US2549137A - Method for removal of oxides of copper from surfaces of alloys of copper and silver - Google Patents

Method for removal of oxides of copper from surfaces of alloys of copper and silver Download PDF

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Publication number
US2549137A
US2549137A US733727A US73372747A US2549137A US 2549137 A US2549137 A US 2549137A US 733727 A US733727 A US 733727A US 73372747 A US73372747 A US 73372747A US 2549137 A US2549137 A US 2549137A
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Prior art keywords
copper
silver
oxides
removal
alloys
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US733727A
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Archy F Slover
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KELITE PRODUCTS Inc
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KELITE PRODUCTS Inc
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Priority to US733727A priority Critical patent/US2549137A/en
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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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/10—Other heavy metals
    • C23G1/103—Other heavy metals copper or alloys of copper

Definitions

  • This invention relates to a method of treating silver alloyed with copper for the purpose of removing copper oxides from the surface thereof.
  • Silver is alloyed with copper for the purpose of hardening silver.
  • sterling silver consists of an alloy of 92 silver and of 7 A;% copper.
  • it is annealed by heating to about 1400 F., followed by quenching in cold water. This annealing process results in the formation of cuprous and cupric oxides on the surface of the metal.
  • acids such as sulphuric and nitric acid to remove these copper oxide coatings.
  • the treatment is conducted hot, preferably boiling'the solution while in contact with the metal.
  • a suitable treating time for treating, for example, sterling silver, is anannealing process of from three to ten minutes.
  • a process of treating alloys of silver and copper for the removal of copper oxides which process consists in treating the alloy with a hot solution of an acid reacting aluminum salt of a strong inorganic acid.
  • a process of treating silver alloyed with copper for removal of copper oxides from the surface thereof which process consists in treating the alloy with a hot solution of an acid-reacting aluminum salt of a strong inorganic acid essentially consisting of aluminum sulphate.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Description

Patented Apr. 17, 1951 METHOD FOR REMOVAL OF OXIDES OF COPPER FROM SURFACES OF ALLOYS OF COPPER AND SILVER Archy F. Slover, Los Angeles, Calif., assignor to Kelite Products, Inc., Los Angeles, Calif., a corporation of California N Drawing. Application March 10, 1947, Serial No. 733,727
This invention relates to a method of treating silver alloyed with copper for the purpose of removing copper oxides from the surface thereof.
Silver is alloyed with copper for the purpose of hardening silver. Thus, for example, sterling silver consists of an alloy of 92 silver and of 7 A;% copper. For hardening sterling silver, it is annealed by heating to about 1400 F., followed by quenching in cold water. This annealing process results in the formation of cuprous and cupric oxides on the surface of the metal. Previous to the present invention, it has been necessary to treat the metal with acids, such as sulphuric and nitric acid to remove these copper oxide coatings. These treatments with sulphuric and nitric acid to remove these copper oxide coatings result in a considerable loss in silver.
It is the object of the present invention to provide a process by means of which silver alloys with copper may be treated for the removal from the surface thereof of copper oxides without the treating solution dissolving any of the silver of the oxides from silver alloys, without dissolving substantially any of the silver.
While any of the acid solutions of aluminum salts which are soluble in water may, when 2 Claims. (Cl. 134-41) heated, operate satisfactorily, I prefer to employ solutions of aluminum sulphate. The amount of aluminum sulphate in solution is not critical and a suitable value is three ounces of aluminum sulphate per gallon of water.
The treatment is conducted hot, preferably boiling'the solution while in contact with the metal. A suitable treating time for treating, for example, sterling silver, is anannealing process of from three to ten minutes.
This invention is of the scope set forth in the appended claims.
I claim:
1. A process of treating alloys of silver and copper for the removal of copper oxides, which process consists in treating the alloy with a hot solution of an acid reacting aluminum salt of a strong inorganic acid.
2. A process of treating silver alloyed with copper for removal of copper oxides from the surface thereof, which process consists in treating the alloy with a hot solution of an acid-reacting aluminum salt of a strong inorganic acid essentially consisting of aluminum sulphate.
ARCHY F. SLOVER.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 542,382 Toobe July 9, 1895 1,278,744 Poetschke m Sept. 10, 1918

Claims (1)

1. A PROCESS OF TREATING ALLOYS OF SILVER AND COPPER FOR THE REMOVAL OF COPPER OXIDES, WHICH PROCESS CONSISTS IN TREATING THE ALLOY WITH A HOT SOLUTION OF AN ACID REACTING ALUMINUM SALT OF A STRONG INORGANIC ACID.
US733727A 1947-03-10 1947-03-10 Method for removal of oxides of copper from surfaces of alloys of copper and silver Expired - Lifetime US2549137A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US542382A (en) * 1895-07-09 Art of preparing metal plates for lithographic printing
US1278744A (en) * 1918-02-07 1918-09-10 L D Caulk Company Alloy and method of purifying same.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US542382A (en) * 1895-07-09 Art of preparing metal plates for lithographic printing
US1278744A (en) * 1918-02-07 1918-09-10 L D Caulk Company Alloy and method of purifying same.

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