Can we immerse the sample in an aerated solution in a cell, seal it, and then de-oxygenate it with a continuous flow of N2 for about 30 min during which a potentiostatic conditioning (at -2 V vs. SCE) is applied for the same period of time before starting the electrochemical corrosion experiment? Would not that make handling the de-oxygenated-solution experiment easier instead of opening the cell up (after de-oxygenating it) to immerse the sample instantaneously in?
Usually, de-oxygenate solution before sample immersion is preferred in order to avoid reactions between the sample surface and dissolved oxygen in solution.
If you want to use for first solution, you should take care of problems induced by the potentiostatic conditionning (hydrogen for example) which can affect the electrochemical response of your surface.
Firstly de-oxygenate the solution for long time depending on the solution volume. Continuous flow of N2 with a higher rate during the immersion of the sample.
It will be better de-oxygenate solution before sample immersion. To keep the potential at -2,0 V/ECS will become the pH very alkaline and it will modify the substrate surface.
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