No abstract

Vol. 94, Xo. 5 C()PPF, R EI,ECTIIODEI'OSITI()N 261 ciency is less but the tungsten content of the plates is greater; also these deposits show less tendency to tarnish.The amount of tungsten in the bath (28 g./1.) is not very critical. It can be decreased or increased somewhat without changing the characteristics of the bath appreciably.The amount of citric acid in the bath (66 g./1.) is about the best for the iron concentration used. The baths are quite stable and show no tendency to form a precipitate on standing for several months. If the amount of iron is increased very much it is necessary to increase the citric acid concentration in order to avoid the formation of a precipitate in the bath.This ammoniaeal citrate bath is suitable for the eleetrodeposition of irontungsten, nickel-tungsten, and cobalt-tungsten alloys. ABSTRACT The efficiency of copper deposition from copper cyanide solutions is improved by decreasing the total pressure on the bath; also an increase in total pressure results in decreasing efficiency. A simple mathematical relationship has been developed to relate the deposition efficiency of copper with the total pressure and current density. This study has been made on only one bath at a constant temperature of 50~ Possible applications of these results are discussed.' Manuscript