-06-14 Hanson Van Winkle Munning Co Method of hot dip galvanizing a ferrous metal
DE2317600C3 (de) * 1973-04-07 1975-08-28 Basf Ag, 6700 Ludwigshafen Wäßerige Flußmittellösungen für die Feuerverzinkung
US4140821A (en) * 1976-03-05 1979-02-20 International Lead Zinc Research Organization, Inc. Process for preheating and preparing ferrous metal for galvanizing

Also Published As

Publication number Publication date
DE2852756A1 (de) 1980-06-12
EP0012301A1 (fr) 1980-06-25
ATE858T1 (de) 1982-04-15
DE2962529D1 (en) 1982-05-27
DE2852756B2 (de) 1980-09-25

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