ELECTRIC PRECIPITATION OF RUTHENIUM FROM PHOSPHATE ELECTROLYTES

The study of electrochemical behavior of ruthenium phosphate complexes (K-2[Ru2O . (H2PO4)(7)]. 8H(2)O) in solutions of phosphoric acid and phosphates made it possible to establish that high-quality ruthenium c oatings with high enough current efficiency are precipitated from solu tions containing 6-10 g . liter(-1) of ruthenium (referred to the meta l) at a total concentration of phosphate ions of about 2 M and pH = 0. 5-1.0. Rise in temperature increases the yield of the metal as functio n of current, and rise in the solution acidity displays a similar effe ct. An increase in current density is efficient up to a certain limit, and stirring has no effect on the rate of ruthenium precipitation.