US2509273A - Protection of magnesium and magnesium base alloys against corrosion - Google Patents

Protection of magnesium and magnesium base alloys against corrosion Download PDF

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Publication number
US2509273A
US2509273A US18716A US1871648A US2509273A US 2509273 A US2509273 A US 2509273A US 18716 A US18716 A US 18716A US 1871648 A US1871648 A US 1871648A US 2509273 A US2509273 A US 2509273A
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magnesium
water
against corrosion
base alloys
grams
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US18716A
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Simon E Mayer
William F Higgins
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Magnesium Elektron Ltd
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Magnesium Elektron Ltd
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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
    • C23C22/06—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
    • C23C22/24—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 hexavalent chromium compounds

Definitions

  • This invention relates to the protection of magnesium and magnesium base alloys against corrosion by immersion of the metal in a solution which reacts with the metal and produces a protective film on it.
  • the main object of the present invention is to provide a process which whilst suitable for the treatment of various magnesium base alloys, is well adapted to the treatment of magnesium alloys containing zirconium.
  • the metal is treated in an aqueous solution containing chromic acid ions, magnesium sulphate, and manganous sulphate, the solution having a pH value between 3 and 6 (preferably 4 to 6.0) and being used at room temperature.
  • the chromic acid ions are conveniently provided by potassium and/or sodium dichromate which may be used in the proportions of 50 to 150 grams (e. g. 100 grams) to one litre of water.
  • the magnesium sulphate may be used in the proportions of 30 to 70 (e. g. 50 grams) of to one litre of water.
  • the manganese sulphate may be used in the proportions of 30 to 70 (e. g.
  • the solution may consist of Water litre 1 Sodium dichromate grams 100 MgSO4.7H2O do 50 Mnso4.4HzO "do--- 50 A treatment of about two hours at room temperature produces an even black film on magnesium base alloys containing zirconium, with or without zinc, cadmium, or beryllium, and the solution also produces an effective film on magnesium, and on magnesium containing various proportions of aluminum with or without other alloying constituents.
  • the process can be carried out at room temperatures or with the solution maintained hot, e. g. boiling or at any temperature below boiling point.
  • the solution can be used either cold or hot according to th requirements of the user. If the solution is used at the boiling point the period of immersion may be reduced to about 10 minutes; the use of the solution hot results in satisfactory film formation, whilst retaining reasonably long life of the solution.
  • a method of treating magnesium base a1- loys containing zirconium to afiord protection against corrosion, wherein the metal is reacted upon and a surface film is formed which comprises immersing said metal in an aqueous solution which consists essentially of water, chromic acid ions, magnesium sulphate, and manganous sulphate, the solution having a pH value between 3 and 6, the manganese sulphate being present in a proportion of between 30 and grams of MnSO4A H2O to one litre of water, and the magnesium sulphate being present in quantity from 30 to 70 grams of MgSO4.7I-I2O- per litre of Water.
  • a method of treating magnesium base alloys containing zirconium to afford protection against corrosion, wherein the metal is reacted upon and a surface film is formed which comprises immersing said metal in an aqueous solution which consists essentially of water as solvent and the following solutes: viz., at least one substance selected from the group consisting of the dichromates of potassium and sodium in the proportions of 50 to grams to one litre of water, and magnesium sulphate and manganous sulphate, each in the proportion of 30 to 70 grams of MgSO4.7I-I2O and MnSOulHzO respectively per litre of water, the solution having a pH value between 3 and 6.

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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)
  • Electroplating Methods And Accessories (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Description

Patented May 30, 1950 UNITED STATES PATENT OFFICE PROTECTION OF MAGNESIUM AND MAGNE- SEUM BASE ALLOYS AGAINST CORROSION No Drawing. Application April 2, 1948, Serial No. 18,716. In Great Britain April 3, 1947 2 Claims. 1
This invention relates to the protection of magnesium and magnesium base alloys against corrosion by immersion of the metal in a solution which reacts with the metal and produces a protective film on it.
We have encountered difficulties in applying hitherto known processes to the treatment of magnesium alloys which contain a small percentage of zirconium in accordance with British Patent No. 511,137.
The main object of the present invention is to provide a process which whilst suitable for the treatment of various magnesium base alloys, is well adapted to the treatment of magnesium alloys containing zirconium.
According to the present invention the metal is treated in an aqueous solution containing chromic acid ions, magnesium sulphate, and manganous sulphate, the solution having a pH value between 3 and 6 (preferably 4 to 6.0) and being used at room temperature. The chromic acid ions are conveniently provided by potassium and/or sodium dichromate which may be used in the proportions of 50 to 150 grams (e. g. 100 grams) to one litre of water.
The magnesium sulphate may be used in the proportions of 30 to 70 (e. g. 50 grams) of to one litre of water. The manganese sulphate may be used in the proportions of 30 to 70 (e. g.
50 grams) of MnSOeAI-IzO to one litre of water.
Thus the solution may consist of Water litre 1 Sodium dichromate grams 100 MgSO4.7H2O do 50 Mnso4.4HzO "do--- 50 A treatment of about two hours at room temperature produces an even black film on magnesium base alloys containing zirconium, with or without zinc, cadmium, or beryllium, and the solution also produces an effective film on magnesium, and on magnesium containing various proportions of aluminum with or without other alloying constituents.
The process can be carried out at room temperatures or with the solution maintained hot, e. g. boiling or at any temperature below boiling point. In other words the solution can be used either cold or hot according to th requirements of the user. If the solution is used at the boiling point the period of immersion may be reduced to about 10 minutes; the use of the solution hot results in satisfactory film formation, whilst retaining reasonably long life of the solution.
We claim:
1. A method of treating magnesium base a1- loys containing zirconium to afiord protection against corrosion, wherein the metal is reacted upon and a surface film is formed, which comprises immersing said metal in an aqueous solution which consists essentially of water, chromic acid ions, magnesium sulphate, and manganous sulphate, the solution having a pH value between 3 and 6, the manganese sulphate being present in a proportion of between 30 and grams of MnSO4A H2O to one litre of water, and the magnesium sulphate being present in quantity from 30 to 70 grams of MgSO4.7I-I2O- per litre of Water.
2. A method of treating magnesium base alloys containing zirconium to afford protection against corrosion, wherein the metal is reacted upon and a surface film is formed, which comprises immersing said metal in an aqueous solution which consists essentially of water as solvent and the following solutes: viz., at least one substance selected from the group consisting of the dichromates of potassium and sodium in the proportions of 50 to grams to one litre of water, and magnesium sulphate and manganous sulphate, each in the proportion of 30 to 70 grams of MgSO4.7I-I2O and MnSOulHzO respectively per litre of water, the solution having a pH value between 3 and 6.
SIMON E. MAYER. W. F. HIGGINS.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,747,776 Jirotka Feb. 18, 1930 2,224,528 Sutton et al Dec. 10, 1940 2,288,552 Siebel et a1 June 30, 1942 2.352.076 Bushrod June 20, 1944

Claims (1)

  1. 2. A METHOD OF TREATING MAGNESIUM BASE ALLOYS CONTAINING ZIRCONIUM TO AFFORD PROTECTION AGAINST CORROSION, WHEREIN THE METAL IS REACTED UPON AND A SURFACE FILM IS FORMED, WHICH COMPRISES IMMERSING SAID METAL IN AN AQUEOUS SOLUTION WHICH CONSISTS ESSENTIALLY OF WATER AS SOLVENT AND THE FOLLOWING SOLUTES: VIZT, AT LEAST ONE SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF THE DICHROMATES OF POTASSIUM AND SODIUM IN THE PROPORTIONS OF 50 TO 150 GRAMS TO ONE LITRE OF WATER, AND MAGNESIUM SULPHATE AND MANGANOUS SULPHATE, EACH IN THE PORTION OF 30 TO 70 GRAMS OF MGSO4.7HO AND MNSO4.4H2OP RESPECTIVELY PER LITRE OF WATER, THE SOLUTION HAVING A PH VALUE BETWEEN 3 AND 6.
US18716A 1947-04-03 1948-04-02 Protection of magnesium and magnesium base alloys against corrosion Expired - Lifetime US2509273A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2509273X 1947-04-03
GB9101/47A GB631686A (en) 1947-04-03 1947-04-03 Improvements in or relating to the protection of magnesium and magnesium base alloysagainst corrosion

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US2509273A true US2509273A (en) 1950-05-30

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FR (1) FR964050A (en)
GB (1) GB631686A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1747776A (en) * 1929-04-19 1930-02-18 Firm Dr Otto Sprenger Patentve Production of dark oxidic coatings on magnesium and magnesium alloys
US2224528A (en) * 1937-12-23 1940-12-10 Sutton Hubert Protection of magnesium and magnesium alloys
US2288552A (en) * 1939-02-23 1942-06-30 Siebel Gustav Method of surface treating objects of cast magnesium base alloys
US2352076A (en) * 1942-04-02 1944-06-20 Magnesium Elektron Ltd Process for the protection of magnesium and magnesium base alloys against corrosion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1747776A (en) * 1929-04-19 1930-02-18 Firm Dr Otto Sprenger Patentve Production of dark oxidic coatings on magnesium and magnesium alloys
US2224528A (en) * 1937-12-23 1940-12-10 Sutton Hubert Protection of magnesium and magnesium alloys
US2288552A (en) * 1939-02-23 1942-06-30 Siebel Gustav Method of surface treating objects of cast magnesium base alloys
US2352076A (en) * 1942-04-02 1944-06-20 Magnesium Elektron Ltd Process for the protection of magnesium and magnesium base alloys against corrosion

Also Published As

Publication number Publication date
GB631686A (en) 1949-11-08
FR964050A (en) 1950-08-01

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