US1747776A - Production of dark oxidic coatings on magnesium and magnesium alloys - Google Patents

Production of dark oxidic coatings on magnesium and magnesium alloys Download PDF

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Publication number
US1747776A
US1747776A US366538A US36653829A US1747776A US 1747776 A US1747776 A US 1747776A US 366538 A US366538 A US 366538A US 36653829 A US36653829 A US 36653829A US 1747776 A US1747776 A US 1747776A
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Prior art keywords
magnesium
dark
coatings
production
alloys
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US366538A
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Jirotka Bohumil
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FIRM DR OTTO SPRENGER PATENTVE
Firm Dr Otto Sprenger Patentverwertung Jirotka M B H
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FIRM DR OTTO SPRENGER PATENTVE
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    • 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

Definitions

  • My invention relates in improvements in the production of dark oxidic coatings on magnesium and magnesium alloys.
  • salts of some heavy metals more especially tin and chromium
  • my present invention it is possible to obtain firmly adhering deep dark brown to black coatings on magnesium and its allo s in completely neutral baths, by introducmg them into solutions which contain salts of the divalent manganese and in addition water-soluble chromates.
  • the coatings are so strong and adherent, that they can even be swabbed.

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  • 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

are
BQHUMIL J'IROTKA, 0E BERLIN, GERMANY, ASSIGNOR TO THE FIRM DR. OTTO SPEENG' ER PATENTVERWERTUNG JIROTKA M. B. H., 014 VADUZ, LIECHTENSTEIN PRQDUCTION OFDARK OXIDIC COATINGS 0N MAGNESIUM AND MAGNESIUM ALLOYS No Drawing. Application filed may 27, i929, Serial No. 366,538, and in Germany April 19, 1929.
My invention relates in improvements in the production of dark oxidic coatings on magnesium and magnesium alloys.
It is known to obtain different coloured coatings on magnesium and magnesium alloys in strongly acid baths.
A method has also been proposed for obtaining light to dark grey coatings by treatment of magnesium and magnesium alloys with solutions of salts of some heavy metals, more especially tin and chromium, if necessary in the presence of reaction-accelerating fiddliltions, without an acid being added to the According to my present invention it is possible to obtain firmly adhering deep dark brown to black coatings on magnesium and its allo s in completely neutral baths, by introducmg them into solutions which contain salts of the divalent manganese and in addition water-soluble chromates. The coatings are so strong and adherent, that they can even be swabbed.
In order for instance to obtain a deep black coating of this kind, I immerse articles of magnesium or magnesium alloys which are superior in hardness to magnesium, in a bath containing 100 grms. manganese sulphate ant" 100 grms., sodium bichromate to 1 litre oi: water and heat the bath for a short time, in which case the articles becomecovered with "a black coating, containing manganese dioxide. Instead of manganese sul hate I use other mangano-salts, instead o sodium-bichromate other chromates as for instance potassium chromate.
I claim: v
1. The herein described process of producing dark oxidic coatings on magnesium and magnesium alloys, which consists in treating the said metals in neutral baths, whicn contain water-soluble salts of manganese and water-soluble salts of the chromic acid. 2. The herein described process of producing dark oxidic coatings on magnesium and BOHUMIL J IROTKA.
US366538A 1929-04-19 1929-05-27 Production of dark oxidic coatings on magnesium and magnesium alloys Expired - Lifetime US1747776A (en)

Applications Claiming Priority (1)

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DE1747776X 1929-04-19

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US1747776A true US1747776A (en) 1930-02-18

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2446617A (en) * 1944-03-11 1948-08-10 Asea Ab Method of producing electrically semiconducting coatings
US2509273A (en) * 1947-04-03 1950-05-30 Magnesium Elektron Ltd Protection of magnesium and magnesium base alloys against corrosion
US3301719A (en) * 1962-10-15 1967-01-31 Boeing Co Chemical conversion coating for magnesium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2446617A (en) * 1944-03-11 1948-08-10 Asea Ab Method of producing electrically semiconducting coatings
US2509273A (en) * 1947-04-03 1950-05-30 Magnesium Elektron Ltd Protection of magnesium and magnesium base alloys against corrosion
US3301719A (en) * 1962-10-15 1967-01-31 Boeing Co Chemical conversion coating for magnesium

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