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DE679798C - Process for the electrolytic production of protective layers on workpieces - Google Patents

Process for the electrolytic production of protective layers on workpieces

Info

Publication number
DE679798C
DE679798C DEI62211A DEI0062211A DE679798C DE 679798 C DE679798 C DE 679798C DE I62211 A DEI62211 A DE I62211A DE I0062211 A DEI0062211 A DE I0062211A DE 679798 C DE679798 C DE 679798C
Authority
DE
Germany
Prior art keywords
acid
bath
workpieces
electrolytic production
magnesium
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
DEI62211A
Other languages
German (de)
Inventor
Dr-Ing Walter Mannchen
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Application granted granted Critical
Publication of DE679798C publication Critical patent/DE679798C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/38—Chromatising

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Description

Patentansprüche: „o Claims: " o

1. Verfahren zur elektrolytischen'Erzeugung von Schutzüberzügen auf Werkstücken aus Magnesium und dessen Legierungen nach Patent 671 978, dadurch gekennzeichnet, daß das Bad an Stelle van, vorzugsweise aber neben Sulfation Ionen der nachfolgenden Säuren, einzeln oder zu mehreren, enthält: Phosphorsäure, Borsäure, Cyansäure, schweflige Säure, Selensäure, selenige Säure, Wolframsäure, Vanadinsäure und Molybdänsäure.1. Process for electrolytic generation of protective coatings on workpieces made of magnesium and its alloys according to patent 671 978, thereby characterized in that the bath in place of van, but preferably in addition to sulfate ions, ions of the following acids, individually or several, contains: phosphoric acid, boric acid, cyanic acid, sulphurous acid, Selenic acid, selenous acid, tungstic acid, vanadic acid and molybdic acid.

2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Bad an Stelle oder neben Alkalisalzen der in Frage kommenden Säuren Magnesium- oder Mangansalz enthält.2. The method according to claim 1, characterized in that the bath in place or contains magnesium or manganese salts in addition to alkali salts of the acids in question.

Claims (1)

Gegenstand des Patents 671 978 ist ein Verfahren zur elektrolytischen Erzeugung von Schutzüberzügen auf Werkstücken aus Magnesium und dessen Legierungen, das dadurch gekennzeichnet ist, daß in einem Bade, das Chromat- und Sulfation, beide an Alkali gebunden, enthält, und dessen pH-Wert zwischen 3,5 und 6 liegt, das Werkstück gegen eine aus einem edleren Metall, z. ß. Stahl,Subject of the patent 671 978 discloses a process for electrolytic production of protective coatings on workpieces made of magnesium and its alloys, which is characterized in that, in a bath, the chromate and sulfate ion, containing both bound to alkaline, and its pH value is between 3.5 and 6, the workpiece against a made of a more noble metal, z. ß. Stole, ίο bestehende Elektrode kurzgeschlossen wird. In weiterer Ausgestaltung dieses Verfahrens wurde nun gefunden, daß an Stelle von, vorzugsweise aber zusammen mit Sulfation auch die Ionen anderer Säuren in den für die Behandlung zu verwendenden Lösungen anwesend sein können. Die hierfür in Frage kommenden Säuren sind Phosphorsäure, Borsäure, Cyansäure, schweflige Säure, Selensäure, selenige Säure, Wolframsäure, Vanadinsäure und Molybdänsäure, die in Form ihrer Alkali-, Magnesium- oder Mangansalze dem für die Behandlung verwendeten Bad zugesetzt werden, jedoch stets mit der Maßgabe, daß der pH-Wert des Bades, entsprechend dem Hauptpatent, zwischen 3,5 und 6 liegt.ίο the existing electrode is short-circuited. In a further embodiment of this process, it has now been found that instead of, but preferably together with, sulfate ion, the ions of other acids can also be present in the solutions to be used for the treatment. The acids in question for this are phosphoric acid, boric acid, cyanic acid, sulphurous acid, selenic acid, selenous acid, tungstic acid, vanadic acid and molybdic acid, which are added to the bath used for the treatment in the form of their alkali, magnesium or manganese salts, but always with them the proviso that the pH-value, is the bath, according to the main patent from 3.5 to 6. Im übrigen gelten für die Durchführung des neuen Verfahrens die im Hauptpatent gegebenen Anweisungen.For the rest, those given in the main patent apply to the implementation of the new process Instructions.
DEI62211A 1937-10-01 1938-08-13 Process for the electrolytic production of protective layers on workpieces Expired DE679798C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEI59181A DE671978C (en) 1937-10-01 1937-10-01 Process for the electrolytic production of protective coatings on workpieces made of magnesium and its alloys
GB18652/38A GB515648A (en) 1937-10-01 1938-06-23 Improvements in or relating to a method of producing coatings on magnesium or its alloys

Publications (1)

Publication Number Publication Date
DE679798C true DE679798C (en) 1939-08-15

Family

ID=25760474

Family Applications (2)

Application Number Title Priority Date Filing Date
DEI59181A Expired DE671978C (en) 1937-10-01 1937-10-01 Process for the electrolytic production of protective coatings on workpieces made of magnesium and its alloys
DEI62211A Expired DE679798C (en) 1937-10-01 1938-08-13 Process for the electrolytic production of protective layers on workpieces

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DEI59181A Expired DE671978C (en) 1937-10-01 1937-10-01 Process for the electrolytic production of protective coatings on workpieces made of magnesium and its alloys

Country Status (5)

Country Link
BE (1) BE430129A (en)
CH (1) CH209863A (en)
DE (2) DE671978C (en)
FR (1) FR841524A (en)
GB (1) GB515648A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL56619C (en) * 1939-01-31
BE559886A (en) * 1956-08-08
CN114686868B (en) * 2022-03-31 2024-05-24 东莞理工学院 Chromium-free and phosphorus-free conversion liquid and preparation method and application thereof

Also Published As

Publication number Publication date
CH209863A (en) 1940-05-15
BE430129A (en) 1938-10-31
GB515648A (en) 1939-12-11
FR841524A (en) 1939-05-22
DE671978C (en) 1939-02-17

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