Classifications

• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D1/00—Electroforming
  • C25D1/20—Separation of the formed objects from the electrodes with no destruction of said electrodes
  • C25D1/22—Separating compounds

Definitions

• This invention relates to the manufacture of metal articles by a method of the kind involving electro-depositioin of metal on to an electrode and subsequent separation of the deposited metal from said electrode.
• An example of the use of this method is the manufacture of matrices employed for pressing phonograph records.
• metal is electrodeposited to a suitable thickness on to a master matrix forming said electrode and this deposited metal, which forms the pressing matrix, is then separated from the master matrix.
• An object of the invention is toprovide an improved method of the kind referred to such that the separation of the deposited metal from said electrode can be effected more easily than hitherto.
• a further object of the invention is to provide an improved method of making a pressing matrix for use in making phonograph records.
• a further object is to provide an improved method of making a phonograph record.
• a method of manufacturing a metal article including the steps of coating an electrode for a period of at least five seconds with an aqueous solution of albumen in proportions equivalent to at least 0.5 grammes per litre, said solution including borax and an alkylated aromatic sulphonate, rinsing said electrode with water to remove said solution and to leave an adsorbedfilm of albumen on said electrode, electro-depositing metal through said film on to said electrode to form said article, and then separating said article from said electrode.
• the master matrix is thoroughly cleaned, and is then immersed in a freshly prepared medium comprising a hydrophilic colloid which is not an electrolyte, a stabilising agent, for example borax or sodium citrate, and a wetting agent.
• a stabilising agent for example borax or sodium citrate
• a suitable medium consists for example of 2 gm. of egg albumen, 2 gm. of borax which serves as a stabilising agent, 1 gm. of the wettin agent konwn as Perminal W (an alkylated aromatic sulphonate), and 1 litre of water.
• the master matrix After immersion in said medium the master matrix is rinsed in running water leavin an adsorbed film of said colloid on the surface thereof, and metal is then electro-deposited on to it.
• Said metal may be nickel, silver gold or copper where the master matrix is made from nickel. If the master matrix is made from copper, the deposited metal may be nickel or copper.
• the periphery of the master matrix and deposit is trimmed by turning, and the master matrix is separated from the pressing matrix constituted by the deposited metal. For this purpose a knife is inserted between the two matrices at the edges thereof to loosen them, whereupon the matrices can be easily separated by hand.
• the master matrix comprises two different metals, for example a nickel matrix which is of smaller diameter than required, due for example to repeated trimming of the edge as above mentioned and around which a copper rin has been soldered to provide a master matrix of the required diameter.
• the film may be applied by electrophoresis instead of by the method described above.
• a method of manufacturing a metal article said method includin the steps of coating an electrode for a period of at least 5 seconds with an aqueous solution of albumen in proportions equivalent to at least 0.5 gramme per litre, said solution including, borax and an alkylated aromatic sulphonate, rinsing said electrode with water to remove said solution and to leave an adsorbed film of albumen on said electrode, electrodepositing metal through said film on to said electrode to form said article, and then separating said article from said electrode.
• a method of making a metal article including the steps of coating an electrode for a period of at least 5 seconds with an aqueous solution of egg albumen, borax and an alkylated aromatic sulphonate in proportions equivalentto twogrammes of egg albumen, two grammes of borax and one gramme of alkylated aromatic sulphonate in one litre of water, rinsing said electrode to remove said solution and to leave an adsorbed film of egg albumen on said electrode, electrodepositing metal through said film on to said electrode to form said article, and then separating said article from said electrode.
• a method of making a pressing matrix for phonograph records including the steps of coating a master matrix for a period of at least 5 seconds with an aqueous solution of albumen in proportions equivalent to at least 0.5 gramme per litre, said solution including borax and an alkylated aromatic sulphonate, rinsing said electrode with water to remove said solution and to leave an adsorbed film of albumen on said master matrix, electrodep'ositin metal through said film on to said master matrix to form said pressing matrix, and then separating said press ing matrix from said master matrix.
• a method of making a pressin matrix for phonograph records including the steps of coating a master matrix for a period of at least 5 seconds with an aqueous solution of egg albumen, borax and an alkylated aromatic sulphonate, in proportions equivalent to two grammes of egg albumen, two grammes of borax and one gramme of alkylated aromatic sulphonate in one litre of water, rinsin said electrode to remove said solution and to leave an adsorbed lm of eg albumen on said master matrix, electrodepositing metal through said film on to said master matrix to form said pressing matrix, and then separatin said pressing matrix from said master matrix.
• a method of making a phonograph record the steps of coating a master matrix for a period of at least 5 seconds with an aqueoussolution of egg albumen, borax and an alkylated aromatic sulphonate in proportions equivalent to two grammes of egg albumen, two grammes of borax and one gramme of alkylated aromatic sulphonate in one litre of Water, rinsin said master matrix to remove said solution and to leave an adsorbed film of egg albumen on said master matrix, electrodepositing metal through said film on to said master matrix to form a pressing matrix, and then separating said pressin matrix from said master matrix.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Printing Plates And Materials Therefor (AREA)
• Electrolytic Production Of Metals (AREA)
• Electroplating Methods And Accessories (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=10269428

Family Applications (1)

Country Status (5)

Citations (10)

• 1948
  • 1948-09-24 GB GB24977/48A patent/GB651611A/en not_active Expired
• 1949
  • 1949-09-20 CH CH280490D patent/CH280490A/de unknown
  • 1949-09-20 US US116863A patent/US2689214A/en not_active Expired - Lifetime
  • 1949-09-20 FR FR995852D patent/FR995852A/fr not_active Expired
  • 1949-09-23 DE DEP55722A patent/DE810221C/de not_active Expired

Patent Citations (10)

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