Utilizing Inorganic Fluorine-containing Bath Patents (Class 205/286)
  • Patent number: 10100423
    Abstract: A layer of chromium metal is electroplated from trivalent chromium onto an electrically conducting substrate by immersing the substrate and a counter electrode in a electroplating bath and passing a modulated electric current between the electrodes. In one embodiment, the current contains pulses that are cathodic with respect to said substrate and in another embodiment the current contains pulses that are cathodic and pulses that are anodic with respect to said substrate. The cathodic pulses have a duty cycle greater than about 80%.
    Type: Grant
    Filed: August 14, 2015
    Date of Patent: October 16, 2018
    Inventors: Timothy D. Hall, Burhanuddin Kagajwala
  • Patent number: 8282808
    Abstract: The present invention relates to the use of phosphinic acids and/or phosphonic acids and salts thereof, preferably as surface-active compounds, in redox processes, in particular in electroplating technology, particularly preferably in electroplating baths, and to electroplating baths comprising these compounds.
    Type: Grant
    Filed: May 4, 2007
    Date of Patent: October 9, 2012
    Assignee: Merck Patent GmbH
    Inventors: Wolfgang Hierse, Nikolai Ignatyev
  • Publication number: 20030234183
    Abstract: In a process of electroplating a metal work piece with thin dense chromium, the steps of submerging the metal work piece in a 35% sulfuric acid solution having about 4 ounces per gallon HF as ammonium biflouride salts, and subsequently submerging the metal work piece in a thin dense chromium plating bath having an initial direct current of about 3 volts, the amperages being at about 1.5-2.5 amps per square inch of cathode area, is provided.
    Type: Application
    Filed: May 12, 2003
    Publication date: December 25, 2003
    Applicant: Noble Medical Coatings, LLC
    Inventors: Harry E. Corl, Lawrence E. Noble
  • Patent number: 6287446
    Abstract: The invention relates to metallic products and a process for producing these which allows, despite the complexity of their structure, for them to be produced in refractory alloys based on chromium. The chromium is deposited by electrolysis, this being carried out by means of a bath with high throwing power. The formation of the alloy with layers of other metallic constituents is obtained by thermal diffusion. The provision of aluminum is controlled in the form of particles by immersing, by spraying or “painting.” The structures according to the invention are particularly intended to be used as catalyst supports or filtering agents.
    Type: Grant
    Filed: June 15, 1999
    Date of Patent: September 11, 2001
    Assignee: S.C.P.S. Societe de Coneil et de Prospective Scientifique S.A.
    Inventors: Bernard Bugnet, Denis Doniat, Robert Rouget
  • Patent number: 6197183
    Abstract: This invention relates to the electrodeposition of chromium onto zinc or zinc alloys, and particular electrodeposition bath conditions. The chromium plating bath is suitable for enhancing surface hardness of relatively high copper, low aluminum zinc-alloys. The bath is an aqueous solution which includes chromic acid and sulfate ions in amounts so that the weight ratio of chromic acid to the sulfate ions is about 75:1 to about 125:1, respectively. The bath further includes specified amounts of fluoride ion, boric acid and an alkali metal carbonate. The bath may additionally include an alkali metal bicarbonate in a carbonate-to-bicarbonate weight ratio of about 0.6 to about 13:1, respectively.
    Type: Grant
    Filed: February 18, 2000
    Date of Patent: March 6, 2001
    Inventor: Richard C. Iosso
  • Patent number: 5259937
    Abstract: A colorless chromate coating film is formed on a bright aluminum wheel by subjecting the surface of an aluminum wheel to a cathodic electrolytic treatment in an acidic aqueous solution containing not less than 2 g/l of hexavalent chromium ions, 20 to 2,000 ppm of sulfate ions, 10 to 400 ppm of fluorine (F) as fluoride and not less than 20 ppm of zirconium ions at a pH of 0.6 to 1.7 at a current density of 0.5 to 15 A/dm.sup.2 for at least 30 seconds, thereby forming a coating film with a chromium coating amount of 50 to 250 mg/m.sup.2.
    Type: Grant
    Filed: December 16, 1992
    Date of Patent: November 9, 1993
    Assignees: Nihon Parkerizing Co. Ltd., Nissan Motor Co., Ltd.
    Inventors: Norifumi Hatano, Akihiko Hasebe, Kazuyuki Oyama, Katsuya Yamamoto