Feasibility of Electroplating Platinum--Iridium Alloy out of Fused Chlorides.

摘要

The feasibility of plating platinum and platinum-iridium alloys out of molten chloride salts was tested. Electrolysis and cyclic voltammetry studies were made of the eutectic mixture of lithium chloride and potassium chloride with and without additions of potassium tetrachloroplatinite(II) (K sub 2PtCl sub 4 ) and potassium hexachloroiridite(III) (K sub 3 IrCl sub 6 ). Platinum was deposited at 100percent efficiency from melts containing it. The deposit was dendritic,coarsely crystalline,noncoherent,and nonadherent. Deposits from melts containing both platinum and iridium were pure platinum (the iridium did not deposit) and had the same undesirable form as those from the melts containing platinum only. The deposition potential for iridium was found to be about 100mV more negative than platinum. 6figures. (ERA citation 01:026035)