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The redox reactions in KCl-NaCl-NaF-K 2 TiF 6 melts reduced by titanium metal have been studied by cyclic voltammetry and chronopotentiommetry. At platinum and nickel electrodes waves due to alloy formation were seen preceding the Ti(III) → Ti metal deposition wave. The presence of oxide species could be detected as waves on voltammograms performed with platinum electrodes. Deposits on nickel plates in general consisted of multiphase Ni-Ti layers. By varying the deposition potential outer layers with compositions ranging from pure titanium over NiTi to nickel-rich alloys such as Ni 3 Ti could be obtained. Pulse plating produced the best titanium coating. With constant potential electrolyses it was also possible to deposit titanium diboride coatings of high quality from the mixed chloride-fluoride melts.

Influence of Oxide and Alloy Formation on the Electrochemistry of Ti Deposition from the NaCl-KCl-NaF-K[sub 2]TiF[sub 6] Melt Reduced by Metallic Ti