Report of Investigations 8656: Electromechanical Studies of Platinum-Group Metals in Molten Alkali Metal Cyanides

Details

• Personal Author:
  Flinn, David R. ; Manger, Cheryl L.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  The Bureau of Mines has studied the electrochemical parameters important to the preparation of coatings of the platinum-group metals. Using molten mixtures of sodium and potassium cyanides in an inert atmosphere, techniques have been developed that permit the preparation of baths for platinum, rhodium, and iridium electrodeposition. Cyclic voltametric and slow sweep rate linear polarization techniques have been utilized to determine optimum potential and current values for preparation of plating baths and for the electrodeposition of coatings. Techniques are described for the deposition of platinum and rhodium coatings at near 100 percent anode and cathode current efficiencies, and for iridium at approximately 80-percent efficiency. Palladium deposition from these molten cyanide baths remains unsatisfactory. The chemistry of the palladium-containing cyanide bath is discussed. Examples of scanning electron microscope photomicrographs of typical platinum coatings are presented. Techniques are described for the preparation of platinum coatings on large objects. [Description provided by NIOSH]
• Subjects:
  Cyanides Mining Occupational Health Platinum Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• ISSN:
  1066-5552 (print)
• Publisher:
  United States. Bureau of Mines
• Document Type:
  Text
• Genre:
  Case Report
• Rights:
  Public Domain
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  AVRC - Avondale Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  24 pdf pages
• NIOSHTIC Number:
  nn:10006360
• Federal Fiscal Year:
  1982
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:19d4d5af6a055dae6e5396d95ebd13eedf9cace6a57f7992a32078f887535ba734e486c159249b32ec9c243f6728b5b71d7dd4a51d6e10bcdd78dcd3481185ac
• Download URL:
  https://stacks.cdc.gov/view/cdc/201788/cdc_201788_DS1.pdf
• File Type:
  [PDF - 1.30 MB ]