In order to verify the effectiveness of the parameter S in evaluating electrode asymmetry, an experiment introducing deliberately asymmetrical electrodes was performed. An electrochemical cell with two cylindrical compartments connected by a porous glass frit (split cell) was used to enable the modification of the environment in one compartment without affecting the environment in the other compartment. As a result, the corrosion of one of the two electrodes can be significantly increased by, for example, alkalinization or acidification of the solution in its compartment. The two compartments were filled with 3.5% NaCl solution and one AA2024T3 electrode was immersed in each compartment.
The two electrodes were coupled by a 10 kX resistor, and the potential of each electrode with respect to a single saturated calomel electrode was acquired with a NI-USB 6009 analog-to-digital converter. The electrochemical noise signal was acquired with the procedure described above. Simultaneously with the electrochemical noise signal, images of the corroding surface were acquired at 150 s interval. After 4 h of immersion in 3.5% NaCl, 5 ml of 1 M
NaOH were introduced to one compartment of the cell, promoting increased corrosion in that compartment (electrode 2 in Fig. 10 and images a and c in Fig. 11). The video 2 in the additional material displays the time evolution of potential, current, noise resistance
In order to verify the effectiveness of the parameter S in evaluating electrode asymmetry, an experiment introducing deliberately asymmetrical electrodes was performed. An electrochemical cell with two cylindrical compartments connected by a porous glass frit (split cell) was used to enable the modification of the environment in one compartment without affecting the environment in the other compartment. As a result, the corrosion of one of the two electrodes can be significantly increased by, for example, alkalinization or acidification of the solution in its compartment. The two compartments were filled with 3.5% NaCl solution and one AA2024T3 electrode was immersed in each compartment.The two electrodes were coupled by a 10 kX resistor, and the potential of each electrode with respect to a single saturated calomel electrode was acquired with a NI-USB 6009 analog-to-digital converter. The electrochemical noise signal was acquired with the procedure described above. Simultaneously with the electrochemical noise signal, images of the corroding surface were acquired at 150 s interval. After 4 h of immersion in 3.5% NaCl, 5 ml of 1 MNaOH were introduced to one compartment of the cell, promoting increased corrosion in that compartment (electrode 2 in Fig. 10 and images a and c in Fig. 11). The video 2 in the additional material displays the time evolution of potential, current, noise resistance
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