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ear polarization and electrochemical impedance
spectroscopymeasurements.
2. Experimental procedure
2.1. Materials
Pure aluminum (99.99%) and 316L stainless steel (18-Cr, 10-Ni,
3-Mo, Fe-bal), both obtained from Goodfellow MaterialsLtd, were
used. The materials were obtained in rods of 6 mmin diameter (cross
sectional area: 0.28 cm 2 ). The ethoxidewas prepared using reagent
grade ethanol anhydrous (EtOH)and potassium hydroxide (KOH).
2.2. Electrochemical measurements
The electrochemical measurements were performed with
apotentiostate-galvanostate (Gamry PC14-300 Instruments,
F IGURE 1. Polarization curves for 316L stainless steel
immersedin ethanol at different KOH concentrations.
F IGURE 2. Polarization curves for pure aluminum immersed
inethanol at different KOH concentrations.
Inc. USA) in a typical cell of three electrodes, using a
plat-inum wire as the auxiliary electrode and an Ag/AgCl wire asthe
reference electrode. Aluminum and stainless steel wereused as the
working electrodes. The metallic samples weremounted in epoxy resin
with an exposed cross section. Be-fore each experiment, the exposed
surface was polished andcleaned with deionized water, degreased
with acetone and
F IGURE 3. Comparison of Nyquist plots for 316L stainless
steelimmersed in ethanol solutions at various KOH concentrations
(0.5and 1 M).
F IGURE 4. Comparison of Nyquist plots for pure aluminum
im-mersed in ethanol solutions at various KOH concentrations
(0.25,0.5 and 1 M).
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