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Electrodeposition of Titanium Diboride Coatings.
Schlain-D; McCawley-FX; Smith-GR
NTIS: PB 257 384 :22 pages
This Bureau of Mines report describes a method for electrodepositing titanium diboride from a molten salt bath. Initially, the electrolyte is a mixture of libo2, nabo2, na2tio3, li2tio3, and tio2. The cell is operated at 900 deg c in a dry, inert atmosphere with consumable anodes of titanium or hot-pressed titanium diboride (tib2) powder. Agitation of the electrolyte is essential. Current densities may be 6 to 9 amperes per square decimeter (amp/dm2) with titanium anodes and 9 to 30 amp/dm2 with titanium diboride anodes. A current density of 6 amp/dm2 is equivalent to a plating rate of about 35 micrometers per hour. The adherence of the tib2 deposit varies with the substrate material. It is most adherent on molybdenum and on 4130 steel that has been preplated with copper and nickel, less adherent on nickel, and still less adherent on inconel and on 4130 steel without the preplate. Cathode and anode reactions are suggested.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 257 384