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DE717183C - Process for the production of black-colored, corrosion-resistant protective layers on the surface of objects made of aluminum or aluminum alloys - Google Patents

Process for the production of black-colored, corrosion-resistant protective layers on the surface of objects made of aluminum or aluminum alloys

Info

Publication number
DE717183C
DE717183C DEB190401D DEB0190401D DE717183C DE 717183 C DE717183 C DE 717183C DE B190401 D DEB190401 D DE B190401D DE B0190401 D DEB0190401 D DE B0190401D DE 717183 C DE717183 C DE 717183C
Authority
DE
Germany
Prior art keywords
aluminum
black
corrosion
hydrochloric acid
colored
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
DEB190401D
Other languages
German (de)
Inventor
Dr-Ing Otto Jauch
Heinrich Schuetz
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DEB190401D priority Critical patent/DE717183C/en
Application granted granted Critical
Publication of DE717183C publication Critical patent/DE717183C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
    • H01R39/24—Laminated contacts; Wire contacts, e.g. metallic brush, carbon fibres
    • 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
    • C23C22/06—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 acidic solutions with pH less than 6
    • C23C22/34—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 acidic solutions with pH less than 6 containing fluorides or complex fluorides
    • 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
    • C23C22/06—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 acidic solutions with pH less than 6
    • C23C22/48—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 acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/56—Treatment of aluminium or alloys based thereon

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)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Description

Verfahren zur Herstellung von schwarz gefärbten korrosionsbeständigen Schutzschichten auf der Oberfläche von Gegenständen aus Aluminium oder Aluminiumlegierungen Das Patent 712 877 betrifft ein Verfahren zur Herstellung vorn schwarz gefärbten korrosionsbeständigen und/ oder elektrisch isolierenden Schutzschichten auf Aluminium oder Aluminiumlegierungen. Gemäß dem Hauptpatent 712 877 werden die- Werkstücke in einer wässerigen Alunziriiumchloridlösung bei erhöhter Temperatur vorgebeizt, dann in einer mit Schwefelsäure angesäuerten und erwärmter.lhaliumpermanganatlösung schwarz gefärbt und zum S.chluß in einer alkalischen Chromatlösung bei erhöhter Temperatur nachbehandelt. Die auf diese Weise erhaltenen überzüge sind verformungsfest, insbesondere biegefest. Es wurde gefunden, daß man vor allem glatter.: und dazu auch noch korrosionsfester Schutzschichten auf Aluminium oder Aluminiumlegierungen erhält, wenn man an Stelle des Vorbeizbgdes gemäß dem Hauptpatent eine verdünnte Salzsäure reit gewissen Zusätzen anwendet und/odier c?i:: Schwefehcäure der S.chwarzfärbelösung g-ennä % dem Hauptpatent durch fGvselaußsäure ersetzt.Process for the production of black colored corrosion-resistant protective layers on the surface of objects made of aluminum or aluminum alloys The patent 712 877 relates to a process for the production of black colored corrosion-resistant and / or electrically insulating protective layers on aluminum or aluminum alloys. According to the main patent 712 877, the workpieces are pre-pickled in an aqueous aluminum chloride solution at elevated temperature, then colored black in an acidified and heated aluminum permanganate solution and finally treated in an alkaline chromate solution at elevated temperature. The coatings obtained in this way are resistant to deformation, in particular resistant to bending. It has been found that above all smoother: and also corrosion-resistant protective layers on aluminum or aluminum alloys are obtained if, instead of the pickling agent according to the main patent, a dilute hydrochloric acid with certain additives is used and / or c? I :: sulfuric acid from S. .black staining solution g-ennä% of the main patent replaced by fGvselaußäure.

Es äst an skla bekannt, daß heiße, verdünnte Salzsäure zu aggressiv, auf Aluminium oder seine Legierungen .einwirkt und eitle starke Aufrauhung auf deren Oberlohe hervorruft. Eine stark aufgerauhte Oberfläche von Metallwerkstücken aus Aluminium oder Altunihitunlügierungen ist bekanntlich wigünstig in bezug auf die Korrosionsbeständigkeit der darauf erzeugten Korrosionsschutzschichten, Erfindungsgemäß wird der heißen. verdünnten#' Salzsäure ein Zusatz gegeben, der die zu, 1 starke Aufrauhung des Metallwerkstückes, die meistens auch mehr oder weniger unregelmäßig, also örtlich stark verschieden ist, verhindert. Dies kann durch einen an sich bekannten Sparbeizzusatz erreicht werden. Zum Beizen von Werkstücken aus Aluminium oder Alumililumlcgicrungcii mit verdünnter, heißer Salzsäure hat sich als besonders geeignet ein solcher aus Sulfoharnstoff erwiesen, der zweckmäßig in Mengen von etwa 30/0 de' ioo/oigen heißen Sälzsäure zugesetzt wird.It is known to skla that hot, dilute hydrochloric acid is too aggressive, acts on aluminum or its alloys and vain strong roughening on them Oberlohe causes. A heavily roughened surface made of metal workpieces Aluminum or Altunihitunlügierungen is known to be unfavorable with regard to the corrosion resistance of the anti-corrosion layers produced thereon, According to the invention, the hot one. diluted # 'hydrochloric acid given an additive that the too, 1 strong roughening of the metal workpiece, which is usually more or less is irregular, that is, it differs greatly from one place to another. This can be done by a known Sparbeizzusatz can be achieved. For pickling workpieces Aluminum or Alumililumlcgicrungcii with dilute, hot hydrochloric acid has proved to be particularly suitable one made of sulfourea, which is expedient in Amounts of about 30/0 of the 100% hot hydrochloric acid are added.

Es wurde weiter gefunden, daß man an Stelle des Sparbcizzusatzes auch ein Chromat oder 13ichromat anwenden kann. Allerdings müsseil hiervon größere Mengen der verdünnten Salzsäure zugesetzt werden, beispielsweise i oo g Natriumbichromat auf i 1 1 o- bis i 5 %ige Salzsäure. Ein solches # Vor beizbad hat jedoch den Vorteil, daß es auch schon bei mittleren Temperaturen genügend stark die Oberfläche der Werkstücke aus Aluminium oder Aluminiumlegierungen aktiviert, was in manchen Fällen vorteilhaft ist.It was also found that instead of the Sparbcizzusatzes also a chromate or 13 dichromate can apply. However, larger quantities of this must be used added to the dilute hydrochloric acid, for example 100 g of sodium dichromate on i 1 1 o- to i 5% hydrochloric acid. Such a pre-pickling bath, however, has the advantage that the surface of the workpieces is sufficiently strong even at medium temperatures activated from aluminum or aluminum alloys, which is advantageous in some cases is.

Dic Tauchzeit- ist bei den Vorbeizbädern gemäß der vorliegenden Erfindung wesentlich verkürzt gegenüber dem Vorbeizbad gemäß dem Hauptpatent. Darüber hinaus sind aber die erfindungsgemäßen Vorbeizbäder auch noch viel ausgiebiger.The dip time is at the pickling baths according to the present invention significantly shortened compared to the pickling bath according to the main patent. Furthermore but the pickling baths according to the invention are also much more extensive.

Die erfindungsgemäße Anwendung der Kieselflußsäure in der Schwarzfärbelösung gemäß dem Hauptpatent an Stelle der Schweflsäure wirkt sich vorteilhaft dahingehend' aus, daß die Schwarzfärbung der Werkstücke aus Aluminium oder Aluminiumlegierungen, insbesondere bei kupferfreien Aluminiumlegierungen, leichter zu erreichen ist; denn solche kieselflußsäurehaltigefi Schwarzfä rbelösungen ermöglichen die Schwarzfärbung von Aluminium und seinen Legierungen bereits bei Raumtemperatur. Dabei ist es bei Verwendung dieser erfindungsbemäßen Lösungen nicht einmal unbedingt erforderlich, das Werkstück vorzubeizen. wenn es auch bei Werkstücken mit starken Guß-oder Preßhäuten zweckentsprechend ist, sie leicht vorzubeizen. Eine erfindungsgemäße Schwarzfärbclösung .hat beispielsweise fol-Irende Zusammensetzung: 2o bis 40g Kaliumpcrmangailat, i 1 Wasser, ioo ccm Kieselflußsäure (s- 1,3).The inventive use of hydrofluoric acid in the black dye solution According to the main patent, instead of sulfuric acid, this has an advantageous effect ' from the fact that the black coloration of the workpieces made of aluminum or aluminum alloys, especially with copper-free aluminum alloys, is easier to achieve; because Such silicofluoric acid-containing black coloring solutions enable black coloring of aluminum and its alloys even at room temperature. It is at Use of these solutions according to the invention is not even absolutely necessary, pre-pickling the workpiece. even if it is the case with workpieces with strong cast or pressed skins it is appropriate to pre-pickle them slightly. A black dye solution according to the invention . Has, for example, the following composition: 2o to 40g potassium permangailate, i 1 water, 100 cc of hydrofluoric acid (s-1.3).

Claims (3)

PATENTANSPRÜCHE: i. Verfahren zum Schwarzfärben von Aluminium oder Aluminiumlegierungen nach Patent 712877, dadurch gekenlizeichnet, daß als Vorbeizbad eine heiße, verdünnte Salzsäure unter Zusatz von Mitteln, welche eine zu starke Aufrauhun:g der Metalloberfläch=e verhindern, und/oder als Schwarzfärbelösung eine kieselfluPasättrehaltige Kaliumpermanganatlösung angewandt wird. PATENT CLAIMS: i. Process for blackening aluminum or aluminum alloys according to patent 712877, characterized in that a hot, dilute hydrochloric acid with the addition of agents which prevent excessive roughening of the metal surface is used as the pickling bath and / or a potassium permanganate solution containing silicic acid is used as the blackening solution . 2. Ausbildung des Verfahrens gemäß Anspruch i, dadurch gekennzeichnet, daß als Vorbeize heiße, verdünnte io- bis 2o%igc Salzsäure mit etwa 3% Sttlfoharnstoff verwandt wird. 2. Training of the method according to claim i, characterized in that hot, Dilute io- to 20% hydrochloric acid with about 3% sttlfourea is used. 3. Ausbildung des Verfahrens gemäß Anspruch i, dadurch gekennzeichnet, daß als Vorbeize ein auf 4o bis 5o° C erwärmtes Bad der Zusammensetzung 11 i o- bis i 5 0/q ige Salzsäure, 5o bis 200g Natriumbichromat verwandt wird. q.. Ausbildung des Verfahrens gemäß Anspruch i, dadurch gekennzeichnet, daß als Schwarzfärbelösung ein auf Raumtemperatur gehaltenes Bad der Zusammensetzung 11 Wasser, 2o bis 40 g Kaliumpermanganat, i oo ccm Kieselflußsäure angewandt wird.3. Formation of the method according to claim i, characterized in that a heated to 4o to 5o ° C bath of the composition 11 i o to i 5 0 / q hydrochloric acid, 5o to 200g sodium dichromate is used as a pre-pickling. q .. Formation of the process according to claim i, characterized in that a bath of the composition 1 1 water, 2o to 40 g potassium permanganate, 10o ccm silicofluoric acid kept at room temperature is used as the black coloring solution.
DEB190401D 1939-03-11 1940-04-11 Process for the production of black-colored, corrosion-resistant protective layers on the surface of objects made of aluminum or aluminum alloys Expired DE717183C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEB190401D DE717183C (en) 1939-03-11 1940-04-11 Process for the production of black-colored, corrosion-resistant protective layers on the surface of objects made of aluminum or aluminum alloys

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE230710X 1939-03-11
DE100440X 1940-04-10
DEB190401D DE717183C (en) 1939-03-11 1940-04-11 Process for the production of black-colored, corrosion-resistant protective layers on the surface of objects made of aluminum or aluminum alloys

Publications (1)

Publication Number Publication Date
DE717183C true DE717183C (en) 1942-02-10

Family

ID=25750341

Family Applications (2)

Application Number Title Priority Date Filing Date
DEB186637D Expired DE712877C (en) 1939-03-11 1939-03-12 Process for the production of black-colored, corrosion-resistant protective layers on the surface of objects made of aluminum or aluminum alloys
DEB190401D Expired DE717183C (en) 1939-03-11 1940-04-11 Process for the production of black-colored, corrosion-resistant protective layers on the surface of objects made of aluminum or aluminum alloys

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DEB186637D Expired DE712877C (en) 1939-03-11 1939-03-12 Process for the production of black-colored, corrosion-resistant protective layers on the surface of objects made of aluminum or aluminum alloys

Country Status (4)

Country Link
US (1) US2247580A (en)
CH (2) CH225861A (en)
DE (2) DE712877C (en)
FR (2) FR868389A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH245690A (en) * 1944-10-06 1946-11-30 Agma Aktiengesellschaft Process of chemical oxidation of aluminum and its alloys.
GB878673A (en) * 1957-01-30 1961-10-04 Ici Ltd Improved alkali baths for metal treatment
US3067052A (en) * 1959-09-21 1962-12-04 Interchem Corp Gold colored metallic pigments
CH584762A5 (en) * 1973-05-17 1977-02-15 Alusuisse
US5437740A (en) * 1993-04-21 1995-08-01 Sanchem, Inc. Corrosion resistant aluminum and aluminum coating
DE102006029671A1 (en) * 2006-06-28 2008-01-03 BSH Bosch und Siemens Hausgeräte GmbH Guiding device for carbon brush, has hot plate made of aluminum material by extrusion molding and cutting, where isolating layer of hot plate is manufactured by chemical oxidization of aluminum material

Also Published As

Publication number Publication date
CH225861A (en) 1943-02-28
FR51965E (en) 1943-05-27
US2247580A (en) 1941-07-01
DE712877C (en) 1941-10-27
CH230710A (en) 1944-01-31
FR868389A (en) 1941-12-29

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