Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Structure and Porosity of Electrodeposited Platinum: Evaluation of Four Plating Methods.

Authors
Lynch-MJ; Walters-RP; Flinn-DR
Source
MISSING :18 pages
Link
NIOSHTIC No.
10003225
Abstract
The Bureau of Mines evaluated the feasibility of substituting platinum-coated metals for bulk platinum shapes as a means for conserving platinum. Platinum coatings were prepared using four different methods of electrodeposition, then tested and evaluated. In order for platinum coatings to be useful in process environments, they must be thick, adherent, stress-free, and pore-free. The Bureau evaluated direct-current, current reversal, cathode shielding, and pulsed-current plating techniques for producing a pore-free platinum electrodeposit from a molten cyanide bath. Aqueous corrosion tests of fe-10cr substrates coated with approximately 25 um of platinum showed that pulse plating yielded the most corrosion-resistant and, hence, the most pore-free coatings. The morphology of coating cross sections was in all cases columnar. The average grain size of pulse-plated deposits was independent of thickness, while all other plating techniques produced grains that increased in size as the coatings became thicker. It is believed that the constant grain size in the pulse- plated deposits resulted from better mass transport during the electrodeposition.
Publication Date
19830101
Document Type
IH; Report of Investigations
Fiscal Year
1983
NTIS Accession No.
NTIS Price
Identifying No.
RI 8829
NIOSH Division
AVRC;
Source Name
MISSING
TOP