OCCLUSION OF VARIOUS REFRACTORY MATERIALS IN CHROMIUM PLATE ON STEEL SUBSTRATES.
SPRINGFIELD ARMORY MASS
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Falex test pins plated at moderate current densities from standard chromium baths containing dispersoids of diamond dust, zirconia or thoria at volume concentrations of about 1 per cent do not exhibit unusual wear characteristics. Falex test pins plated under similar conditions at high current densities show higher hardness and correspondingly improved wear resistance. The particle weights occluded in chromium plate deposited at high current densities amount to about 1 per cent - an order of magnitude improvement over that achieved at conventional current densities and bath concentrations of dispersoid amounting to approximately 1 per cent. Photomicrographs of both dispersed thoria and zirconia particles are included. Procedure is described and results are discussed. Author