DE494262C - Process for the production of oxidic coatings on light metals in oxidizing solutions - Google Patents

Process for the production of oxidic coatings on light metals in oxidizing solutions

Info

Publication number
DE494262C
DE494262C DEJ31817D DEJ0031817D DE494262C DE 494262 C DE494262 C DE 494262C DE J31817 D DEJ31817 D DE J31817D DE J0031817 D DEJ0031817 D DE J0031817D DE 494262 C DE494262 C DE 494262C
Authority
DE
Germany
Prior art keywords
production
light metals
oxidizing solutions
solutions
oxidizing
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
DEJ31817D
Other languages
German (de)
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.)
Dr Otto Sprenger Patentverwertung Jirotka Mbh
Original Assignee
Dr Otto Sprenger Patentverwertung Jirotka Mbh
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 Dr Otto Sprenger Patentverwertung Jirotka Mbh filed Critical Dr Otto Sprenger Patentverwertung Jirotka Mbh
Priority to DEJ31817D priority Critical patent/DE494262C/en
Application granted granted Critical
Publication of DE494262C publication Critical patent/DE494262C/en
Expired legal-status Critical Current

Links

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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/68—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8

Landscapes

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

Description

Verfahren zur Herstellung von oxydischen Überzügen auf Leichtmetallen in oxydierenden Lösungen Es ist bekannt, auf Gegenständen aus Magnesium oderMagnesiumlegierungen durch Behandlung mit Wasserdämpfen bei Temperaturen über ioo' möglichst in einem Autoklaven unter Druck einen Überzug aus Magnesiumhydroxyd herzustellen. Ein gefärbter oxydischer Überzug auf Magnesitim kann auch in der Weise erzeugt werden ', daß man Schwermetallsalzlösungen in Gegenwart von Chromsäure und nötigenfalls auch noch anderen Säuren auf Magnesium und -.Nlagn#esi#uinlugierungen einwirken läßt.Process for the production of oxidic coatings on light metals in oxidizing solutions It is known to produce a coating of magnesium hydroxide on objects made of magnesium or magnesium alloys by treatment with water vapors at temperatures above 100 ', if possible in an autoclave under pressure. A colored oxidic coating on Magnesitim can also be produced in such a way 'that one heavy metal salt solutions in the presence of chromic acid and, if necessary also other acids, magnesium and -.Nlagn # ESI # uinlugierungen can act.

z# Endlich hat man auch ganz allgemein in Vorschlag gebracht, blanke Dralitspulen zu oxydieren, um sie elektrisch zu isolieren.z # Finally a proposal has been made in general, bare To oxidize wire coils in order to isolate them electrically.

Nach vorliegender Erfindung werden Leichtmetalle, insbesondere Aluminium und Magnesium sowie ihre Legierungen, in wäßrigen neutralen Lösungen mit gefärbten oxydischen Überzügen dadurch versehen, daß sij mit einem wasserlöslichen Chromat in Gegenwart eines zweiten oxydierenden Stoffes in neutralen Bädern behandelt werden.According to the present invention, light metals, in particular aluminum and magnesium and their alloys, in aqueous neutral solutions with colored Oxydic coatings provided in that sij with a water-soluble chromate treated in the presence of a second oxidizing substance in neutral baths.

Als solch oxydierender neutraler Zusatz kann besonders Wasserstoffsuperoxyd Verwendting finden.Hydrogen peroxide in particular can be used as such an oxidizing neutral additive Find usage.

SO konnte auf Aluminium durch Behandlung init einem Bade, das 2"1, Natriumbichromat und 1,2 `1, Wasserstoffsuperoxyd enthielt, ein goldbratiner Niederschlag schon in der Kälte erhalten werden. SO a golden precipitate could be obtained on aluminum by treatment with a bath which contained 2 "1, sodium bichromate and 1.2" 1, hydrogen peroxide, even in the cold.

Gibt inan zu diesem Bade 0-,2 ".11, Ferrichlorid, so nimmt der Überzug eine braune, lederartige Färbung an. Besonders wertvoll sind diese neutralen Bäder für die Behandlung von Magnesium und seinen Legierungen, weil eine stärkere chemische Einwirkung auf das Magnesium, wie sie bei Behandlung in sauren Bädern eintritt, vermieden wird.If you add 0.2 ".11 ferric chloride to this bath, the coating decreases a brown, leathery color. These neutral baths are particularly valuable for the treatment of magnesium and its alloys because a stronger chemical Action on magnesium, as it occurs during treatment in acidic baths, is avoided.

Die Chromate können ganz oder zum Teil durch Permanganate ersetzt werden. Verwendet man ein Gemisch von Chromaten und Permanganaten, z. B. eine 5 "/,ige Lösung beider Komponenten, so erübrigt sich ein besonderer Zusatz von Wasserstoffsuperoxyd, off enbar, weil dieses sich aus den beiden Salzen unter den Reaktionsverhältnissen bei der überziehung bildet.The chromates can be replaced in whole or in part by permanganates. If a mixture of chromates and permanganates is used, e.g. B. a 5 "/, ige solution of both components, then a special addition of hydrogen peroxide is unnecessary, evidently because this forms from the two salts under the reaction conditions during the coating.

Claims (2)

PATENTANSPRÜCHE.-i. Verfahren zur Herstellung von oxydischen Überzügen auf Leichtmetallen in oxydierenden Lösungen, gekennzeichnet durch die Verwendung neutraler Lösungen mit Wasserstoffsuperoxydzusatz neben einem Gehalt an wasserlöslichen Salzen der Chrornsäure. PATENT CLAIMS.-i. Process for the production of oxide coatings on light metals in oxidizing solutions, characterized by the use neutral solutions with the addition of hydrogen peroxide in addition to a content of water-soluble ones Salts of chromic acid. 2. Verfahren nach Anspruch i, dadu ' rch gekennzeichnet, daß die Chromate ganz oder zum Teil durch Permanganate ersetzt werden, in welch letzterem Falle ,der besondere Zusatz von Wasserstoffstiperoxyd unterbleiben kann.2. The method of claim i, dadu 'rch in that the chromate be wholly or partly replaced by permanganates may be used in which latter case, the special additional omitted from Wasserstoffstiperoxyd.
DEJ31817D 1927-07-31 1927-07-31 Process for the production of oxidic coatings on light metals in oxidizing solutions Expired DE494262C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEJ31817D DE494262C (en) 1927-07-31 1927-07-31 Process for the production of oxidic coatings on light metals in oxidizing solutions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEJ31817D DE494262C (en) 1927-07-31 1927-07-31 Process for the production of oxidic coatings on light metals in oxidizing solutions

Publications (1)

Publication Number Publication Date
DE494262C true DE494262C (en) 1930-03-20

Family

ID=7204287

Family Applications (1)

Application Number Title Priority Date Filing Date
DEJ31817D Expired DE494262C (en) 1927-07-31 1927-07-31 Process for the production of oxidic coatings on light metals in oxidizing solutions

Country Status (1)

Country Link
DE (1) DE494262C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE739605C (en) * 1939-12-07 1943-09-30 Albert Butziger Process for converting the surface of magnesium or magnesium alloys into an electrically non-conductive, corrosion-resistant layer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE739605C (en) * 1939-12-07 1943-09-30 Albert Butziger Process for converting the surface of magnesium or magnesium alloys into an electrically non-conductive, corrosion-resistant layer

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