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Application to the Al-Cu Coupling

Metal 1 is copper (Fig. 11), and according to our knowledge of this system, the copper electrode is under cathodic polarization and the oxygen reduction reaction occurs. The current can then be [Pg.314]

The simulations were performed using the finite-element package FEMLAB with the conductive DC module in a two-dimensional axial symmetry. The mesh size was refined to obtain a numerical error lower than 0.1% evaluated from the net current of the system, which is the sum of the current passing through the copper and aluminum electrodes. At the corrosion potential this net current is zero. [Pg.315]

This suggests that local variations of the chemical composition of the electrolyte can occur from the beginning of immersion with a local alkalinization of the electrolyte at the aluminum/copper interface. Thus, the consequence is a particular evolution of the interface morphology of the disk electrode after immersion in the electrol5de related to corrosion phenomena restricted to the aluminum/copper interface. [Pg.317]

The sample consisted of a pure aluminum/pure copper couple. A cylinder of pure aluminum (99.999 wt%), provided by Alfa/Aesar, was drilled in its center and a cylinder of pure copper (99.9 wt%), provided by Goodfellow, was then introduced by force into the hole. The assembly of the two materials gave a perfectly joined interface avoiding any crevice corrosion due to surface defects. The diameters of the two cylinders were chosen to obtain an aluminum surface area to copper surface area ratio of 10 (external diameters were equal to 10 and 3.15 mm for the aluminum and copper bars, respectively). The electrode was then embedded in an epoxy resin so that a disk electrode was obtained at the extremity. Before immersion in the electrolyte, the disk electrode was mechanically polished with SiC papers up to 4,000 grade, ultrasonically cleaned with ethanol, then with distilled water. The electrolyte was a 10 MNa2SO4 solution prepared with analytical-grade chemicals in contact with an air atmosphere and at room temperature. [Pg.318]


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