Mizushima, Io1; Tang, Peter Torben1; Hansen, Hans Nørgaard2; Somers, M.A.J.3
1 Department of Management Engineering, Technical University of Denmark2 Department of Mechanical Engineering, Technical University of Denmark3 unknown
In the present work, the effect of the complexing agents citrate, glycine and triethanolamine (TEA) on the electrodeposition of Ni-W layers from electrolytes based on NiSO4 and Na2WO4, is investigated. The investigations include measurement of the current efficiencies, determination of the tungsten content in the electrodeposits (by energy dispersive X-ray analysis), voltammetry studies and characterization of complex formation by UV-spectrometry. High W content and current efficiency could be realized by using electrolytes containing all of the three complexing agents. The results show that small amounts of glycine in a citrate-triethanolamine based electrolyte positively influences both the mass-transfer and the deposition potential.
Electrochimica Acta, 2005, Vol 51, Issue 5, p. 888-896