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The electrodeposition of tungsten in ZnCl 2 –NaCl–KCl–KF–WO 3 melt at 250°C was further studied to obtain a thicker deposit. In the ordinary electrolysis at 0.08V vs. Zn(II)/Zn, the current density decreased from 1.2mAcm −2 to 0.3mAcm −2 in 6h. A thickness of the obtained tungsten layer was 2.1μm and the estimated current efficiency was 93%. A supernatant salt and a...
WO 3 hardly dissolved in ZnCl 2 –NaCl–KCl (0.60:0.20:0.20, in mole fraction) melt at 250 °C. The solubility of WO 3 increased by the addition of KF to the melt, which enabled electrodeposition of metallic tungsten. A smooth and fine film of metallic tungsten was obtained on a nickel substrate by the potentiostatic electrolysis at 0.06 V versus Zn(II)/Zn. The thickness reached...
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