US2088615A - Electrodeposition of chromium - Google Patents

Electrodeposition of chromium Download PDF

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Publication number
US2088615A
US2088615A US642025A US64202532A US2088615A US 2088615 A US2088615 A US 2088615A US 642025 A US642025 A US 642025A US 64202532 A US64202532 A US 64202532A US 2088615 A US2088615 A US 2088615A
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chromium
salt
electrodeposition
solution
chromic
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US642025A
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Schlotter Max
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/04—Electroplating: Baths therefor from solutions of chromium

Definitions

  • An object of mypresent invention is o provide a process in which chromium dissoives at the anode as a chromium salt and not as chromic acid.
  • the solution of chromium from a chromium anode as a chromium J salt, and not as chromic acid is achieved by adding to the electrolytic bath, comprising for example a chromium solution, which form special compounds with the chorimum and which do not, therefore, produce the well known ionic reactions of chromium. That is, they form compounds in which the chromium enters as a part of the complex ion and not as chromium ion or chromic acid ion.
  • Such substances that may be added are sulphites, thiocyanates or suliocyanates and the like.
  • Any suitable salt containing the desired anion for example an alkali thlocyanate such as ammonium thiocyanate, potassium or sodium 30 thiocyanate, or alkaline earth thiocyanates or thiocyanates of other metals'can be employed.
  • a process for the electrolytic deposition of chromium which comprises passing an electric current from a chromium anode to a cathode through an aqueous solution containing complex ions of chromium and thiocyanate radicals whereby chromium dimlves from said anode to form said complex ions and is deposited at said cathode.

Description

Patented Aug. 3, 1937 UNITED STATES PATENT OFFICE Y rialNmMZJZS. In
1 Claim.
It has been proposed to electroplate' or depoflt chromium from a solution of a chromic salt, but this has heretofore been imposible. If insoluble anodes are used, products are formed which de- 5 stroy the depomt of chromium. I! chromium anodes are used, the chromium dissolves as chromlc acid and not as a chromic salt, so that deposition takes place from a chromic acid so- N lution and not from a chromium salt solution.
An object of mypresent invention is o provide a process in which chromium dissoives at the anode as a chromium salt and not as chromic acid. In my present invention the solution of chromium from a chromium anode as a chromium J salt, and not as chromic acid, is achieved by adding to the electrolytic bath, comprising for example a chromium solution, which form special compounds with the chorimum and which do not, therefore, produce the well known ionic reactions of chromium. That is, they form compounds in which the chromium enters as a part of the complex ion and not as chromium ion or chromic acid ion.
Such substances that may be added are sulphites, thiocyanates or suliocyanates and the like. Any suitable salt containing the desired anion, for example an alkali thlocyanate such as ammonium thiocyanate, potassium or sodium 30 thiocyanate, or alkaline earth thiocyanates or thiocyanates of other metals'can be employed.
June 29, 19
(CI. I'M-l) 260 gr. of chromic chloride crystals 50 er. of ammonium chloride 40 gr. of ammonium thiocyanate to gr. of boric acid 1 liter oi. water Temperature of bath: 20 C. Current density: 800 to 1000 amp./m Voltage: 4.6-5.8 volt From this solution a lustrous chromium deposit is obtained. It the thiocyanate or ammonium content is increased, black, glossy, firmly adhering deposits are obtained.
What I claim is:
A process for the electrolytic deposition of chromium which comprises passing an electric current from a chromium anode to a cathode through an aqueous solution containing complex ions of chromium and thiocyanate radicals whereby chromium dimlves from said anode to form said complex ions and is deposited at said cathode.
US642025A 1932-06-29 1932-11-10 Electrodeposition of chromium Expired - Lifetime US2088615A (en)

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DE2088615X 1932-06-29

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415950A (en) * 1943-02-08 1947-02-18 Pittsburgh Plate Glass Co Chromium compound
US3419481A (en) * 1966-04-08 1968-12-31 Diamond Shamrock Corp Electrolyte and process for electroplating black chromium and article thereby produced
NL6901002A (en) * 1968-01-30 1969-08-01
US3620935A (en) * 1967-01-18 1971-11-16 Kewanee Oil Co Process of black chromium plating
FR2231770A1 (en) * 1973-05-31 1974-12-27 British Chrome Chemicals Ltd
FR2382521A1 (en) * 1977-03-04 1978-09-29 Int Lead Zinc Res TRIVALENT CHROME GALVANOPLASTY BATHS
US4161432A (en) * 1975-12-03 1979-07-17 International Business Machines Corporation Electroplating chromium and its alloys
US4417955A (en) * 1977-01-26 1983-11-29 International Business Machines Corporation Method of and solution for electroplating chromium and chromium alloys and method of making the solution
USRE31508E (en) 1974-12-11 1984-01-24 International Business Machines Corporation Electrodeposition of chromium
US4473448A (en) * 1981-02-09 1984-09-25 W. Canning Materials Limited Electrodeposition of chromium
EP2705176B1 (en) 2011-05-03 2016-04-13 ATOTECH Deutschland GmbH Electroplating bath and method for producing dark chromium layers

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415950A (en) * 1943-02-08 1947-02-18 Pittsburgh Plate Glass Co Chromium compound
US3419481A (en) * 1966-04-08 1968-12-31 Diamond Shamrock Corp Electrolyte and process for electroplating black chromium and article thereby produced
US3620935A (en) * 1967-01-18 1971-11-16 Kewanee Oil Co Process of black chromium plating
NL6901002A (en) * 1968-01-30 1969-08-01
FR2231770A1 (en) * 1973-05-31 1974-12-27 British Chrome Chemicals Ltd
USRE31508E (en) 1974-12-11 1984-01-24 International Business Machines Corporation Electrodeposition of chromium
US4161432A (en) * 1975-12-03 1979-07-17 International Business Machines Corporation Electroplating chromium and its alloys
US4417955A (en) * 1977-01-26 1983-11-29 International Business Machines Corporation Method of and solution for electroplating chromium and chromium alloys and method of making the solution
FR2382521A1 (en) * 1977-03-04 1978-09-29 Int Lead Zinc Res TRIVALENT CHROME GALVANOPLASTY BATHS
US4157945A (en) * 1977-03-04 1979-06-12 International Lead Zinc Research Organization, Inc. Trivalent chromium plating baths
US4473448A (en) * 1981-02-09 1984-09-25 W. Canning Materials Limited Electrodeposition of chromium
EP2705176B1 (en) 2011-05-03 2016-04-13 ATOTECH Deutschland GmbH Electroplating bath and method for producing dark chromium layers

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