On Electrodeposition of Tungsten Alloys from Ammoniacal Tartrate Plating Bath

Abstract

The effect of ammonium salt, sulfate, potassium salt, and sodium salt on the electrodeposition of the tungsten alloys from tartrate and citrate plating bath was studied.The cathode current efficiency and the tungsten content of the deposits from sodium tartrate bath were similar to those of the deposition from sodium citrate bath.It was found that, with the addition of ammonium salt to the tartrate bath, the current efficiency was increased remarkably as compared with the results in the case of citrate bath, and the highest current efficiency was obtained at the molar ratio of the ammonium salt to the tartrate was 1:1.However, any effect of sulfate, potassium and sodium salts on the electrodeposition of tungsten alloys in the tartrate plating bath was not found.When the hydrazine sulfate was added to the tartrate bath, as in the case of ammonium salt addition, the current efficiency was increased remarkably as compared with those in citrate bath.