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Methods for Producing Platinum-group Metal Coatings from Molten Alkali Cyanides.

Authors
Walters-RP; Flinn-DR
Source
MISSING :17 pages
Link
NIOSHTIC No.
10003862
Abstract
This Bureau of Mines report reviews and assesses the technology for preparing electrodeposited coatings of the platinum-group metals from molten alkali metal cyanide baths. Methods are described for the preparation and purification of the cyanide electrolyte. Vacuum drying, fusion, and purity of the cyanide salts are discussed. Use of a sodium borosilicate test tube as a sodium-ion-conducting membrane for the addition of the desired platinum-group metal is described. The optimum plating parameters of potential and current density for pt, pd, rh, ru, and ir coatings that result in the best deposits are given. A method for producing platinum-rhodium alloy coatings of predetermined composition is also described. The importance of careful substrate surface preparation is illustrated. While problems still remain with respect to coating porosity, careful application of the methods described permits the preparation of adherent, coherent electrodeposited coatings of the platinum- group metals.
Publication Date
19840101
Document Type
IH; Information Circular;
Fiscal Year
1984
NTIS Accession No.
NTIS Price
Identifying No.
IC 8974
NIOSH Division
AVRC;
Source Name
MISSING
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