The Aluminum Electrode in AlCl 3

Passivation Phenomena have been observed upon cathodic and anodic polarization of the Al electrode in AlC 13-KCl-NaC1 melts between 100 and 160 °C. They are caused by formation of a solid salt layer at the electrode surface resulting from concentration changes upon current flow. The anodic limiting currents increased with temperature and with decreasing AlCl content of the melt. Current voltage curves obtained on a rotating aluminum disk showed a linear -1/2 relationship between the anodic limiting current and w 1/2. Upon cathodic polarization dentrite formation occurs at the Al electrode. The activation overvoltage in AlCl3 -KCl-NaCl (57.5-12.5-20 mol%) was determined by galvanostatic current step methods. An apparent 2 exchange current density of 270 mA/cm at 130 °C and a double layer 2 capacity of 40 ± I0Op F/cm were measured. (NASA-CR-126727) THE ALUMIINUM ELECTRODE IN N72-25153 A1C13-ALKALI-HALIDE MELTS G.L. Holleck, et al (Tyco Labs., Inc,) [1972] 2C p CSCL 11F Unclas G3/06 15420 L9gjZ VA PiO!J6u!Jds DJQwwoU D o luelw4Jodea S n 3D1IA3S NOIlVW8O4NI 1VDINHD31 lVNOIIVN Aq pe9npoJded S0)rt,6 https://ntrs.nasa.gov/search.jsp?R=19720017503 2018-03-26T20:49:25+00:00Z