Classifications

• • 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
  • C25D3/56—Electroplating: Baths therefor from solutions of alloys
  • C25D3/565—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of zinc
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B15/00—Peroxides; Peroxyhydrates; Peroxyacids or salts thereof; Superoxides; Ozonides
  • C01B15/055—Peroxyhydrates; Peroxyacids or salts thereof
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
  • C01G25/00—Compounds of zirconium
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
  • C01G25/00—Compounds of zirconium
  • C01G25/02—Oxides
• • 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
  • C25D3/22—Electroplating: Baths therefor from solutions of zinc
  • C25D3/24—Electroplating: Baths therefor from solutions of zinc from cyanide baths
• • 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
  • C25D3/26—Electroplating: Baths therefor from solutions of cadmium
  • C25D3/28—Electroplating: Baths therefor from solutions of cadmium from cyanide baths
• • 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
  • C25D3/56—Electroplating: Baths therefor from solutions of alloys

Definitions

• the main object of the invention is to provide a novel process for the production of titanium and zirconium compound, especially adapted to add to the coating bath in the above proposed coating process.
• Tetrahyroxide of titanium or zirconium can be obtained, when a solution of tetravalent salts of titanium or zirconium, such as, for instance, titanium tetrafluoride, zirconium tetrafluoride or the like, is subjected to a hydrol ysis in the presence of an alkali.
• the thus obtained tetrahydroxides are variable in their chamical and physical properties, depending upon the temperature and other conditions during the hydrolysis to a substantial degree.
• the fluorides, chlorides, sulphates and the like are preferably used as the above mentioned tetravalent salts of titanium or zirconium, while salts of weak acids are liable to be subjected to hydrolysis and thus to form an unwanted titanium or zirconium compounds such as oxy-compounds.
• solutions of tetravalent compounds of titanium or zirconium, if diluted, are susceptible to hydrolysis. It is thus preferable in the present process to employ concentrations of these solutions lying in the neighborhood of the saturation point.
• the hydrolysis of tetravalent titanium and zirconium salt is carried out at a temperature lower than 10 C.
• the temperature of the hydrolyte increases substantially and if the reaction temperature should become higher than 10 C., the produced hydroxides would provide such chemically inactive acids as meta-titanic acid or meta-zirconic acid, which adversely affects the production of the desired stable addition compounds with hydrogen peroxide.
• the hydrolysis is carried out under suflicient cooling to produce highly reactive hydroxides or ortho-titanic or ortho-zirconic acid, thus capable of producing stable addition compounds with hydrogen peroxide.
• hydroxides are brought into reaction with the equivalent quantity of hydrogen peroxide, a paste-like substance consisting of titanium or zirconium hydroxide-hydrogen peroxide addition compound is formed, as the case may be.
• the above mentioned additional compounds dissolve in an alkaline solution to form the peroxide of sodium pertitanate or perziconate, as the case may be.
• the addition compounds are not only highly stable and persist for long intervals, but also dissolve stably in an alkaline coating bath containing cadmium or zinc, from which the desired alloy coating containing titanium or zirconium can be produced in the conventional way.
• Example 1 A saturated aqueous solution of titanium tetrafluoride was ice-cooled and kept at a temperature lower than 5 C. An equivalent quantity of caustic soda was added and the resulting mixture was permitted to hydrolyze. The thus produced precipitate was then filtered and mixed with an equivalent quantity of hydrogen peroxide (of 35% concentration) containing 5% of sodium pyrophosphate, thus forming titanium hydroxide-hydrogen peroxide addition compound, which is highly stable. This addition compound was then dissolved in a conventional cyanate bath containing cadmium or zinc, therefrom a titantium alloy coating was produced in the conventional way.
• Example 2 A saturated aqueous solution of zirconium tetrachloride was ice-cooled and kept at 3 C, and then subjected to hydrolysis in the presence of ammonia and centrifuged. The thus separated precipitate is reacted with an equivalent quantity of hydrogen peroxide (of 35% concentration) containing 3% of sodium pyrophosphate, thus forming zirconium hydroxide-hydrogen peroxide addition compound.
• This compound together with the titanium additional compound obtained in Example 1 was dissolved in a conventional zinc cyanide and subjected to an electrolysis, thus obtaining a ternary alloy coating containing zinc, titanium and zirconium.
• Process for the production of titanium and zirconium addition products particularly suited to be added to a plating bath containing a cyanide selected from the group consisting of cadmium cyanide and zinc cyanide comprising: preparing a substantially saturated aqueous solution of a salt of a tetravalent metal selected from the group consisting of titanium and zirconium, said salt being selected from the group consisting of the fluorides, chlorides and sulfates of said tetravalent metal; adding an alkali selected from the group consisting of alkali metal hydroxides and ammonium hydroxide to said aqueous salt solution while maintaining the solution and resulting products at a temperature below 10 C.; physically separating the thereby produced precipitated hydroxide from the remaining liquid; then reacting said hydroxide with a chemically equivalent quantity of hydrogen peroxide in the presence of between 1% and 5% by weight of sodium pyrophosphate based on the hydrogen peroxide; and recovering the metal hydroxide-hydrogen peroxid
• Schurnb et aL Hydrogen Peroxide, Reinhold Publish- References Clted the file of this Patent ing Corporation, New York, No. 128, pages 540 and UNITED STATES PATENTS 10 541 (-1955).
• Blumenthal The Chemical Behavior of Zirconium, 1,624,162 Boer P 1927 D. Van Nostrand Co., 111e,, New York, 1958, pages 198- 2,1'41,1s9 Lind Dec.27,1938 2m

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Materials Engineering (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Metallurgy (AREA)
• Inorganic Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Toxicology (AREA)
• Inorganic Compounds Of Heavy Metals (AREA)
• Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
• Electroplating And Plating Baths Therefor (AREA)

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Citations (4)

• 1961
  • 1961-03-06 US US93326A patent/US3139325A/en not_active Expired - Lifetime
  • 1961-08-12 DE DET20619A patent/DE1253987B/de active Pending
  • 1961-08-18 GB GB29944/61A patent/GB954089A/en not_active Expired
  • 1961-09-01 CH CH1020161A patent/CH427757A/de unknown

Patent Citations (4)

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