DE1496742A1 - Cyanide-free alkaline electrolyte for the deposition of high-gloss zinc coatings - Google Patents

Cyanide-free alkaline electrolyte for the deposition of high-gloss zinc coatings

Info

Publication number
DE1496742A1
DE1496742A1 DE19661496742 DE1496742A DE1496742A1 DE 1496742 A1 DE1496742 A1 DE 1496742A1 DE 19661496742 DE19661496742 DE 19661496742 DE 1496742 A DE1496742 A DE 1496742A DE 1496742 A1 DE1496742 A1 DE 1496742A1
Authority
DE
Germany
Prior art keywords
cyanide
deposition
gloss
alkaline electrolyte
zinc coatings
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.)
Pending
Application number
DE19661496742
Other languages
German (de)
Inventor
Georg Biechl
Immel Dr Waldemar
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.)
Blasberg & Co KG Friedr GmbH
Original Assignee
Blasberg & Co KG Friedr GmbH
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 Blasberg & Co KG Friedr GmbH filed Critical Blasberg & Co KG Friedr GmbH
Publication of DE1496742A1 publication Critical patent/DE1496742A1/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D233/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings
    • C07D233/04—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
    • C07D233/06—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, directly attached to ring carbon atoms
    • C07D233/08—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, directly attached to ring carbon atoms with alkyl radicals, containing more than four carbon atoms, directly attached to ring carbon atoms
    • C07D233/12—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, directly attached to ring carbon atoms with alkyl radicals, containing more than four carbon atoms, directly attached to ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms
    • C07D233/14—Radicals substituted by oxygen atoms
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/22—Electroplating: Baths therefor from solutions of zinc

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Electroplating And Plating Baths Therefor (AREA)

Description

Eyanidfreier alkalischer Elektrolyt zur Abscheidung hochglänzender Zinküberzüge Die Erfindung betrifft einen Elektrolyt, mit dem es möglich ist, aus alkalischen nicht cyanidischen Lösungen hochglänzende nicht spröde Zinkniederschläge abzuscheiden. Der besondere Vorteil ist in der Nichtverwendung giftiger Cyanide zu sehen, woraus sich ganz besondere wirtschaftliche Vorteile bei der Abwasserbehandlung ergeben. Eyanide-free alkaline electrolyte for the deposition of high-gloss Zinc coatings The invention relates to an electrolyte with which it is possible from alkaline, non-cyanidic solutions, high-gloss, non-brittle zinc precipitates to be deposited. The particular advantage is that no toxic cyanides are used to see what the particular economic advantages of wastewater treatment are result.

Während es bereits in der Praxis möglich ist, die Glanzverzinkung von roll- und schüttbaren Massenartikeln in Trommelapparaten aus cyanidfreien alkalischen Lösungen durchzuführen, gelang es bisher nicht, einen alkalischen cyanidfreien Elektrolyten für die Anwendung in Wannenbädern zu entwickeln, der den bekannten cyanidischen äquivalent ist.While it is already possible in practice, bright galvanizing of rollable and pourable mass-produced articles in drum machines made of cyanide-free alkaline To carry out solutions, it was not previously possible to use an alkaline cyanide-free electrolyte for use in bath tubs to develop the well-known cyanidic is equivalent.

Bekanntlich führt die Abscheidung aus Zinkatelektrolyten trotz bekannter Glanzzusätze zu matten dunklen und schwammigen Zinküberzügen.It is known that the deposition from zincate electrolytes leads despite known Gloss additives for matt, dark and spongy zinc coatings.

Es wurde nun gefunden, daß es gelingt, durch Zusatz von erfindungsgemäßen Imidazoliniumverbindungen aus zinkathaltigen Lösungen hochglänzende duktile und festhaftende Zinkniederschläge abzuscheiden.It has now been found that it is possible by adding inventive Imidazolinium compounds from zincate solutions high-gloss ductile and to separate firmly adhering zinc precipitates.

Es wurde weiterhin gefunden, daß die erfindungsgemäßen Verbindungen neben den bekannten oberflächenaktiven Eigenschaften auch ein ausreichen des Komplexbindevermögen für Zinkionen im alkalischen Medium besitzen, wodurch die besondere Wirkung erklärt wird Wie schon eingangs erwähnt, lassen sich bei Verwendung des erfindungsgemäßen Elektrolyten selbst profilierte Artikel in Wannenbädern einwandfrei glanzverzinken. Die Abscheidung der Zinküberzüge wird bevorzugt bei Zimmertemperatmr vorgenommen. Die anzuwendende kathodische Stromausbeute liegt zwischen 1 - 4 A/dm2. Die Bäder können mit und ohne Warenbewegung gefahren werden.It has also been found that the compounds according to the invention In addition to the known surface-active properties, there is also sufficient complex binding capacity for zinc ions in an alkaline medium, which explains the special effect As already mentioned at the outset, when using the inventive Electrolytes, even profiled articles in bath tubs, are perfectly bright galvanized. The zinc coatings are preferably deposited at room temperature. The applicable cathodic current yield is between 1 - 4 A / dm2. The baths can be operated with and without movement of goods.

Neben der Verwendung in Wannenbädern eignet sich der Elektrolyt auch zur Glanzverzinkung roll- und schüttbarer Massenartikel in Trommelbädern.In addition to being used in bath tubs, the electrolyte is also suitable for bright galvanizing of rollable and pourable mass-produced articles in drum baths.

Claims (1)

Beispiel: 100 g/l Zinksulfat 150 g/l Ätznatron 15 g/l 2-Heptyl-3-hydroxyäthyl-3-hydroxypropylnatriumsulfonatimidazoliniumhydroxyd 0,5 g/l Piperonal 0,5 g/l Gelatine Aus diesem Elektrolyten scheidet man bei Zimmertemperatur und einer Stromdichte von 2 A/dm2 in 15 Minuten 7 - 8 Mikron eines hochglänzenden duktilen Zinküberzuges ab, der sich mit den üblichen Chromatierungslösungen nachbehandeln läßt0 patentanspruch : Alkalisches, cyanidfreies Zinkbad, bestehend aus einem Zinksalz, Ätzalkali, sowie bekannten Glanzmitteln, dadurch gekennzeichnet, daß es Imidazoliniumverbindungen der nachfolgenden allgemeinen Strukturformel enthält wobei R1 einen gesättigten oder ungesättigten Xohlenwasserstoffrest, ein Alkanolsulfonat und R3 einen kurzkettigen aliphatischen Alkohol darstellen.Example: 100 g / l zinc sulfate 150 g / l caustic soda 15 g / l 2-heptyl-3-hydroxyethyl-3-hydroxypropyl sodium sulfonate imidazolinium hydroxide 0.5 g / l piperonal 0.5 g / l gelatin Current density of 2 A / dm2 in 15 minutes from 7 - 8 microns of a high-gloss ductile zinc coating, which can be treated with the usual chromating solutions Contains imidazolinium compounds of the general structural formula below where R1 is a saturated or unsaturated hydrocarbon radical, an alkanol sulfonate and R3 is a short-chain aliphatic alcohol.
DE19661496742 1966-11-08 1966-11-08 Cyanide-free alkaline electrolyte for the deposition of high-gloss zinc coatings Pending DE1496742A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB0089719 1966-11-08

Publications (1)

Publication Number Publication Date
DE1496742A1 true DE1496742A1 (en) 1969-07-31

Family

ID=6984901

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19661496742 Pending DE1496742A1 (en) 1966-11-08 1966-11-08 Cyanide-free alkaline electrolyte for the deposition of high-gloss zinc coatings

Country Status (1)

Country Link
DE (1) DE1496742A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4113583A (en) * 1976-04-27 1978-09-12 Dipsol Chemical Company, Ltd. Method for brightening the electrodeposits of zinc from alkaline zinc electroplating baths

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4113583A (en) * 1976-04-27 1978-09-12 Dipsol Chemical Company, Ltd. Method for brightening the electrodeposits of zinc from alkaline zinc electroplating baths

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